Copyright	(c) 2011-2015 diagrams-lib team (see LICENSE)
License	BSD-style (see LICENSE)
Maintainer	diagrams-discuss@googlegroups.com
Safe Haskell	Safe-Inferred
Language	Haskell2010

Diagrams.Prelude

Contents

Diagrams library
Convenience re-exports from other packages

Description

A module to re-export most of the functionality of the diagrams core and standard library.

Synopsis

module Diagrams
module Data.Default.Class
alphaChannel :: AlphaColour a -> a
blend :: (Num a, AffineSpace f) => a -> f a -> f a -> f a
withOpacity :: Num a => Colour a -> a -> AlphaColour a
dissolve :: Num a => a -> AlphaColour a -> AlphaColour a
opaque :: Num a => Colour a -> AlphaColour a
alphaColourConvert :: (Fractional b, Real a) => AlphaColour a -> AlphaColour b
transparent :: Num a => AlphaColour a
black :: Num a => Colour a
colourConvert :: (Fractional b, Real a) => Colour a -> Colour b
data Colour a
data AlphaColour a
class ColourOps (f :: Type -> Type) where
- darken :: Num a => a -> f a -> f a
yellowgreen :: (Ord a, Floating a) => Colour a
yellow :: (Ord a, Floating a) => Colour a
whitesmoke :: (Ord a, Floating a) => Colour a
white :: (Ord a, Floating a) => Colour a
wheat :: (Ord a, Floating a) => Colour a
violet :: (Ord a, Floating a) => Colour a
turquoise :: (Ord a, Floating a) => Colour a
tomato :: (Ord a, Floating a) => Colour a
thistle :: (Ord a, Floating a) => Colour a
teal :: (Ord a, Floating a) => Colour a
steelblue :: (Ord a, Floating a) => Colour a
springgreen :: (Ord a, Floating a) => Colour a
snow :: (Ord a, Floating a) => Colour a
slategrey :: (Ord a, Floating a) => Colour a
slategray :: (Ord a, Floating a) => Colour a
slateblue :: (Ord a, Floating a) => Colour a
skyblue :: (Ord a, Floating a) => Colour a
silver :: (Ord a, Floating a) => Colour a
sienna :: (Ord a, Floating a) => Colour a
seashell :: (Ord a, Floating a) => Colour a
seagreen :: (Ord a, Floating a) => Colour a
sandybrown :: (Ord a, Floating a) => Colour a
salmon :: (Ord a, Floating a) => Colour a
saddlebrown :: (Ord a, Floating a) => Colour a
royalblue :: (Ord a, Floating a) => Colour a
rosybrown :: (Ord a, Floating a) => Colour a
red :: (Ord a, Floating a) => Colour a
purple :: (Ord a, Floating a) => Colour a
powderblue :: (Ord a, Floating a) => Colour a
plum :: (Ord a, Floating a) => Colour a
pink :: (Ord a, Floating a) => Colour a
peru :: (Ord a, Floating a) => Colour a
peachpuff :: (Ord a, Floating a) => Colour a
papayawhip :: (Ord a, Floating a) => Colour a
palevioletred :: (Ord a, Floating a) => Colour a
paleturquoise :: (Ord a, Floating a) => Colour a
palegreen :: (Ord a, Floating a) => Colour a
palegoldenrod :: (Ord a, Floating a) => Colour a
orchid :: (Ord a, Floating a) => Colour a
orangered :: (Ord a, Floating a) => Colour a
orange :: (Ord a, Floating a) => Colour a
olivedrab :: (Ord a, Floating a) => Colour a
olive :: (Ord a, Floating a) => Colour a
oldlace :: (Ord a, Floating a) => Colour a
navy :: (Ord a, Floating a) => Colour a
navajowhite :: (Ord a, Floating a) => Colour a
moccasin :: (Ord a, Floating a) => Colour a
mistyrose :: (Ord a, Floating a) => Colour a
mintcream :: (Ord a, Floating a) => Colour a
midnightblue :: (Ord a, Floating a) => Colour a
mediumvioletred :: (Ord a, Floating a) => Colour a
mediumturquoise :: (Ord a, Floating a) => Colour a
mediumspringgreen :: (Ord a, Floating a) => Colour a
mediumslateblue :: (Ord a, Floating a) => Colour a
mediumseagreen :: (Ord a, Floating a) => Colour a
mediumpurple :: (Ord a, Floating a) => Colour a
mediumorchid :: (Ord a, Floating a) => Colour a
mediumblue :: (Ord a, Floating a) => Colour a
mediumaquamarine :: (Ord a, Floating a) => Colour a
maroon :: (Ord a, Floating a) => Colour a
magenta :: (Ord a, Floating a) => Colour a
linen :: (Ord a, Floating a) => Colour a
limegreen :: (Ord a, Floating a) => Colour a
lime :: (Ord a, Floating a) => Colour a
lightyellow :: (Ord a, Floating a) => Colour a
lightsteelblue :: (Ord a, Floating a) => Colour a
lightslategrey :: (Ord a, Floating a) => Colour a
lightslategray :: (Ord a, Floating a) => Colour a
lightskyblue :: (Ord a, Floating a) => Colour a
lightseagreen :: (Ord a, Floating a) => Colour a
lightsalmon :: (Ord a, Floating a) => Colour a
lightpink :: (Ord a, Floating a) => Colour a
lightgrey :: (Ord a, Floating a) => Colour a
lightgreen :: (Ord a, Floating a) => Colour a
lightgray :: (Ord a, Floating a) => Colour a
lightgoldenrodyellow :: (Ord a, Floating a) => Colour a
lightcyan :: (Ord a, Floating a) => Colour a
lightcoral :: (Ord a, Floating a) => Colour a
lightblue :: (Ord a, Floating a) => Colour a
lemonchiffon :: (Ord a, Floating a) => Colour a
lawngreen :: (Ord a, Floating a) => Colour a
lavenderblush :: (Ord a, Floating a) => Colour a
lavender :: (Ord a, Floating a) => Colour a
khaki :: (Ord a, Floating a) => Colour a
ivory :: (Ord a, Floating a) => Colour a
indigo :: (Ord a, Floating a) => Colour a
indianred :: (Ord a, Floating a) => Colour a
hotpink :: (Ord a, Floating a) => Colour a
honeydew :: (Ord a, Floating a) => Colour a
greenyellow :: (Ord a, Floating a) => Colour a
green :: (Ord a, Floating a) => Colour a
grey :: (Ord a, Floating a) => Colour a
gray :: (Ord a, Floating a) => Colour a
goldenrod :: (Ord a, Floating a) => Colour a
gold :: (Ord a, Floating a) => Colour a
ghostwhite :: (Ord a, Floating a) => Colour a
gainsboro :: (Ord a, Floating a) => Colour a
fuchsia :: (Ord a, Floating a) => Colour a
forestgreen :: (Ord a, Floating a) => Colour a
floralwhite :: (Ord a, Floating a) => Colour a
firebrick :: (Ord a, Floating a) => Colour a
dodgerblue :: (Ord a, Floating a) => Colour a
dimgrey :: (Ord a, Floating a) => Colour a
dimgray :: (Ord a, Floating a) => Colour a
deepskyblue :: (Ord a, Floating a) => Colour a
deeppink :: (Ord a, Floating a) => Colour a
darkviolet :: (Ord a, Floating a) => Colour a
darkturquoise :: (Ord a, Floating a) => Colour a
darkslategrey :: (Ord a, Floating a) => Colour a
darkslategray :: (Ord a, Floating a) => Colour a
darkslateblue :: (Ord a, Floating a) => Colour a
darkseagreen :: (Ord a, Floating a) => Colour a
darksalmon :: (Ord a, Floating a) => Colour a
darkred :: (Ord a, Floating a) => Colour a
darkorchid :: (Ord a, Floating a) => Colour a
darkorange :: (Ord a, Floating a) => Colour a
darkolivegreen :: (Ord a, Floating a) => Colour a
darkmagenta :: (Ord a, Floating a) => Colour a
darkkhaki :: (Ord a, Floating a) => Colour a
darkgrey :: (Ord a, Floating a) => Colour a
darkgreen :: (Ord a, Floating a) => Colour a
darkgray :: (Ord a, Floating a) => Colour a
darkgoldenrod :: (Ord a, Floating a) => Colour a
darkcyan :: (Ord a, Floating a) => Colour a
darkblue :: (Ord a, Floating a) => Colour a
cyan :: (Ord a, Floating a) => Colour a
crimson :: (Ord a, Floating a) => Colour a
cornsilk :: (Ord a, Floating a) => Colour a
cornflowerblue :: (Ord a, Floating a) => Colour a
coral :: (Ord a, Floating a) => Colour a
chocolate :: (Ord a, Floating a) => Colour a
chartreuse :: (Ord a, Floating a) => Colour a
cadetblue :: (Ord a, Floating a) => Colour a
burlywood :: (Ord a, Floating a) => Colour a
brown :: (Ord a, Floating a) => Colour a
blueviolet :: (Ord a, Floating a) => Colour a
blue :: (Ord a, Floating a) => Colour a
blanchedalmond :: (Ord a, Floating a) => Colour a
bisque :: (Ord a, Floating a) => Colour a
beige :: (Ord a, Floating a) => Colour a
azure :: (Ord a, Floating a) => Colour a
aquamarine :: (Ord a, Floating a) => Colour a
aqua :: (Ord a, Floating a) => Colour a
antiquewhite :: (Ord a, Floating a) => Colour a
aliceblue :: (Ord a, Floating a) => Colour a
readColourName :: (MonadFail m, Monad m, Ord a, Floating a) => String -> m (Colour a)
black :: Num a => Colour a
module Data.Colour.SRGB
module Data.Semigroup
module Linear.Vector
module Linear.Affine
module Linear.Metric
module Data.Active
class (Functor t, Foldable t) => Traversable (t :: Type -> Type) where
- traverse :: Applicative f => (a -> f b) -> t a -> f (t b)
class Contravariant (f :: Type -> Type) where
- contramap :: (a' -> a) -> f a -> f a'
- (>$) :: b -> f b -> f a
class Bifunctor (p :: Type -> Type -> Type) where
- bimap :: (a -> b) -> (c -> d) -> p a c -> p b d
newtype Identity a = Identity {
- runIdentity :: a
}
newtype Const a (b :: k) = Const {
- getConst :: a
}
data (a :: k) :~: (b :: k) where
- Refl :: forall {k} (a :: k). a :~: a
(&) :: a -> (a -> b) -> b
(<&>) :: Functor f => f a -> (a -> b) -> f b
itoList :: FoldableWithIndex i f => f a -> [(i, a)]
ifoldlM :: (FoldableWithIndex i f, Monad m) => (i -> b -> a -> m b) -> b -> f a -> m b
ifoldrM :: (FoldableWithIndex i f, Monad m) => (i -> a -> b -> m b) -> b -> f a -> m b
ifind :: FoldableWithIndex i f => (i -> a -> Bool) -> f a -> Maybe (i, a)
iconcatMap :: FoldableWithIndex i f => (i -> a -> [b]) -> f a -> [b]
iforM_ :: (FoldableWithIndex i t, Monad m) => t a -> (i -> a -> m b) -> m ()
imapM_ :: (FoldableWithIndex i t, Monad m) => (i -> a -> m b) -> t a -> m ()
ifor_ :: (FoldableWithIndex i t, Applicative f) => t a -> (i -> a -> f b) -> f ()
itraverse_ :: (FoldableWithIndex i t, Applicative f) => (i -> a -> f b) -> t a -> f ()
inone :: FoldableWithIndex i f => (i -> a -> Bool) -> f a -> Bool
iall :: FoldableWithIndex i f => (i -> a -> Bool) -> f a -> Bool
iany :: FoldableWithIndex i f => (i -> a -> Bool) -> f a -> Bool
imapAccumL :: TraversableWithIndex i t => (i -> s -> a -> (s, b)) -> s -> t a -> (s, t b)
imapAccumR :: TraversableWithIndex i t => (i -> s -> a -> (s, b)) -> s -> t a -> (s, t b)
iforM :: (TraversableWithIndex i t, Monad m) => t a -> (i -> a -> m b) -> m (t b)
imapM :: (TraversableWithIndex i t, Monad m) => (i -> a -> m b) -> t a -> m (t b)
ifor :: (TraversableWithIndex i t, Applicative f) => t a -> (i -> a -> f b) -> f (t b)
class Functor f => FunctorWithIndex i (f :: Type -> Type) | f -> i where
- imap :: (i -> a -> b) -> f a -> f b
class Foldable f => FoldableWithIndex i (f :: Type -> Type) | f -> i where
- ifoldMap :: Monoid m => (i -> a -> m) -> f a -> m
- ifoldMap' :: Monoid m => (i -> a -> m) -> f a -> m
- ifoldr :: (i -> a -> b -> b) -> b -> f a -> b
- ifoldl :: (i -> b -> a -> b) -> b -> f a -> b
- ifoldr' :: (i -> a -> b -> b) -> b -> f a -> b
- ifoldl' :: (i -> b -> a -> b) -> b -> f a -> b
class (FunctorWithIndex i t, FoldableWithIndex i t, Traversable t) => TraversableWithIndex i (t :: Type -> Type) | t -> i where
- itraverse :: Applicative f => (i -> a -> f b) -> t a -> f (t b)
class Profunctor (p :: Type -> Type -> Type) where
- dimap :: (a -> b) -> (c -> d) -> p b c -> p a d
- lmap :: (a -> b) -> p b c -> p a c
- rmap :: (b -> c) -> p a b -> p a c
defaultFieldRules :: LensRules
makeFieldsNoPrefix :: Name -> DecsQ
makeFields :: Name -> DecsQ
abbreviatedNamer :: FieldNamer
abbreviatedFields :: LensRules
classUnderscoreNoPrefixNamer :: FieldNamer
classUnderscoreNoPrefixFields :: LensRules
camelCaseNamer :: FieldNamer
camelCaseFields :: LensRules
underscoreNamer :: FieldNamer
underscoreFields :: LensRules
makeWrapped :: Name -> DecsQ
declareLensesWith :: LensRules -> DecsQ -> DecsQ
declareFields :: DecsQ -> DecsQ
declareWrapped :: DecsQ -> DecsQ
declarePrisms :: DecsQ -> DecsQ
declareClassyFor :: [(String, (String, String))] -> [(String, String)] -> DecsQ -> DecsQ
declareClassy :: DecsQ -> DecsQ
declareLensesFor :: [(String, String)] -> DecsQ -> DecsQ
declareLenses :: DecsQ -> DecsQ
makeLensesWith :: LensRules -> Name -> DecsQ
makeClassyFor :: String -> String -> [(String, String)] -> Name -> DecsQ
makeLensesFor :: [(String, String)] -> Name -> DecsQ
makeClassy_ :: Name -> DecsQ
makeClassy :: Name -> DecsQ
makeLenses :: Name -> DecsQ
classyRules_ :: LensRules
classyRules :: LensRules
mappingNamer :: (String -> [String]) -> FieldNamer
lookingupNamer :: [(String, String)] -> FieldNamer
lensRulesFor :: [(String, String)] -> LensRules
underscoreNoPrefixNamer :: FieldNamer
lensRules :: LensRules
lensClass :: Lens' LensRules ClassyNamer
lensField :: Lens' LensRules FieldNamer
createClass :: Lens' LensRules Bool
generateLazyPatterns :: Lens' LensRules Bool
generateUpdateableOptics :: Lens' LensRules Bool
generateSignatures :: Lens' LensRules Bool
simpleLenses :: Lens' LensRules Bool
data LensRules
type FieldNamer = Name -> [Name] -> Name -> [DefName]
data DefName
- = TopName Name
- | MethodName Name Name
type ClassyNamer = Name -> Maybe (Name, Name)
makeClassyPrisms :: Name -> DecsQ
makePrisms :: Name -> DecsQ
iat :: At m => Index m -> IndexedLens' (Index m) m (Maybe (IxValue m))
sans :: At m => Index m -> m -> m
ixAt :: At m => Index m -> Traversal' m (IxValue m)
iix :: Ixed m => Index m -> IndexedTraversal' (Index m) m (IxValue m)
icontains :: Contains m => Index m -> IndexedLens' (Index m) m Bool
type family Index s
class Contains m
type family IxValue m
class Ixed m where
- ix :: Index m -> Traversal' m (IxValue m)
class Ixed m => At m
class Each s t a b | s -> a, t -> b, s b -> t, t a -> s where
- each :: Traversal s t a b
gplate1 :: forall {k} (f :: k -> Type) (a :: k). (Generic1 f, GPlated1 f (Rep1 f)) => Traversal' (f a) (f a)
gplate :: (Generic a, GPlated a (Rep a)) => Traversal' a a
parts :: Plated a => Lens' a [a]
composOpFold :: Plated a => b -> (b -> b -> b) -> (a -> b) -> a -> b
para :: Plated a => (a -> [r] -> r) -> a -> r
paraOf :: Getting (Endo [a]) a a -> (a -> [r] -> r) -> a -> r
holesOnOf :: Conjoined p => LensLike (Bazaar p r r) s t a b -> Over p (Bazaar p r r) a b r r -> s -> [Pretext p r r t]
holesOn :: Conjoined p => Over p (Bazaar p a a) s t a a -> s -> [Pretext p a a t]
holes :: Plated a => a -> [Pretext (->) a a a]
contextsOnOf :: ATraversal s t a a -> ATraversal' a a -> s -> [Context a a t]
contextsOn :: Plated a => ATraversal s t a a -> s -> [Context a a t]
contextsOf :: ATraversal' a a -> a -> [Context a a a]
contexts :: Plated a => a -> [Context a a a]
transformMOnOf :: Monad m => LensLike (WrappedMonad m) s t a b -> LensLike (WrappedMonad m) a b a b -> (b -> m b) -> s -> m t
transformMOf :: Monad m => LensLike (WrappedMonad m) a b a b -> (b -> m b) -> a -> m b
transformMOn :: (Monad m, Plated a) => LensLike (WrappedMonad m) s t a a -> (a -> m a) -> s -> m t
transformM :: (Monad m, Plated a) => (a -> m a) -> a -> m a
transformOnOf :: ASetter s t a b -> ASetter a b a b -> (b -> b) -> s -> t
transformOf :: ASetter a b a b -> (b -> b) -> a -> b
transformOn :: Plated a => ASetter s t a a -> (a -> a) -> s -> t
cosmosOnOf :: (Applicative f, Contravariant f) => LensLike' f s a -> LensLike' f a a -> LensLike' f s a
cosmosOn :: (Applicative f, Contravariant f, Plated a) => LensLike' f s a -> LensLike' f s a
cosmosOf :: (Applicative f, Contravariant f) => LensLike' f a a -> LensLike' f a a
cosmos :: Plated a => Fold a a
universeOnOf :: Getting (Endo [a]) s a -> Getting (Endo [a]) a a -> s -> [a]
universeOn :: Plated a => Getting (Endo [a]) s a -> s -> [a]
universeOf :: Getting (Endo [a]) a a -> a -> [a]
universe :: Plated a => a -> [a]
rewriteMOnOf :: Monad m => LensLike (WrappedMonad m) s t a b -> LensLike (WrappedMonad m) a b a b -> (b -> m (Maybe a)) -> s -> m t
rewriteMOn :: (Monad m, Plated a) => LensLike (WrappedMonad m) s t a a -> (a -> m (Maybe a)) -> s -> m t
rewriteMOf :: Monad m => LensLike (WrappedMonad m) a b a b -> (b -> m (Maybe a)) -> a -> m b
rewriteM :: (Monad m, Plated a) => (a -> m (Maybe a)) -> a -> m a
rewriteOnOf :: ASetter s t a b -> ASetter a b a b -> (b -> Maybe a) -> s -> t
rewriteOn :: Plated a => ASetter s t a a -> (a -> Maybe a) -> s -> t
rewriteOf :: ASetter a b a b -> (b -> Maybe a) -> a -> b
rewrite :: Plated a => (a -> Maybe a) -> a -> a
deep :: (Conjoined p, Applicative f, Plated s) => Traversing p f s s a b -> Over p f s s a b
class Plated a where
- plate :: Traversal' a a
class GPlated a (g :: k -> Type)
class GPlated1 (f :: k -> Type) (g :: k -> Type)
type family Zoomed (m :: Type -> Type) :: Type -> Type -> Type
type family Magnified (m :: Type -> Type) :: Type -> Type -> Type
class (MonadState s m, MonadState t n) => Zoom (m :: Type -> Type) (n :: Type -> Type) s t | m -> s, n -> t, m t -> n, n s -> m where
- zoom :: LensLike' (Zoomed m c) t s -> m c -> n c
class (Magnified m ~ Magnified n, MonadReader b m, MonadReader a n) => Magnify (m :: Type -> Type) (n :: Type -> Type) b a | m -> b, n -> a, m a -> n, n b -> m where
- magnify :: ((Functor (Magnified m c), Contravariant (Magnified m c)) => LensLike' (Magnified m c) a b) -> m c -> n c
alaf :: (Functor f, Functor g, Rewrapping s t) => (Unwrapped s -> s) -> (f t -> g s) -> f (Unwrapped t) -> g (Unwrapped s)
ala :: (Functor f, Rewrapping s t) => (Unwrapped s -> s) -> ((Unwrapped t -> t) -> f s) -> f (Unwrapped s)
_Unwrapping :: Rewrapping s t => (Unwrapped s -> s) -> Iso (Unwrapped t) (Unwrapped s) t s
_Wrapping :: Rewrapping s t => (Unwrapped s -> s) -> Iso s t (Unwrapped s) (Unwrapped t)
_Unwrapping' :: Wrapped s => (Unwrapped s -> s) -> Iso' (Unwrapped s) s
_Wrapping' :: Wrapped s => (Unwrapped s -> s) -> Iso' s (Unwrapped s)
op :: Wrapped s => (Unwrapped s -> s) -> s -> Unwrapped s
_Unwrapped :: Rewrapping s t => Iso (Unwrapped t) (Unwrapped s) t s
_Wrapped :: Rewrapping s t => Iso s t (Unwrapped s) (Unwrapped t)
_Unwrapped' :: Wrapped s => Iso' (Unwrapped s) s
_GWrapped' :: forall s (d :: Meta) (c :: Meta) (s' :: Meta) a. (Generic s, D1 d (C1 c (S1 s' (Rec0 a))) ~ Rep s, Unwrapped s ~ GUnwrapped (Rep s)) => Iso' s (Unwrapped s)
pattern Wrapped :: Rewrapped s s => Unwrapped s -> s
pattern Unwrapped :: Rewrapped t t => t -> Unwrapped t
type family Unwrapped s
class Wrapped s where
- type Unwrapped s
- _Wrapped' :: Iso' s (Unwrapped s)
class Wrapped s => Rewrapped s t
class (Rewrapped s t, Rewrapped t s) => Rewrapping s t
unsnoc :: Snoc s s a a => s -> Maybe (s, a)
snoc :: Snoc s s a a => s -> a -> s
(|>) :: Snoc s s a a => s -> a -> s
_last :: Snoc s s a a => Traversal' s a
_init :: Snoc s s a a => Traversal' s s
_tail :: Cons s s a a => Traversal' s s
_head :: Cons s s a a => Traversal' s a
uncons :: Cons s s a a => s -> Maybe (a, s)
cons :: Cons s s a a => a -> s -> s
(<|) :: Cons s s a a => a -> s -> s
pattern (:<) :: Cons b b a a => a -> b -> b
pattern (:>) :: Snoc a a b b => a -> b -> a
class Cons s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _Cons :: Prism s t (a, s) (b, t)
class Snoc s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _Snoc :: Prism s t (s, a) (t, b)
pattern Empty :: AsEmpty s => s
class AsEmpty a where
- _Empty :: Prism' a ()
coerced :: forall s t a b. (Coercible s a, Coercible t b) => Iso s t a b
seconding :: forall (f :: Type -> Type -> Type) (g :: Type -> Type -> Type) s t a b x y. (Bifunctor f, Bifunctor g) => AnIso s t a b -> Iso (f x s) (g y t) (f x a) (g y b)
firsting :: forall (f :: Type -> Type -> Type) (g :: Type -> Type -> Type) s t a b x y. (Bifunctor f, Bifunctor g) => AnIso s t a b -> Iso (f s x) (g t y) (f a x) (g b y)
bimapping :: forall (f :: Type -> Type -> Type) (g :: Type -> Type -> Type) s t a b s' t' a' b'. (Bifunctor f, Bifunctor g) => AnIso s t a b -> AnIso s' t' a' b' -> Iso (f s s') (g t t') (f a a') (g b b')
rmapping :: forall (p :: Type -> Type -> Type) (q :: Type -> Type -> Type) s t a b x y. (Profunctor p, Profunctor q) => AnIso s t a b -> Iso (p x s) (q y t) (p x a) (q y b)
lmapping :: forall (p :: Type -> Type -> Type) (q :: Type -> Type -> Type) s t a b x y. (Profunctor p, Profunctor q) => AnIso s t a b -> Iso (p a x) (q b y) (p s x) (q t y)
dimapping :: forall (p :: Type -> Type -> Type) (q :: Type -> Type -> Type) s t a b s' t' a' b'. (Profunctor p, Profunctor q) => AnIso s t a b -> AnIso s' t' a' b' -> Iso (p a s') (q b t') (p s a') (q t b')
contramapping :: forall (f :: Type -> Type) s t a b. Contravariant f => AnIso s t a b -> Iso (f a) (f b) (f s) (f t)
imagma :: Over (Indexed i) (Molten i a b) s t a b -> Iso s t' (Magma i t b a) (Magma j t' c c)
magma :: LensLike (Mafic a b) s t a b -> Iso s u (Magma Int t b a) (Magma j u c c)
involuted :: (a -> a) -> Iso' a a
reversed :: Reversing a => Iso' a a
lazy :: Strict lazy strict => Iso' strict lazy
strict :: Strict lazy strict => Iso' lazy strict
swapped :: forall (p :: Type -> Type -> Type) a b c d. Swap p => Iso (p a b) (p c d) (p b a) (p d c)
flipped :: Iso (a -> b -> c) (a' -> b' -> c') (b -> a -> c) (b' -> a' -> c')
uncurried :: Iso (a -> b -> c) (d -> e -> f) ((a, b) -> c) ((d, e) -> f)
curried :: Iso ((a, b) -> c) ((d, e) -> f) (a -> b -> c) (d -> e -> f)
anon :: a -> (a -> Bool) -> Iso' (Maybe a) a
non' :: APrism' a () -> Iso' (Maybe a) a
non :: Eq a => a -> Iso' (Maybe a) a
mapping :: forall (f :: Type -> Type) (g :: Type -> Type) s t a b. (Functor f, Functor g) => AnIso s t a b -> Iso (f s) (g t) (f a) (g b)
enum :: Enum a => Iso' Int a
under :: AnIso s t a b -> (t -> s) -> b -> a
xplatf :: forall {k} {k2} f g (s :: k) (t :: k2) (a :: k) (b :: k2). Optic (Costar f) g s t a b -> (f a -> g b) -> f s -> g t
xplat :: forall {k2} s g (t :: k2) a (b :: k2). Optic (Costar ((->) s)) g s t a b -> ((s -> a) -> g b) -> g t
auf :: (Functor f, Functor g) => AnIso s t a b -> (f t -> g s) -> f b -> g a
au :: Functor f => AnIso s t a b -> ((b -> t) -> f s) -> f a
cloneIso :: AnIso s t a b -> Iso s t a b
withIso :: forall s t a b (rep :: RuntimeRep) (r :: TYPE rep). AnIso s t a b -> ((s -> a) -> (b -> t) -> r) -> r
from :: AnIso s t a b -> Iso b a t s
iso :: (s -> a) -> (b -> t) -> Iso s t a b
pattern Strict :: Strict s t => t -> s
pattern Lazy :: Strict t s => t -> s
pattern Swapped :: Swap p => p b a -> p a b
pattern Reversed :: Reversing t => t -> t
pattern List :: IsList l => [Item l] -> l
type AnIso s t a b = Exchange a b a (Identity b) -> Exchange a b s (Identity t)
type AnIso' s a = AnIso s s a a
withEquality :: forall {k1} {k2} (s :: k1) (t :: k2) (a :: k1) (b :: k2) (rep :: RuntimeRep) (r :: TYPE rep). AnEquality s t a b -> ((s :~: a) -> (b :~: t) -> r) -> r
fromLeibniz' :: forall {k2} (s :: k2) (a :: k2). ((s :~: s) -> s :~: a) -> Equality' s a
fromLeibniz :: forall {k1} {k2} (a :: k1) (b :: k2) (s :: k1) (t :: k2). (Identical a b a b -> Identical a b s t) -> Equality s t a b
underEquality :: forall {k1} {k2} (s :: k1) (t :: k2) (a :: k1) (b :: k2) p. AnEquality s t a b -> p t s -> p b a
overEquality :: forall {k1} {k2} (s :: k1) (t :: k2) (a :: k1) (b :: k2) p. AnEquality s t a b -> p a b -> p s t
equality' :: forall {k2} (a :: k2) (b :: k2). (a :~: b) -> Equality' a b
equality :: forall {k1} {k2} (s :: k1) (a :: k1) (b :: k2) (t :: k2). (s :~: a) -> (b :~: t) -> Equality s t a b
cloneEquality :: forall {k1} {k2} (s :: k1) (t :: k2) (a :: k1) (b :: k2). AnEquality s t a b -> Equality s t a b
simple :: forall {k2} (a :: k2). Equality' a a
simply :: forall {k} {k1} p (f :: k -> k1) (s :: k) (a :: k) (rep :: RuntimeRep) (r :: TYPE rep). (Optic' p f s a -> r) -> Optic' p f s a -> r
fromEq :: forall {k2} {k1} (s :: k2) (t :: k1) (a :: k2) (b :: k1). AnEquality s t a b -> Equality b a t s
mapEq :: forall k1 k2 (s :: k1) (t :: k2) (a :: k1) (b :: k2) f. AnEquality s t a b -> f s -> f a
substEq :: forall {k1} {k2} (s :: k1) (t :: k2) (a :: k1) (b :: k2) (rep :: RuntimeRep) (r :: TYPE rep). AnEquality s t a b -> ((s ~ a, t ~ b) => r) -> r
runEq :: forall {k1} {k2} (s :: k1) (t :: k2) (a :: k1) (b :: k2). AnEquality s t a b -> Identical s t a b
data Identical (a :: k) (b :: k1) (s :: k) (t :: k1) where
- Identical :: forall {k} {k1} (a :: k) (b :: k1). Identical a b a b
type AnEquality (s :: k) (t :: k1) (a :: k) (b :: k2) = Identical a (Proxy b) a (Proxy b) -> Identical a (Proxy b) s (Proxy t)
type AnEquality' (s :: k) (a :: k) = AnEquality s s a a
itraverseByOf :: IndexedTraversal i s t a b -> (forall x. x -> f x) -> (forall x y. f (x -> y) -> f x -> f y) -> (i -> a -> f b) -> s -> f t
itraverseBy :: TraversableWithIndex i t => (forall x. x -> f x) -> (forall x y. f (x -> y) -> f x -> f y) -> (i -> a -> f b) -> t a -> f (t b)
ifoldMapByOf :: IndexedFold i t a -> (r -> r -> r) -> r -> (i -> a -> r) -> t -> r
ifoldMapBy :: FoldableWithIndex i t => (r -> r -> r) -> r -> (i -> a -> r) -> t a -> r
itraversed :: forall i (t :: Type -> Type) a b. TraversableWithIndex i t => IndexedTraversal i (t a) (t b) a b
ifolded :: forall i (f :: Type -> Type) a. FoldableWithIndex i f => IndexedFold i (f a) a
imapped :: forall i (f :: Type -> Type) a b. FunctorWithIndex i f => IndexedSetter i (f a) (f b) a b
index :: (Indexable i p, Eq i, Applicative f) => i -> Optical' p (Indexed i) f a a
icompose :: Indexable p c => (i -> j -> p) -> (Indexed i s t -> r) -> (Indexed j a b -> s -> t) -> c a b -> r
reindexed :: Indexable j p => (i -> j) -> (Indexed i a b -> r) -> p a b -> r
selfIndex :: Indexable a p => p a fb -> a -> fb
(<.) :: Indexable i p => (Indexed i s t -> r) -> ((a -> b) -> s -> t) -> p a b -> r
newtype ReifiedLens s t a b = Lens {
- runLens :: Lens s t a b
}
type ReifiedLens' s a = ReifiedLens s s a a
newtype ReifiedIndexedLens i s t a b = IndexedLens {
- runIndexedLens :: IndexedLens i s t a b
}
type ReifiedIndexedLens' i s a = ReifiedIndexedLens i s s a a
newtype ReifiedIndexedTraversal i s t a b = IndexedTraversal {
- runIndexedTraversal :: IndexedTraversal i s t a b
}
type ReifiedIndexedTraversal' i s a = ReifiedIndexedTraversal i s s a a
newtype ReifiedTraversal s t a b = Traversal {
- runTraversal :: Traversal s t a b
}
type ReifiedTraversal' s a = ReifiedTraversal s s a a
newtype ReifiedGetter s a = Getter {
- runGetter :: Getter s a
}
newtype ReifiedIndexedGetter i s a = IndexedGetter {
- runIndexedGetter :: IndexedGetter i s a
}
newtype ReifiedFold s a = Fold {
- runFold :: Fold s a
}
newtype ReifiedIndexedFold i s a = IndexedFold {
- runIndexedFold :: IndexedFold i s a
}
newtype ReifiedSetter s t a b = Setter {
- runSetter :: Setter s t a b
}
type ReifiedSetter' s a = ReifiedSetter s s a a
newtype ReifiedIndexedSetter i s t a b = IndexedSetter {
- runIndexedSetter :: IndexedSetter i s t a b
}
type ReifiedIndexedSetter' i s a = ReifiedIndexedSetter i s s a a
newtype ReifiedIso s t a b = Iso {
- runIso :: Iso s t a b
}
type ReifiedIso' s a = ReifiedIso s s a a
newtype ReifiedPrism s t a b = Prism {
- runPrism :: Prism s t a b
}
type ReifiedPrism' s a = ReifiedPrism s s a a
ilevels :: forall (f :: Type -> Type) i s t a b j. Applicative f => Traversing (Indexed i) f s t a b -> IndexedLensLike Int f s t (Level i a) (Level j b)
sequenceByOf :: Traversal s t (f b) b -> (forall x. x -> f x) -> (forall x y. f (x -> y) -> f x -> f y) -> s -> f t
traverseByOf :: Traversal s t a b -> (forall x. x -> f x) -> (forall x y. f (x -> y) -> f x -> f y) -> (a -> f b) -> s -> f t
confusing :: Applicative f => LensLike (Curried (Yoneda f) (Yoneda f)) s t a b -> LensLike f s t a b
deepOf :: (Conjoined p, Applicative f) => LensLike f s t s t -> Traversing p f s t a b -> Over p f s t a b
failing :: (Conjoined p, Applicative f) => Traversing p f s t a b -> Over p f s t a b -> Over p f s t a b
ifailover :: Alternative m => Over (Indexed i) ((,) Any) s t a b -> (i -> a -> b) -> s -> m t
failover :: Alternative m => LensLike ((,) Any) s t a b -> (a -> b) -> s -> m t
elements :: forall (t :: Type -> Type) a. Traversable t => (Int -> Bool) -> IndexedTraversal' Int (t a) a
elementsOf :: forall (f :: Type -> Type) s t a. Applicative f => LensLike (Indexing f) s t a a -> (Int -> Bool) -> IndexedLensLike Int f s t a a
element :: forall (t :: Type -> Type) a. Traversable t => Int -> IndexedTraversal' Int (t a) a
elementOf :: forall (f :: Type -> Type) s t a. Applicative f => LensLike (Indexing f) s t a a -> Int -> IndexedLensLike Int f s t a a
ignored :: Applicative f => pafb -> s -> f s
traversed64 :: forall (f :: Type -> Type) a b. Traversable f => IndexedTraversal Int64 (f a) (f b) a b
traversed1 :: forall (f :: TYPE LiftedRep -> Type) a b. Traversable1 f => IndexedTraversal1 Int (f a) (f b) a b
traversed :: forall (f :: Type -> Type) a b. Traversable f => IndexedTraversal Int (f a) (f b) a b
imapAccumLOf :: Over (Indexed i) (State acc) s t a b -> (i -> acc -> a -> (acc, b)) -> acc -> s -> (acc, t)
imapAccumROf :: Over (Indexed i) (Backwards (State acc)) s t a b -> (i -> acc -> a -> (acc, b)) -> acc -> s -> (acc, t)
iforMOf :: (Indexed i a (WrappedMonad m b) -> s -> WrappedMonad m t) -> s -> (i -> a -> m b) -> m t
imapMOf :: Over (Indexed i) (WrappedMonad m) s t a b -> (i -> a -> m b) -> s -> m t
iforOf :: (Indexed i a (f b) -> s -> f t) -> s -> (i -> a -> f b) -> f t
itraverseOf :: (Indexed i a (f b) -> s -> f t) -> (i -> a -> f b) -> s -> f t
cloneIndexedTraversal1 :: AnIndexedTraversal1 i s t a b -> IndexedTraversal1 i s t a b
cloneIndexPreservingTraversal1 :: ATraversal1 s t a b -> IndexPreservingTraversal1 s t a b
cloneTraversal1 :: ATraversal1 s t a b -> Traversal1 s t a b
cloneIndexedTraversal :: AnIndexedTraversal i s t a b -> IndexedTraversal i s t a b
cloneIndexPreservingTraversal :: ATraversal s t a b -> IndexPreservingTraversal s t a b
cloneTraversal :: ATraversal s t a b -> Traversal s t a b
dropping :: (Conjoined p, Applicative f) => Int -> Over p (Indexing f) s t a a -> Over p f s t a a
taking :: (Conjoined p, Applicative f) => Int -> Traversing p f s t a a -> Over p f s t a a
both1 :: forall (r :: TYPE LiftedRep -> TYPE LiftedRep -> Type) a b. Bitraversable1 r => Traversal1 (r a a) (r b b) a b
both :: forall (r :: Type -> Type -> Type) a b. Bitraversable r => Traversal (r a a) (r b b) a b
holes1Of :: Conjoined p => Over p (Bazaar1 p a a) s t a a -> s -> NonEmpty (Pretext p a a t)
holesOf :: Conjoined p => Over p (Bazaar p a a) s t a a -> s -> [Pretext p a a t]
unsafeSingular :: (HasCallStack, Conjoined p, Functor f) => Traversing p f s t a b -> Over p f s t a b
iunsafePartsOf' :: forall i s t a b. Over (Indexed i) (Bazaar (Indexed i) a b) s t a b -> IndexedLens [i] s t [a] [b]
unsafePartsOf' :: ATraversal s t a b -> Lens s t [a] [b]
iunsafePartsOf :: (Indexable [i] p, Functor f) => Traversing (Indexed i) f s t a b -> Over p f s t [a] [b]
unsafePartsOf :: Functor f => Traversing (->) f s t a b -> LensLike f s t [a] [b]
ipartsOf' :: forall i p f s t a. (Indexable [i] p, Functor f) => Over (Indexed i) (Bazaar' (Indexed i) a) s t a a -> Over p f s t [a] [a]
partsOf' :: ATraversal s t a a -> Lens s t [a] [a]
ipartsOf :: (Indexable [i] p, Functor f) => Traversing (Indexed i) f s t a a -> Over p f s t [a] [a]
partsOf :: Functor f => Traversing (->) f s t a a -> LensLike f s t [a] [a]
iloci :: IndexedTraversal i (Bazaar (Indexed i) a c s) (Bazaar (Indexed i) b c s) a b
loci :: Traversal (Bazaar (->) a c s) (Bazaar (->) b c s) a b
scanl1Of :: LensLike (State (Maybe a)) s t a a -> (a -> a -> a) -> s -> t
scanr1Of :: LensLike (Backwards (State (Maybe a))) s t a a -> (a -> a -> a) -> s -> t
mapAccumLOf :: LensLike (State acc) s t a b -> (acc -> a -> (acc, b)) -> acc -> s -> (acc, t)
mapAccumROf :: LensLike (Backwards (State acc)) s t a b -> (acc -> a -> (acc, b)) -> acc -> s -> (acc, t)
transposeOf :: LensLike ZipList s t [a] a -> s -> [t]
sequenceOf :: LensLike (WrappedMonad m) s t (m b) b -> s -> m t
forMOf :: LensLike (WrappedMonad m) s t a b -> s -> (a -> m b) -> m t
mapMOf :: LensLike (WrappedMonad m) s t a b -> (a -> m b) -> s -> m t
sequenceAOf :: LensLike f s t (f b) b -> s -> f t
forOf :: LensLike f s t a b -> s -> (a -> f b) -> f t
traverseOf :: LensLike f s t a b -> (a -> f b) -> s -> f t
traversal :: ((a -> f b) -> s -> f t) -> LensLike f s t a b
type ATraversal s t a b = LensLike (Bazaar (->) a b) s t a b
type ATraversal' s a = ATraversal s s a a
type ATraversal1 s t a b = LensLike (Bazaar1 (->) a b) s t a b
type ATraversal1' s a = ATraversal1 s s a a
type AnIndexedTraversal i s t a b = Over (Indexed i) (Bazaar (Indexed i) a b) s t a b
type AnIndexedTraversal1 i s t a b = Over (Indexed i) (Bazaar1 (Indexed i) a b) s t a b
type AnIndexedTraversal' i s a = AnIndexedTraversal i s s a a
type AnIndexedTraversal1' i s a = AnIndexedTraversal1 i s s a a
type Traversing (p :: Type -> Type -> Type) (f :: Type -> Type) s t a b = Over p (BazaarT p f a b) s t a b
type Traversing1 (p :: Type -> Type -> Type) (f :: Type -> Type) s t a b = Over p (BazaarT1 p f a b) s t a b
type Traversing' (p :: Type -> Type -> Type) (f :: Type -> Type) s a = Traversing p f s s a a
type Traversing1' (p :: Type -> Type -> Type) (f :: Type -> Type) s a = Traversing1 p f s s a a
class Ord k => TraverseMin k (m :: Type -> Type) | m -> k where
- traverseMin :: IndexedTraversal' k (m v) v
class Ord k => TraverseMax k (m :: Type -> Type) | m -> k where
- traverseMax :: IndexedTraversal' k (m v) v
foldMapByOf :: Fold s a -> (r -> r -> r) -> r -> (a -> r) -> s -> r
foldByOf :: Fold s a -> (a -> a -> a) -> a -> s -> a
idroppingWhile :: (Indexable i p, Profunctor q, Applicative f) => (i -> a -> Bool) -> Optical (Indexed i) q (Compose (State Bool) f) s t a a -> Optical p q f s t a a
itakingWhile :: (Indexable i p, Profunctor q, Contravariant f, Applicative f) => (i -> a -> Bool) -> Optical' (Indexed i) q (Const (Endo (f s)) :: Type -> Type) s a -> Optical' p q f s a
ifiltered :: (Indexable i p, Applicative f) => (i -> a -> Bool) -> Optical' p (Indexed i) f a a
findIndicesOf :: IndexedGetting i (Endo [i]) s a -> (a -> Bool) -> s -> [i]
findIndexOf :: IndexedGetting i (First i) s a -> (a -> Bool) -> s -> Maybe i
elemIndicesOf :: Eq a => IndexedGetting i (Endo [i]) s a -> a -> s -> [i]
elemIndexOf :: Eq a => IndexedGetting i (First i) s a -> a -> s -> Maybe i
(^@?!) :: HasCallStack => s -> IndexedGetting i (Endo (i, a)) s a -> (i, a)
(^@?) :: s -> IndexedGetting i (Endo (Maybe (i, a))) s a -> Maybe (i, a)
(^@..) :: s -> IndexedGetting i (Endo [(i, a)]) s a -> [(i, a)]
itoListOf :: IndexedGetting i (Endo [(i, a)]) s a -> s -> [(i, a)]
ifoldlMOf :: Monad m => IndexedGetting i (Endo (r -> m r)) s a -> (i -> r -> a -> m r) -> r -> s -> m r
ifoldrMOf :: Monad m => IndexedGetting i (Dual (Endo (r -> m r))) s a -> (i -> a -> r -> m r) -> r -> s -> m r
ifoldlOf' :: IndexedGetting i (Endo (r -> r)) s a -> (i -> r -> a -> r) -> r -> s -> r
ifoldrOf' :: IndexedGetting i (Dual (Endo (r -> r))) s a -> (i -> a -> r -> r) -> r -> s -> r
ifindMOf :: Monad m => IndexedGetting i (Endo (m (Maybe a))) s a -> (i -> a -> m Bool) -> s -> m (Maybe a)
ifindOf :: IndexedGetting i (Endo (Maybe a)) s a -> (i -> a -> Bool) -> s -> Maybe a
iconcatMapOf :: IndexedGetting i [r] s a -> (i -> a -> [r]) -> s -> [r]
iforMOf_ :: Monad m => IndexedGetting i (Sequenced r m) s a -> s -> (i -> a -> m r) -> m ()
imapMOf_ :: Monad m => IndexedGetting i (Sequenced r m) s a -> (i -> a -> m r) -> s -> m ()
iforOf_ :: Functor f => IndexedGetting i (Traversed r f) s a -> s -> (i -> a -> f r) -> f ()
itraverseOf_ :: Functor f => IndexedGetting i (Traversed r f) s a -> (i -> a -> f r) -> s -> f ()
inoneOf :: IndexedGetting i Any s a -> (i -> a -> Bool) -> s -> Bool
iallOf :: IndexedGetting i All s a -> (i -> a -> Bool) -> s -> Bool
ianyOf :: IndexedGetting i Any s a -> (i -> a -> Bool) -> s -> Bool
ifoldlOf :: IndexedGetting i (Dual (Endo r)) s a -> (i -> r -> a -> r) -> r -> s -> r
ifoldrOf :: IndexedGetting i (Endo r) s a -> (i -> a -> r -> r) -> r -> s -> r
ifoldMapOf :: IndexedGetting i m s a -> (i -> a -> m) -> s -> m
ipreuses :: MonadState s m => IndexedGetting i (First r) s a -> (i -> a -> r) -> m (Maybe r)
preuses :: MonadState s m => Getting (First r) s a -> (a -> r) -> m (Maybe r)
ipreuse :: MonadState s m => IndexedGetting i (First (i, a)) s a -> m (Maybe (i, a))
preuse :: MonadState s m => Getting (First a) s a -> m (Maybe a)
ipreviews :: MonadReader s m => IndexedGetting i (First r) s a -> (i -> a -> r) -> m (Maybe r)
previews :: MonadReader s m => Getting (First r) s a -> (a -> r) -> m (Maybe r)
ipreview :: MonadReader s m => IndexedGetting i (First (i, a)) s a -> m (Maybe (i, a))
preview :: MonadReader s m => Getting (First a) s a -> m (Maybe a)
ipre :: IndexedGetting i (First (i, a)) s a -> IndexPreservingGetter s (Maybe (i, a))
pre :: Getting (First a) s a -> IndexPreservingGetter s (Maybe a)
hasn't :: Getting All s a -> s -> Bool
has :: Getting Any s a -> s -> Bool
foldlMOf :: Monad m => Getting (Endo (r -> m r)) s a -> (r -> a -> m r) -> r -> s -> m r
foldrMOf :: Monad m => Getting (Dual (Endo (r -> m r))) s a -> (a -> r -> m r) -> r -> s -> m r
foldl1Of' :: HasCallStack => Getting (Endo (Endo (Maybe a))) s a -> (a -> a -> a) -> s -> a
foldr1Of' :: HasCallStack => Getting (Dual (Endo (Endo (Maybe a)))) s a -> (a -> a -> a) -> s -> a
foldlOf' :: Getting (Endo (Endo r)) s a -> (r -> a -> r) -> r -> s -> r
foldrOf' :: Getting (Dual (Endo (Endo r))) s a -> (a -> r -> r) -> r -> s -> r
foldl1Of :: HasCallStack => Getting (Dual (Endo (Maybe a))) s a -> (a -> a -> a) -> s -> a
foldr1Of :: HasCallStack => Getting (Endo (Maybe a)) s a -> (a -> a -> a) -> s -> a
lookupOf :: Eq k => Getting (Endo (Maybe v)) s (k, v) -> k -> s -> Maybe v
findMOf :: Monad m => Getting (Endo (m (Maybe a))) s a -> (a -> m Bool) -> s -> m (Maybe a)
findOf :: Getting (Endo (Maybe a)) s a -> (a -> Bool) -> s -> Maybe a
minimumByOf :: Getting (Endo (Endo (Maybe a))) s a -> (a -> a -> Ordering) -> s -> Maybe a
maximumByOf :: Getting (Endo (Endo (Maybe a))) s a -> (a -> a -> Ordering) -> s -> Maybe a
minimum1Of :: Ord a => Getting (Min a) s a -> s -> a
minimumOf :: Ord a => Getting (Endo (Endo (Maybe a))) s a -> s -> Maybe a
maximum1Of :: Ord a => Getting (Max a) s a -> s -> a
maximumOf :: Ord a => Getting (Endo (Endo (Maybe a))) s a -> s -> Maybe a
notNullOf :: Getting Any s a -> s -> Bool
nullOf :: Getting All s a -> s -> Bool
last1Of :: Getting (Last a) s a -> s -> a
lastOf :: Getting (Rightmost a) s a -> s -> Maybe a
first1Of :: Getting (First a) s a -> s -> a
firstOf :: Getting (Leftmost a) s a -> s -> Maybe a
(^?!) :: HasCallStack => s -> Getting (Endo a) s a -> a
(^?) :: s -> Getting (First a) s a -> Maybe a
lengthOf :: Getting (Endo (Endo Int)) s a -> s -> Int
concatOf :: Getting [r] s [r] -> s -> [r]
concatMapOf :: Getting [r] s a -> (a -> [r]) -> s -> [r]
notElemOf :: Eq a => Getting All s a -> a -> s -> Bool
elemOf :: Eq a => Getting Any s a -> a -> s -> Bool
msumOf :: MonadPlus m => Getting (Endo (m a)) s (m a) -> s -> m a
asumOf :: Alternative f => Getting (Endo (f a)) s (f a) -> s -> f a
sequenceOf_ :: Monad m => Getting (Sequenced a m) s (m a) -> s -> m ()
forMOf_ :: Monad m => Getting (Sequenced r m) s a -> s -> (a -> m r) -> m ()
mapMOf_ :: Monad m => Getting (Sequenced r m) s a -> (a -> m r) -> s -> m ()
sequence1Of_ :: Functor f => Getting (TraversedF a f) s (f a) -> s -> f ()
for1Of_ :: Functor f => Getting (TraversedF r f) s a -> s -> (a -> f r) -> f ()
traverse1Of_ :: Functor f => Getting (TraversedF r f) s a -> (a -> f r) -> s -> f ()
sequenceAOf_ :: Functor f => Getting (Traversed a f) s (f a) -> s -> f ()
forOf_ :: Functor f => Getting (Traversed r f) s a -> s -> (a -> f r) -> f ()
traverseOf_ :: Functor f => Getting (Traversed r f) s a -> (a -> f r) -> s -> f ()
sumOf :: Num a => Getting (Endo (Endo a)) s a -> s -> a
productOf :: Num a => Getting (Endo (Endo a)) s a -> s -> a
noneOf :: Getting Any s a -> (a -> Bool) -> s -> Bool
allOf :: Getting All s a -> (a -> Bool) -> s -> Bool
anyOf :: Getting Any s a -> (a -> Bool) -> s -> Bool
orOf :: Getting Any s Bool -> s -> Bool
andOf :: Getting All s Bool -> s -> Bool
(^..) :: s -> Getting (Endo [a]) s a -> [a]
toNonEmptyOf :: Getting (NonEmptyDList a) s a -> s -> NonEmpty a
toListOf :: Getting (Endo [a]) s a -> s -> [a]
foldlOf :: Getting (Dual (Endo r)) s a -> (r -> a -> r) -> r -> s -> r
foldrOf :: Getting (Endo r) s a -> (a -> r -> r) -> r -> s -> r
foldOf :: Getting a s a -> s -> a
foldMapOf :: Getting r s a -> (a -> r) -> s -> r
lined :: forall (f :: Type -> Type). Applicative f => IndexedLensLike' Int f String String
worded :: forall (f :: Type -> Type). Applicative f => IndexedLensLike' Int f String String
droppingWhile :: (Conjoined p, Profunctor q, Applicative f) => (a -> Bool) -> Optical p q (Compose (State Bool) f) s t a a -> Optical p q f s t a a
takingWhile :: (Conjoined p, Applicative f) => (a -> Bool) -> Over p (TakingWhile p f a a) s t a a -> Over p f s t a a
filteredBy :: (Indexable i p, Applicative f) => Getting (First i) a i -> p a (f a) -> a -> f a
filtered :: (Choice p, Applicative f) => (a -> Bool) -> Optic' p f a a
iterated :: Apply f => (a -> a) -> LensLike' f a a
unfolded :: (b -> Maybe (a, b)) -> Fold b a
cycled :: Apply f => LensLike f s t a b -> LensLike f s t a b
replicated :: Int -> Fold a a
repeated :: Apply f => LensLike' f a a
folded64 :: forall (f :: TYPE LiftedRep -> Type) a. Foldable f => IndexedFold Int64 (f a) a
folded :: forall (f :: TYPE LiftedRep -> Type) a. Foldable f => IndexedFold Int (f a) a
ifoldring :: (Indexable i p, Contravariant f, Applicative f) => ((i -> a -> f a -> f a) -> f a -> s -> f a) -> Over p f s t a b
foldring :: (Contravariant f, Applicative f) => ((a -> f a -> f a) -> f a -> s -> f a) -> LensLike f s t a b
ifolding :: (Foldable f, Indexable i p, Contravariant g, Applicative g) => (s -> f (i, a)) -> Over p g s t a b
folding :: Foldable f => (s -> f a) -> Fold s a
_Show :: (Read a, Show a) => Prism' String a
nearly :: a -> (a -> Bool) -> Prism' a ()
only :: Eq a => a -> Prism' a ()
_Void :: Prism s s a Void
_Nothing :: Prism' (Maybe a) ()
_Just :: Prism (Maybe a) (Maybe b) a b
_Right :: Prism (Either c a) (Either c b) a b
_Left :: Prism (Either a c) (Either b c) a b
matching' :: LensLike (Either a) s t a b -> s -> Either t a
matching :: APrism s t a b -> s -> Either t a
isn't :: APrism s t a b -> s -> Bool
below :: forall (f :: Type -> Type) s a. Traversable f => APrism' s a -> Prism' (f s) (f a)
aside :: APrism s t a b -> Prism (e, s) (e, t) (e, a) (e, b)
without :: APrism s t a b -> APrism u v c d -> Prism (Either s u) (Either t v) (Either a c) (Either b d)
prism' :: (b -> s) -> (s -> Maybe a) -> Prism s s a b
prism :: (b -> t) -> (s -> Either t a) -> Prism s t a b
clonePrism :: APrism s t a b -> Prism s t a b
withPrism :: APrism s t a b -> ((b -> t) -> (s -> Either t a) -> r) -> r
type APrism s t a b = Market a b a (Identity b) -> Market a b s (Identity t)
type APrism' s a = APrism s s a a
class Prefixed t where
- prefixed :: t -> Prism' t t
class Suffixed t where
- suffixed :: t -> Prism' t t
reviewing :: (Bifunctor p, Functor f) => Optic (Tagged :: Type -> Type -> Type) Identity s t a b -> Optic' p f t b
reuses :: MonadState b m => AReview t b -> (t -> r) -> m r
reuse :: MonadState b m => AReview t b -> m t
reviews :: MonadReader b m => AReview t b -> (t -> r) -> m r
review :: MonadReader b m => AReview t b -> m t
re :: AReview t b -> Getter b t
un :: (Profunctor p, Bifunctor p, Functor f) => Getting a s a -> Optic' p f a s
unto :: (Profunctor p, Bifunctor p, Functor f) => (b -> t) -> Optic p f s t a b
getting :: (Profunctor p, Profunctor q, Functor f, Contravariant f) => Optical p q f s t a b -> Optical' p q f s a
(^@.) :: s -> IndexedGetting i (i, a) s a -> (i, a)
iuses :: MonadState s m => IndexedGetting i r s a -> (i -> a -> r) -> m r
iuse :: MonadState s m => IndexedGetting i (i, a) s a -> m (i, a)
iviews :: MonadReader s m => IndexedGetting i r s a -> (i -> a -> r) -> m r
iview :: MonadReader s m => IndexedGetting i (i, a) s a -> m (i, a)
ilistenings :: MonadWriter w m => IndexedGetting i v w u -> (i -> u -> v) -> m a -> m (a, v)
listenings :: MonadWriter w m => Getting v w u -> (u -> v) -> m a -> m (a, v)
ilistening :: MonadWriter w m => IndexedGetting i (i, u) w u -> m a -> m (a, (i, u))
listening :: MonadWriter w m => Getting u w u -> m a -> m (a, u)
uses :: MonadState s m => LensLike' (Const r :: Type -> Type) s a -> (a -> r) -> m r
use :: MonadState s m => Getting a s a -> m a
(^.) :: s -> Getting a s a -> a
views :: MonadReader s m => LensLike' (Const r :: Type -> Type) s a -> (a -> r) -> m r
view :: MonadReader s m => Getting a s a -> m a
ilike :: (Indexable i p, Contravariant f, Functor f) => i -> a -> Over' p f s a
like :: (Profunctor p, Contravariant f, Functor f) => a -> Optic' p f s a
ito :: (Indexable i p, Contravariant f) => (s -> (i, a)) -> Over' p f s a
to :: (Profunctor p, Contravariant f) => (s -> a) -> Optic' p f s a
type Getting r s a = (a -> Const r a) -> s -> Const r s
type IndexedGetting i m s a = Indexed i a (Const m a) -> s -> Const m s
type Accessing (p :: Type -> Type -> Type) m s a = p a (Const m a) -> s -> Const m s
_19' :: Field19 s t a b => Lens s t a b
_18' :: Field18 s t a b => Lens s t a b
_17' :: Field17 s t a b => Lens s t a b
_16' :: Field16 s t a b => Lens s t a b
_15' :: Field15 s t a b => Lens s t a b
_14' :: Field14 s t a b => Lens s t a b
_13' :: Field13 s t a b => Lens s t a b
_12' :: Field12 s t a b => Lens s t a b
_11' :: Field11 s t a b => Lens s t a b
_10' :: Field10 s t a b => Lens s t a b
_9' :: Field9 s t a b => Lens s t a b
_8' :: Field8 s t a b => Lens s t a b
_7' :: Field7 s t a b => Lens s t a b
_6' :: Field6 s t a b => Lens s t a b
_5' :: Field5 s t a b => Lens s t a b
_4' :: Field4 s t a b => Lens s t a b
_3' :: Field3 s t a b => Lens s t a b
_2' :: Field2 s t a b => Lens s t a b
_1' :: Field1 s t a b => Lens s t a b
class Field1 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _1 :: Lens s t a b
class Field2 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _2 :: Lens s t a b
class Field3 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _3 :: Lens s t a b
class Field4 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _4 :: Lens s t a b
class Field5 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _5 :: Lens s t a b
class Field6 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _6 :: Lens s t a b
class Field7 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _7 :: Lens s t a b
class Field8 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _8 :: Lens s t a b
class Field9 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _9 :: Lens s t a b
class Field10 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _10 :: Lens s t a b
class Field11 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _11 :: Lens s t a b
class Field12 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _12 :: Lens s t a b
class Field13 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _13 :: Lens s t a b
class Field14 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _14 :: Lens s t a b
class Field15 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _15 :: Lens s t a b
class Field16 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _16 :: Lens s t a b
class Field17 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _17 :: Lens s t a b
class Field18 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _18 :: Lens s t a b
class Field19 s t a b | s -> a, t -> b, s b -> t, t a -> s where
- _19 :: Lens s t a b
fusing :: Functor f => LensLike (Yoneda f) s t a b -> LensLike f s t a b
last1 :: forall (t :: TYPE LiftedRep -> Type) a. Traversable1 t => Lens' (t a) a
head1 :: forall (t :: TYPE LiftedRep -> Type) a. Traversable1 t => Lens' (t a) a
united :: Lens' a ()
devoid :: forall {k} p f (a :: k) b. Over p f Void Void a b
(<#=) :: MonadState s m => ALens s s a b -> b -> m b
(<#~) :: ALens s t a b -> b -> s -> (b, t)
(#%%=) :: MonadState s m => ALens s s a b -> (a -> (r, b)) -> m r
(<#%=) :: MonadState s m => ALens s s a b -> (a -> b) -> m b
(<#%~) :: ALens s t a b -> (a -> b) -> s -> (b, t)
(#%=) :: MonadState s m => ALens s s a b -> (a -> b) -> m ()
(#=) :: MonadState s m => ALens s s a b -> b -> m ()
(#%%~) :: Functor f => ALens s t a b -> (a -> f b) -> s -> f t
(#%~) :: ALens s t a b -> (a -> b) -> s -> t
(#~) :: ALens s t a b -> b -> s -> t
storing :: ALens s t a b -> b -> s -> t
(^#) :: s -> ALens s t a b -> a
(<<%@=) :: MonadState s m => Over (Indexed i) ((,) a) s s a b -> (i -> a -> b) -> m a
(<%@=) :: MonadState s m => Over (Indexed i) ((,) b) s s a b -> (i -> a -> b) -> m b
(%%@=) :: MonadState s m => Over (Indexed i) ((,) r) s s a b -> (i -> a -> (r, b)) -> m r
(%%@~) :: forall {k1} i f s (t :: k1) a (b :: k1). Over (Indexed i) f s t a b -> (i -> a -> f b) -> s -> f t
(<<%@~) :: Over (Indexed i) ((,) a) s t a b -> (i -> a -> b) -> s -> (a, t)
(<%@~) :: Over (Indexed i) ((,) b) s t a b -> (i -> a -> b) -> s -> (b, t)
overA :: Arrow ar => LensLike (Context a b) s t a b -> ar a b -> ar s t
(<<>=) :: (MonadState s m, Semigroup r) => LensLike' ((,) r) s r -> r -> m r
(<<>~) :: Semigroup m => LensLike ((,) m) s t m m -> m -> s -> (m, t)
(<<~) :: MonadState s m => ALens s s a b -> m b -> m b
(<<<>=) :: (MonadState s m, Semigroup r) => LensLike' ((,) r) s r -> r -> m r
(<<&&=) :: MonadState s m => LensLike' ((,) Bool) s Bool -> Bool -> m Bool
(<<||=) :: MonadState s m => LensLike' ((,) Bool) s Bool -> Bool -> m Bool
(<<**=) :: (MonadState s m, Floating a) => LensLike' ((,) a) s a -> a -> m a
(<<^^=) :: (MonadState s m, Fractional a, Integral e) => LensLike' ((,) a) s a -> e -> m a
(<<^=) :: (MonadState s m, Num a, Integral e) => LensLike' ((,) a) s a -> e -> m a
(<<//=) :: (MonadState s m, Fractional a) => LensLike' ((,) a) s a -> a -> m a
(<<*=) :: (MonadState s m, Num a) => LensLike' ((,) a) s a -> a -> m a
(<<-=) :: (MonadState s m, Num a) => LensLike' ((,) a) s a -> a -> m a
(<<+=) :: (MonadState s m, Num a) => LensLike' ((,) a) s a -> a -> m a
(<<?=) :: MonadState s m => LensLike ((,) a) s s a (Maybe b) -> b -> m a
(<<.=) :: MonadState s m => LensLike ((,) a) s s a b -> b -> m a
(<<%=) :: (Strong p, MonadState s m) => Over p ((,) a) s s a b -> p a b -> m a
(<&&=) :: MonadState s m => LensLike' ((,) Bool) s Bool -> Bool -> m Bool
(<||=) :: MonadState s m => LensLike' ((,) Bool) s Bool -> Bool -> m Bool
(<**=) :: (MonadState s m, Floating a) => LensLike' ((,) a) s a -> a -> m a
(<^^=) :: (MonadState s m, Fractional a, Integral e) => LensLike' ((,) a) s a -> e -> m a
(<^=) :: (MonadState s m, Num a, Integral e) => LensLike' ((,) a) s a -> e -> m a
(<//=) :: (MonadState s m, Fractional a) => LensLike' ((,) a) s a -> a -> m a
(<*=) :: (MonadState s m, Num a) => LensLike' ((,) a) s a -> a -> m a
(<-=) :: (MonadState s m, Num a) => LensLike' ((,) a) s a -> a -> m a
(<+=) :: (MonadState s m, Num a) => LensLike' ((,) a) s a -> a -> m a
(<%=) :: MonadState s m => LensLike ((,) b) s s a b -> (a -> b) -> m b
(<<<>~) :: Semigroup r => LensLike' ((,) r) s r -> r -> s -> (r, s)
(<<&&~) :: LensLike' ((,) Bool) s Bool -> Bool -> s -> (Bool, s)
(<<||~) :: LensLike' ((,) Bool) s Bool -> Bool -> s -> (Bool, s)
(<<**~) :: Floating a => LensLike' ((,) a) s a -> a -> s -> (a, s)
(<<^^~) :: (Fractional a, Integral e) => LensLike' ((,) a) s a -> e -> s -> (a, s)
(<<^~) :: (Num a, Integral e) => LensLike' ((,) a) s a -> e -> s -> (a, s)
(<<//~) :: Fractional a => LensLike' ((,) a) s a -> a -> s -> (a, s)
(<<*~) :: Num a => LensLike' ((,) a) s a -> a -> s -> (a, s)
(<<-~) :: Num a => LensLike' ((,) a) s a -> a -> s -> (a, s)
(<<+~) :: Num a => LensLike' ((,) a) s a -> a -> s -> (a, s)
(<<?~) :: LensLike ((,) a) s t a (Maybe b) -> b -> s -> (a, t)
(<<.~) :: LensLike ((,) a) s t a b -> b -> s -> (a, t)
(<<%~) :: LensLike ((,) a) s t a b -> (a -> b) -> s -> (a, t)
(<&&~) :: LensLike ((,) Bool) s t Bool Bool -> Bool -> s -> (Bool, t)
(<||~) :: LensLike ((,) Bool) s t Bool Bool -> Bool -> s -> (Bool, t)
(<**~) :: Floating a => LensLike ((,) a) s t a a -> a -> s -> (a, t)
(<^^~) :: (Fractional a, Integral e) => LensLike ((,) a) s t a a -> e -> s -> (a, t)
(<^~) :: (Num a, Integral e) => LensLike ((,) a) s t a a -> e -> s -> (a, t)
(<//~) :: Fractional a => LensLike ((,) a) s t a a -> a -> s -> (a, t)
(<*~) :: Num a => LensLike ((,) a) s t a a -> a -> s -> (a, t)
(<-~) :: Num a => LensLike ((,) a) s t a a -> a -> s -> (a, t)
(<+~) :: Num a => LensLike ((,) a) s t a a -> a -> s -> (a, t)
(<%~) :: LensLike ((,) b) s t a b -> (a -> b) -> s -> (b, t)
cloneIndexedLens :: AnIndexedLens i s t a b -> IndexedLens i s t a b
cloneIndexPreservingLens :: ALens s t a b -> IndexPreservingLens s t a b
cloneLens :: ALens s t a b -> Lens s t a b
locus :: forall (p :: Type -> Type -> Type -> Type) a c s b. IndexedComonadStore p => Lens (p a c s) (p b c s) a b
alongside :: LensLike (AlongsideLeft f b') s t a b -> LensLike (AlongsideRight f t) s' t' a' b' -> LensLike f (s, s') (t, t') (a, a') (b, b')
chosen :: IndexPreservingLens (Either a a) (Either b b) a b
choosing :: Functor f => LensLike f s t a b -> LensLike f s' t' a b -> LensLike f (Either s s') (Either t t') a b
(??) :: Functor f => f (a -> b) -> a -> f b
(%%=) :: forall {k} s m p r (a :: k) b. MonadState s m => Over p ((,) r) s s a b -> p a (r, b) -> m r
(%%~) :: forall {k} f s (t :: k) a (b :: k). LensLike f s t a b -> (a -> f b) -> s -> f t
(&~) :: s -> State s a -> s
ilens :: (s -> (i, a)) -> (s -> b -> t) -> IndexedLens i s t a b
iplens :: (s -> a) -> (s -> b -> t) -> IndexPreservingLens s t a b
withLens :: forall s t a b (rep :: RuntimeRep) (r :: TYPE rep). ALens s t a b -> ((s -> a) -> (s -> b -> t) -> r) -> r
lens :: (s -> a) -> (s -> b -> t) -> Lens s t a b
type ALens s t a b = LensLike (Pretext (->) a b) s t a b
type ALens' s a = ALens s s a a
type AnIndexedLens i s t a b = Optical (Indexed i) (->) (Pretext (Indexed i) a b) s t a b
type AnIndexedLens' i s a = AnIndexedLens i s s a a
imapOf :: AnIndexedSetter i s t a b -> (i -> a -> b) -> s -> t
mapOf :: ASetter s t a b -> (a -> b) -> s -> t
assignA :: Arrow p => ASetter s t a b -> p s b -> p s t
(.@=) :: MonadState s m => AnIndexedSetter i s s a b -> (i -> b) -> m ()
imodifying :: MonadState s m => AnIndexedSetter i s s a b -> (i -> a -> b) -> m ()
(%@=) :: MonadState s m => AnIndexedSetter i s s a b -> (i -> a -> b) -> m ()
(.@~) :: AnIndexedSetter i s t a b -> (i -> b) -> s -> t
(%@~) :: AnIndexedSetter i s t a b -> (i -> a -> b) -> s -> t
isets :: ((i -> a -> b) -> s -> t) -> IndexedSetter i s t a b
iset :: AnIndexedSetter i s t a b -> (i -> b) -> s -> t
iover :: AnIndexedSetter i s t a b -> (i -> a -> b) -> s -> t
ilocally :: MonadReader s m => AnIndexedSetter i s s a b -> (i -> a -> b) -> m r -> m r
locally :: MonadReader s m => ASetter s s a b -> (a -> b) -> m r -> m r
icensoring :: MonadWriter w m => IndexedSetter i w w u v -> (i -> u -> v) -> m a -> m a
censoring :: MonadWriter w m => Setter w w u v -> (u -> v) -> m a -> m a
ipassing :: MonadWriter w m => IndexedSetter i w w u v -> m (a, i -> u -> v) -> m a
passing :: MonadWriter w m => Setter w w u v -> m (a, u -> v) -> m a
scribe :: (MonadWriter t m, Monoid s) => ASetter s t a b -> b -> m ()
(<>=) :: (MonadState s m, Semigroup a) => ASetter' s a -> a -> m ()
(<>~) :: Semigroup a => ASetter s t a a -> a -> s -> t
(<?=) :: MonadState s m => ASetter s s a (Maybe b) -> b -> m b
(<.=) :: MonadState s m => ASetter s s a b -> b -> m b
(<~) :: MonadState s m => ASetter s s a b -> m b -> m ()
(||=) :: MonadState s m => ASetter' s Bool -> Bool -> m ()
(&&=) :: MonadState s m => ASetter' s Bool -> Bool -> m ()
(**=) :: (MonadState s m, Floating a) => ASetter' s a -> a -> m ()
(^^=) :: (MonadState s m, Fractional a, Integral e) => ASetter' s a -> e -> m ()
(^=) :: (MonadState s m, Num a, Integral e) => ASetter' s a -> e -> m ()
(//=) :: (MonadState s m, Fractional a) => ASetter' s a -> a -> m ()
(*=) :: (MonadState s m, Num a) => ASetter' s a -> a -> m ()
(-=) :: (MonadState s m, Num a) => ASetter' s a -> a -> m ()
(+=) :: (MonadState s m, Num a) => ASetter' s a -> a -> m ()
(?=) :: MonadState s m => ASetter s s a (Maybe b) -> b -> m ()
modifying :: MonadState s m => ASetter s s a b -> (a -> b) -> m ()
(%=) :: MonadState s m => ASetter s s a b -> (a -> b) -> m ()
(.=) :: MonadState s m => ASetter s s a b -> b -> m ()
assign :: MonadState s m => ASetter s s a b -> b -> m ()
(&&~) :: ASetter s t Bool Bool -> Bool -> s -> t
(||~) :: ASetter s t Bool Bool -> Bool -> s -> t
(**~) :: Floating a => ASetter s t a a -> a -> s -> t
(^^~) :: (Fractional a, Integral e) => ASetter s t a a -> e -> s -> t
(^~) :: (Num a, Integral e) => ASetter s t a a -> e -> s -> t
(//~) :: Fractional a => ASetter s t a a -> a -> s -> t
(-~) :: Num a => ASetter s t a a -> a -> s -> t
(*~) :: Num a => ASetter s t a a -> a -> s -> t
(+~) :: Num a => ASetter s t a a -> a -> s -> t
(<?~) :: ASetter s t a (Maybe b) -> b -> s -> (b, t)
(<.~) :: ASetter s t a b -> b -> s -> (b, t)
(?~) :: ASetter s t a (Maybe b) -> b -> s -> t
(.~) :: ASetter s t a b -> b -> s -> t
(%~) :: ASetter s t a b -> (a -> b) -> s -> t
set' :: ASetter' s a -> a -> s -> s
set :: ASetter s t a b -> b -> s -> t
over :: ASetter s t a b -> (a -> b) -> s -> t
cloneIndexedSetter :: AnIndexedSetter i s t a b -> IndexedSetter i s t a b
cloneIndexPreservingSetter :: ASetter s t a b -> IndexPreservingSetter s t a b
cloneSetter :: ASetter s t a b -> Setter s t a b
sets :: (Profunctor p, Profunctor q, Settable f) => (p a b -> q s t) -> Optical p q f s t a b
setting :: ((a -> b) -> s -> t) -> IndexPreservingSetter s t a b
contramapped :: forall (f :: Type -> Type) b a. Contravariant f => Setter (f b) (f a) a b
lifted :: forall (m :: Type -> Type) a b. Monad m => Setter (m a) (m b) a b
mapped :: forall (f :: Type -> Type) a b. Functor f => Setter (f a) (f b) a b
type ASetter s t a b = (a -> Identity b) -> s -> Identity t
type ASetter' s a = ASetter s s a a
type AnIndexedSetter i s t a b = Indexed i a (Identity b) -> s -> Identity t
type AnIndexedSetter' i s a = AnIndexedSetter i s s a a
type Setting (p :: Type -> Type -> Type) s t a b = p a (Identity b) -> s -> Identity t
type Setting' (p :: Type -> Type -> Type) s a = Setting p s s a a
type Lens s t a b = forall (f :: Type -> Type). Functor f => (a -> f b) -> s -> f t
type Lens' s a = Lens s s a a
type IndexedLens i s t a b = forall (f :: Type -> Type) (p :: Type -> Type -> Type). (Indexable i p, Functor f) => p a (f b) -> s -> f t
type IndexedLens' i s a = IndexedLens i s s a a
type IndexPreservingLens s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Functor f) => p a (f b) -> p s (f t)
type IndexPreservingLens' s a = IndexPreservingLens s s a a
type Traversal s t a b = forall (f :: Type -> Type). Applicative f => (a -> f b) -> s -> f t
type Traversal' s a = Traversal s s a a
type Traversal1 s t a b = forall (f :: Type -> Type). Apply f => (a -> f b) -> s -> f t
type Traversal1' s a = Traversal1 s s a a
type IndexedTraversal i s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Indexable i p, Applicative f) => p a (f b) -> s -> f t
type IndexedTraversal' i s a = IndexedTraversal i s s a a
type IndexedTraversal1 i s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Indexable i p, Apply f) => p a (f b) -> s -> f t
type IndexedTraversal1' i s a = IndexedTraversal1 i s s a a
type IndexPreservingTraversal s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Applicative f) => p a (f b) -> p s (f t)
type IndexPreservingTraversal' s a = IndexPreservingTraversal s s a a
type IndexPreservingTraversal1 s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Apply f) => p a (f b) -> p s (f t)
type IndexPreservingTraversal1' s a = IndexPreservingTraversal1 s s a a
type Setter s t a b = forall (f :: Type -> Type). Settable f => (a -> f b) -> s -> f t
type Setter' s a = Setter s s a a
type IndexedSetter i s t a b = forall (f :: Type -> Type) (p :: Type -> Type -> Type). (Indexable i p, Settable f) => p a (f b) -> s -> f t
type IndexedSetter' i s a = IndexedSetter i s s a a
type IndexPreservingSetter s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Settable f) => p a (f b) -> p s (f t)
type IndexPreservingSetter' s a = IndexPreservingSetter s s a a
type Iso s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Profunctor p, Functor f) => p a (f b) -> p s (f t)
type Iso' s a = Iso s s a a
type Review t b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Choice p, Bifunctor p, Settable f) => Optic' p f t b
type AReview t b = Optic' (Tagged :: Type -> Type -> Type) Identity t b
type Prism s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Choice p, Applicative f) => p a (f b) -> p s (f t)
type Prism' s a = Prism s s a a
type Equality (s :: k1) (t :: k2) (a :: k1) (b :: k2) = forall k3 (p :: k1 -> k3 -> Type) (f :: k2 -> k3). p a (f b) -> p s (f t)
type Equality' (s :: k2) (a :: k2) = Equality s s a a
type As (a :: k2) = Equality' a a
type Getter s a = forall (f :: Type -> Type). (Contravariant f, Functor f) => (a -> f a) -> s -> f s
type IndexedGetter i s a = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Indexable i p, Contravariant f, Functor f) => p a (f a) -> s -> f s
type IndexPreservingGetter s a = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Contravariant f, Functor f) => p a (f a) -> p s (f s)
type Fold s a = forall (f :: Type -> Type). (Contravariant f, Applicative f) => (a -> f a) -> s -> f s
type IndexedFold i s a = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Indexable i p, Contravariant f, Applicative f) => p a (f a) -> s -> f s
type IndexPreservingFold s a = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Contravariant f, Applicative f) => p a (f a) -> p s (f s)
type Fold1 s a = forall (f :: Type -> Type). (Contravariant f, Apply f) => (a -> f a) -> s -> f s
type IndexedFold1 i s a = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Indexable i p, Contravariant f, Apply f) => p a (f a) -> s -> f s
type IndexPreservingFold1 s a = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Contravariant f, Apply f) => p a (f a) -> p s (f s)
type Simple (f :: k1 -> k1 -> k2 -> k2 -> k) (s :: k1) (a :: k2) = f s s a a
type Optic (p :: k -> k1 -> Type) (f :: k2 -> k1) (s :: k) (t :: k2) (a :: k) (b :: k2) = p a (f b) -> p s (f t)
type Optic' (p :: k -> k1 -> Type) (f :: k -> k1) (s :: k) (a :: k) = Optic p f s s a a
type Optical (p :: k -> k1 -> Type) (q :: k2 -> k1 -> Type) (f :: k3 -> k1) (s :: k2) (t :: k3) (a :: k) (b :: k3) = p a (f b) -> q s (f t)
type Optical' (p :: k -> k1 -> Type) (q :: k -> k1 -> Type) (f :: k -> k1) (s :: k) (a :: k) = Optical p q f s s a a
type LensLike (f :: k -> Type) s (t :: k) a (b :: k) = (a -> f b) -> s -> f t
type LensLike' (f :: Type -> Type) s a = LensLike f s s a a
type IndexedLensLike i (f :: k -> Type) s (t :: k) a (b :: k) = forall (p :: Type -> Type -> Type). Indexable i p => p a (f b) -> s -> f t
type IndexedLensLike' i (f :: Type -> Type) s a = IndexedLensLike i f s s a a
type Over (p :: k -> Type -> Type) (f :: k1 -> Type) s (t :: k1) (a :: k) (b :: k1) = p a (f b) -> s -> f t
type Over' (p :: Type -> Type -> Type) (f :: Type -> Type) s a = Over p f s s a a
class (Applicative f, Distributive f, Traversable f) => Settable (f :: Type -> Type)
retagged :: (Profunctor p, Bifunctor p) => p a b -> p s b
class (Profunctor p, Bifunctor p) => Reviewable (p :: Type -> Type -> Type)
data Magma i t b a
newtype Bazaar (p :: Type -> Type -> Type) a b t = Bazaar {
- runBazaar :: forall (f :: Type -> Type). Applicative f => p a (f b) -> f t
}
type Bazaar' (p :: Type -> Type -> Type) a = Bazaar p a a
newtype Bazaar1 (p :: Type -> Type -> Type) a b t = Bazaar1 {
- runBazaar1 :: forall (f :: Type -> Type). Apply f => p a (f b) -> f t
}
type Bazaar1' (p :: Type -> Type -> Type) a = Bazaar1 p a a
data Context a b t = Context (b -> t) a
type Context' a = Context a a
data Traversed a (f :: Type -> Type)
data Sequenced a (m :: Type -> Type)
data Leftmost a
data Rightmost a
asIndex :: (Indexable i p, Contravariant f, Functor f) => p i (f i) -> Indexed i s (f s)
withIndex :: (Indexable i p, Functor f) => p (i, s) (f (j, t)) -> Indexed i s (f t)
indexing64 :: Indexable Int64 p => ((a -> Indexing64 f b) -> s -> Indexing64 f t) -> p a (f b) -> s -> f t
indexing :: Indexable Int p => ((a -> Indexing f b) -> s -> Indexing f t) -> p a (f b) -> s -> f t
class (Choice p, Corepresentable p, Comonad (Corep p), Traversable (Corep p), Strong p, Representable p, Monad (Rep p), MonadFix (Rep p), Distributive (Rep p), Costrong p, ArrowLoop p, ArrowApply p, ArrowChoice p, Closed p) => Conjoined (p :: Type -> Type -> Type) where
- distrib :: Functor f => p a b -> p (f a) (f b)
- conjoined :: (p ~ (->) => q (a -> b) r) -> q (p a b) r -> q (p a b) r
class Conjoined p => Indexable i (p :: Type -> Type -> Type)
newtype Indexed i a b = Indexed {
- runIndexed :: i -> a -> b
}
data Level i a
class Reversing t where
- reversing :: t -> t
class (Foldable1 t, Traversable t) => Traversable1 (t :: TYPE LiftedRep -> Type) where
- traverse1 :: Apply f => (a -> f b) -> t a -> f (t b)
foldBy :: Foldable t => (a -> a -> a) -> a -> t a -> a
foldMapBy :: Foldable t => (r -> r -> r) -> r -> (a -> r) -> t a -> r
traverseBy :: Traversable t => (forall x. x -> f x) -> (forall x y. f (x -> y) -> f x -> f y) -> (a -> f b) -> t a -> f (t b)
sequenceBy :: Traversable t => (forall x. x -> f x) -> (forall x y. f (x -> y) -> f x -> f y) -> t (f a) -> f (t a)
class Profunctor p => Choice (p :: Type -> Type -> Type) where
- left' :: p a b -> p (Either a c) (Either b c)
- right' :: p a b -> p (Either c a) (Either c b)
class Functor f => Applicative (f :: Type -> Type) where
- pure :: a -> f a
- (<*>) :: f (a -> b) -> f a -> f b
- liftA2 :: (a -> b -> c) -> f a -> f b -> f c
- (*>) :: f a -> f b -> f b
- (<*) :: f a -> f b -> f a
(*>) :: Applicative f => f a -> f b -> f b
(<*) :: Applicative f => f a -> f b -> f a
(<$>) :: Functor f => (a -> b) -> f a -> f b
(<$) :: Functor f => a -> f b -> f a
liftA :: Applicative f => (a -> b) -> f a -> f b
liftA2 :: Applicative f => (a -> b -> c) -> f a -> f b -> f c
liftA3 :: Applicative f => (a -> b -> c -> d) -> f a -> f b -> f c -> f d

Diagrams library

Exports from this library for working with diagrams.

module Diagrams

Convenience re-exports from other packages

For working with default values. Diagrams also exports with, an alias for def.

module Data.Default.Class

For representing and operating on colors.

alphaChannel :: AlphaColour a -> a #

Returns the opacity of an AlphaColour.

blend :: (Num a, AffineSpace f) => a -> f a -> f a -> f a #

Compute the weighted average of two points. e.g.

blend 0.4 a b = 0.4*a + 0.6*b

The weight can be negative, or greater than 1.0; however, be aware that non-convex combinations may lead to out of gamut colours.

withOpacity :: Num a => Colour a -> a -> AlphaColour a #

Creates an AlphaColour from a Colour with a given opacity.

c `withOpacity` o == dissolve o (opaque c)

dissolve :: Num a => a -> AlphaColour a -> AlphaColour a #

Returns an AlphaColour more transparent by a factor of o.

opaque :: Num a => Colour a -> AlphaColour a #

Creates an opaque AlphaColour from a Colour.

alphaColourConvert :: (Fractional b, Real a) => AlphaColour a -> AlphaColour b #

Change the type used to represent the colour coordinates.

transparent :: Num a => AlphaColour a #

This AlphaColour is entirely transparent and has no associated colour channel.

black :: Num a => Colour a #

colourConvert :: (Fractional b, Real a) => Colour a -> Colour b #

Change the type used to represent the colour coordinates.

data Colour a #

This type represents the human preception of colour. The a parameter is a numeric type used internally for the representation.

The Monoid instance allows one to add colours, but beware that adding colours can take you out of gamut. Consider using blend whenever possible.

Instances

Instances details

AffineSpace Colour
Instance details Defined in Data.Colour.Internal Methods affineCombo :: Num a => [(a, Colour a)] -> Colour a -> Colour a #
ColourOps Colour
Instance details Defined in Data.Colour.Internal Methods over :: Num a => AlphaColour a -> Colour a -> Colour a # darken :: Num a => a -> Colour a -> Colour a #
Num a => Monoid (Colour a)
Instance details Defined in Data.Colour.Internal Methods mempty :: Colour a # mappend :: Colour a -> Colour a -> Colour a # mconcat :: [Colour a] -> Colour a #
Num a => Semigroup (Colour a)
Instance details Defined in Data.Colour.Internal Methods (<>) :: Colour a -> Colour a -> Colour a # sconcat :: NonEmpty (Colour a) -> Colour a # stimes :: Integral b => b -> Colour a -> Colour a #
a ~ Double => Color (Colour a) Source #
Instance details Defined in Diagrams.Attributes Methods toAlphaColour :: Colour a -> AlphaColour Double Source # fromAlphaColour :: AlphaColour Double -> Colour a Source #
Parseable (Colour Double) Source #	Parse `Colour Double` as either a named color from Data.Colour.Names or a hexadecimal color.
Instance details Defined in Diagrams.Backend.CmdLine Methods parser :: Parser (Colour Double) Source #
Eq a => Eq (Colour a)
Instance details Defined in Data.Colour.Internal Methods (==) :: Colour a -> Colour a -> Bool # (/=) :: Colour a -> Colour a -> Bool #

data AlphaColour a #

This type represents a Colour that may be semi-transparent.

The Monoid instance allows you to composite colours.

x `mappend` y == x `over` y

To get the (pre-multiplied) colour channel of an AlphaColour c, simply composite c over black.

c `over` black

Instances

Instances details

AffineSpace AlphaColour
Instance details Defined in Data.Colour.Internal Methods affineCombo :: Num a => [(a, AlphaColour a)] -> AlphaColour a -> AlphaColour a #
ColourOps AlphaColour
Instance details Defined in Data.Colour.Internal Methods over :: Num a => AlphaColour a -> AlphaColour a -> AlphaColour a # darken :: Num a => a -> AlphaColour a -> AlphaColour a #
Num a => Monoid (AlphaColour a)
Instance details Defined in Data.Colour.Internal Methods mempty :: AlphaColour a # mappend :: AlphaColour a -> AlphaColour a -> AlphaColour a # mconcat :: [AlphaColour a] -> AlphaColour a #
Num a => Semigroup (AlphaColour a)	`AlphaColour` forms a monoid with `over` and `transparent`.
Instance details Defined in Data.Colour.Internal Methods (<>) :: AlphaColour a -> AlphaColour a -> AlphaColour a # sconcat :: NonEmpty (AlphaColour a) -> AlphaColour a # stimes :: Integral b => b -> AlphaColour a -> AlphaColour a #
a ~ Double => Color (AlphaColour a) Source #
Instance details Defined in Diagrams.Attributes Methods toAlphaColour :: AlphaColour a -> AlphaColour Double Source # fromAlphaColour :: AlphaColour Double -> AlphaColour a Source #
Parseable (AlphaColour Double) Source #	Parse `AlphaColour Double` as either a named color from Data.Colour.Names or a hexadecimal color.
Instance details Defined in Diagrams.Backend.CmdLine Methods parser :: Parser (AlphaColour Double) Source #
Eq a => Eq (AlphaColour a)
Instance details Defined in Data.Colour.Internal Methods (==) :: AlphaColour a -> AlphaColour a -> Bool # (/=) :: AlphaColour a -> AlphaColour a -> Bool #

class ColourOps (f :: Type -> Type) where #

Minimal complete definition

over, darken

Methods

darken :: Num a => a -> f a -> f a #

darken s c blends a colour with black without changing it's opacity.

For Colour, darken s c = blend s c mempty

Instances

Instances details

ColourOps AlphaColour
Instance details Defined in Data.Colour.Internal Methods over :: Num a => AlphaColour a -> AlphaColour a -> AlphaColour a # darken :: Num a => a -> AlphaColour a -> AlphaColour a #
ColourOps Colour
Instance details Defined in Data.Colour.Internal Methods over :: Num a => AlphaColour a -> Colour a -> Colour a # darken :: Num a => a -> Colour a -> Colour a #

A large list of color names.

yellowgreen :: (Ord a, Floating a) => Colour a #

yellow :: (Ord a, Floating a) => Colour a #

whitesmoke :: (Ord a, Floating a) => Colour a #

white :: (Ord a, Floating a) => Colour a #

wheat :: (Ord a, Floating a) => Colour a #

violet :: (Ord a, Floating a) => Colour a #

turquoise :: (Ord a, Floating a) => Colour a #

tomato :: (Ord a, Floating a) => Colour a #

thistle :: (Ord a, Floating a) => Colour a #

teal :: (Ord a, Floating a) => Colour a #

steelblue :: (Ord a, Floating a) => Colour a #

springgreen :: (Ord a, Floating a) => Colour a #

snow :: (Ord a, Floating a) => Colour a #

slategrey :: (Ord a, Floating a) => Colour a #

slategray :: (Ord a, Floating a) => Colour a #

slateblue :: (Ord a, Floating a) => Colour a #

skyblue :: (Ord a, Floating a) => Colour a #

silver :: (Ord a, Floating a) => Colour a #

sienna :: (Ord a, Floating a) => Colour a #

seashell :: (Ord a, Floating a) => Colour a #

seagreen :: (Ord a, Floating a) => Colour a #

sandybrown :: (Ord a, Floating a) => Colour a #

salmon :: (Ord a, Floating a) => Colour a #

saddlebrown :: (Ord a, Floating a) => Colour a #

royalblue :: (Ord a, Floating a) => Colour a #

rosybrown :: (Ord a, Floating a) => Colour a #

red :: (Ord a, Floating a) => Colour a #

purple :: (Ord a, Floating a) => Colour a #

powderblue :: (Ord a, Floating a) => Colour a #

plum :: (Ord a, Floating a) => Colour a #

pink :: (Ord a, Floating a) => Colour a #

peru :: (Ord a, Floating a) => Colour a #

peachpuff :: (Ord a, Floating a) => Colour a #

papayawhip :: (Ord a, Floating a) => Colour a #

palevioletred :: (Ord a, Floating a) => Colour a #

paleturquoise :: (Ord a, Floating a) => Colour a #

palegreen :: (Ord a, Floating a) => Colour a #

palegoldenrod :: (Ord a, Floating a) => Colour a #

orchid :: (Ord a, Floating a) => Colour a #

orangered :: (Ord a, Floating a) => Colour a #

orange :: (Ord a, Floating a) => Colour a #

olivedrab :: (Ord a, Floating a) => Colour a #

olive :: (Ord a, Floating a) => Colour a #

oldlace :: (Ord a, Floating a) => Colour a #

navy :: (Ord a, Floating a) => Colour a #

navajowhite :: (Ord a, Floating a) => Colour a #

moccasin :: (Ord a, Floating a) => Colour a #

mistyrose :: (Ord a, Floating a) => Colour a #

mintcream :: (Ord a, Floating a) => Colour a #

midnightblue :: (Ord a, Floating a) => Colour a #

mediumvioletred :: (Ord a, Floating a) => Colour a #

mediumturquoise :: (Ord a, Floating a) => Colour a #

mediumspringgreen :: (Ord a, Floating a) => Colour a #

mediumslateblue :: (Ord a, Floating a) => Colour a #

mediumseagreen :: (Ord a, Floating a) => Colour a #

mediumpurple :: (Ord a, Floating a) => Colour a #

mediumorchid :: (Ord a, Floating a) => Colour a #

mediumblue :: (Ord a, Floating a) => Colour a #

mediumaquamarine :: (Ord a, Floating a) => Colour a #

maroon :: (Ord a, Floating a) => Colour a #

magenta :: (Ord a, Floating a) => Colour a #

linen :: (Ord a, Floating a) => Colour a #

limegreen :: (Ord a, Floating a) => Colour a #

lime :: (Ord a, Floating a) => Colour a #

lightyellow :: (Ord a, Floating a) => Colour a #

lightsteelblue :: (Ord a, Floating a) => Colour a #

lightslategrey :: (Ord a, Floating a) => Colour a #

lightslategray :: (Ord a, Floating a) => Colour a #

lightskyblue :: (Ord a, Floating a) => Colour a #

lightseagreen :: (Ord a, Floating a) => Colour a #

lightsalmon :: (Ord a, Floating a) => Colour a #

lightpink :: (Ord a, Floating a) => Colour a #

lightgrey :: (Ord a, Floating a) => Colour a #

lightgreen :: (Ord a, Floating a) => Colour a #

lightgray :: (Ord a, Floating a) => Colour a #

lightgoldenrodyellow :: (Ord a, Floating a) => Colour a #

lightcyan :: (Ord a, Floating a) => Colour a #

lightcoral :: (Ord a, Floating a) => Colour a #

lightblue :: (Ord a, Floating a) => Colour a #

lemonchiffon :: (Ord a, Floating a) => Colour a #

lawngreen :: (Ord a, Floating a) => Colour a #

lavenderblush :: (Ord a, Floating a) => Colour a #

lavender :: (Ord a, Floating a) => Colour a #

khaki :: (Ord a, Floating a) => Colour a #

ivory :: (Ord a, Floating a) => Colour a #

indigo :: (Ord a, Floating a) => Colour a #

indianred :: (Ord a, Floating a) => Colour a #

hotpink :: (Ord a, Floating a) => Colour a #

honeydew :: (Ord a, Floating a) => Colour a #

greenyellow :: (Ord a, Floating a) => Colour a #

green :: (Ord a, Floating a) => Colour a #

grey :: (Ord a, Floating a) => Colour a #

gray :: (Ord a, Floating a) => Colour a #

goldenrod :: (Ord a, Floating a) => Colour a #

gold :: (Ord a, Floating a) => Colour a #

ghostwhite :: (Ord a, Floating a) => Colour a #

gainsboro :: (Ord a, Floating a) => Colour a #

fuchsia :: (Ord a, Floating a) => Colour a #

forestgreen :: (Ord a, Floating a) => Colour a #

floralwhite :: (Ord a, Floating a) => Colour a #

firebrick :: (Ord a, Floating a) => Colour a #

dodgerblue :: (Ord a, Floating a) => Colour a #

dimgrey :: (Ord a, Floating a) => Colour a #

dimgray :: (Ord a, Floating a) => Colour a #

deepskyblue :: (Ord a, Floating a) => Colour a #

deeppink :: (Ord a, Floating a) => Colour a #

darkviolet :: (Ord a, Floating a) => Colour a #

darkturquoise :: (Ord a, Floating a) => Colour a #

darkslategrey :: (Ord a, Floating a) => Colour a #

darkslategray :: (Ord a, Floating a) => Colour a #

darkslateblue :: (Ord a, Floating a) => Colour a #

darkseagreen :: (Ord a, Floating a) => Colour a #

darksalmon :: (Ord a, Floating a) => Colour a #

darkred :: (Ord a, Floating a) => Colour a #

darkorchid :: (Ord a, Floating a) => Colour a #

darkorange :: (Ord a, Floating a) => Colour a #

darkolivegreen :: (Ord a, Floating a) => Colour a #

darkmagenta :: (Ord a, Floating a) => Colour a #

darkkhaki :: (Ord a, Floating a) => Colour a #

darkgrey :: (Ord a, Floating a) => Colour a #

darkgreen :: (Ord a, Floating a) => Colour a #

darkgray :: (Ord a, Floating a) => Colour a #

darkgoldenrod :: (Ord a, Floating a) => Colour a #

darkcyan :: (Ord a, Floating a) => Colour a #

darkblue :: (Ord a, Floating a) => Colour a #

cyan :: (Ord a, Floating a) => Colour a #

crimson :: (Ord a, Floating a) => Colour a #

cornsilk :: (Ord a, Floating a) => Colour a #

cornflowerblue :: (Ord a, Floating a) => Colour a #

coral :: (Ord a, Floating a) => Colour a #

chocolate :: (Ord a, Floating a) => Colour a #

chartreuse :: (Ord a, Floating a) => Colour a #

cadetblue :: (Ord a, Floating a) => Colour a #

burlywood :: (Ord a, Floating a) => Colour a #

brown :: (Ord a, Floating a) => Colour a #

blueviolet :: (Ord a, Floating a) => Colour a #

blue :: (Ord a, Floating a) => Colour a #

blanchedalmond :: (Ord a, Floating a) => Colour a #

bisque :: (Ord a, Floating a) => Colour a #

beige :: (Ord a, Floating a) => Colour a #

azure :: (Ord a, Floating a) => Colour a #

aquamarine :: (Ord a, Floating a) => Colour a #

aqua :: (Ord a, Floating a) => Colour a #

antiquewhite :: (Ord a, Floating a) => Colour a #

aliceblue :: (Ord a, Floating a) => Colour a #

readColourName :: (MonadFail m, Monad m, Ord a, Floating a) => String -> m (Colour a) #

black :: Num a => Colour a #

Specify your own colours.

module Data.Colour.SRGB

Semigroups and monoids show up all over the place, so things from Data.Semigroup and Data.Monoid often come in handy.

module Data.Semigroup

For computing with vectors.

module Linear.Vector

For computing with points and vectors.

module Linear.Affine

For computing with dot products and norm.

module Linear.Metric

For working with Active (i.e. animated) things.

module Data.Active

Most of the lens package. The following functions are not exported from lens because they either conflict with diagrams or may conflict with other libraries:

class (Functor t, Foldable t) => Traversable (t :: Type -> Type) where #

Functors representing data structures that can be transformed to structures of the same shape by performing an Applicative (or, therefore, Monad) action on each element from left to right.

A more detailed description of what same shape means, the various methods, how traversals are constructed, and example advanced use-cases can be found in the Overview section of Data.Traversable.

For the class laws see the Laws section of Data.Traversable.

Minimal complete definition

traverse | sequenceA

Methods

traverse :: Applicative f => (a -> f b) -> t a -> f (t b) #

Map each element of a structure to an action, evaluate these actions from left to right, and collect the results. For a version that ignores the results see traverse_.

Examples

Expand

Basic usage:

In the first two examples we show each evaluated action mapping to the output structure.

>>> traverse Just [1,2,3,4]
Just [1,2,3,4]

>>> traverse id [Right 1, Right 2, Right 3, Right 4]
Right [1,2,3,4]

In the next examples, we show that Nothing and Left values short circuit the created structure.

>>> traverse (const Nothing) [1,2,3,4]
Nothing

>>> traverse (\x -> if odd x then Just x else Nothing)  [1,2,3,4]
Nothing

>>> traverse id [Right 1, Right 2, Right 3, Right 4, Left 0]
Left 0

Instances

Instances details

Traversable ZipList	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> ZipList a -> f (ZipList b) # sequenceA :: Applicative f => ZipList (f a) -> f (ZipList a) # mapM :: Monad m => (a -> m b) -> ZipList a -> m (ZipList b) # sequence :: Monad m => ZipList (m a) -> m (ZipList a) #
Traversable Complex	Since: base-4.9.0.0
Instance details Defined in Data.Complex Methods traverse :: Applicative f => (a -> f b) -> Complex a -> f (Complex b) # sequenceA :: Applicative f => Complex (f a) -> f (Complex a) # mapM :: Monad m => (a -> m b) -> Complex a -> m (Complex b) # sequence :: Monad m => Complex (m a) -> m (Complex a) #
Traversable Identity	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Identity a -> f (Identity b) # sequenceA :: Applicative f => Identity (f a) -> f (Identity a) # mapM :: Monad m => (a -> m b) -> Identity a -> m (Identity b) # sequence :: Monad m => Identity (m a) -> m (Identity a) #
Traversable First	Since: base-4.8.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> First a -> f (First b) # sequenceA :: Applicative f => First (f a) -> f (First a) # mapM :: Monad m => (a -> m b) -> First a -> m (First b) # sequence :: Monad m => First (m a) -> m (First a) #
Traversable Last	Since: base-4.8.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Last a -> f (Last b) # sequenceA :: Applicative f => Last (f a) -> f (Last a) # mapM :: Monad m => (a -> m b) -> Last a -> m (Last b) # sequence :: Monad m => Last (m a) -> m (Last a) #
Traversable Down	Since: base-4.12.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Down a -> f (Down b) # sequenceA :: Applicative f => Down (f a) -> f (Down a) # mapM :: Monad m => (a -> m b) -> Down a -> m (Down b) # sequence :: Monad m => Down (m a) -> m (Down a) #
Traversable First	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods traverse :: Applicative f => (a -> f b) -> First a -> f (First b) # sequenceA :: Applicative f => First (f a) -> f (First a) # mapM :: Monad m => (a -> m b) -> First a -> m (First b) # sequence :: Monad m => First (m a) -> m (First a) #
Traversable Last	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods traverse :: Applicative f => (a -> f b) -> Last a -> f (Last b) # sequenceA :: Applicative f => Last (f a) -> f (Last a) # mapM :: Monad m => (a -> m b) -> Last a -> m (Last b) # sequence :: Monad m => Last (m a) -> m (Last a) #
Traversable Max	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods traverse :: Applicative f => (a -> f b) -> Max a -> f (Max b) # sequenceA :: Applicative f => Max (f a) -> f (Max a) # mapM :: Monad m => (a -> m b) -> Max a -> m (Max b) # sequence :: Monad m => Max (m a) -> m (Max a) #
Traversable Min	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods traverse :: Applicative f => (a -> f b) -> Min a -> f (Min b) # sequenceA :: Applicative f => Min (f a) -> f (Min a) # mapM :: Monad m => (a -> m b) -> Min a -> m (Min b) # sequence :: Monad m => Min (m a) -> m (Min a) #
Traversable Dual	Since: base-4.8.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Dual a -> f (Dual b) # sequenceA :: Applicative f => Dual (f a) -> f (Dual a) # mapM :: Monad m => (a -> m b) -> Dual a -> m (Dual b) # sequence :: Monad m => Dual (m a) -> m (Dual a) #
Traversable Product	Since: base-4.8.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Product a -> f (Product b) # sequenceA :: Applicative f => Product (f a) -> f (Product a) # mapM :: Monad m => (a -> m b) -> Product a -> m (Product b) # sequence :: Monad m => Product (m a) -> m (Product a) #
Traversable Sum	Since: base-4.8.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Sum a -> f (Sum b) # sequenceA :: Applicative f => Sum (f a) -> f (Sum a) # mapM :: Monad m => (a -> m b) -> Sum a -> m (Sum b) # sequence :: Monad m => Sum (m a) -> m (Sum a) #
Traversable Par1	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Par1 a -> f (Par1 b) # sequenceA :: Applicative f => Par1 (f a) -> f (Par1 a) # mapM :: Monad m => (a -> m b) -> Par1 a -> m (Par1 b) # sequence :: Monad m => Par1 (m a) -> m (Par1 a) #
Traversable IntMap	Traverses in order of increasing key.
Instance details Defined in Data.IntMap.Internal Methods traverse :: Applicative f => (a -> f b) -> IntMap a -> f (IntMap b) # sequenceA :: Applicative f => IntMap (f a) -> f (IntMap a) # mapM :: Monad m => (a -> m b) -> IntMap a -> m (IntMap b) # sequence :: Monad m => IntMap (m a) -> m (IntMap a) #
Traversable Digit
Instance details Defined in Data.Sequence.Internal Methods traverse :: Applicative f => (a -> f b) -> Digit a -> f (Digit b) # sequenceA :: Applicative f => Digit (f a) -> f (Digit a) # mapM :: Monad m => (a -> m b) -> Digit a -> m (Digit b) # sequence :: Monad m => Digit (m a) -> m (Digit a) #
Traversable Elem
Instance details Defined in Data.Sequence.Internal Methods traverse :: Applicative f => (a -> f b) -> Elem a -> f (Elem b) # sequenceA :: Applicative f => Elem (f a) -> f (Elem a) # mapM :: Monad m => (a -> m b) -> Elem a -> m (Elem b) # sequence :: Monad m => Elem (m a) -> m (Elem a) #
Traversable FingerTree
Instance details Defined in Data.Sequence.Internal Methods traverse :: Applicative f => (a -> f b) -> FingerTree a -> f (FingerTree b) # sequenceA :: Applicative f => FingerTree (f a) -> f (FingerTree a) # mapM :: Monad m => (a -> m b) -> FingerTree a -> m (FingerTree b) # sequence :: Monad m => FingerTree (m a) -> m (FingerTree a) #
Traversable Node
Instance details Defined in Data.Sequence.Internal Methods traverse :: Applicative f => (a -> f b) -> Node a -> f (Node b) # sequenceA :: Applicative f => Node (f a) -> f (Node a) # mapM :: Monad m => (a -> m b) -> Node a -> m (Node b) # sequence :: Monad m => Node (m a) -> m (Node a) #
Traversable Seq
Instance details Defined in Data.Sequence.Internal Methods traverse :: Applicative f => (a -> f b) -> Seq a -> f (Seq b) # sequenceA :: Applicative f => Seq (f a) -> f (Seq a) # mapM :: Monad m => (a -> m b) -> Seq a -> m (Seq b) # sequence :: Monad m => Seq (m a) -> m (Seq a) #
Traversable ViewL
Instance details Defined in Data.Sequence.Internal Methods traverse :: Applicative f => (a -> f b) -> ViewL a -> f (ViewL b) # sequenceA :: Applicative f => ViewL (f a) -> f (ViewL a) # mapM :: Monad m => (a -> m b) -> ViewL a -> m (ViewL b) # sequence :: Monad m => ViewL (m a) -> m (ViewL a) #
Traversable ViewR
Instance details Defined in Data.Sequence.Internal Methods traverse :: Applicative f => (a -> f b) -> ViewR a -> f (ViewR b) # sequenceA :: Applicative f => ViewR (f a) -> f (ViewR a) # mapM :: Monad m => (a -> m b) -> ViewR a -> m (ViewR b) # sequence :: Monad m => ViewR (m a) -> m (ViewR a) #
Traversable Tree
Instance details Defined in Data.Tree Methods traverse :: Applicative f => (a -> f b) -> Tree a -> f (Tree b) # sequenceA :: Applicative f => Tree (f a) -> f (Tree a) # mapM :: Monad m => (a -> m b) -> Tree a -> m (Tree b) # sequence :: Monad m => Tree (m a) -> m (Tree a) #
Traversable Interval
Instance details Defined in Numeric.Interval.Kaucher Methods traverse :: Applicative f => (a -> f b) -> Interval a -> f (Interval b) # sequenceA :: Applicative f => Interval (f a) -> f (Interval a) # mapM :: Monad m => (a -> m b) -> Interval a -> m (Interval b) # sequence :: Monad m => Interval (m a) -> m (Interval a) #
Traversable Plucker
Instance details Defined in Linear.Plucker Methods traverse :: Applicative f => (a -> f b) -> Plucker a -> f (Plucker b) # sequenceA :: Applicative f => Plucker (f a) -> f (Plucker a) # mapM :: Monad m => (a -> m b) -> Plucker a -> m (Plucker b) # sequence :: Monad m => Plucker (m a) -> m (Plucker a) #
Traversable Quaternion
Instance details Defined in Linear.Quaternion Methods traverse :: Applicative f => (a -> f b) -> Quaternion a -> f (Quaternion b) # sequenceA :: Applicative f => Quaternion (f a) -> f (Quaternion a) # mapM :: Monad m => (a -> m b) -> Quaternion a -> m (Quaternion b) # sequence :: Monad m => Quaternion (m a) -> m (Quaternion a) #
Traversable V0
Instance details Defined in Linear.V0 Methods traverse :: Applicative f => (a -> f b) -> V0 a -> f (V0 b) # sequenceA :: Applicative f => V0 (f a) -> f (V0 a) # mapM :: Monad m => (a -> m b) -> V0 a -> m (V0 b) # sequence :: Monad m => V0 (m a) -> m (V0 a) #
Traversable V1
Instance details Defined in Linear.V1 Methods traverse :: Applicative f => (a -> f b) -> V1 a -> f (V1 b) # sequenceA :: Applicative f => V1 (f a) -> f (V1 a) # mapM :: Monad m => (a -> m b) -> V1 a -> m (V1 b) # sequence :: Monad m => V1 (m a) -> m (V1 a) #
Traversable V2
Instance details Defined in Linear.V2 Methods traverse :: Applicative f => (a -> f b) -> V2 a -> f (V2 b) # sequenceA :: Applicative f => V2 (f a) -> f (V2 a) # mapM :: Monad m => (a -> m b) -> V2 a -> m (V2 b) # sequence :: Monad m => V2 (m a) -> m (V2 a) #
Traversable V3
Instance details Defined in Linear.V3 Methods traverse :: Applicative f => (a -> f b) -> V3 a -> f (V3 b) # sequenceA :: Applicative f => V3 (f a) -> f (V3 a) # mapM :: Monad m => (a -> m b) -> V3 a -> m (V3 b) # sequence :: Monad m => V3 (m a) -> m (V3 a) #
Traversable V4
Instance details Defined in Linear.V4 Methods traverse :: Applicative f => (a -> f b) -> V4 a -> f (V4 b) # sequenceA :: Applicative f => V4 (f a) -> f (V4 a) # mapM :: Monad m => (a -> m b) -> V4 a -> m (V4 b) # sequence :: Monad m => V4 (m a) -> m (V4 a) #
Traversable Deletable
Instance details Defined in Data.Monoid.Deletable Methods traverse :: Applicative f => (a -> f b) -> Deletable a -> f (Deletable b) # sequenceA :: Applicative f => Deletable (f a) -> f (Deletable a) # mapM :: Monad m => (a -> m b) -> Deletable a -> m (Deletable b) # sequence :: Monad m => Deletable (m a) -> m (Deletable a) #
Traversable Recommend
Instance details Defined in Data.Monoid.Recommend Methods traverse :: Applicative f => (a -> f b) -> Recommend a -> f (Recommend b) # sequenceA :: Applicative f => Recommend (f a) -> f (Recommend a) # mapM :: Monad m => (a -> m b) -> Recommend a -> m (Recommend b) # sequence :: Monad m => Recommend (m a) -> m (Recommend a) #
Traversable Split
Instance details Defined in Data.Monoid.Split Methods traverse :: Applicative f => (a -> f b) -> Split a -> f (Split b) # sequenceA :: Applicative f => Split (f a) -> f (Split a) # mapM :: Monad m => (a -> m b) -> Split a -> m (Split b) # sequence :: Monad m => Split (m a) -> m (Split a) #
Traversable Array
Instance details Defined in Data.Primitive.Array Methods traverse :: Applicative f => (a -> f b) -> Array a -> f (Array b) # sequenceA :: Applicative f => Array (f a) -> f (Array a) # mapM :: Monad m => (a -> m b) -> Array a -> m (Array b) # sequence :: Monad m => Array (m a) -> m (Array a) #
Traversable SmallArray
Instance details Defined in Data.Primitive.SmallArray Methods traverse :: Applicative f => (a -> f b) -> SmallArray a -> f (SmallArray b) # sequenceA :: Applicative f => SmallArray (f a) -> f (SmallArray a) # mapM :: Monad m => (a -> m b) -> SmallArray a -> m (SmallArray b) # sequence :: Monad m => SmallArray (m a) -> m (SmallArray a) #
Traversable Maybe
Instance details Defined in Data.Strict.Maybe Methods traverse :: Applicative f => (a -> f b) -> Maybe a -> f (Maybe b) # sequenceA :: Applicative f => Maybe (f a) -> f (Maybe a) # mapM :: Monad m => (a -> m b) -> Maybe a -> m (Maybe b) # sequence :: Monad m => Maybe (m a) -> m (Maybe a) #
Traversable Vector
Instance details Defined in Data.Vector Methods traverse :: Applicative f => (a -> f b) -> Vector a -> f (Vector b) # sequenceA :: Applicative f => Vector (f a) -> f (Vector a) # mapM :: Monad m => (a -> m b) -> Vector a -> m (Vector b) # sequence :: Monad m => Vector (m a) -> m (Vector a) #
Traversable NonEmpty	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> NonEmpty a -> f (NonEmpty b) # sequenceA :: Applicative f => NonEmpty (f a) -> f (NonEmpty a) # mapM :: Monad m => (a -> m b) -> NonEmpty a -> m (NonEmpty b) # sequence :: Monad m => NonEmpty (m a) -> m (NonEmpty a) #
Traversable Maybe	Since: base-2.1
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Maybe a -> f (Maybe b) # sequenceA :: Applicative f => Maybe (f a) -> f (Maybe a) # mapM :: Monad m => (a -> m b) -> Maybe a -> m (Maybe b) # sequence :: Monad m => Maybe (m a) -> m (Maybe a) #
Traversable Solo	Since: base-4.15
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Solo a -> f (Solo b) # sequenceA :: Applicative f => Solo (f a) -> f (Solo a) # mapM :: Monad m => (a -> m b) -> Solo a -> m (Solo b) # sequence :: Monad m => Solo (m a) -> m (Solo a) #
Traversable []	Since: base-2.1
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> [a] -> f [b] # sequenceA :: Applicative f => [f a] -> f [a] # mapM :: Monad m => (a -> m b) -> [a] -> m [b] # sequence :: Monad m => [m a] -> m [a] #
Traversable (Either a)	Since: base-4.7.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a0 -> f b) -> Either a a0 -> f (Either a b) # sequenceA :: Applicative f => Either a (f a0) -> f (Either a a0) # mapM :: Monad m => (a0 -> m b) -> Either a a0 -> m (Either a b) # sequence :: Monad m => Either a (m a0) -> m (Either a a0) #
Traversable (Proxy :: Type -> Type)	Since: base-4.7.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Proxy a -> f (Proxy b) # sequenceA :: Applicative f => Proxy (f a) -> f (Proxy a) # mapM :: Monad m => (a -> m b) -> Proxy a -> m (Proxy b) # sequence :: Monad m => Proxy (m a) -> m (Proxy a) #
Traversable (Arg a)	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods traverse :: Applicative f => (a0 -> f b) -> Arg a a0 -> f (Arg a b) # sequenceA :: Applicative f => Arg a (f a0) -> f (Arg a a0) # mapM :: Monad m => (a0 -> m b) -> Arg a a0 -> m (Arg a b) # sequence :: Monad m => Arg a (m a0) -> m (Arg a a0) #
Ix i => Traversable (Array i)	Since: base-2.1
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Array i a -> f (Array i b) # sequenceA :: Applicative f => Array i (f a) -> f (Array i a) # mapM :: Monad m => (a -> m b) -> Array i a -> m (Array i b) # sequence :: Monad m => Array i (m a) -> m (Array i a) #
Traversable (U1 :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> U1 a -> f (U1 b) # sequenceA :: Applicative f => U1 (f a) -> f (U1 a) # mapM :: Monad m => (a -> m b) -> U1 a -> m (U1 b) # sequence :: Monad m => U1 (m a) -> m (U1 a) #
Traversable (UAddr :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> UAddr a -> f (UAddr b) # sequenceA :: Applicative f => UAddr (f a) -> f (UAddr a) # mapM :: Monad m => (a -> m b) -> UAddr a -> m (UAddr b) # sequence :: Monad m => UAddr (m a) -> m (UAddr a) #
Traversable (UChar :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> UChar a -> f (UChar b) # sequenceA :: Applicative f => UChar (f a) -> f (UChar a) # mapM :: Monad m => (a -> m b) -> UChar a -> m (UChar b) # sequence :: Monad m => UChar (m a) -> m (UChar a) #
Traversable (UDouble :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> UDouble a -> f (UDouble b) # sequenceA :: Applicative f => UDouble (f a) -> f (UDouble a) # mapM :: Monad m => (a -> m b) -> UDouble a -> m (UDouble b) # sequence :: Monad m => UDouble (m a) -> m (UDouble a) #
Traversable (UFloat :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> UFloat a -> f (UFloat b) # sequenceA :: Applicative f => UFloat (f a) -> f (UFloat a) # mapM :: Monad m => (a -> m b) -> UFloat a -> m (UFloat b) # sequence :: Monad m => UFloat (m a) -> m (UFloat a) #
Traversable (UInt :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> UInt a -> f (UInt b) # sequenceA :: Applicative f => UInt (f a) -> f (UInt a) # mapM :: Monad m => (a -> m b) -> UInt a -> m (UInt b) # sequence :: Monad m => UInt (m a) -> m (UInt a) #
Traversable (UWord :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> UWord a -> f (UWord b) # sequenceA :: Applicative f => UWord (f a) -> f (UWord a) # mapM :: Monad m => (a -> m b) -> UWord a -> m (UWord b) # sequence :: Monad m => UWord (m a) -> m (UWord a) #
Traversable (V1 :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> V1 a -> f (V1 b) # sequenceA :: Applicative f => V1 (f a) -> f (V1 a) # mapM :: Monad m => (a -> m b) -> V1 a -> m (V1 b) # sequence :: Monad m => V1 (m a) -> m (V1 a) #
Traversable (Map k)	Traverses in order of increasing key.
Instance details Defined in Data.Map.Internal Methods traverse :: Applicative f => (a -> f b) -> Map k a -> f (Map k b) # sequenceA :: Applicative f => Map k (f a) -> f (Map k a) # mapM :: Monad m => (a -> m b) -> Map k a -> m (Map k b) # sequence :: Monad m => Map k (m a) -> m (Map k a) #
(Monad m, Traversable m) => Traversable (CatchT m)
Instance details Defined in Control.Monad.Catch.Pure Methods traverse :: Applicative f => (a -> f b) -> CatchT m a -> f (CatchT m b) # sequenceA :: Applicative f => CatchT m (f a) -> f (CatchT m a) # mapM :: Monad m0 => (a -> m0 b) -> CatchT m a -> m0 (CatchT m b) # sequence :: Monad m0 => CatchT m (m0 a) -> m0 (CatchT m a) #
Traversable f => Traversable (Cofree f)
Instance details Defined in Control.Comonad.Cofree Methods traverse :: Applicative f0 => (a -> f0 b) -> Cofree f a -> f0 (Cofree f b) # sequenceA :: Applicative f0 => Cofree f (f0 a) -> f0 (Cofree f a) # mapM :: Monad m => (a -> m b) -> Cofree f a -> m (Cofree f b) # sequence :: Monad m => Cofree f (m a) -> m (Cofree f a) #
Traversable w => Traversable (CoiterT w)
Instance details Defined in Control.Comonad.Trans.Coiter Methods traverse :: Applicative f => (a -> f b) -> CoiterT w a -> f (CoiterT w b) # sequenceA :: Applicative f => CoiterT w (f a) -> f (CoiterT w a) # mapM :: Monad m => (a -> m b) -> CoiterT w a -> m (CoiterT w b) # sequence :: Monad m => CoiterT w (m a) -> m (CoiterT w a) #
Traversable f => Traversable (Free f)
Instance details Defined in Control.Monad.Free Methods traverse :: Applicative f0 => (a -> f0 b) -> Free f a -> f0 (Free f b) # sequenceA :: Applicative f0 => Free f (f0 a) -> f0 (Free f a) # mapM :: Monad m => (a -> m b) -> Free f a -> m (Free f b) # sequence :: Monad m => Free f (m a) -> m (Free f a) #
(Monad m, Traversable m) => Traversable (IterT m)
Instance details Defined in Control.Monad.Trans.Iter Methods traverse :: Applicative f => (a -> f b) -> IterT m a -> f (IterT m b) # sequenceA :: Applicative f => IterT m (f a) -> f (IterT m a) # mapM :: Monad m0 => (a -> m0 b) -> IterT m a -> m0 (IterT m b) # sequence :: Monad m0 => IterT m (m0 a) -> m0 (IterT m a) #
Traversable f => Traversable (Yoneda f)
Instance details Defined in Data.Functor.Yoneda Methods traverse :: Applicative f0 => (a -> f0 b) -> Yoneda f a -> f0 (Yoneda f b) # sequenceA :: Applicative f0 => Yoneda f (f0 a) -> f0 (Yoneda f a) # mapM :: Monad m => (a -> m b) -> Yoneda f a -> m (Yoneda f b) # sequence :: Monad m => Yoneda f (m a) -> m (Yoneda f a) #
Traversable (Level i)
Instance details Defined in Control.Lens.Internal.Level Methods traverse :: Applicative f => (a -> f b) -> Level i a -> f (Level i b) # sequenceA :: Applicative f => Level i (f a) -> f (Level i a) # mapM :: Monad m => (a -> m b) -> Level i a -> m (Level i b) # sequence :: Monad m => Level i (m a) -> m (Level i a) #
Traversable f => Traversable (Point f)
Instance details Defined in Linear.Affine Methods traverse :: Applicative f0 => (a -> f0 b) -> Point f a -> f0 (Point f b) # sequenceA :: Applicative f0 => Point f (f0 a) -> f0 (Point f a) # mapM :: Monad m => (a -> m b) -> Point f a -> m (Point f b) # sequence :: Monad m => Point f (m a) -> m (Point f a) #
Traversable (Inf p)
Instance details Defined in Data.Monoid.Inf Methods traverse :: Applicative f => (a -> f b) -> Inf p a -> f (Inf p b) # sequenceA :: Applicative f => Inf p (f a) -> f (Inf p a) # mapM :: Monad m => (a -> m b) -> Inf p a -> m (Inf p b) # sequence :: Monad m => Inf p (m a) -> m (Inf p a) #
Traversable (Either e)
Instance details Defined in Data.Strict.Either Methods traverse :: Applicative f => (a -> f b) -> Either e a -> f (Either e b) # sequenceA :: Applicative f => Either e (f a) -> f (Either e a) # mapM :: Monad m => (a -> m b) -> Either e a -> m (Either e b) # sequence :: Monad m => Either e (m a) -> m (Either e a) #
Traversable (These a)
Instance details Defined in Data.Strict.These Methods traverse :: Applicative f => (a0 -> f b) -> These a a0 -> f (These a b) # sequenceA :: Applicative f => These a (f a0) -> f (These a a0) # mapM :: Monad m => (a0 -> m b) -> These a a0 -> m (These a b) # sequence :: Monad m => These a (m a0) -> m (These a a0) #
Traversable (Pair e)
Instance details Defined in Data.Strict.Tuple Methods traverse :: Applicative f => (a -> f b) -> Pair e a -> f (Pair e b) # sequenceA :: Applicative f => Pair e (f a) -> f (Pair e a) # mapM :: Monad m => (a -> m b) -> Pair e a -> m (Pair e b) # sequence :: Monad m => Pair e (m a) -> m (Pair e a) #
Traversable (These a)
Instance details Defined in Data.These Methods traverse :: Applicative f => (a0 -> f b) -> These a a0 -> f (These a b) # sequenceA :: Applicative f => These a (f a0) -> f (These a a0) # mapM :: Monad m => (a0 -> m b) -> These a a0 -> m (These a b) # sequence :: Monad m => These a (m a0) -> m (These a a0) #
Traversable f => Traversable (ListT f)
Instance details Defined in Control.Monad.Trans.List Methods traverse :: Applicative f0 => (a -> f0 b) -> ListT f a -> f0 (ListT f b) # sequenceA :: Applicative f0 => ListT f (f0 a) -> f0 (ListT f a) # mapM :: Monad m => (a -> m b) -> ListT f a -> m (ListT f b) # sequence :: Monad m => ListT f (m a) -> m (ListT f a) #
Traversable f => Traversable (MaybeT f)
Instance details Defined in Control.Monad.Trans.Maybe Methods traverse :: Applicative f0 => (a -> f0 b) -> MaybeT f a -> f0 (MaybeT f b) # sequenceA :: Applicative f0 => MaybeT f (f0 a) -> f0 (MaybeT f a) # mapM :: Monad m => (a -> m b) -> MaybeT f a -> m (MaybeT f b) # sequence :: Monad m => MaybeT f (m a) -> m (MaybeT f a) #
Traversable (HashMap k)
Instance details Defined in Data.HashMap.Internal Methods traverse :: Applicative f => (a -> f b) -> HashMap k a -> f (HashMap k b) # sequenceA :: Applicative f => HashMap k (f a) -> f (HashMap k a) # mapM :: Monad m => (a -> m b) -> HashMap k a -> m (HashMap k b) # sequence :: Monad m => HashMap k (m a) -> m (HashMap k a) #
Traversable ((,) a)	Since: base-4.7.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a0 -> f b) -> (a, a0) -> f (a, b) # sequenceA :: Applicative f => (a, f a0) -> f (a, a0) # mapM :: Monad m => (a0 -> m b) -> (a, a0) -> m (a, b) # sequence :: Monad m => (a, m a0) -> m (a, a0) #
Traversable (Const m :: Type -> Type)	Since: base-4.7.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Const m a -> f (Const m b) # sequenceA :: Applicative f => Const m (f a) -> f (Const m a) # mapM :: Monad m0 => (a -> m0 b) -> Const m a -> m0 (Const m b) # sequence :: Monad m0 => Const m (m0 a) -> m0 (Const m a) #
Traversable f => Traversable (Ap f)	Since: base-4.12.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f0 => (a -> f0 b) -> Ap f a -> f0 (Ap f b) # sequenceA :: Applicative f0 => Ap f (f0 a) -> f0 (Ap f a) # mapM :: Monad m => (a -> m b) -> Ap f a -> m (Ap f b) # sequence :: Monad m => Ap f (m a) -> m (Ap f a) #
Traversable f => Traversable (Alt f)	Since: base-4.12.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f0 => (a -> f0 b) -> Alt f a -> f0 (Alt f b) # sequenceA :: Applicative f0 => Alt f (f0 a) -> f0 (Alt f a) # mapM :: Monad m => (a -> m b) -> Alt f a -> m (Alt f b) # sequence :: Monad m => Alt f (m a) -> m (Alt f a) #
Traversable f => Traversable (Rec1 f)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f0 => (a -> f0 b) -> Rec1 f a -> f0 (Rec1 f b) # sequenceA :: Applicative f0 => Rec1 f (f0 a) -> f0 (Rec1 f a) # mapM :: Monad m => (a -> m b) -> Rec1 f a -> m (Rec1 f b) # sequence :: Monad m => Rec1 f (m a) -> m (Rec1 f a) #
Bitraversable p => Traversable (Fix p)
Instance details Defined in Data.Bifunctor.Fix Methods traverse :: Applicative f => (a -> f b) -> Fix p a -> f (Fix p b) # sequenceA :: Applicative f => Fix p (f a) -> f (Fix p a) # mapM :: Monad m => (a -> m b) -> Fix p a -> m (Fix p b) # sequence :: Monad m => Fix p (m a) -> m (Fix p a) #
Bitraversable p => Traversable (Join p)
Instance details Defined in Data.Bifunctor.Join Methods traverse :: Applicative f => (a -> f b) -> Join p a -> f (Join p b) # sequenceA :: Applicative f => Join p (f a) -> f (Join p a) # mapM :: Monad m => (a -> m b) -> Join p a -> m (Join p b) # sequence :: Monad m => Join p (m a) -> m (Join p a) #
Traversable f => Traversable (CofreeF f a)
Instance details Defined in Control.Comonad.Trans.Cofree Methods traverse :: Applicative f0 => (a0 -> f0 b) -> CofreeF f a a0 -> f0 (CofreeF f a b) # sequenceA :: Applicative f0 => CofreeF f a (f0 a0) -> f0 (CofreeF f a a0) # mapM :: Monad m => (a0 -> m b) -> CofreeF f a a0 -> m (CofreeF f a b) # sequence :: Monad m => CofreeF f a (m a0) -> m (CofreeF f a a0) #
(Traversable f, Traversable w) => Traversable (CofreeT f w)
Instance details Defined in Control.Comonad.Trans.Cofree Methods traverse :: Applicative f0 => (a -> f0 b) -> CofreeT f w a -> f0 (CofreeT f w b) # sequenceA :: Applicative f0 => CofreeT f w (f0 a) -> f0 (CofreeT f w a) # mapM :: Monad m => (a -> m b) -> CofreeT f w a -> m (CofreeT f w b) # sequence :: Monad m => CofreeT f w (m a) -> m (CofreeT f w a) #
Traversable f => Traversable (FreeF f a)
Instance details Defined in Control.Monad.Trans.Free Methods traverse :: Applicative f0 => (a0 -> f0 b) -> FreeF f a a0 -> f0 (FreeF f a b) # sequenceA :: Applicative f0 => FreeF f a (f0 a0) -> f0 (FreeF f a a0) # mapM :: Monad m => (a0 -> m b) -> FreeF f a a0 -> m (FreeF f a b) # sequence :: Monad m => FreeF f a (m a0) -> m (FreeF f a a0) #
(Monad m, Traversable m, Traversable f) => Traversable (FreeT f m)
Instance details Defined in Control.Monad.Trans.Free Methods traverse :: Applicative f0 => (a -> f0 b) -> FreeT f m a -> f0 (FreeT f m b) # sequenceA :: Applicative f0 => FreeT f m (f0 a) -> f0 (FreeT f m a) # mapM :: Monad m0 => (a -> m0 b) -> FreeT f m a -> m0 (FreeT f m b) # sequence :: Monad m0 => FreeT f m (m0 a) -> m0 (FreeT f m a) #
Traversable f => Traversable (AlongsideLeft f b)
Instance details Defined in Control.Lens.Internal.Getter Methods traverse :: Applicative f0 => (a -> f0 b0) -> AlongsideLeft f b a -> f0 (AlongsideLeft f b b0) # sequenceA :: Applicative f0 => AlongsideLeft f b (f0 a) -> f0 (AlongsideLeft f b a) # mapM :: Monad m => (a -> m b0) -> AlongsideLeft f b a -> m (AlongsideLeft f b b0) # sequence :: Monad m => AlongsideLeft f b (m a) -> m (AlongsideLeft f b a) #
Traversable f => Traversable (AlongsideRight f a)
Instance details Defined in Control.Lens.Internal.Getter Methods traverse :: Applicative f0 => (a0 -> f0 b) -> AlongsideRight f a a0 -> f0 (AlongsideRight f a b) # sequenceA :: Applicative f0 => AlongsideRight f a (f0 a0) -> f0 (AlongsideRight f a a0) # mapM :: Monad m => (a0 -> m b) -> AlongsideRight f a a0 -> m (AlongsideRight f a b) # sequence :: Monad m => AlongsideRight f a (m a0) -> m (AlongsideRight f a a0) #
Traversable (V n)
Instance details Defined in Linear.V Methods traverse :: Applicative f => (a -> f b) -> V n a -> f (V n b) # sequenceA :: Applicative f => V n (f a) -> f (V n a) # mapM :: Monad m => (a -> m b) -> V n a -> m (V n b) # sequence :: Monad m => V n (m a) -> m (V n a) #
Traversable (Tagged s)
Instance details Defined in Data.Tagged Methods traverse :: Applicative f => (a -> f b) -> Tagged s a -> f (Tagged s b) # sequenceA :: Applicative f => Tagged s (f a) -> f (Tagged s a) # mapM :: Monad m => (a -> m b) -> Tagged s a -> m (Tagged s b) # sequence :: Monad m => Tagged s (m a) -> m (Tagged s a) #
Traversable f => Traversable (Backwards f)	Derived instance.
Instance details Defined in Control.Applicative.Backwards Methods traverse :: Applicative f0 => (a -> f0 b) -> Backwards f a -> f0 (Backwards f b) # sequenceA :: Applicative f0 => Backwards f (f0 a) -> f0 (Backwards f a) # mapM :: Monad m => (a -> m b) -> Backwards f a -> m (Backwards f b) # sequence :: Monad m => Backwards f (m a) -> m (Backwards f a) #
Traversable f => Traversable (ErrorT e f)
Instance details Defined in Control.Monad.Trans.Error Methods traverse :: Applicative f0 => (a -> f0 b) -> ErrorT e f a -> f0 (ErrorT e f b) # sequenceA :: Applicative f0 => ErrorT e f (f0 a) -> f0 (ErrorT e f a) # mapM :: Monad m => (a -> m b) -> ErrorT e f a -> m (ErrorT e f b) # sequence :: Monad m => ErrorT e f (m a) -> m (ErrorT e f a) #
Traversable f => Traversable (ExceptT e f)
Instance details Defined in Control.Monad.Trans.Except Methods traverse :: Applicative f0 => (a -> f0 b) -> ExceptT e f a -> f0 (ExceptT e f b) # sequenceA :: Applicative f0 => ExceptT e f (f0 a) -> f0 (ExceptT e f a) # mapM :: Monad m => (a -> m b) -> ExceptT e f a -> m (ExceptT e f b) # sequence :: Monad m => ExceptT e f (m a) -> m (ExceptT e f a) #
Traversable f => Traversable (IdentityT f)
Instance details Defined in Control.Monad.Trans.Identity Methods traverse :: Applicative f0 => (a -> f0 b) -> IdentityT f a -> f0 (IdentityT f b) # sequenceA :: Applicative f0 => IdentityT f (f0 a) -> f0 (IdentityT f a) # mapM :: Monad m => (a -> m b) -> IdentityT f a -> m (IdentityT f b) # sequence :: Monad m => IdentityT f (m a) -> m (IdentityT f a) #
Traversable f => Traversable (WriterT w f)
Instance details Defined in Control.Monad.Trans.Writer.Lazy Methods traverse :: Applicative f0 => (a -> f0 b) -> WriterT w f a -> f0 (WriterT w f b) # sequenceA :: Applicative f0 => WriterT w f (f0 a) -> f0 (WriterT w f a) # mapM :: Monad m => (a -> m b) -> WriterT w f a -> m (WriterT w f b) # sequence :: Monad m => WriterT w f (m a) -> m (WriterT w f a) #
Traversable f => Traversable (WriterT w f)
Instance details Defined in Control.Monad.Trans.Writer.Strict Methods traverse :: Applicative f0 => (a -> f0 b) -> WriterT w f a -> f0 (WriterT w f b) # sequenceA :: Applicative f0 => WriterT w f (f0 a) -> f0 (WriterT w f a) # mapM :: Monad m => (a -> m b) -> WriterT w f a -> m (WriterT w f b) # sequence :: Monad m => WriterT w f (m a) -> m (WriterT w f a) #
Traversable (Constant a :: Type -> Type)
Instance details Defined in Data.Functor.Constant Methods traverse :: Applicative f => (a0 -> f b) -> Constant a a0 -> f (Constant a b) # sequenceA :: Applicative f => Constant a (f a0) -> f (Constant a a0) # mapM :: Monad m => (a0 -> m b) -> Constant a a0 -> m (Constant a b) # sequence :: Monad m => Constant a (m a0) -> m (Constant a a0) #
Traversable f => Traversable (Reverse f)	Traverse from right to left.
Instance details Defined in Data.Functor.Reverse Methods traverse :: Applicative f0 => (a -> f0 b) -> Reverse f a -> f0 (Reverse f b) # sequenceA :: Applicative f0 => Reverse f (f0 a) -> f0 (Reverse f a) # mapM :: Monad m => (a -> m b) -> Reverse f a -> m (Reverse f b) # sequence :: Monad m => Reverse f (m a) -> m (Reverse f a) #
(Traversable f, Traversable g) => Traversable (Product f g)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Product Methods traverse :: Applicative f0 => (a -> f0 b) -> Product f g a -> f0 (Product f g b) # sequenceA :: Applicative f0 => Product f g (f0 a) -> f0 (Product f g a) # mapM :: Monad m => (a -> m b) -> Product f g a -> m (Product f g b) # sequence :: Monad m => Product f g (m a) -> m (Product f g a) #
(Traversable f, Traversable g) => Traversable (Sum f g)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Sum Methods traverse :: Applicative f0 => (a -> f0 b) -> Sum f g a -> f0 (Sum f g b) # sequenceA :: Applicative f0 => Sum f g (f0 a) -> f0 (Sum f g a) # mapM :: Monad m => (a -> m b) -> Sum f g a -> m (Sum f g b) # sequence :: Monad m => Sum f g (m a) -> m (Sum f g a) #
(Traversable f, Traversable g) => Traversable (f :*: g)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f0 => (a -> f0 b) -> (f :: g) a -> f0 ((f :: g) b) # sequenceA :: Applicative f0 => (f :: g) (f0 a) -> f0 ((f :: g) a) # mapM :: Monad m => (a -> m b) -> (f :: g) a -> m ((f :: g) b) # sequence :: Monad m => (f :: g) (m a) -> m ((f :: g) a) #
(Traversable f, Traversable g) => Traversable (f :+: g)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f0 => (a -> f0 b) -> (f :+: g) a -> f0 ((f :+: g) b) # sequenceA :: Applicative f0 => (f :+: g) (f0 a) -> f0 ((f :+: g) a) # mapM :: Monad m => (a -> m b) -> (f :+: g) a -> m ((f :+: g) b) # sequence :: Monad m => (f :+: g) (m a) -> m ((f :+: g) a) #
Traversable (K1 i c :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> K1 i c a -> f (K1 i c b) # sequenceA :: Applicative f => K1 i c (f a) -> f (K1 i c a) # mapM :: Monad m => (a -> m b) -> K1 i c a -> m (K1 i c b) # sequence :: Monad m => K1 i c (m a) -> m (K1 i c a) #
Traversable (Magma i t b)
Instance details Defined in Control.Lens.Internal.Magma Methods traverse :: Applicative f => (a -> f b0) -> Magma i t b a -> f (Magma i t b b0) # sequenceA :: Applicative f => Magma i t b (f a) -> f (Magma i t b a) # mapM :: Monad m => (a -> m b0) -> Magma i t b a -> m (Magma i t b b0) # sequence :: Monad m => Magma i t b (m a) -> m (Magma i t b a) #
Traversable (Forget r a :: Type -> TYPE LiftedRep)
Instance details Defined in Data.Profunctor.Types Methods traverse :: Applicative f => (a0 -> f b) -> Forget r a a0 -> f (Forget r a b) # sequenceA :: Applicative f => Forget r a (f a0) -> f (Forget r a a0) # mapM :: Monad m => (a0 -> m b) -> Forget r a a0 -> m (Forget r a b) # sequence :: Monad m => Forget r a (m a0) -> m (Forget r a a0) #
(Traversable f, Traversable g) => Traversable (Compose f g)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Compose Methods traverse :: Applicative f0 => (a -> f0 b) -> Compose f g a -> f0 (Compose f g b) # sequenceA :: Applicative f0 => Compose f g (f0 a) -> f0 (Compose f g a) # mapM :: Monad m => (a -> m b) -> Compose f g a -> m (Compose f g b) # sequence :: Monad m => Compose f g (m a) -> m (Compose f g a) #
(Traversable f, Traversable g) => Traversable (f :.: g)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f0 => (a -> f0 b) -> (f :.: g) a -> f0 ((f :.: g) b) # sequenceA :: Applicative f0 => (f :.: g) (f0 a) -> f0 ((f :.: g) a) # mapM :: Monad m => (a -> m b) -> (f :.: g) a -> m ((f :.: g) b) # sequence :: Monad m => (f :.: g) (m a) -> m ((f :.: g) a) #
Traversable f => Traversable (M1 i c f)	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f0 => (a -> f0 b) -> M1 i c f a -> f0 (M1 i c f b) # sequenceA :: Applicative f0 => M1 i c f (f0 a) -> f0 (M1 i c f a) # mapM :: Monad m => (a -> m b) -> M1 i c f a -> m (M1 i c f b) # sequence :: Monad m => M1 i c f (m a) -> m (M1 i c f a) #
Traversable (Clown f a :: Type -> Type)
Instance details Defined in Data.Bifunctor.Clown Methods traverse :: Applicative f0 => (a0 -> f0 b) -> Clown f a a0 -> f0 (Clown f a b) # sequenceA :: Applicative f0 => Clown f a (f0 a0) -> f0 (Clown f a a0) # mapM :: Monad m => (a0 -> m b) -> Clown f a a0 -> m (Clown f a b) # sequence :: Monad m => Clown f a (m a0) -> m (Clown f a a0) #
Bitraversable p => Traversable (Flip p a)
Instance details Defined in Data.Bifunctor.Flip Methods traverse :: Applicative f => (a0 -> f b) -> Flip p a a0 -> f (Flip p a b) # sequenceA :: Applicative f => Flip p a (f a0) -> f (Flip p a a0) # mapM :: Monad m => (a0 -> m b) -> Flip p a a0 -> m (Flip p a b) # sequence :: Monad m => Flip p a (m a0) -> m (Flip p a a0) #
Traversable g => Traversable (Joker g a)
Instance details Defined in Data.Bifunctor.Joker Methods traverse :: Applicative f => (a0 -> f b) -> Joker g a a0 -> f (Joker g a b) # sequenceA :: Applicative f => Joker g a (f a0) -> f (Joker g a a0) # mapM :: Monad m => (a0 -> m b) -> Joker g a a0 -> m (Joker g a b) # sequence :: Monad m => Joker g a (m a0) -> m (Joker g a a0) #
Bitraversable p => Traversable (WrappedBifunctor p a)
Instance details Defined in Data.Bifunctor.Wrapped Methods traverse :: Applicative f => (a0 -> f b) -> WrappedBifunctor p a a0 -> f (WrappedBifunctor p a b) # sequenceA :: Applicative f => WrappedBifunctor p a (f a0) -> f (WrappedBifunctor p a a0) # mapM :: Monad m => (a0 -> m b) -> WrappedBifunctor p a a0 -> m (WrappedBifunctor p a b) # sequence :: Monad m => WrappedBifunctor p a (m a0) -> m (WrappedBifunctor p a a0) #
(Traversable f, Bitraversable p) => Traversable (Tannen f p a)
Instance details Defined in Data.Bifunctor.Tannen Methods traverse :: Applicative f0 => (a0 -> f0 b) -> Tannen f p a a0 -> f0 (Tannen f p a b) # sequenceA :: Applicative f0 => Tannen f p a (f0 a0) -> f0 (Tannen f p a a0) # mapM :: Monad m => (a0 -> m b) -> Tannen f p a a0 -> m (Tannen f p a b) # sequence :: Monad m => Tannen f p a (m a0) -> m (Tannen f p a a0) #
(Bitraversable p, Traversable g) => Traversable (Biff p f g a)
Instance details Defined in Data.Bifunctor.Biff Methods traverse :: Applicative f0 => (a0 -> f0 b) -> Biff p f g a a0 -> f0 (Biff p f g a b) # sequenceA :: Applicative f0 => Biff p f g a (f0 a0) -> f0 (Biff p f g a a0) # mapM :: Monad m => (a0 -> m b) -> Biff p f g a a0 -> m (Biff p f g a b) # sequence :: Monad m => Biff p f g a (m a0) -> m (Biff p f g a a0) #

class Contravariant (f :: Type -> Type) where #

The class of contravariant functors.

Whereas in Haskell, one can think of a Functor as containing or producing values, a contravariant functor is a functor that can be thought of as consuming values.

As an example, consider the type of predicate functions a -> Bool. One such predicate might be negative x = x < 0, which classifies integers as to whether they are negative. However, given this predicate, we can re-use it in other situations, providing we have a way to map values to integers. For instance, we can use the negative predicate on a person's bank balance to work out if they are currently overdrawn:

newtype Predicate a = Predicate { getPredicate :: a -> Bool }

instance Contravariant Predicate where
  contramap :: (a' -> a) -> (Predicate a -> Predicate a')
  contramap f (Predicate p) = Predicate (p . f)
                                         |   `- First, map the input...
                                         `----- then apply the predicate.

overdrawn :: Predicate Person
overdrawn = contramap personBankBalance negative

Any instance should be subject to the following laws:

Identity: contramap id = id
Composition: contramap (g . f) = contramap f . contramap g

Note, that the second law follows from the free theorem of the type of contramap and the first law, so you need only check that the former condition holds.

Minimal complete definition

contramap

Methods

contramap :: (a' -> a) -> f a -> f a' #

(>$) :: b -> f b -> f a infixl 4 #

Replace all locations in the output with the same value. The default definition is contramap . const, but this may be overridden with a more efficient version.

Instances

Instances details

Contravariant Comparison	A `Comparison` is a `Contravariant` `Functor`, because `contramap` can apply its function argument to each input of the comparison function.
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> Comparison a -> Comparison a' # (>$) :: b -> Comparison b -> Comparison a #
Contravariant Equivalence	Equivalence relations are `Contravariant`, because you can apply the contramapped function to each input to the equivalence relation.
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> Equivalence a -> Equivalence a' # (>$) :: b -> Equivalence b -> Equivalence a #
Contravariant Predicate	A `Predicate` is a `Contravariant` `Functor`, because `contramap` can apply its function argument to the input of the predicate. Without newtypes `contramap f` equals precomposing with `f` (= `(. f)`). contramap :: (a' -> a) -> (Predicate a -> Predicate a') contramap f (Predicate g) = Predicate (g . f)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> Predicate a -> Predicate a' # (>$) :: b -> Predicate b -> Predicate a #
Contravariant (Op a)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a0) -> Op a a0 -> Op a a' # (>$) :: b -> Op a b -> Op a a0 #
Contravariant (Proxy :: Type -> Type)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> Proxy a -> Proxy a' # (>$) :: b -> Proxy b -> Proxy a #
Contravariant (U1 :: Type -> Type)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> U1 a -> U1 a' # (>$) :: b -> U1 b -> U1 a #
Contravariant (V1 :: Type -> Type)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> V1 a -> V1 a' # (>$) :: b -> V1 b -> V1 a #
Contravariant f => Contravariant (Indexing f)
Instance details Defined in Control.Lens.Internal.Indexed Methods contramap :: (a' -> a) -> Indexing f a -> Indexing f a' # (>$) :: b -> Indexing f b -> Indexing f a #
Contravariant f => Contravariant (Indexing64 f)
Instance details Defined in Control.Lens.Internal.Indexed Methods contramap :: (a' -> a) -> Indexing64 f a -> Indexing64 f a' # (>$) :: b -> Indexing64 f b -> Indexing64 f a #
Contravariant m => Contravariant (ListT m)
Instance details Defined in Control.Monad.Trans.List Methods contramap :: (a' -> a) -> ListT m a -> ListT m a' # (>$) :: b -> ListT m b -> ListT m a #
Contravariant m => Contravariant (MaybeT m)
Instance details Defined in Control.Monad.Trans.Maybe Methods contramap :: (a' -> a) -> MaybeT m a -> MaybeT m a' # (>$) :: b -> MaybeT m b -> MaybeT m a #
Contravariant (Const a :: Type -> Type)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a0) -> Const a a0 -> Const a a' # (>$) :: b -> Const a b -> Const a a0 #
Contravariant f => Contravariant (Alt f)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> Alt f a -> Alt f a' # (>$) :: b -> Alt f b -> Alt f a #
Contravariant f => Contravariant (Rec1 f)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> Rec1 f a -> Rec1 f a' # (>$) :: b -> Rec1 f b -> Rec1 f a #
(Contravariant f, Functor g) => Contravariant (ComposeCF f g)
Instance details Defined in Data.Functor.Contravariant.Compose Methods contramap :: (a' -> a) -> ComposeCF f g a -> ComposeCF f g a' # (>$) :: b -> ComposeCF f g b -> ComposeCF f g a #
(Functor f, Contravariant g) => Contravariant (ComposeFC f g)
Instance details Defined in Data.Functor.Contravariant.Compose Methods contramap :: (a' -> a) -> ComposeFC f g a -> ComposeFC f g a' # (>$) :: b -> ComposeFC f g b -> ComposeFC f g a #
Contravariant f => Contravariant (AlongsideLeft f b)
Instance details Defined in Control.Lens.Internal.Getter Methods contramap :: (a' -> a) -> AlongsideLeft f b a -> AlongsideLeft f b a' # (>$) :: b0 -> AlongsideLeft f b b0 -> AlongsideLeft f b a #
Contravariant f => Contravariant (AlongsideRight f a)
Instance details Defined in Control.Lens.Internal.Getter Methods contramap :: (a' -> a0) -> AlongsideRight f a a0 -> AlongsideRight f a a' # (>$) :: b -> AlongsideRight f a b -> AlongsideRight f a a0 #
Contravariant f => Contravariant (Backwards f)	Derived instance.
Instance details Defined in Control.Applicative.Backwards Methods contramap :: (a' -> a) -> Backwards f a -> Backwards f a' # (>$) :: b -> Backwards f b -> Backwards f a #
Contravariant m => Contravariant (ErrorT e m)
Instance details Defined in Control.Monad.Trans.Error Methods contramap :: (a' -> a) -> ErrorT e m a -> ErrorT e m a' # (>$) :: b -> ErrorT e m b -> ErrorT e m a #
Contravariant m => Contravariant (ExceptT e m)
Instance details Defined in Control.Monad.Trans.Except Methods contramap :: (a' -> a) -> ExceptT e m a -> ExceptT e m a' # (>$) :: b -> ExceptT e m b -> ExceptT e m a #
Contravariant f => Contravariant (IdentityT f)
Instance details Defined in Control.Monad.Trans.Identity Methods contramap :: (a' -> a) -> IdentityT f a -> IdentityT f a' # (>$) :: b -> IdentityT f b -> IdentityT f a #
Contravariant m => Contravariant (ReaderT r m)
Instance details Defined in Control.Monad.Trans.Reader Methods contramap :: (a' -> a) -> ReaderT r m a -> ReaderT r m a' # (>$) :: b -> ReaderT r m b -> ReaderT r m a #
Contravariant m => Contravariant (StateT s m)
Instance details Defined in Control.Monad.Trans.State.Lazy Methods contramap :: (a' -> a) -> StateT s m a -> StateT s m a' # (>$) :: b -> StateT s m b -> StateT s m a #
Contravariant m => Contravariant (StateT s m)
Instance details Defined in Control.Monad.Trans.State.Strict Methods contramap :: (a' -> a) -> StateT s m a -> StateT s m a' # (>$) :: b -> StateT s m b -> StateT s m a #
Contravariant m => Contravariant (WriterT w m)
Instance details Defined in Control.Monad.Trans.Writer.Lazy Methods contramap :: (a' -> a) -> WriterT w m a -> WriterT w m a' # (>$) :: b -> WriterT w m b -> WriterT w m a #
Contravariant m => Contravariant (WriterT w m)
Instance details Defined in Control.Monad.Trans.Writer.Strict Methods contramap :: (a' -> a) -> WriterT w m a -> WriterT w m a' # (>$) :: b -> WriterT w m b -> WriterT w m a #
Contravariant (Constant a :: Type -> Type)
Instance details Defined in Data.Functor.Constant Methods contramap :: (a' -> a0) -> Constant a a0 -> Constant a a' # (>$) :: b -> Constant a b -> Constant a a0 #
Contravariant f => Contravariant (Reverse f)	Derived instance.
Instance details Defined in Data.Functor.Reverse Methods contramap :: (a' -> a) -> Reverse f a -> Reverse f a' # (>$) :: b -> Reverse f b -> Reverse f a #
(Contravariant f, Contravariant g) => Contravariant (Product f g)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> Product f g a -> Product f g a' # (>$) :: b -> Product f g b -> Product f g a #
(Contravariant f, Contravariant g) => Contravariant (Sum f g)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> Sum f g a -> Sum f g a' # (>$) :: b -> Sum f g b -> Sum f g a #
(Contravariant f, Contravariant g) => Contravariant (f :*: g)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> (f :: g) a -> (f :: g) a' # (>$) :: b -> (f :: g) b -> (f :: g) a #
(Contravariant f, Contravariant g) => Contravariant (f :+: g)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> (f :+: g) a -> (f :+: g) a' # (>$) :: b -> (f :+: g) b -> (f :+: g) a #
Contravariant (K1 i c :: Type -> Type)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> K1 i c a -> K1 i c a' # (>$) :: b -> K1 i c b -> K1 i c a #
Contravariant (Forget r a :: Type -> TYPE LiftedRep)
Instance details Defined in Data.Profunctor.Types Methods contramap :: (a' -> a0) -> Forget r a a0 -> Forget r a a' # (>$) :: b -> Forget r a b -> Forget r a a0 #
Contravariant f => Contravariant (Star f a)
Instance details Defined in Data.Profunctor.Types Methods contramap :: (a' -> a0) -> Star f a a0 -> Star f a a' # (>$) :: b -> Star f a b -> Star f a a0 #
(Functor f, Contravariant g) => Contravariant (Compose f g)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> Compose f g a -> Compose f g a' # (>$) :: b -> Compose f g b -> Compose f g a #
(Functor f, Contravariant g) => Contravariant (f :.: g)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> (f :.: g) a -> (f :.: g) a' # (>$) :: b -> (f :.: g) b -> (f :.: g) a #
Contravariant f => Contravariant (M1 i c f)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a) -> M1 i c f a -> M1 i c f a' # (>$) :: b -> M1 i c f b -> M1 i c f a #
(Profunctor p, Contravariant g) => Contravariant (BazaarT p g a b)
Instance details Defined in Control.Lens.Internal.Bazaar Methods contramap :: (a' -> a0) -> BazaarT p g a b a0 -> BazaarT p g a b a' # (>$) :: b0 -> BazaarT p g a b b0 -> BazaarT p g a b a0 #
(Profunctor p, Contravariant g) => Contravariant (BazaarT1 p g a b)
Instance details Defined in Control.Lens.Internal.Bazaar Methods contramap :: (a' -> a0) -> BazaarT1 p g a b a0 -> BazaarT1 p g a b a' # (>$) :: b0 -> BazaarT1 p g a b b0 -> BazaarT1 p g a b a0 #
(Profunctor p, Contravariant g) => Contravariant (PretextT p g a b)
Instance details Defined in Control.Lens.Internal.Context Methods contramap :: (a' -> a0) -> PretextT p g a b a0 -> PretextT p g a b a' # (>$) :: b0 -> PretextT p g a b b0 -> PretextT p g a b a0 #
Contravariant f => Contravariant (TakingWhile p f a b)
Instance details Defined in Control.Lens.Internal.Magma Methods contramap :: (a' -> a0) -> TakingWhile p f a b a0 -> TakingWhile p f a b a' # (>$) :: b0 -> TakingWhile p f a b b0 -> TakingWhile p f a b a0 #
Contravariant m => Contravariant (RWST r w s m)
Instance details Defined in Control.Monad.Trans.RWS.Lazy Methods contramap :: (a' -> a) -> RWST r w s m a -> RWST r w s m a' # (>$) :: b -> RWST r w s m b -> RWST r w s m a #
Contravariant m => Contravariant (RWST r w s m)
Instance details Defined in Control.Monad.Trans.RWS.Strict Methods contramap :: (a' -> a) -> RWST r w s m a -> RWST r w s m a' # (>$) :: b -> RWST r w s m b -> RWST r w s m a #

class Bifunctor (p :: Type -> Type -> Type) where #

A bifunctor is a type constructor that takes two type arguments and is a functor in both arguments. That is, unlike with Functor, a type constructor such as Either does not need to be partially applied for a Bifunctor instance, and the methods in this class permit mapping functions over the Left value or the Right value, or both at the same time.

Formally, the class Bifunctor represents a bifunctor from Hask -> Hask.

Intuitively it is a bifunctor where both the first and second arguments are covariant.

You can define a Bifunctor by either defining bimap or by defining both first and second.

If you supply bimap, you should ensure that:

bimap id id ≡ id

If you supply first and second, ensure:

first id ≡ id
second id ≡ id

If you supply both, you should also ensure:

bimap f g ≡ first f . second g

These ensure by parametricity:

bimap  (f . g) (h . i) ≡ bimap f h . bimap g i
first  (f . g) ≡ first  f . first  g
second (f . g) ≡ second f . second g

Since: base-4.8.0.0

Minimal complete definition

bimap | first, second

Methods

bimap :: (a -> b) -> (c -> d) -> p a c -> p b d #

Map over both arguments at the same time.

bimap f g ≡ first f . second g

Examples

Expand

>>> bimap toUpper (+1) ('j', 3)
('J',4)

>>> bimap toUpper (+1) (Left 'j')
Left 'J'

>>> bimap toUpper (+1) (Right 3)
Right 4

Instances

Instances details

Bifunctor Either	Since: base-4.8.0.0
Instance details Defined in Data.Bifunctor Methods bimap :: (a -> b) -> (c -> d) -> Either a c -> Either b d # first :: (a -> b) -> Either a c -> Either b c # second :: (b -> c) -> Either a b -> Either a c #
Bifunctor Arg	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods bimap :: (a -> b) -> (c -> d) -> Arg a c -> Arg b d # first :: (a -> b) -> Arg a c -> Arg b c # second :: (b -> c) -> Arg a b -> Arg a c #
Bifunctor Either
Instance details Defined in Data.Strict.Either Methods bimap :: (a -> b) -> (c -> d) -> Either a c -> Either b d # first :: (a -> b) -> Either a c -> Either b c # second :: (b -> c) -> Either a b -> Either a c #
Bifunctor These
Instance details Defined in Data.Strict.These Methods bimap :: (a -> b) -> (c -> d) -> These a c -> These b d # first :: (a -> b) -> These a c -> These b c # second :: (b -> c) -> These a b -> These a c #
Bifunctor Pair
Instance details Defined in Data.Strict.Tuple Methods bimap :: (a -> b) -> (c -> d) -> Pair a c -> Pair b d # first :: (a -> b) -> Pair a c -> Pair b c # second :: (b -> c) -> Pair a b -> Pair a c #
Bifunctor These
Instance details Defined in Data.These Methods bimap :: (a -> b) -> (c -> d) -> These a c -> These b d # first :: (a -> b) -> These a c -> These b c # second :: (b -> c) -> These a b -> These a c #
Bifunctor (,)	Since: base-4.8.0.0
Instance details Defined in Data.Bifunctor Methods bimap :: (a -> b) -> (c -> d) -> (a, c) -> (b, d) # first :: (a -> b) -> (a, c) -> (b, c) # second :: (b -> c) -> (a, b) -> (a, c) #
Bifunctor (Const :: Type -> Type -> Type)	Since: base-4.8.0.0
Instance details Defined in Data.Bifunctor Methods bimap :: (a -> b) -> (c -> d) -> Const a c -> Const b d # first :: (a -> b) -> Const a c -> Const b c # second :: (b -> c) -> Const a b -> Const a c #
Functor f => Bifunctor (CofreeF f)
Instance details Defined in Control.Comonad.Trans.Cofree Methods bimap :: (a -> b) -> (c -> d) -> CofreeF f a c -> CofreeF f b d # first :: (a -> b) -> CofreeF f a c -> CofreeF f b c # second :: (b -> c) -> CofreeF f a b -> CofreeF f a c #
Functor f => Bifunctor (FreeF f)
Instance details Defined in Control.Monad.Trans.Free Methods bimap :: (a -> b) -> (c -> d) -> FreeF f a c -> FreeF f b d # first :: (a -> b) -> FreeF f a c -> FreeF f b c # second :: (b -> c) -> FreeF f a b -> FreeF f a c #
Functor f => Bifunctor (AlongsideLeft f)
Instance details Defined in Control.Lens.Internal.Getter Methods bimap :: (a -> b) -> (c -> d) -> AlongsideLeft f a c -> AlongsideLeft f b d # first :: (a -> b) -> AlongsideLeft f a c -> AlongsideLeft f b c # second :: (b -> c) -> AlongsideLeft f a b -> AlongsideLeft f a c #
Functor f => Bifunctor (AlongsideRight f)
Instance details Defined in Control.Lens.Internal.Getter Methods bimap :: (a -> b) -> (c -> d) -> AlongsideRight f a c -> AlongsideRight f b d # first :: (a -> b) -> AlongsideRight f a c -> AlongsideRight f b c # second :: (b -> c) -> AlongsideRight f a b -> AlongsideRight f a c #
Bifunctor (Tagged :: Type -> Type -> Type)
Instance details Defined in Data.Tagged Methods bimap :: (a -> b) -> (c -> d) -> Tagged a c -> Tagged b d # first :: (a -> b) -> Tagged a c -> Tagged b c # second :: (b -> c) -> Tagged a b -> Tagged a c #
Bifunctor (Constant :: Type -> Type -> Type)
Instance details Defined in Data.Functor.Constant Methods bimap :: (a -> b) -> (c -> d) -> Constant a c -> Constant b d # first :: (a -> b) -> Constant a c -> Constant b c # second :: (b -> c) -> Constant a b -> Constant a c #
Bifunctor ((,,) x1)	Since: base-4.8.0.0
Instance details Defined in Data.Bifunctor Methods bimap :: (a -> b) -> (c -> d) -> (x1, a, c) -> (x1, b, d) # first :: (a -> b) -> (x1, a, c) -> (x1, b, c) # second :: (b -> c) -> (x1, a, b) -> (x1, a, c) #
Bifunctor (K1 i :: Type -> Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Bifunctor Methods bimap :: (a -> b) -> (c -> d) -> K1 i a c -> K1 i b d # first :: (a -> b) -> K1 i a c -> K1 i b c # second :: (b -> c) -> K1 i a b -> K1 i a c #
Bifunctor ((,,,) x1 x2)	Since: base-4.8.0.0
Instance details Defined in Data.Bifunctor Methods bimap :: (a -> b) -> (c -> d) -> (x1, x2, a, c) -> (x1, x2, b, d) # first :: (a -> b) -> (x1, x2, a, c) -> (x1, x2, b, c) # second :: (b -> c) -> (x1, x2, a, b) -> (x1, x2, a, c) #
Functor f => Bifunctor (Clown f :: Type -> Type -> Type)
Instance details Defined in Data.Bifunctor.Clown Methods bimap :: (a -> b) -> (c -> d) -> Clown f a c -> Clown f b d # first :: (a -> b) -> Clown f a c -> Clown f b c # second :: (b -> c) -> Clown f a b -> Clown f a c #
Bifunctor p => Bifunctor (Flip p)
Instance details Defined in Data.Bifunctor.Flip Methods bimap :: (a -> b) -> (c -> d) -> Flip p a c -> Flip p b d # first :: (a -> b) -> Flip p a c -> Flip p b c # second :: (b -> c) -> Flip p a b -> Flip p a c #
Functor g => Bifunctor (Joker g :: Type -> Type -> Type)
Instance details Defined in Data.Bifunctor.Joker Methods bimap :: (a -> b) -> (c -> d) -> Joker g a c -> Joker g b d # first :: (a -> b) -> Joker g a c -> Joker g b c # second :: (b -> c) -> Joker g a b -> Joker g a c #
Bifunctor p => Bifunctor (WrappedBifunctor p)
Instance details Defined in Data.Bifunctor.Wrapped Methods bimap :: (a -> b) -> (c -> d) -> WrappedBifunctor p a c -> WrappedBifunctor p b d # first :: (a -> b) -> WrappedBifunctor p a c -> WrappedBifunctor p b c # second :: (b -> c) -> WrappedBifunctor p a b -> WrappedBifunctor p a c #
Bifunctor ((,,,,) x1 x2 x3)	Since: base-4.8.0.0
Instance details Defined in Data.Bifunctor Methods bimap :: (a -> b) -> (c -> d) -> (x1, x2, x3, a, c) -> (x1, x2, x3, b, d) # first :: (a -> b) -> (x1, x2, x3, a, c) -> (x1, x2, x3, b, c) # second :: (b -> c) -> (x1, x2, x3, a, b) -> (x1, x2, x3, a, c) #
(Bifunctor f, Bifunctor g) => Bifunctor (Product f g)
Instance details Defined in Data.Bifunctor.Product Methods bimap :: (a -> b) -> (c -> d) -> Product f g a c -> Product f g b d # first :: (a -> b) -> Product f g a c -> Product f g b c # second :: (b -> c) -> Product f g a b -> Product f g a c #
(Bifunctor p, Bifunctor q) => Bifunctor (Sum p q)
Instance details Defined in Data.Bifunctor.Sum Methods bimap :: (a -> b) -> (c -> d) -> Sum p q a c -> Sum p q b d # first :: (a -> b) -> Sum p q a c -> Sum p q b c # second :: (b -> c) -> Sum p q a b -> Sum p q a c #
Bifunctor ((,,,,,) x1 x2 x3 x4)	Since: base-4.8.0.0
Instance details Defined in Data.Bifunctor Methods bimap :: (a -> b) -> (c -> d) -> (x1, x2, x3, x4, a, c) -> (x1, x2, x3, x4, b, d) # first :: (a -> b) -> (x1, x2, x3, x4, a, c) -> (x1, x2, x3, x4, b, c) # second :: (b -> c) -> (x1, x2, x3, x4, a, b) -> (x1, x2, x3, x4, a, c) #
(Functor f, Bifunctor p) => Bifunctor (Tannen f p)
Instance details Defined in Data.Bifunctor.Tannen Methods bimap :: (a -> b) -> (c -> d) -> Tannen f p a c -> Tannen f p b d # first :: (a -> b) -> Tannen f p a c -> Tannen f p b c # second :: (b -> c) -> Tannen f p a b -> Tannen f p a c #
Bifunctor ((,,,,,,) x1 x2 x3 x4 x5)	Since: base-4.8.0.0
Instance details Defined in Data.Bifunctor Methods bimap :: (a -> b) -> (c -> d) -> (x1, x2, x3, x4, x5, a, c) -> (x1, x2, x3, x4, x5, b, d) # first :: (a -> b) -> (x1, x2, x3, x4, x5, a, c) -> (x1, x2, x3, x4, x5, b, c) # second :: (b -> c) -> (x1, x2, x3, x4, x5, a, b) -> (x1, x2, x3, x4, x5, a, c) #
(Bifunctor p, Functor f, Functor g) => Bifunctor (Biff p f g)
Instance details Defined in Data.Bifunctor.Biff Methods bimap :: (a -> b) -> (c -> d) -> Biff p f g a c -> Biff p f g b d # first :: (a -> b) -> Biff p f g a c -> Biff p f g b c # second :: (b -> c) -> Biff p f g a b -> Biff p f g a c #

newtype Identity a #

Identity functor and monad. (a non-strict monad)

Since: base-4.8.0.0

Constructors

Identity
Fields runIdentity :: a

Instances

Instances details

Representable Identity
Instance details Defined in Data.Functor.Rep Associated Types type Rep Identity # Methods tabulate :: (Rep Identity -> a) -> Identity a # index :: Identity a -> Rep Identity -> a #
MonadFix Identity	Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods mfix :: (a -> Identity a) -> Identity a #
Foldable Identity	Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods fold :: Monoid m => Identity m -> m # foldMap :: Monoid m => (a -> m) -> Identity a -> m # foldMap' :: Monoid m => (a -> m) -> Identity a -> m # foldr :: (a -> b -> b) -> b -> Identity a -> b # foldr' :: (a -> b -> b) -> b -> Identity a -> b # foldl :: (b -> a -> b) -> b -> Identity a -> b # foldl' :: (b -> a -> b) -> b -> Identity a -> b # foldr1 :: (a -> a -> a) -> Identity a -> a # foldl1 :: (a -> a -> a) -> Identity a -> a # toList :: Identity a -> [a] # null :: Identity a -> Bool # length :: Identity a -> Int # elem :: Eq a => a -> Identity a -> Bool # maximum :: Ord a => Identity a -> a # minimum :: Ord a => Identity a -> a # sum :: Num a => Identity a -> a # product :: Num a => Identity a -> a #
Eq1 Identity	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftEq :: (a -> b -> Bool) -> Identity a -> Identity b -> Bool #
Ord1 Identity	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftCompare :: (a -> b -> Ordering) -> Identity a -> Identity b -> Ordering #
Read1 Identity	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftReadsPrec :: (Int -> ReadS a) -> ReadS [a] -> Int -> ReadS (Identity a) # liftReadList :: (Int -> ReadS a) -> ReadS [a] -> ReadS [Identity a] # liftReadPrec :: ReadPrec a -> ReadPrec [a] -> ReadPrec (Identity a) # liftReadListPrec :: ReadPrec a -> ReadPrec [a] -> ReadPrec [Identity a] #
Show1 Identity	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftShowsPrec :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> Identity a -> ShowS # liftShowList :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> [Identity a] -> ShowS #
Traversable Identity	Since: base-4.9.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Identity a -> f (Identity b) # sequenceA :: Applicative f => Identity (f a) -> f (Identity a) # mapM :: Monad m => (a -> m b) -> Identity a -> m (Identity b) # sequence :: Monad m => Identity (m a) -> m (Identity a) #
Applicative Identity	Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods pure :: a -> Identity a # (<>) :: Identity (a -> b) -> Identity a -> Identity b # liftA2 :: (a -> b -> c) -> Identity a -> Identity b -> Identity c # (>) :: Identity a -> Identity b -> Identity b # (<*) :: Identity a -> Identity b -> Identity a #
Functor Identity	Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods fmap :: (a -> b) -> Identity a -> Identity b # (<$) :: a -> Identity b -> Identity a #
Monad Identity	Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods (>>=) :: Identity a -> (a -> Identity b) -> Identity b # (>>) :: Identity a -> Identity b -> Identity b # return :: a -> Identity a #
Comonad Identity
Instance details Defined in Control.Comonad Methods extract :: Identity a -> a # duplicate :: Identity a -> Identity (Identity a) # extend :: (Identity a -> b) -> Identity a -> Identity b #
ComonadApply Identity
Instance details Defined in Control.Comonad Methods (<@>) :: Identity (a -> b) -> Identity a -> Identity b # (@>) :: Identity a -> Identity b -> Identity b # (<@) :: Identity a -> Identity b -> Identity a #
Distributive Identity
Instance details Defined in Data.Distributive Methods distribute :: Functor f => f (Identity a) -> Identity (f a) # collect :: Functor f => (a -> Identity b) -> f a -> Identity (f b) # distributeM :: Monad m => m (Identity a) -> Identity (m a) # collectM :: Monad m => (a -> Identity b) -> m a -> Identity (m b) #
Hashable1 Identity
Instance details Defined in Data.Hashable.Class Methods liftHashWithSalt :: (Int -> a -> Int) -> Int -> Identity a -> Int #
Settable Identity	So you can pass our `Setter` into combinators from other lens libraries.
Instance details Defined in Control.Lens.Internal.Setter Methods untainted :: Identity a -> a # untaintedDot :: Profunctor p => p a (Identity b) -> p a b # taintedDot :: Profunctor p => p a b -> p a (Identity b) #
Affine Identity
Instance details Defined in Linear.Affine Associated Types type Diff Identity :: Type -> Type # Methods (.-.) :: Num a => Identity a -> Identity a -> Diff Identity a # (.+^) :: Num a => Identity a -> Diff Identity a -> Identity a # (.-^) :: Num a => Identity a -> Diff Identity a -> Identity a #
Metric Identity
Instance details Defined in Linear.Metric Methods dot :: Num a => Identity a -> Identity a -> a # quadrance :: Num a => Identity a -> a # qd :: Num a => Identity a -> Identity a -> a # distance :: Floating a => Identity a -> Identity a -> a # norm :: Floating a => Identity a -> a # signorm :: Floating a => Identity a -> Identity a #
R1 Identity
Instance details Defined in Linear.V1 Methods _x :: Lens' (Identity a) a #
Additive Identity
Instance details Defined in Linear.Vector Methods zero :: Num a => Identity a # (^+^) :: Num a => Identity a -> Identity a -> Identity a # (^-^) :: Num a => Identity a -> Identity a -> Identity a # lerp :: Num a => a -> Identity a -> Identity a -> Identity a # liftU2 :: (a -> a -> a) -> Identity a -> Identity a -> Identity a # liftI2 :: (a -> b -> c) -> Identity a -> Identity b -> Identity c #
Apply Identity
Instance details Defined in Data.Functor.Bind.Class Methods (<.>) :: Identity (a -> b) -> Identity a -> Identity b # (.>) :: Identity a -> Identity b -> Identity b # (<.) :: Identity a -> Identity b -> Identity a # liftF2 :: (a -> b -> c) -> Identity a -> Identity b -> Identity c #
Bind Identity
Instance details Defined in Data.Functor.Bind.Class Methods (>>-) :: Identity a -> (a -> Identity b) -> Identity b # join :: Identity (Identity a) -> Identity a #
Traversable1 Identity
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> Identity a -> f (Identity b) # sequence1 :: Apply f => Identity (f b) -> f (Identity b) #
Generic1 Identity
Instance details Defined in Data.Functor.Identity Associated Types type Rep1 Identity :: k -> Type # Methods from1 :: forall (a :: k). Identity a -> Rep1 Identity a # to1 :: forall (a :: k). Rep1 Identity a -> Identity a #
FoldableWithIndex () Identity
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (() -> a -> m) -> Identity a -> m # ifoldMap' :: Monoid m => (() -> a -> m) -> Identity a -> m # ifoldr :: (() -> a -> b -> b) -> b -> Identity a -> b # ifoldl :: (() -> b -> a -> b) -> b -> Identity a -> b # ifoldr' :: (() -> a -> b -> b) -> b -> Identity a -> b # ifoldl' :: (() -> b -> a -> b) -> b -> Identity a -> b #
FunctorWithIndex () Identity
Instance details Defined in WithIndex Methods imap :: (() -> a -> b) -> Identity a -> Identity b #
TraversableWithIndex () Identity
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (() -> a -> f b) -> Identity a -> f (Identity b) #
Cosieve ReifiedGetter Identity
Instance details Defined in Control.Lens.Reified Methods cosieve :: ReifiedGetter a b -> Identity a -> b #
Sieve ReifiedGetter Identity
Instance details Defined in Control.Lens.Reified Methods sieve :: ReifiedGetter a b -> a -> Identity b #
Comonad w => ComonadCofree Identity (CoiterT w)
Instance details Defined in Control.Comonad.Trans.Coiter Methods unwrap :: CoiterT w a -> Identity (CoiterT w a) #
Monad m => MonadFree Identity (IterT m)
Instance details Defined in Control.Monad.Trans.Iter Methods wrap :: Identity (IterT m a) -> IterT m a #
Unbox a => Vector Vector (Identity a)
Instance details Defined in Data.Vector.Unboxed.Base Methods basicUnsafeFreeze :: Mutable Vector s (Identity a) -> ST s (Vector (Identity a)) # basicUnsafeThaw :: Vector (Identity a) -> ST s (Mutable Vector s (Identity a)) # basicLength :: Vector (Identity a) -> Int # basicUnsafeSlice :: Int -> Int -> Vector (Identity a) -> Vector (Identity a) # basicUnsafeIndexM :: Vector (Identity a) -> Int -> Box (Identity a) # basicUnsafeCopy :: Mutable Vector s (Identity a) -> Vector (Identity a) -> ST s () # elemseq :: Vector (Identity a) -> Identity a -> b -> b #
Unbox a => MVector MVector (Identity a)
Instance details Defined in Data.Vector.Unboxed.Base Methods basicLength :: MVector s (Identity a) -> Int # basicUnsafeSlice :: Int -> Int -> MVector s (Identity a) -> MVector s (Identity a) # basicOverlaps :: MVector s (Identity a) -> MVector s (Identity a) -> Bool # basicUnsafeNew :: Int -> ST s (MVector s (Identity a)) # basicInitialize :: MVector s (Identity a) -> ST s () # basicUnsafeReplicate :: Int -> Identity a -> ST s (MVector s (Identity a)) # basicUnsafeRead :: MVector s (Identity a) -> Int -> ST s (Identity a) # basicUnsafeWrite :: MVector s (Identity a) -> Int -> Identity a -> ST s () # basicClear :: MVector s (Identity a) -> ST s () # basicSet :: MVector s (Identity a) -> Identity a -> ST s () # basicUnsafeCopy :: MVector s (Identity a) -> MVector s (Identity a) -> ST s () # basicUnsafeMove :: MVector s (Identity a) -> MVector s (Identity a) -> ST s () # basicUnsafeGrow :: MVector s (Identity a) -> Int -> ST s (MVector s (Identity a)) #
Data a => Data (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Data Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Identity a -> c (Identity a) # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Identity a) # toConstr :: Identity a -> Constr # dataTypeOf :: Identity a -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (Identity a)) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (Identity a)) # gmapT :: (forall b. Data b => b -> b) -> Identity a -> Identity a # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Identity a -> r # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Identity a -> r # gmapQ :: (forall d. Data d => d -> u) -> Identity a -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> Identity a -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Identity a -> m (Identity a) # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Identity a -> m (Identity a) # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Identity a -> m (Identity a) #
IsString a => IsString (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.String Methods fromString :: String -> Identity a #
Storable a => Storable (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods sizeOf :: Identity a -> Int # alignment :: Identity a -> Int # peekElemOff :: Ptr (Identity a) -> Int -> IO (Identity a) # pokeElemOff :: Ptr (Identity a) -> Int -> Identity a -> IO () # peekByteOff :: Ptr b -> Int -> IO (Identity a) # pokeByteOff :: Ptr b -> Int -> Identity a -> IO () # peek :: Ptr (Identity a) -> IO (Identity a) # poke :: Ptr (Identity a) -> Identity a -> IO () #
Monoid a => Monoid (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods mempty :: Identity a # mappend :: Identity a -> Identity a -> Identity a # mconcat :: [Identity a] -> Identity a #
Semigroup a => Semigroup (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods (<>) :: Identity a -> Identity a -> Identity a # sconcat :: NonEmpty (Identity a) -> Identity a # stimes :: Integral b => b -> Identity a -> Identity a #
Bits a => Bits (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods (.&.) :: Identity a -> Identity a -> Identity a # (.\|.) :: Identity a -> Identity a -> Identity a # xor :: Identity a -> Identity a -> Identity a # complement :: Identity a -> Identity a # shift :: Identity a -> Int -> Identity a # rotate :: Identity a -> Int -> Identity a # zeroBits :: Identity a # bit :: Int -> Identity a # setBit :: Identity a -> Int -> Identity a # clearBit :: Identity a -> Int -> Identity a # complementBit :: Identity a -> Int -> Identity a # testBit :: Identity a -> Int -> Bool # bitSizeMaybe :: Identity a -> Maybe Int # bitSize :: Identity a -> Int # isSigned :: Identity a -> Bool # shiftL :: Identity a -> Int -> Identity a # unsafeShiftL :: Identity a -> Int -> Identity a # shiftR :: Identity a -> Int -> Identity a # unsafeShiftR :: Identity a -> Int -> Identity a # rotateL :: Identity a -> Int -> Identity a # rotateR :: Identity a -> Int -> Identity a # popCount :: Identity a -> Int #
FiniteBits a => FiniteBits (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods finiteBitSize :: Identity a -> Int # countLeadingZeros :: Identity a -> Int # countTrailingZeros :: Identity a -> Int #
Bounded a => Bounded (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods minBound :: Identity a # maxBound :: Identity a #
Enum a => Enum (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods succ :: Identity a -> Identity a # pred :: Identity a -> Identity a # toEnum :: Int -> Identity a # fromEnum :: Identity a -> Int # enumFrom :: Identity a -> [Identity a] # enumFromThen :: Identity a -> Identity a -> [Identity a] # enumFromTo :: Identity a -> Identity a -> [Identity a] # enumFromThenTo :: Identity a -> Identity a -> Identity a -> [Identity a] #
Floating a => Floating (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods pi :: Identity a # exp :: Identity a -> Identity a # log :: Identity a -> Identity a # sqrt :: Identity a -> Identity a # (**) :: Identity a -> Identity a -> Identity a # logBase :: Identity a -> Identity a -> Identity a # sin :: Identity a -> Identity a # cos :: Identity a -> Identity a # tan :: Identity a -> Identity a # asin :: Identity a -> Identity a # acos :: Identity a -> Identity a # atan :: Identity a -> Identity a # sinh :: Identity a -> Identity a # cosh :: Identity a -> Identity a # tanh :: Identity a -> Identity a # asinh :: Identity a -> Identity a # acosh :: Identity a -> Identity a # atanh :: Identity a -> Identity a # log1p :: Identity a -> Identity a # expm1 :: Identity a -> Identity a # log1pexp :: Identity a -> Identity a # log1mexp :: Identity a -> Identity a #
RealFloat a => RealFloat (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods floatRadix :: Identity a -> Integer # floatDigits :: Identity a -> Int # floatRange :: Identity a -> (Int, Int) # decodeFloat :: Identity a -> (Integer, Int) # encodeFloat :: Integer -> Int -> Identity a # exponent :: Identity a -> Int # significand :: Identity a -> Identity a # scaleFloat :: Int -> Identity a -> Identity a # isNaN :: Identity a -> Bool # isInfinite :: Identity a -> Bool # isDenormalized :: Identity a -> Bool # isNegativeZero :: Identity a -> Bool # isIEEE :: Identity a -> Bool # atan2 :: Identity a -> Identity a -> Identity a #
Generic (Identity a)
Instance details Defined in Data.Functor.Identity Associated Types type Rep (Identity a) :: Type -> Type # Methods from :: Identity a -> Rep (Identity a) x # to :: Rep (Identity a) x -> Identity a #
Ix a => Ix (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods range :: (Identity a, Identity a) -> [Identity a] # index :: (Identity a, Identity a) -> Identity a -> Int # unsafeIndex :: (Identity a, Identity a) -> Identity a -> Int # inRange :: (Identity a, Identity a) -> Identity a -> Bool # rangeSize :: (Identity a, Identity a) -> Int # unsafeRangeSize :: (Identity a, Identity a) -> Int #
Num a => Num (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods (+) :: Identity a -> Identity a -> Identity a # (-) :: Identity a -> Identity a -> Identity a # (*) :: Identity a -> Identity a -> Identity a # negate :: Identity a -> Identity a # abs :: Identity a -> Identity a # signum :: Identity a -> Identity a # fromInteger :: Integer -> Identity a #
Read a => Read (Identity a)	This instance would be equivalent to the derived instances of the `Identity` newtype if the `runIdentity` field were removed Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods readsPrec :: Int -> ReadS (Identity a) # readList :: ReadS [Identity a] # readPrec :: ReadPrec (Identity a) # readListPrec :: ReadPrec [Identity a] #
Fractional a => Fractional (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods (/) :: Identity a -> Identity a -> Identity a # recip :: Identity a -> Identity a # fromRational :: Rational -> Identity a #
Integral a => Integral (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods quot :: Identity a -> Identity a -> Identity a # rem :: Identity a -> Identity a -> Identity a # div :: Identity a -> Identity a -> Identity a # mod :: Identity a -> Identity a -> Identity a # quotRem :: Identity a -> Identity a -> (Identity a, Identity a) # divMod :: Identity a -> Identity a -> (Identity a, Identity a) # toInteger :: Identity a -> Integer #
Real a => Real (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods toRational :: Identity a -> Rational #
RealFrac a => RealFrac (Identity a)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Identity Methods properFraction :: Integral b => Identity a -> (b, Identity a) # truncate :: Integral b => Identity a -> b # round :: Integral b => Identity a -> b # ceiling :: Integral b => Identity a -> b # floor :: Integral b => Identity a -> b #
Show a => Show (Identity a)	This instance would be equivalent to the derived instances of the `Identity` newtype if the `runIdentity` field were removed Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods showsPrec :: Int -> Identity a -> ShowS # show :: Identity a -> String # showList :: [Identity a] -> ShowS #
Eq a => Eq (Identity a)	Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods (==) :: Identity a -> Identity a -> Bool # (/=) :: Identity a -> Identity a -> Bool #
Ord a => Ord (Identity a)	Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods compare :: Identity a -> Identity a -> Ordering # (<) :: Identity a -> Identity a -> Bool # (<=) :: Identity a -> Identity a -> Bool # (>) :: Identity a -> Identity a -> Bool # (>=) :: Identity a -> Identity a -> Bool # max :: Identity a -> Identity a -> Identity a # min :: Identity a -> Identity a -> Identity a #
Hashable a => Hashable (Identity a)
Instance details Defined in Data.Hashable.Class Methods hashWithSalt :: Int -> Identity a -> Int # hash :: Identity a -> Int #
Ixed (Identity a)
Instance details Defined in Control.Lens.At Methods ix :: Index (Identity a) -> Traversal' (Identity a) (IxValue (Identity a)) #
Wrapped (Identity a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Identity a) # Methods _Wrapped' :: Iso' (Identity a) (Unwrapped (Identity a)) #
Prim a => Prim (Identity a)	Since: primitive-0.6.5.0
Instance details Defined in Data.Primitive.Types Methods sizeOf# :: Identity a -> Int# # alignment# :: Identity a -> Int# # indexByteArray# :: ByteArray# -> Int# -> Identity a # readByteArray# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Identity a #) # writeByteArray# :: MutableByteArray# s -> Int# -> Identity a -> State# s -> State# s # setByteArray# :: MutableByteArray# s -> Int# -> Int# -> Identity a -> State# s -> State# s # indexOffAddr# :: Addr# -> Int# -> Identity a # readOffAddr# :: Addr# -> Int# -> State# s -> (# State# s, Identity a #) # writeOffAddr# :: Addr# -> Int# -> Identity a -> State# s -> State# s # setOffAddr# :: Addr# -> Int# -> Int# -> Identity a -> State# s -> State# s #
Unbox a => Unbox (Identity a)
Instance details Defined in Data.Vector.Unboxed.Base
t ~ Identity b => Rewrapped (Identity a) t
Instance details Defined in Control.Lens.Wrapped
Each (Identity a) (Identity b) a b	`each` :: `Traversal` (`Identity` a) (`Identity` b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Identity a) (Identity b) a b #
Field1 (Identity a) (Identity b) a b
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (Identity a) (Identity b) a b #
Cosieve (->) Identity
Instance details Defined in Data.Profunctor.Sieve Methods cosieve :: (a -> b) -> Identity a -> b #
Sieve (->) Identity
Instance details Defined in Data.Profunctor.Sieve Methods sieve :: (a -> b) -> a -> Identity b #
type Rep Identity
Instance details Defined in Data.Functor.Rep type Rep Identity = ()
type Diff Identity
Instance details Defined in Linear.Affine type Diff Identity = Identity
type Rep1 Identity	Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity type Rep1 Identity = D1 ('MetaData "Identity" "Data.Functor.Identity" "base" 'True) (C1 ('MetaCons "Identity" 'PrefixI 'True) (S1 ('MetaSel ('Just "runIdentity") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) Par1))
newtype MVector s (Identity a)
Instance details Defined in Data.Vector.Unboxed.Base newtype MVector s (Identity a) = MV_Identity (MVector s a)
type Rep (Identity a)	Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity type Rep (Identity a) = D1 ('MetaData "Identity" "Data.Functor.Identity" "base" 'True) (C1 ('MetaCons "Identity" 'PrefixI 'True) (S1 ('MetaSel ('Just "runIdentity") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a)))
type Index (Identity a)
Instance details Defined in Control.Lens.At type Index (Identity a) = ()
type IxValue (Identity a)
Instance details Defined in Control.Lens.At type IxValue (Identity a) = a
type Unwrapped (Identity a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Identity a) = a
newtype Vector (Identity a)
Instance details Defined in Data.Vector.Unboxed.Base newtype Vector (Identity a) = V_Identity (Vector a)

newtype Const a (b :: k) #

The Const functor.

Constructors

Const
Fields getConst :: a

Instances

Instances details

Semigroupoid (Const :: Type -> Type -> Type)
Instance details Defined in Data.Semigroupoid Methods o :: forall (j :: k) (k1 :: k) (i :: k). Const j k1 -> Const i j -> Const i k1 #
Generic1 (Const a :: k -> Type)
Instance details Defined in Data.Functor.Const Associated Types type Rep1 (Const a) :: k -> Type # Methods from1 :: forall (a0 :: k0). Const a a0 -> Rep1 (Const a) a0 # to1 :: forall (a0 :: k0). Rep1 (Const a) a0 -> Const a a0 #
FoldableWithIndex Void (Const e :: Type -> Type)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Void -> a -> m) -> Const e a -> m # ifoldMap' :: Monoid m => (Void -> a -> m) -> Const e a -> m # ifoldr :: (Void -> a -> b -> b) -> b -> Const e a -> b # ifoldl :: (Void -> b -> a -> b) -> b -> Const e a -> b # ifoldr' :: (Void -> a -> b -> b) -> b -> Const e a -> b # ifoldl' :: (Void -> b -> a -> b) -> b -> Const e a -> b #
FunctorWithIndex Void (Const e :: Type -> Type)
Instance details Defined in WithIndex Methods imap :: (Void -> a -> b) -> Const e a -> Const e b #
TraversableWithIndex Void (Const e :: Type -> Type)
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (Void -> a -> f b) -> Const e a -> f (Const e b) #
Unbox a => Vector Vector (Const a b)
Instance details Defined in Data.Vector.Unboxed.Base Methods basicUnsafeFreeze :: Mutable Vector s (Const a b) -> ST s (Vector (Const a b)) # basicUnsafeThaw :: Vector (Const a b) -> ST s (Mutable Vector s (Const a b)) # basicLength :: Vector (Const a b) -> Int # basicUnsafeSlice :: Int -> Int -> Vector (Const a b) -> Vector (Const a b) # basicUnsafeIndexM :: Vector (Const a b) -> Int -> Box (Const a b) # basicUnsafeCopy :: Mutable Vector s (Const a b) -> Vector (Const a b) -> ST s () # elemseq :: Vector (Const a b) -> Const a b -> b0 -> b0 #
Unbox a => MVector MVector (Const a b)
Instance details Defined in Data.Vector.Unboxed.Base Methods basicLength :: MVector s (Const a b) -> Int # basicUnsafeSlice :: Int -> Int -> MVector s (Const a b) -> MVector s (Const a b) # basicOverlaps :: MVector s (Const a b) -> MVector s (Const a b) -> Bool # basicUnsafeNew :: Int -> ST s (MVector s (Const a b)) # basicInitialize :: MVector s (Const a b) -> ST s () # basicUnsafeReplicate :: Int -> Const a b -> ST s (MVector s (Const a b)) # basicUnsafeRead :: MVector s (Const a b) -> Int -> ST s (Const a b) # basicUnsafeWrite :: MVector s (Const a b) -> Int -> Const a b -> ST s () # basicClear :: MVector s (Const a b) -> ST s () # basicSet :: MVector s (Const a b) -> Const a b -> ST s () # basicUnsafeCopy :: MVector s (Const a b) -> MVector s (Const a b) -> ST s () # basicUnsafeMove :: MVector s (Const a b) -> MVector s (Const a b) -> ST s () # basicUnsafeGrow :: MVector s (Const a b) -> Int -> ST s (MVector s (Const a b)) #
Bifoldable (Const :: Type -> TYPE LiftedRep -> Type)	Since: base-4.10.0.0
Instance details Defined in Data.Bifoldable Methods bifold :: Monoid m => Const m m -> m # bifoldMap :: Monoid m => (a -> m) -> (b -> m) -> Const a b -> m # bifoldr :: (a -> c -> c) -> (b -> c -> c) -> c -> Const a b -> c # bifoldl :: (c -> a -> c) -> (c -> b -> c) -> c -> Const a b -> c #
Bifunctor (Const :: Type -> Type -> Type)	Since: base-4.8.0.0
Instance details Defined in Data.Bifunctor Methods bimap :: (a -> b) -> (c -> d) -> Const a c -> Const b d # first :: (a -> b) -> Const a c -> Const b c # second :: (b -> c) -> Const a b -> Const a c #
Bitraversable (Const :: Type -> Type -> Type)	Since: base-4.10.0.0
Instance details Defined in Data.Bitraversable Methods bitraverse :: Applicative f => (a -> f c) -> (b -> f d) -> Const a b -> f (Const c d) #
Eq2 (Const :: Type -> Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftEq2 :: (a -> b -> Bool) -> (c -> d -> Bool) -> Const a c -> Const b d -> Bool #
Ord2 (Const :: Type -> Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftCompare2 :: (a -> b -> Ordering) -> (c -> d -> Ordering) -> Const a c -> Const b d -> Ordering #
Read2 (Const :: Type -> Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftReadsPrec2 :: (Int -> ReadS a) -> ReadS [a] -> (Int -> ReadS b) -> ReadS [b] -> Int -> ReadS (Const a b) # liftReadList2 :: (Int -> ReadS a) -> ReadS [a] -> (Int -> ReadS b) -> ReadS [b] -> ReadS [Const a b] # liftReadPrec2 :: ReadPrec a -> ReadPrec [a] -> ReadPrec b -> ReadPrec [b] -> ReadPrec (Const a b) # liftReadListPrec2 :: ReadPrec a -> ReadPrec [a] -> ReadPrec b -> ReadPrec [b] -> ReadPrec [Const a b] #
Show2 (Const :: Type -> TYPE LiftedRep -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftShowsPrec2 :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> (Int -> b -> ShowS) -> ([b] -> ShowS) -> Int -> Const a b -> ShowS # liftShowList2 :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> (Int -> b -> ShowS) -> ([b] -> ShowS) -> [Const a b] -> ShowS #
Biapplicative (Const :: Type -> Type -> Type)
Instance details Defined in Data.Biapplicative Methods bipure :: a -> b -> Const a b # (<<>>) :: Const (a -> b) (c -> d) -> Const a c -> Const b d # biliftA2 :: (a -> b -> c) -> (d -> e -> f) -> Const a d -> Const b e -> Const c f # (>>) :: Const a b -> Const c d -> Const c d # (<<*) :: Const a b -> Const c d -> Const a b #
Hashable2 (Const :: Type -> Type -> Type)
Instance details Defined in Data.Hashable.Class Methods liftHashWithSalt2 :: (Int -> a -> Int) -> (Int -> b -> Int) -> Int -> Const a b -> Int #
Biapply (Const :: Type -> Type -> Type)
Instance details Defined in Data.Functor.Bind.Class Methods (<<.>>) :: Const (a -> b) (c -> d) -> Const a c -> Const b d # (.>>) :: Const a b -> Const c d -> Const c d # (<<.) :: Const a b -> Const c d -> Const a b #
Bitraversable1 (Const :: Type -> TYPE LiftedRep -> Type)
Instance details Defined in Data.Semigroup.Traversable.Class Methods bitraverse1 :: Apply f => (a -> f b) -> (c -> f d) -> Const a c -> f (Const b d) # bisequence1 :: Apply f => Const (f a) (f b) -> f (Const a b) #
Foldable (Const m :: TYPE LiftedRep -> Type)	Since: base-4.7.0.0
Instance details Defined in Data.Functor.Const Methods fold :: Monoid m0 => Const m m0 -> m0 # foldMap :: Monoid m0 => (a -> m0) -> Const m a -> m0 # foldMap' :: Monoid m0 => (a -> m0) -> Const m a -> m0 # foldr :: (a -> b -> b) -> b -> Const m a -> b # foldr' :: (a -> b -> b) -> b -> Const m a -> b # foldl :: (b -> a -> b) -> b -> Const m a -> b # foldl' :: (b -> a -> b) -> b -> Const m a -> b # foldr1 :: (a -> a -> a) -> Const m a -> a # foldl1 :: (a -> a -> a) -> Const m a -> a # toList :: Const m a -> [a] # null :: Const m a -> Bool # length :: Const m a -> Int # elem :: Eq a => a -> Const m a -> Bool # maximum :: Ord a => Const m a -> a # minimum :: Ord a => Const m a -> a # sum :: Num a => Const m a -> a # product :: Num a => Const m a -> a #
Eq a => Eq1 (Const a :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftEq :: (a0 -> b -> Bool) -> Const a a0 -> Const a b -> Bool #
Ord a => Ord1 (Const a :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftCompare :: (a0 -> b -> Ordering) -> Const a a0 -> Const a b -> Ordering #
Read a => Read1 (Const a :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftReadsPrec :: (Int -> ReadS a0) -> ReadS [a0] -> Int -> ReadS (Const a a0) # liftReadList :: (Int -> ReadS a0) -> ReadS [a0] -> ReadS [Const a a0] # liftReadPrec :: ReadPrec a0 -> ReadPrec [a0] -> ReadPrec (Const a a0) # liftReadListPrec :: ReadPrec a0 -> ReadPrec [a0] -> ReadPrec [Const a a0] #
Show a => Show1 (Const a :: TYPE LiftedRep -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftShowsPrec :: (Int -> a0 -> ShowS) -> ([a0] -> ShowS) -> Int -> Const a a0 -> ShowS # liftShowList :: (Int -> a0 -> ShowS) -> ([a0] -> ShowS) -> [Const a a0] -> ShowS #
Contravariant (Const a :: Type -> Type)
Instance details Defined in Data.Functor.Contravariant Methods contramap :: (a' -> a0) -> Const a a0 -> Const a a' # (>$) :: b -> Const a b -> Const a a0 #
Traversable (Const m :: Type -> Type)	Since: base-4.7.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Const m a -> f (Const m b) # sequenceA :: Applicative f => Const m (f a) -> f (Const m a) # mapM :: Monad m0 => (a -> m0 b) -> Const m a -> m0 (Const m b) # sequence :: Monad m0 => Const m (m0 a) -> m0 (Const m a) #
Monoid m => Applicative (Const m :: Type -> Type)	Since: base-2.0.1
Instance details Defined in Data.Functor.Const Methods pure :: a -> Const m a # (<>) :: Const m (a -> b) -> Const m a -> Const m b # liftA2 :: (a -> b -> c) -> Const m a -> Const m b -> Const m c # (>) :: Const m a -> Const m b -> Const m b # (<*) :: Const m a -> Const m b -> Const m a #
Functor (Const m :: Type -> Type)	Since: base-2.1
Instance details Defined in Data.Functor.Const Methods fmap :: (a -> b) -> Const m a -> Const m b # (<$) :: a -> Const m b -> Const m a #
Hashable a => Hashable1 (Const a :: Type -> Type)
Instance details Defined in Data.Hashable.Class Methods liftHashWithSalt :: (Int -> a0 -> Int) -> Int -> Const a a0 -> Int #
Semigroup m => Apply (Const m :: Type -> Type)	A `Const m` is not `Applicative` unless its `m` is a `Monoid`, but it is an instance of `Apply`
Instance details Defined in Data.Functor.Bind.Class Methods (<.>) :: Const m (a -> b) -> Const m a -> Const m b # (.>) :: Const m a -> Const m b -> Const m b # (<.) :: Const m a -> Const m b -> Const m a # liftF2 :: (a -> b -> c) -> Const m a -> Const m b -> Const m c #
Sieve (Forget r :: Type -> Type -> TYPE LiftedRep) (Const r :: Type -> Type)
Instance details Defined in Data.Profunctor.Sieve Methods sieve :: Forget r a b -> a -> Const r b #
(Typeable k, Data a, Typeable b) => Data (Const a b)	Since: base-4.10.0.0
Instance details Defined in Data.Data Methods gfoldl :: (forall d b0. Data d => c (d -> b0) -> d -> c b0) -> (forall g. g -> c g) -> Const a b -> c (Const a b) # gunfold :: (forall b0 r. Data b0 => c (b0 -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Const a b) # toConstr :: Const a b -> Constr # dataTypeOf :: Const a b -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (Const a b)) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (Const a b)) # gmapT :: (forall b0. Data b0 => b0 -> b0) -> Const a b -> Const a b # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Const a b -> r # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Const a b -> r # gmapQ :: (forall d. Data d => d -> u) -> Const a b -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> Const a b -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Const a b -> m (Const a b) # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Const a b -> m (Const a b) # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Const a b -> m (Const a b) #
IsString a => IsString (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.String Methods fromString :: String -> Const a b #
Storable a => Storable (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods sizeOf :: Const a b -> Int # alignment :: Const a b -> Int # peekElemOff :: Ptr (Const a b) -> Int -> IO (Const a b) # pokeElemOff :: Ptr (Const a b) -> Int -> Const a b -> IO () # peekByteOff :: Ptr b0 -> Int -> IO (Const a b) # pokeByteOff :: Ptr b0 -> Int -> Const a b -> IO () # peek :: Ptr (Const a b) -> IO (Const a b) # poke :: Ptr (Const a b) -> Const a b -> IO () #
Monoid a => Monoid (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods mempty :: Const a b # mappend :: Const a b -> Const a b -> Const a b # mconcat :: [Const a b] -> Const a b #
Semigroup a => Semigroup (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods (<>) :: Const a b -> Const a b -> Const a b # sconcat :: NonEmpty (Const a b) -> Const a b # stimes :: Integral b0 => b0 -> Const a b -> Const a b #
Bits a => Bits (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods (.&.) :: Const a b -> Const a b -> Const a b # (.\|.) :: Const a b -> Const a b -> Const a b # xor :: Const a b -> Const a b -> Const a b # complement :: Const a b -> Const a b # shift :: Const a b -> Int -> Const a b # rotate :: Const a b -> Int -> Const a b # zeroBits :: Const a b # bit :: Int -> Const a b # setBit :: Const a b -> Int -> Const a b # clearBit :: Const a b -> Int -> Const a b # complementBit :: Const a b -> Int -> Const a b # testBit :: Const a b -> Int -> Bool # bitSizeMaybe :: Const a b -> Maybe Int # bitSize :: Const a b -> Int # isSigned :: Const a b -> Bool # shiftL :: Const a b -> Int -> Const a b # unsafeShiftL :: Const a b -> Int -> Const a b # shiftR :: Const a b -> Int -> Const a b # unsafeShiftR :: Const a b -> Int -> Const a b # rotateL :: Const a b -> Int -> Const a b # rotateR :: Const a b -> Int -> Const a b # popCount :: Const a b -> Int #
FiniteBits a => FiniteBits (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods finiteBitSize :: Const a b -> Int # countLeadingZeros :: Const a b -> Int # countTrailingZeros :: Const a b -> Int #
Bounded a => Bounded (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods minBound :: Const a b # maxBound :: Const a b #
Enum a => Enum (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods succ :: Const a b -> Const a b # pred :: Const a b -> Const a b # toEnum :: Int -> Const a b # fromEnum :: Const a b -> Int # enumFrom :: Const a b -> [Const a b] # enumFromThen :: Const a b -> Const a b -> [Const a b] # enumFromTo :: Const a b -> Const a b -> [Const a b] # enumFromThenTo :: Const a b -> Const a b -> Const a b -> [Const a b] #
Floating a => Floating (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods pi :: Const a b # exp :: Const a b -> Const a b # log :: Const a b -> Const a b # sqrt :: Const a b -> Const a b # (**) :: Const a b -> Const a b -> Const a b # logBase :: Const a b -> Const a b -> Const a b # sin :: Const a b -> Const a b # cos :: Const a b -> Const a b # tan :: Const a b -> Const a b # asin :: Const a b -> Const a b # acos :: Const a b -> Const a b # atan :: Const a b -> Const a b # sinh :: Const a b -> Const a b # cosh :: Const a b -> Const a b # tanh :: Const a b -> Const a b # asinh :: Const a b -> Const a b # acosh :: Const a b -> Const a b # atanh :: Const a b -> Const a b # log1p :: Const a b -> Const a b # expm1 :: Const a b -> Const a b # log1pexp :: Const a b -> Const a b # log1mexp :: Const a b -> Const a b #
RealFloat a => RealFloat (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods floatRadix :: Const a b -> Integer # floatDigits :: Const a b -> Int # floatRange :: Const a b -> (Int, Int) # decodeFloat :: Const a b -> (Integer, Int) # encodeFloat :: Integer -> Int -> Const a b # exponent :: Const a b -> Int # significand :: Const a b -> Const a b # scaleFloat :: Int -> Const a b -> Const a b # isNaN :: Const a b -> Bool # isInfinite :: Const a b -> Bool # isDenormalized :: Const a b -> Bool # isNegativeZero :: Const a b -> Bool # isIEEE :: Const a b -> Bool # atan2 :: Const a b -> Const a b -> Const a b #
Generic (Const a b)
Instance details Defined in Data.Functor.Const Associated Types type Rep (Const a b) :: Type -> Type # Methods from :: Const a b -> Rep (Const a b) x # to :: Rep (Const a b) x -> Const a b #
Ix a => Ix (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods range :: (Const a b, Const a b) -> [Const a b] # index :: (Const a b, Const a b) -> Const a b -> Int # unsafeIndex :: (Const a b, Const a b) -> Const a b -> Int # inRange :: (Const a b, Const a b) -> Const a b -> Bool # rangeSize :: (Const a b, Const a b) -> Int # unsafeRangeSize :: (Const a b, Const a b) -> Int #
Num a => Num (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods (+) :: Const a b -> Const a b -> Const a b # (-) :: Const a b -> Const a b -> Const a b # (*) :: Const a b -> Const a b -> Const a b # negate :: Const a b -> Const a b # abs :: Const a b -> Const a b # signum :: Const a b -> Const a b # fromInteger :: Integer -> Const a b #
Read a => Read (Const a b)	This instance would be equivalent to the derived instances of the `Const` newtype if the `getConst` field were removed Since: base-4.8.0.0
Instance details Defined in Data.Functor.Const Methods readsPrec :: Int -> ReadS (Const a b) # readList :: ReadS [Const a b] # readPrec :: ReadPrec (Const a b) # readListPrec :: ReadPrec [Const a b] #
Fractional a => Fractional (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods (/) :: Const a b -> Const a b -> Const a b # recip :: Const a b -> Const a b # fromRational :: Rational -> Const a b #
Integral a => Integral (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods quot :: Const a b -> Const a b -> Const a b # rem :: Const a b -> Const a b -> Const a b # div :: Const a b -> Const a b -> Const a b # mod :: Const a b -> Const a b -> Const a b # quotRem :: Const a b -> Const a b -> (Const a b, Const a b) # divMod :: Const a b -> Const a b -> (Const a b, Const a b) # toInteger :: Const a b -> Integer #
Real a => Real (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods toRational :: Const a b -> Rational #
RealFrac a => RealFrac (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods properFraction :: Integral b0 => Const a b -> (b0, Const a b) # truncate :: Integral b0 => Const a b -> b0 # round :: Integral b0 => Const a b -> b0 # ceiling :: Integral b0 => Const a b -> b0 # floor :: Integral b0 => Const a b -> b0 #
Show a => Show (Const a b)	This instance would be equivalent to the derived instances of the `Const` newtype if the `getConst` field were removed Since: base-4.8.0.0
Instance details Defined in Data.Functor.Const Methods showsPrec :: Int -> Const a b -> ShowS # show :: Const a b -> String # showList :: [Const a b] -> ShowS #
Eq a => Eq (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods (==) :: Const a b -> Const a b -> Bool # (/=) :: Const a b -> Const a b -> Bool #
Ord a => Ord (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const Methods compare :: Const a b -> Const a b -> Ordering # (<) :: Const a b -> Const a b -> Bool # (<=) :: Const a b -> Const a b -> Bool # (>) :: Const a b -> Const a b -> Bool # (>=) :: Const a b -> Const a b -> Bool # max :: Const a b -> Const a b -> Const a b # min :: Const a b -> Const a b -> Const a b #
Hashable a => Hashable (Const a b)
Instance details Defined in Data.Hashable.Class Methods hashWithSalt :: Int -> Const a b -> Int # hash :: Const a b -> Int #
Wrapped (Const a x)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Const a x) # Methods _Wrapped' :: Iso' (Const a x) (Unwrapped (Const a x)) #
Prim a => Prim (Const a b)	Since: primitive-0.6.5.0
Instance details Defined in Data.Primitive.Types Methods sizeOf# :: Const a b -> Int# # alignment# :: Const a b -> Int# # indexByteArray# :: ByteArray# -> Int# -> Const a b # readByteArray# :: MutableByteArray# s -> Int# -> State# s -> (# State# s, Const a b #) # writeByteArray# :: MutableByteArray# s -> Int# -> Const a b -> State# s -> State# s # setByteArray# :: MutableByteArray# s -> Int# -> Int# -> Const a b -> State# s -> State# s # indexOffAddr# :: Addr# -> Int# -> Const a b # readOffAddr# :: Addr# -> Int# -> State# s -> (# State# s, Const a b #) # writeOffAddr# :: Addr# -> Int# -> Const a b -> State# s -> State# s # setOffAddr# :: Addr# -> Int# -> Int# -> Const a b -> State# s -> State# s #
Unbox a => Unbox (Const a b)
Instance details Defined in Data.Vector.Unboxed.Base
t ~ Const a' x' => Rewrapped (Const a x) t
Instance details Defined in Control.Lens.Wrapped
type Rep1 (Const a :: k -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const type Rep1 (Const a :: k -> Type) = D1 ('MetaData "Const" "Data.Functor.Const" "base" 'True) (C1 ('MetaCons "Const" 'PrefixI 'True) (S1 ('MetaSel ('Just "getConst") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a)))
newtype MVector s (Const a b)
Instance details Defined in Data.Vector.Unboxed.Base newtype MVector s (Const a b) = MV_Const (MVector s a)
type Rep (Const a b)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Const type Rep (Const a b) = D1 ('MetaData "Const" "Data.Functor.Const" "base" 'True) (C1 ('MetaCons "Const" 'PrefixI 'True) (S1 ('MetaSel ('Just "getConst") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a)))
type Unwrapped (Const a x)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Const a x) = a
newtype Vector (Const a b)
Instance details Defined in Data.Vector.Unboxed.Base newtype Vector (Const a b) = V_Const (Vector a)

data (a :: k) :~: (b :: k) where infix 4 #

Propositional equality. If a :~: b is inhabited by some terminating value, then the type a is the same as the type b. To use this equality in practice, pattern-match on the a :~: b to get out the Refl constructor; in the body of the pattern-match, the compiler knows that a ~ b.

Since: base-4.7.0.0

Constructors

Refl :: forall {k} (a :: k). a :~: a

Instances

Instances details

Category ((:~:) :: k -> k -> Type)	Since: base-4.7.0.0
Instance details Defined in Control.Category Methods id :: forall (a :: k0). a :~: a # (.) :: forall (b :: k0) (c :: k0) (a :: k0). (b :~: c) -> (a :~: b) -> a :~: c #
Semigroupoid ((:~:) :: k -> k -> Type)
Instance details Defined in Data.Semigroupoid Methods o :: forall (j :: k0) (k1 :: k0) (i :: k0). (j :~: k1) -> (i :~: j) -> i :~: k1 #
TestEquality ((:~:) a :: k -> Type)	Since: base-4.7.0.0
Instance details Defined in Data.Type.Equality Methods testEquality :: forall (a0 :: k0) (b :: k0). (a :~: a0) -> (a :~: b) -> Maybe (a0 :~: b) #
(a ~ b, Data a) => Data (a :~: b)	Since: base-4.7.0.0
Instance details Defined in Data.Data Methods gfoldl :: (forall d b0. Data d => c (d -> b0) -> d -> c b0) -> (forall g. g -> c g) -> (a :~: b) -> c (a :~: b) # gunfold :: (forall b0 r. Data b0 => c (b0 -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (a :~: b) # toConstr :: (a :~: b) -> Constr # dataTypeOf :: (a :~: b) -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (a :~: b)) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (a :~: b)) # gmapT :: (forall b0. Data b0 => b0 -> b0) -> (a :~: b) -> a :~: b # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> (a :~: b) -> r # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> (a :~: b) -> r # gmapQ :: (forall d. Data d => d -> u) -> (a :~: b) -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> (a :~: b) -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> (a :~: b) -> m (a :~: b) # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> (a :~: b) -> m (a :~: b) # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> (a :~: b) -> m (a :~: b) #
a ~ b => Bounded (a :~: b)	Since: base-4.7.0.0
Instance details Defined in Data.Type.Equality Methods minBound :: a :~: b # maxBound :: a :~: b #
a ~ b => Enum (a :~: b)	Since: base-4.7.0.0
Instance details Defined in Data.Type.Equality Methods succ :: (a :~: b) -> a :~: b # pred :: (a :~: b) -> a :~: b # toEnum :: Int -> a :~: b # fromEnum :: (a :~: b) -> Int # enumFrom :: (a :~: b) -> [a :~: b] # enumFromThen :: (a :~: b) -> (a :~: b) -> [a :~: b] # enumFromTo :: (a :~: b) -> (a :~: b) -> [a :~: b] # enumFromThenTo :: (a :~: b) -> (a :~: b) -> (a :~: b) -> [a :~: b] #
a ~ b => Read (a :~: b)	Since: base-4.7.0.0
Instance details Defined in Data.Type.Equality Methods readsPrec :: Int -> ReadS (a :~: b) # readList :: ReadS [a :~: b] # readPrec :: ReadPrec (a :~: b) # readListPrec :: ReadPrec [a :~: b] #
Show (a :~: b)	Since: base-4.7.0.0
Instance details Defined in Data.Type.Equality Methods showsPrec :: Int -> (a :~: b) -> ShowS # show :: (a :~: b) -> String # showList :: [a :~: b] -> ShowS #
Eq (a :~: b)	Since: base-4.7.0.0
Instance details Defined in Data.Type.Equality Methods (==) :: (a :~: b) -> (a :~: b) -> Bool # (/=) :: (a :~: b) -> (a :~: b) -> Bool #
Ord (a :~: b)	Since: base-4.7.0.0
Instance details Defined in Data.Type.Equality Methods compare :: (a :~: b) -> (a :~: b) -> Ordering # (<) :: (a :~: b) -> (a :~: b) -> Bool # (<=) :: (a :~: b) -> (a :~: b) -> Bool # (>) :: (a :~: b) -> (a :~: b) -> Bool # (>=) :: (a :~: b) -> (a :~: b) -> Bool # max :: (a :~: b) -> (a :~: b) -> a :~: b # min :: (a :~: b) -> (a :~: b) -> a :~: b #

(&) :: a -> (a -> b) -> b infixl 1 #

& is a reverse application operator. This provides notational convenience. Its precedence is one higher than that of the forward application operator $, which allows & to be nested in $.

>>> 5 & (+1) & show
"6"

Since: base-4.8.0.0

(<&>) :: Functor f => f a -> (a -> b) -> f b infixl 1 #

Flipped version of <$>.

(<&>) = flip fmap

Examples

Expand

Apply (+1) to a list, a Just and a Right:

>>> Just 2 <&> (+1)
Just 3

>>> [1,2,3] <&> (+1)
[2,3,4]

>>> Right 3 <&> (+1)
Right 4

Since: base-4.11.0.0

itoList :: FoldableWithIndex i f => f a -> [(i, a)] #

Extract the key-value pairs from a structure.

When you don't need access to the indices in the result, then toList is more flexible in what it accepts.

toList ≡ map snd . itoList

ifoldlM :: (FoldableWithIndex i f, Monad m) => (i -> b -> a -> m b) -> b -> f a -> m b #

Monadic fold over the elements of a structure with an index, associating to the left.

When you don't need access to the index then foldlM is more flexible in what it accepts.

foldlM ≡ ifoldlM . const

ifoldrM :: (FoldableWithIndex i f, Monad m) => (i -> a -> b -> m b) -> b -> f a -> m b #

Monadic fold right over the elements of a structure with an index.

When you don't need access to the index then foldrM is more flexible in what it accepts.

foldrM ≡ ifoldrM . const

ifind :: FoldableWithIndex i f => (i -> a -> Bool) -> f a -> Maybe (i, a) #

Searches a container with a predicate that is also supplied the index, returning the left-most element of the structure matching the predicate, or Nothing if there is no such element.

When you don't need access to the index then find is more flexible in what it accepts.

find ≡ ifind . const

iconcatMap :: FoldableWithIndex i f => (i -> a -> [b]) -> f a -> [b] #

Concatenate the results of a function of the elements of an indexed container with access to the index.

When you don't need access to the index then concatMap is more flexible in what it accepts.

concatMap ≡ iconcatMap . const
iconcatMap ≡ ifoldMap

iforM_ :: (FoldableWithIndex i t, Monad m) => t a -> (i -> a -> m b) -> m () #

Run monadic actions for each target of an IndexedFold or IndexedTraversal with access to the index, discarding the results (with the arguments flipped).

iforM_ ≡ flip imapM_

When you don't need access to the index then forM_ is more flexible in what it accepts.

forM_ a ≡ iforM a . const

imapM_ :: (FoldableWithIndex i t, Monad m) => (i -> a -> m b) -> t a -> m () #

Run monadic actions for each target of an IndexedFold or IndexedTraversal with access to the index, discarding the results.

When you don't need access to the index then mapMOf_ is more flexible in what it accepts.

mapM_ ≡ imapM . const

ifor_ :: (FoldableWithIndex i t, Applicative f) => t a -> (i -> a -> f b) -> f () #

Traverse elements with access to the index i, discarding the results (with the arguments flipped).

ifor_ ≡ flip itraverse_

When you don't need access to the index then for_ is more flexible in what it accepts.

for_ a ≡ ifor_ a . const

itraverse_ :: (FoldableWithIndex i t, Applicative f) => (i -> a -> f b) -> t a -> f () #

Traverse elements with access to the index i, discarding the results.

When you don't need access to the index then traverse_ is more flexible in what it accepts.

traverse_ l = itraverse . const

inone :: FoldableWithIndex i f => (i -> a -> Bool) -> f a -> Bool #

Return whether or not none of the elements in a container satisfy a predicate, with access to the index i.

When you don't need access to the index then none is more flexible in what it accepts.

none ≡ inone . const
inone f ≡ not . iany f

iall :: FoldableWithIndex i f => (i -> a -> Bool) -> f a -> Bool #

Return whether or not all elements in a container satisfy a predicate, with access to the index i.

When you don't need access to the index then all is more flexible in what it accepts.

all ≡ iall . const

iany :: FoldableWithIndex i f => (i -> a -> Bool) -> f a -> Bool #

Return whether or not any element in a container satisfies a predicate, with access to the index i.

When you don't need access to the index then any is more flexible in what it accepts.

any ≡ iany . const

imapAccumL :: TraversableWithIndex i t => (i -> s -> a -> (s, b)) -> s -> t a -> (s, t b) #

Generalizes mapAccumL to add access to the index.

imapAccumL accumulates state from left to right.

mapAccumL ≡ imapAccumL . const

imapAccumR :: TraversableWithIndex i t => (i -> s -> a -> (s, b)) -> s -> t a -> (s, t b) #

Generalizes mapAccumR to add access to the index.

imapAccumR accumulates state from right to left.

mapAccumR ≡ imapAccumR . const

iforM :: (TraversableWithIndex i t, Monad m) => t a -> (i -> a -> m b) -> m (t b) #

Map each element of a structure to a monadic action, evaluate these actions from left to right, and collect the results, with access its position (and the arguments flipped).

forM a ≡ iforM a . const
iforM ≡ flip imapM

imapM :: (TraversableWithIndex i t, Monad m) => (i -> a -> m b) -> t a -> m (t b) #

Map each element of a structure to a monadic action, evaluate these actions from left to right, and collect the results, with access the index.

When you don't need access to the index mapM is more liberal in what it can accept.

mapM ≡ imapM . const

ifor :: (TraversableWithIndex i t, Applicative f) => t a -> (i -> a -> f b) -> f (t b) #

Traverse with an index (and the arguments flipped).

for a ≡ ifor a . const
ifor ≡ flip itraverse

class Functor f => FunctorWithIndex i (f :: Type -> Type) | f -> i where #

A Functor with an additional index.

Instances must satisfy a modified form of the Functor laws:

imap f . imap g ≡ imap (\i -> f i . g i)
imap (\_ a -> a) ≡ id

Minimal complete definition

Nothing

Methods

imap :: (i -> a -> b) -> f a -> f b #

Map with access to the index.

Instances

Instances details

FunctorWithIndex () Identity
Instance details Defined in WithIndex Methods imap :: (() -> a -> b) -> Identity a -> Identity b #
FunctorWithIndex () Par1
Instance details Defined in WithIndex Methods imap :: (() -> a -> b) -> Par1 a -> Par1 b #
FunctorWithIndex () Maybe
Instance details Defined in WithIndex Methods imap :: (() -> a -> b) -> Maybe a -> Maybe b #
FunctorWithIndex Int ZipList	Same instance as for `[]`.
Instance details Defined in WithIndex Methods imap :: (Int -> a -> b) -> ZipList a -> ZipList b #
FunctorWithIndex Int IntMap
Instance details Defined in WithIndex Methods imap :: (Int -> a -> b) -> IntMap a -> IntMap b #
FunctorWithIndex Int Seq	The position in the `Seq` is available as the index.
Instance details Defined in WithIndex Methods imap :: (Int -> a -> b) -> Seq a -> Seq b #
FunctorWithIndex Int NonEmpty
Instance details Defined in WithIndex Methods imap :: (Int -> a -> b) -> NonEmpty a -> NonEmpty b #
FunctorWithIndex Int []	The position in the list is available as the index.
Instance details Defined in WithIndex Methods imap :: (Int -> a -> b) -> [a] -> [b] #
FunctorWithIndex Void (Proxy :: Type -> Type)
Instance details Defined in WithIndex Methods imap :: (Void -> a -> b) -> Proxy a -> Proxy b #
FunctorWithIndex Void (U1 :: Type -> Type)
Instance details Defined in WithIndex Methods imap :: (Void -> a -> b) -> U1 a -> U1 b #
FunctorWithIndex Void (V1 :: Type -> Type)
Instance details Defined in WithIndex Methods imap :: (Void -> a -> b) -> V1 a -> V1 b #
Ix i => FunctorWithIndex i (Array i)
Instance details Defined in WithIndex Methods imap :: (i -> a -> b) -> Array i a -> Array i b #
FunctorWithIndex i (Level i)
Instance details Defined in Control.Lens.Internal.Level Methods imap :: (i -> a -> b) -> Level i a -> Level i b #
FunctorWithIndex k (Map k)
Instance details Defined in WithIndex Methods imap :: (k -> a -> b) -> Map k a -> Map k b #
FunctorWithIndex k ((,) k)
Instance details Defined in WithIndex Methods imap :: (k -> a -> b) -> (k, a) -> (k, b) #
FunctorWithIndex Void (Const e :: Type -> Type)
Instance details Defined in WithIndex Methods imap :: (Void -> a -> b) -> Const e a -> Const e b #
FunctorWithIndex Void (Constant e :: Type -> Type)
Instance details Defined in WithIndex Methods imap :: (Void -> a -> b) -> Constant e a -> Constant e b #
FunctorWithIndex Int (V n)
Instance details Defined in Linear.V Methods imap :: (Int -> a -> b) -> V n a -> V n b #
FunctorWithIndex i f => FunctorWithIndex i (Rec1 f)
Instance details Defined in WithIndex Methods imap :: (i -> a -> b) -> Rec1 f a -> Rec1 f b #
FunctorWithIndex i f => FunctorWithIndex i (Backwards f)
Instance details Defined in WithIndex Methods imap :: (i -> a -> b) -> Backwards f a -> Backwards f b #
FunctorWithIndex i m => FunctorWithIndex i (IdentityT m)
Instance details Defined in WithIndex Methods imap :: (i -> a -> b) -> IdentityT m a -> IdentityT m b #
FunctorWithIndex i f => FunctorWithIndex i (Reverse f)
Instance details Defined in WithIndex Methods imap :: (i -> a -> b) -> Reverse f a -> Reverse f b #
FunctorWithIndex Void (K1 i c :: Type -> Type)
Instance details Defined in WithIndex Methods imap :: (Void -> a -> b) -> K1 i c a -> K1 i c b #
FunctorWithIndex i (Magma i t b)
Instance details Defined in Control.Lens.Internal.Magma Methods imap :: (i -> a -> b0) -> Magma i t b a -> Magma i t b b0 #
FunctorWithIndex r ((->) r)
Instance details Defined in WithIndex Methods imap :: (r -> a -> b) -> (r -> a) -> r -> b #
FunctorWithIndex (E Plucker) Plucker
Instance details Defined in Linear.Plucker Methods imap :: (E Plucker -> a -> b) -> Plucker a -> Plucker b #
FunctorWithIndex (E Quaternion) Quaternion
Instance details Defined in Linear.Quaternion Methods imap :: (E Quaternion -> a -> b) -> Quaternion a -> Quaternion b #
FunctorWithIndex (E V0) V0
Instance details Defined in Linear.V0 Methods imap :: (E V0 -> a -> b) -> V0 a -> V0 b #
FunctorWithIndex (E V1) V1
Instance details Defined in Linear.V1 Methods imap :: (E V1 -> a -> b) -> V1 a -> V1 b #
FunctorWithIndex (E V2) V2
Instance details Defined in Linear.V2 Methods imap :: (E V2 -> a -> b) -> V2 a -> V2 b #
FunctorWithIndex (E V3) V3
Instance details Defined in Linear.V3 Methods imap :: (E V3 -> a -> b) -> V3 a -> V3 b #
FunctorWithIndex (E V4) V4
Instance details Defined in Linear.V4 Methods imap :: (E V4 -> a -> b) -> V4 a -> V4 b #
FunctorWithIndex [Int] Tree
Instance details Defined in WithIndex Methods imap :: ([Int] -> a -> b) -> Tree a -> Tree b #
FunctorWithIndex i f => FunctorWithIndex [i] (Cofree f)
Instance details Defined in Control.Comonad.Cofree Methods imap :: ([i] -> a -> b) -> Cofree f a -> Cofree f b #
FunctorWithIndex i f => FunctorWithIndex [i] (Free f)
Instance details Defined in Control.Monad.Free Methods imap :: ([i] -> a -> b) -> Free f a -> Free f b #
FunctorWithIndex i m => FunctorWithIndex (e, i) (ReaderT e m)
Instance details Defined in WithIndex Methods imap :: ((e, i) -> a -> b) -> ReaderT e m a -> ReaderT e m b #
FunctorWithIndex i w => FunctorWithIndex (s, i) (TracedT s w)
Instance details Defined in Control.Comonad.Trans.Traced Methods imap :: ((s, i) -> a -> b) -> TracedT s w a -> TracedT s w b #
(FunctorWithIndex i f, FunctorWithIndex j g) => FunctorWithIndex (Either i j) (Product f g)
Instance details Defined in WithIndex Methods imap :: (Either i j -> a -> b) -> Product f g a -> Product f g b #
(FunctorWithIndex i f, FunctorWithIndex j g) => FunctorWithIndex (Either i j) (Sum f g)
Instance details Defined in WithIndex Methods imap :: (Either i j -> a -> b) -> Sum f g a -> Sum f g b #
(FunctorWithIndex i f, FunctorWithIndex j g) => FunctorWithIndex (Either i j) (f :*: g)
Instance details Defined in WithIndex Methods imap :: (Either i j -> a -> b) -> (f :: g) a -> (f :: g) b #
(FunctorWithIndex i f, FunctorWithIndex j g) => FunctorWithIndex (Either i j) (f :+: g)
Instance details Defined in WithIndex Methods imap :: (Either i j -> a -> b) -> (f :+: g) a -> (f :+: g) b #
(FunctorWithIndex i f, FunctorWithIndex j g) => FunctorWithIndex (i, j) (Compose f g)
Instance details Defined in WithIndex Methods imap :: ((i, j) -> a -> b) -> Compose f g a -> Compose f g b #
(FunctorWithIndex i f, FunctorWithIndex j g) => FunctorWithIndex (i, j) (f :.: g)
Instance details Defined in WithIndex Methods imap :: ((i, j) -> a -> b) -> (f :.: g) a -> (f :.: g) b #

class Foldable f => FoldableWithIndex i (f :: Type -> Type) | f -> i where #

A container that supports folding with an additional index.

Minimal complete definition

Nothing

Methods

ifoldMap :: Monoid m => (i -> a -> m) -> f a -> m #

Fold a container by mapping value to an arbitrary Monoid with access to the index i.

When you don't need access to the index then foldMap is more flexible in what it accepts.

foldMap ≡ ifoldMap . const

ifoldMap' :: Monoid m => (i -> a -> m) -> f a -> m #

A variant of ifoldMap that is strict in the accumulator.

When you don't need access to the index then foldMap' is more flexible in what it accepts.

foldMap' ≡ ifoldMap' . const

ifoldr :: (i -> a -> b -> b) -> b -> f a -> b #

Right-associative fold of an indexed container with access to the index i.

When you don't need access to the index then foldr is more flexible in what it accepts.

foldr ≡ ifoldr . const

ifoldl :: (i -> b -> a -> b) -> b -> f a -> b #

Left-associative fold of an indexed container with access to the index i.

When you don't need access to the index then foldl is more flexible in what it accepts.

foldl ≡ ifoldl . const

ifoldr' :: (i -> a -> b -> b) -> b -> f a -> b #

Strictly fold right over the elements of a structure with access to the index i.

When you don't need access to the index then foldr' is more flexible in what it accepts.

foldr' ≡ ifoldr' . const

ifoldl' :: (i -> b -> a -> b) -> b -> f a -> b #

Fold over the elements of a structure with an index, associating to the left, but strictly.

When you don't need access to the index then foldlOf' is more flexible in what it accepts.

foldl' l ≡ ifoldl' l . const

Instances

Instances details

FoldableWithIndex () Identity
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (() -> a -> m) -> Identity a -> m # ifoldMap' :: Monoid m => (() -> a -> m) -> Identity a -> m # ifoldr :: (() -> a -> b -> b) -> b -> Identity a -> b # ifoldl :: (() -> b -> a -> b) -> b -> Identity a -> b # ifoldr' :: (() -> a -> b -> b) -> b -> Identity a -> b # ifoldl' :: (() -> b -> a -> b) -> b -> Identity a -> b #
FoldableWithIndex () Par1
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (() -> a -> m) -> Par1 a -> m # ifoldMap' :: Monoid m => (() -> a -> m) -> Par1 a -> m # ifoldr :: (() -> a -> b -> b) -> b -> Par1 a -> b # ifoldl :: (() -> b -> a -> b) -> b -> Par1 a -> b # ifoldr' :: (() -> a -> b -> b) -> b -> Par1 a -> b # ifoldl' :: (() -> b -> a -> b) -> b -> Par1 a -> b #
FoldableWithIndex () Maybe
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (() -> a -> m) -> Maybe a -> m # ifoldMap' :: Monoid m => (() -> a -> m) -> Maybe a -> m # ifoldr :: (() -> a -> b -> b) -> b -> Maybe a -> b # ifoldl :: (() -> b -> a -> b) -> b -> Maybe a -> b # ifoldr' :: (() -> a -> b -> b) -> b -> Maybe a -> b # ifoldl' :: (() -> b -> a -> b) -> b -> Maybe a -> b #
FoldableWithIndex Int ZipList
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Int -> a -> m) -> ZipList a -> m # ifoldMap' :: Monoid m => (Int -> a -> m) -> ZipList a -> m # ifoldr :: (Int -> a -> b -> b) -> b -> ZipList a -> b # ifoldl :: (Int -> b -> a -> b) -> b -> ZipList a -> b # ifoldr' :: (Int -> a -> b -> b) -> b -> ZipList a -> b # ifoldl' :: (Int -> b -> a -> b) -> b -> ZipList a -> b #
FoldableWithIndex Int IntMap
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Int -> a -> m) -> IntMap a -> m # ifoldMap' :: Monoid m => (Int -> a -> m) -> IntMap a -> m # ifoldr :: (Int -> a -> b -> b) -> b -> IntMap a -> b # ifoldl :: (Int -> b -> a -> b) -> b -> IntMap a -> b # ifoldr' :: (Int -> a -> b -> b) -> b -> IntMap a -> b # ifoldl' :: (Int -> b -> a -> b) -> b -> IntMap a -> b #
FoldableWithIndex Int Seq
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Int -> a -> m) -> Seq a -> m # ifoldMap' :: Monoid m => (Int -> a -> m) -> Seq a -> m # ifoldr :: (Int -> a -> b -> b) -> b -> Seq a -> b # ifoldl :: (Int -> b -> a -> b) -> b -> Seq a -> b # ifoldr' :: (Int -> a -> b -> b) -> b -> Seq a -> b # ifoldl' :: (Int -> b -> a -> b) -> b -> Seq a -> b #
FoldableWithIndex Int NonEmpty
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Int -> a -> m) -> NonEmpty a -> m # ifoldMap' :: Monoid m => (Int -> a -> m) -> NonEmpty a -> m # ifoldr :: (Int -> a -> b -> b) -> b -> NonEmpty a -> b # ifoldl :: (Int -> b -> a -> b) -> b -> NonEmpty a -> b # ifoldr' :: (Int -> a -> b -> b) -> b -> NonEmpty a -> b # ifoldl' :: (Int -> b -> a -> b) -> b -> NonEmpty a -> b #
FoldableWithIndex Int []
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Int -> a -> m) -> [a] -> m # ifoldMap' :: Monoid m => (Int -> a -> m) -> [a] -> m # ifoldr :: (Int -> a -> b -> b) -> b -> [a] -> b # ifoldl :: (Int -> b -> a -> b) -> b -> [a] -> b # ifoldr' :: (Int -> a -> b -> b) -> b -> [a] -> b # ifoldl' :: (Int -> b -> a -> b) -> b -> [a] -> b #
FoldableWithIndex Void (Proxy :: Type -> Type)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Void -> a -> m) -> Proxy a -> m # ifoldMap' :: Monoid m => (Void -> a -> m) -> Proxy a -> m # ifoldr :: (Void -> a -> b -> b) -> b -> Proxy a -> b # ifoldl :: (Void -> b -> a -> b) -> b -> Proxy a -> b # ifoldr' :: (Void -> a -> b -> b) -> b -> Proxy a -> b # ifoldl' :: (Void -> b -> a -> b) -> b -> Proxy a -> b #
FoldableWithIndex Void (U1 :: Type -> Type)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Void -> a -> m) -> U1 a -> m # ifoldMap' :: Monoid m => (Void -> a -> m) -> U1 a -> m # ifoldr :: (Void -> a -> b -> b) -> b -> U1 a -> b # ifoldl :: (Void -> b -> a -> b) -> b -> U1 a -> b # ifoldr' :: (Void -> a -> b -> b) -> b -> U1 a -> b # ifoldl' :: (Void -> b -> a -> b) -> b -> U1 a -> b #
FoldableWithIndex Void (V1 :: Type -> Type)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Void -> a -> m) -> V1 a -> m # ifoldMap' :: Monoid m => (Void -> a -> m) -> V1 a -> m # ifoldr :: (Void -> a -> b -> b) -> b -> V1 a -> b # ifoldl :: (Void -> b -> a -> b) -> b -> V1 a -> b # ifoldr' :: (Void -> a -> b -> b) -> b -> V1 a -> b # ifoldl' :: (Void -> b -> a -> b) -> b -> V1 a -> b #
Ix i => FoldableWithIndex i (Array i)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (i -> a -> m) -> Array i a -> m # ifoldMap' :: Monoid m => (i -> a -> m) -> Array i a -> m # ifoldr :: (i -> a -> b -> b) -> b -> Array i a -> b # ifoldl :: (i -> b -> a -> b) -> b -> Array i a -> b # ifoldr' :: (i -> a -> b -> b) -> b -> Array i a -> b # ifoldl' :: (i -> b -> a -> b) -> b -> Array i a -> b #
FoldableWithIndex i (Level i)
Instance details Defined in Control.Lens.Internal.Level Methods ifoldMap :: Monoid m => (i -> a -> m) -> Level i a -> m # ifoldMap' :: Monoid m => (i -> a -> m) -> Level i a -> m # ifoldr :: (i -> a -> b -> b) -> b -> Level i a -> b # ifoldl :: (i -> b -> a -> b) -> b -> Level i a -> b # ifoldr' :: (i -> a -> b -> b) -> b -> Level i a -> b # ifoldl' :: (i -> b -> a -> b) -> b -> Level i a -> b #
FoldableWithIndex k (Map k)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (k -> a -> m) -> Map k a -> m # ifoldMap' :: Monoid m => (k -> a -> m) -> Map k a -> m # ifoldr :: (k -> a -> b -> b) -> b -> Map k a -> b # ifoldl :: (k -> b -> a -> b) -> b -> Map k a -> b # ifoldr' :: (k -> a -> b -> b) -> b -> Map k a -> b # ifoldl' :: (k -> b -> a -> b) -> b -> Map k a -> b #
FoldableWithIndex k ((,) k)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (k -> a -> m) -> (k, a) -> m # ifoldMap' :: Monoid m => (k -> a -> m) -> (k, a) -> m # ifoldr :: (k -> a -> b -> b) -> b -> (k, a) -> b # ifoldl :: (k -> b -> a -> b) -> b -> (k, a) -> b # ifoldr' :: (k -> a -> b -> b) -> b -> (k, a) -> b # ifoldl' :: (k -> b -> a -> b) -> b -> (k, a) -> b #
FoldableWithIndex Void (Const e :: Type -> Type)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Void -> a -> m) -> Const e a -> m # ifoldMap' :: Monoid m => (Void -> a -> m) -> Const e a -> m # ifoldr :: (Void -> a -> b -> b) -> b -> Const e a -> b # ifoldl :: (Void -> b -> a -> b) -> b -> Const e a -> b # ifoldr' :: (Void -> a -> b -> b) -> b -> Const e a -> b # ifoldl' :: (Void -> b -> a -> b) -> b -> Const e a -> b #
FoldableWithIndex Void (Constant e :: Type -> Type)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Void -> a -> m) -> Constant e a -> m # ifoldMap' :: Monoid m => (Void -> a -> m) -> Constant e a -> m # ifoldr :: (Void -> a -> b -> b) -> b -> Constant e a -> b # ifoldl :: (Void -> b -> a -> b) -> b -> Constant e a -> b # ifoldr' :: (Void -> a -> b -> b) -> b -> Constant e a -> b # ifoldl' :: (Void -> b -> a -> b) -> b -> Constant e a -> b #
FoldableWithIndex Int (V n)
Instance details Defined in Linear.V Methods ifoldMap :: Monoid m => (Int -> a -> m) -> V n a -> m # ifoldMap' :: Monoid m => (Int -> a -> m) -> V n a -> m # ifoldr :: (Int -> a -> b -> b) -> b -> V n a -> b # ifoldl :: (Int -> b -> a -> b) -> b -> V n a -> b # ifoldr' :: (Int -> a -> b -> b) -> b -> V n a -> b # ifoldl' :: (Int -> b -> a -> b) -> b -> V n a -> b #
FoldableWithIndex i f => FoldableWithIndex i (Rec1 f)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (i -> a -> m) -> Rec1 f a -> m # ifoldMap' :: Monoid m => (i -> a -> m) -> Rec1 f a -> m # ifoldr :: (i -> a -> b -> b) -> b -> Rec1 f a -> b # ifoldl :: (i -> b -> a -> b) -> b -> Rec1 f a -> b # ifoldr' :: (i -> a -> b -> b) -> b -> Rec1 f a -> b # ifoldl' :: (i -> b -> a -> b) -> b -> Rec1 f a -> b #
FoldableWithIndex i f => FoldableWithIndex i (Backwards f)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (i -> a -> m) -> Backwards f a -> m # ifoldMap' :: Monoid m => (i -> a -> m) -> Backwards f a -> m # ifoldr :: (i -> a -> b -> b) -> b -> Backwards f a -> b # ifoldl :: (i -> b -> a -> b) -> b -> Backwards f a -> b # ifoldr' :: (i -> a -> b -> b) -> b -> Backwards f a -> b # ifoldl' :: (i -> b -> a -> b) -> b -> Backwards f a -> b #
FoldableWithIndex i m => FoldableWithIndex i (IdentityT m)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m0 => (i -> a -> m0) -> IdentityT m a -> m0 # ifoldMap' :: Monoid m0 => (i -> a -> m0) -> IdentityT m a -> m0 # ifoldr :: (i -> a -> b -> b) -> b -> IdentityT m a -> b # ifoldl :: (i -> b -> a -> b) -> b -> IdentityT m a -> b # ifoldr' :: (i -> a -> b -> b) -> b -> IdentityT m a -> b # ifoldl' :: (i -> b -> a -> b) -> b -> IdentityT m a -> b #
FoldableWithIndex i f => FoldableWithIndex i (Reverse f)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (i -> a -> m) -> Reverse f a -> m # ifoldMap' :: Monoid m => (i -> a -> m) -> Reverse f a -> m # ifoldr :: (i -> a -> b -> b) -> b -> Reverse f a -> b # ifoldl :: (i -> b -> a -> b) -> b -> Reverse f a -> b # ifoldr' :: (i -> a -> b -> b) -> b -> Reverse f a -> b # ifoldl' :: (i -> b -> a -> b) -> b -> Reverse f a -> b #
FoldableWithIndex Void (K1 i c :: Type -> Type)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Void -> a -> m) -> K1 i c a -> m # ifoldMap' :: Monoid m => (Void -> a -> m) -> K1 i c a -> m # ifoldr :: (Void -> a -> b -> b) -> b -> K1 i c a -> b # ifoldl :: (Void -> b -> a -> b) -> b -> K1 i c a -> b # ifoldr' :: (Void -> a -> b -> b) -> b -> K1 i c a -> b # ifoldl' :: (Void -> b -> a -> b) -> b -> K1 i c a -> b #
FoldableWithIndex i (Magma i t b)
Instance details Defined in Control.Lens.Internal.Magma Methods ifoldMap :: Monoid m => (i -> a -> m) -> Magma i t b a -> m # ifoldMap' :: Monoid m => (i -> a -> m) -> Magma i t b a -> m # ifoldr :: (i -> a -> b0 -> b0) -> b0 -> Magma i t b a -> b0 # ifoldl :: (i -> b0 -> a -> b0) -> b0 -> Magma i t b a -> b0 # ifoldr' :: (i -> a -> b0 -> b0) -> b0 -> Magma i t b a -> b0 # ifoldl' :: (i -> b0 -> a -> b0) -> b0 -> Magma i t b a -> b0 #
FoldableWithIndex (E Plucker) Plucker
Instance details Defined in Linear.Plucker Methods ifoldMap :: Monoid m => (E Plucker -> a -> m) -> Plucker a -> m # ifoldMap' :: Monoid m => (E Plucker -> a -> m) -> Plucker a -> m # ifoldr :: (E Plucker -> a -> b -> b) -> b -> Plucker a -> b # ifoldl :: (E Plucker -> b -> a -> b) -> b -> Plucker a -> b # ifoldr' :: (E Plucker -> a -> b -> b) -> b -> Plucker a -> b # ifoldl' :: (E Plucker -> b -> a -> b) -> b -> Plucker a -> b #
FoldableWithIndex (E Quaternion) Quaternion
Instance details Defined in Linear.Quaternion Methods ifoldMap :: Monoid m => (E Quaternion -> a -> m) -> Quaternion a -> m # ifoldMap' :: Monoid m => (E Quaternion -> a -> m) -> Quaternion a -> m # ifoldr :: (E Quaternion -> a -> b -> b) -> b -> Quaternion a -> b # ifoldl :: (E Quaternion -> b -> a -> b) -> b -> Quaternion a -> b # ifoldr' :: (E Quaternion -> a -> b -> b) -> b -> Quaternion a -> b # ifoldl' :: (E Quaternion -> b -> a -> b) -> b -> Quaternion a -> b #
FoldableWithIndex (E V0) V0
Instance details Defined in Linear.V0 Methods ifoldMap :: Monoid m => (E V0 -> a -> m) -> V0 a -> m # ifoldMap' :: Monoid m => (E V0 -> a -> m) -> V0 a -> m # ifoldr :: (E V0 -> a -> b -> b) -> b -> V0 a -> b # ifoldl :: (E V0 -> b -> a -> b) -> b -> V0 a -> b # ifoldr' :: (E V0 -> a -> b -> b) -> b -> V0 a -> b # ifoldl' :: (E V0 -> b -> a -> b) -> b -> V0 a -> b #
FoldableWithIndex (E V1) V1
Instance details Defined in Linear.V1 Methods ifoldMap :: Monoid m => (E V1 -> a -> m) -> V1 a -> m # ifoldMap' :: Monoid m => (E V1 -> a -> m) -> V1 a -> m # ifoldr :: (E V1 -> a -> b -> b) -> b -> V1 a -> b # ifoldl :: (E V1 -> b -> a -> b) -> b -> V1 a -> b # ifoldr' :: (E V1 -> a -> b -> b) -> b -> V1 a -> b # ifoldl' :: (E V1 -> b -> a -> b) -> b -> V1 a -> b #
FoldableWithIndex (E V2) V2
Instance details Defined in Linear.V2 Methods ifoldMap :: Monoid m => (E V2 -> a -> m) -> V2 a -> m # ifoldMap' :: Monoid m => (E V2 -> a -> m) -> V2 a -> m # ifoldr :: (E V2 -> a -> b -> b) -> b -> V2 a -> b # ifoldl :: (E V2 -> b -> a -> b) -> b -> V2 a -> b # ifoldr' :: (E V2 -> a -> b -> b) -> b -> V2 a -> b # ifoldl' :: (E V2 -> b -> a -> b) -> b -> V2 a -> b #
FoldableWithIndex (E V3) V3
Instance details Defined in Linear.V3 Methods ifoldMap :: Monoid m => (E V3 -> a -> m) -> V3 a -> m # ifoldMap' :: Monoid m => (E V3 -> a -> m) -> V3 a -> m # ifoldr :: (E V3 -> a -> b -> b) -> b -> V3 a -> b # ifoldl :: (E V3 -> b -> a -> b) -> b -> V3 a -> b # ifoldr' :: (E V3 -> a -> b -> b) -> b -> V3 a -> b # ifoldl' :: (E V3 -> b -> a -> b) -> b -> V3 a -> b #
FoldableWithIndex (E V4) V4
Instance details Defined in Linear.V4 Methods ifoldMap :: Monoid m => (E V4 -> a -> m) -> V4 a -> m # ifoldMap' :: Monoid m => (E V4 -> a -> m) -> V4 a -> m # ifoldr :: (E V4 -> a -> b -> b) -> b -> V4 a -> b # ifoldl :: (E V4 -> b -> a -> b) -> b -> V4 a -> b # ifoldr' :: (E V4 -> a -> b -> b) -> b -> V4 a -> b # ifoldl' :: (E V4 -> b -> a -> b) -> b -> V4 a -> b #
FoldableWithIndex [Int] Tree
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => ([Int] -> a -> m) -> Tree a -> m # ifoldMap' :: Monoid m => ([Int] -> a -> m) -> Tree a -> m # ifoldr :: ([Int] -> a -> b -> b) -> b -> Tree a -> b # ifoldl :: ([Int] -> b -> a -> b) -> b -> Tree a -> b # ifoldr' :: ([Int] -> a -> b -> b) -> b -> Tree a -> b # ifoldl' :: ([Int] -> b -> a -> b) -> b -> Tree a -> b #
FoldableWithIndex i f => FoldableWithIndex [i] (Cofree f)
Instance details Defined in Control.Comonad.Cofree Methods ifoldMap :: Monoid m => ([i] -> a -> m) -> Cofree f a -> m # ifoldMap' :: Monoid m => ([i] -> a -> m) -> Cofree f a -> m # ifoldr :: ([i] -> a -> b -> b) -> b -> Cofree f a -> b # ifoldl :: ([i] -> b -> a -> b) -> b -> Cofree f a -> b # ifoldr' :: ([i] -> a -> b -> b) -> b -> Cofree f a -> b # ifoldl' :: ([i] -> b -> a -> b) -> b -> Cofree f a -> b #
FoldableWithIndex i f => FoldableWithIndex [i] (Free f)
Instance details Defined in Control.Monad.Free Methods ifoldMap :: Monoid m => ([i] -> a -> m) -> Free f a -> m # ifoldMap' :: Monoid m => ([i] -> a -> m) -> Free f a -> m # ifoldr :: ([i] -> a -> b -> b) -> b -> Free f a -> b # ifoldl :: ([i] -> b -> a -> b) -> b -> Free f a -> b # ifoldr' :: ([i] -> a -> b -> b) -> b -> Free f a -> b # ifoldl' :: ([i] -> b -> a -> b) -> b -> Free f a -> b #
(FoldableWithIndex i f, FoldableWithIndex j g) => FoldableWithIndex (Either i j) (Product f g)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Either i j -> a -> m) -> Product f g a -> m # ifoldMap' :: Monoid m => (Either i j -> a -> m) -> Product f g a -> m # ifoldr :: (Either i j -> a -> b -> b) -> b -> Product f g a -> b # ifoldl :: (Either i j -> b -> a -> b) -> b -> Product f g a -> b # ifoldr' :: (Either i j -> a -> b -> b) -> b -> Product f g a -> b # ifoldl' :: (Either i j -> b -> a -> b) -> b -> Product f g a -> b #
(FoldableWithIndex i f, FoldableWithIndex j g) => FoldableWithIndex (Either i j) (Sum f g)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Either i j -> a -> m) -> Sum f g a -> m # ifoldMap' :: Monoid m => (Either i j -> a -> m) -> Sum f g a -> m # ifoldr :: (Either i j -> a -> b -> b) -> b -> Sum f g a -> b # ifoldl :: (Either i j -> b -> a -> b) -> b -> Sum f g a -> b # ifoldr' :: (Either i j -> a -> b -> b) -> b -> Sum f g a -> b # ifoldl' :: (Either i j -> b -> a -> b) -> b -> Sum f g a -> b #
(FoldableWithIndex i f, FoldableWithIndex j g) => FoldableWithIndex (Either i j) (f :*: g)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Either i j -> a -> m) -> (f :: g) a -> m # ifoldMap' :: Monoid m => (Either i j -> a -> m) -> (f :: g) a -> m # ifoldr :: (Either i j -> a -> b -> b) -> b -> (f :: g) a -> b # ifoldl :: (Either i j -> b -> a -> b) -> b -> (f :: g) a -> b # ifoldr' :: (Either i j -> a -> b -> b) -> b -> (f :: g) a -> b # ifoldl' :: (Either i j -> b -> a -> b) -> b -> (f :: g) a -> b #
(FoldableWithIndex i f, FoldableWithIndex j g) => FoldableWithIndex (Either i j) (f :+: g)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Either i j -> a -> m) -> (f :+: g) a -> m # ifoldMap' :: Monoid m => (Either i j -> a -> m) -> (f :+: g) a -> m # ifoldr :: (Either i j -> a -> b -> b) -> b -> (f :+: g) a -> b # ifoldl :: (Either i j -> b -> a -> b) -> b -> (f :+: g) a -> b # ifoldr' :: (Either i j -> a -> b -> b) -> b -> (f :+: g) a -> b # ifoldl' :: (Either i j -> b -> a -> b) -> b -> (f :+: g) a -> b #
(FoldableWithIndex i f, FoldableWithIndex j g) => FoldableWithIndex (i, j) (Compose f g)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => ((i, j) -> a -> m) -> Compose f g a -> m # ifoldMap' :: Monoid m => ((i, j) -> a -> m) -> Compose f g a -> m # ifoldr :: ((i, j) -> a -> b -> b) -> b -> Compose f g a -> b # ifoldl :: ((i, j) -> b -> a -> b) -> b -> Compose f g a -> b # ifoldr' :: ((i, j) -> a -> b -> b) -> b -> Compose f g a -> b # ifoldl' :: ((i, j) -> b -> a -> b) -> b -> Compose f g a -> b #
(FoldableWithIndex i f, FoldableWithIndex j g) => FoldableWithIndex (i, j) (f :.: g)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => ((i, j) -> a -> m) -> (f :.: g) a -> m # ifoldMap' :: Monoid m => ((i, j) -> a -> m) -> (f :.: g) a -> m # ifoldr :: ((i, j) -> a -> b -> b) -> b -> (f :.: g) a -> b # ifoldl :: ((i, j) -> b -> a -> b) -> b -> (f :.: g) a -> b # ifoldr' :: ((i, j) -> a -> b -> b) -> b -> (f :.: g) a -> b # ifoldl' :: ((i, j) -> b -> a -> b) -> b -> (f :.: g) a -> b #

class (FunctorWithIndex i t, FoldableWithIndex i t, Traversable t) => TraversableWithIndex i (t :: Type -> Type) | t -> i where #

A Traversable with an additional index.

An instance must satisfy a (modified) form of the Traversable laws:

itraverse (const Identity) ≡ Identity
fmap (itraverse f) . itraverse g ≡ getCompose . itraverse (\i -> Compose . fmap (f i) . g i)

Minimal complete definition

Nothing

Methods

itraverse :: Applicative f => (i -> a -> f b) -> t a -> f (t b) #

Traverse an indexed container.

itraverse ≡ itraverseOf itraversed

Instances

Instances details

TraversableWithIndex () Identity
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (() -> a -> f b) -> Identity a -> f (Identity b) #
TraversableWithIndex () Par1
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (() -> a -> f b) -> Par1 a -> f (Par1 b) #
TraversableWithIndex () Maybe
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (() -> a -> f b) -> Maybe a -> f (Maybe b) #
TraversableWithIndex Int ZipList
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (Int -> a -> f b) -> ZipList a -> f (ZipList b) #
TraversableWithIndex Int IntMap
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (Int -> a -> f b) -> IntMap a -> f (IntMap b) #
TraversableWithIndex Int Seq
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (Int -> a -> f b) -> Seq a -> f (Seq b) #
TraversableWithIndex Int NonEmpty
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (Int -> a -> f b) -> NonEmpty a -> f (NonEmpty b) #
TraversableWithIndex Int []
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (Int -> a -> f b) -> [a] -> f [b] #
TraversableWithIndex Void (Proxy :: Type -> Type)
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (Void -> a -> f b) -> Proxy a -> f (Proxy b) #
TraversableWithIndex Void (U1 :: Type -> Type)
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (Void -> a -> f b) -> U1 a -> f (U1 b) #
TraversableWithIndex Void (V1 :: Type -> Type)
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (Void -> a -> f b) -> V1 a -> f (V1 b) #
Ix i => TraversableWithIndex i (Array i)
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (i -> a -> f b) -> Array i a -> f (Array i b) #
TraversableWithIndex i (Level i)
Instance details Defined in Control.Lens.Internal.Level Methods itraverse :: Applicative f => (i -> a -> f b) -> Level i a -> f (Level i b) #
TraversableWithIndex k (Map k)
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (k -> a -> f b) -> Map k a -> f (Map k b) #
TraversableWithIndex k ((,) k)
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (k -> a -> f b) -> (k, a) -> f (k, b) #
TraversableWithIndex Void (Const e :: Type -> Type)
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (Void -> a -> f b) -> Const e a -> f (Const e b) #
TraversableWithIndex Void (Constant e :: Type -> Type)
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (Void -> a -> f b) -> Constant e a -> f (Constant e b) #
TraversableWithIndex Int (V n)
Instance details Defined in Linear.V Methods itraverse :: Applicative f => (Int -> a -> f b) -> V n a -> f (V n b) #
TraversableWithIndex i f => TraversableWithIndex i (Rec1 f)
Instance details Defined in WithIndex Methods itraverse :: Applicative f0 => (i -> a -> f0 b) -> Rec1 f a -> f0 (Rec1 f b) #
TraversableWithIndex i f => TraversableWithIndex i (Backwards f)
Instance details Defined in WithIndex Methods itraverse :: Applicative f0 => (i -> a -> f0 b) -> Backwards f a -> f0 (Backwards f b) #
TraversableWithIndex i m => TraversableWithIndex i (IdentityT m)
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (i -> a -> f b) -> IdentityT m a -> f (IdentityT m b) #
TraversableWithIndex i f => TraversableWithIndex i (Reverse f)
Instance details Defined in WithIndex Methods itraverse :: Applicative f0 => (i -> a -> f0 b) -> Reverse f a -> f0 (Reverse f b) #
TraversableWithIndex Void (K1 i c :: Type -> Type)
Instance details Defined in WithIndex Methods itraverse :: Applicative f => (Void -> a -> f b) -> K1 i c a -> f (K1 i c b) #
TraversableWithIndex i (Magma i t b)
Instance details Defined in Control.Lens.Internal.Magma Methods itraverse :: Applicative f => (i -> a -> f b0) -> Magma i t b a -> f (Magma i t b b0) #
TraversableWithIndex (E Plucker) Plucker
Instance details Defined in Linear.Plucker Methods itraverse :: Applicative f => (E Plucker -> a -> f b) -> Plucker a -> f (Plucker b) #
TraversableWithIndex (E Quaternion) Quaternion
Instance details Defined in Linear.Quaternion Methods itraverse :: Applicative f => (E Quaternion -> a -> f b) -> Quaternion a -> f (Quaternion b) #
TraversableWithIndex (E V0) V0
Instance details Defined in Linear.V0 Methods itraverse :: Applicative f => (E V0 -> a -> f b) -> V0 a -> f (V0 b) #
TraversableWithIndex (E V1) V1
Instance details Defined in Linear.V1 Methods itraverse :: Applicative f => (E V1 -> a -> f b) -> V1 a -> f (V1 b) #
TraversableWithIndex (E V2) V2
Instance details Defined in Linear.V2 Methods itraverse :: Applicative f => (E V2 -> a -> f b) -> V2 a -> f (V2 b) #
TraversableWithIndex (E V3) V3
Instance details Defined in Linear.V3 Methods itraverse :: Applicative f => (E V3 -> a -> f b) -> V3 a -> f (V3 b) #
TraversableWithIndex (E V4) V4
Instance details Defined in Linear.V4 Methods itraverse :: Applicative f => (E V4 -> a -> f b) -> V4 a -> f (V4 b) #
TraversableWithIndex [Int] Tree
Instance details Defined in WithIndex Methods itraverse :: Applicative f => ([Int] -> a -> f b) -> Tree a -> f (Tree b) #
TraversableWithIndex i f => TraversableWithIndex [i] (Cofree f)
Instance details Defined in Control.Comonad.Cofree Methods itraverse :: Applicative f0 => ([i] -> a -> f0 b) -> Cofree f a -> f0 (Cofree f b) #
TraversableWithIndex i f => TraversableWithIndex [i] (Free f)
Instance details Defined in Control.Monad.Free Methods itraverse :: Applicative f0 => ([i] -> a -> f0 b) -> Free f a -> f0 (Free f b) #
(TraversableWithIndex i f, TraversableWithIndex j g) => TraversableWithIndex (Either i j) (Product f g)
Instance details Defined in WithIndex Methods itraverse :: Applicative f0 => (Either i j -> a -> f0 b) -> Product f g a -> f0 (Product f g b) #
(TraversableWithIndex i f, TraversableWithIndex j g) => TraversableWithIndex (Either i j) (Sum f g)
Instance details Defined in WithIndex Methods itraverse :: Applicative f0 => (Either i j -> a -> f0 b) -> Sum f g a -> f0 (Sum f g b) #
(TraversableWithIndex i f, TraversableWithIndex j g) => TraversableWithIndex (Either i j) (f :*: g)
Instance details Defined in WithIndex Methods itraverse :: Applicative f0 => (Either i j -> a -> f0 b) -> (f :: g) a -> f0 ((f :: g) b) #
(TraversableWithIndex i f, TraversableWithIndex j g) => TraversableWithIndex (Either i j) (f :+: g)
Instance details Defined in WithIndex Methods itraverse :: Applicative f0 => (Either i j -> a -> f0 b) -> (f :+: g) a -> f0 ((f :+: g) b) #
(TraversableWithIndex i f, TraversableWithIndex j g) => TraversableWithIndex (i, j) (Compose f g)
Instance details Defined in WithIndex Methods itraverse :: Applicative f0 => ((i, j) -> a -> f0 b) -> Compose f g a -> f0 (Compose f g b) #
(TraversableWithIndex i f, TraversableWithIndex j g) => TraversableWithIndex (i, j) (f :.: g)
Instance details Defined in WithIndex Methods itraverse :: Applicative f0 => ((i, j) -> a -> f0 b) -> (f :.: g) a -> f0 ((f :.: g) b) #

class Profunctor (p :: Type -> Type -> Type) where #

Formally, the class Profunctor represents a profunctor from Hask -> Hask.

Intuitively it is a bifunctor where the first argument is contravariant and the second argument is covariant.

You can define a Profunctor by either defining dimap or by defining both lmap and rmap.

If you supply dimap, you should ensure that:

dimap id id ≡ id

If you supply lmap and rmap, ensure:

lmap id ≡ id
rmap id ≡ id

If you supply both, you should also ensure:

dimap f g ≡ lmap f . rmap g

These ensure by parametricity:

dimap (f . g) (h . i) ≡ dimap g h . dimap f i
lmap (f . g) ≡ lmap g . lmap f
rmap (f . g) ≡ rmap f . rmap g

Minimal complete definition

dimap | lmap, rmap

Methods

dimap :: (a -> b) -> (c -> d) -> p b c -> p a d #

Map over both arguments at the same time.

dimap f g ≡ lmap f . rmap g

lmap :: (a -> b) -> p b c -> p a c #

Map the first argument contravariantly.

lmap f ≡ dimap f id

rmap :: (b -> c) -> p a b -> p a c #

Map the second argument covariantly.

rmap ≡ dimap id

Instances

Instances details

Profunctor Measured
Instance details Defined in Diagrams.Core.Measure Methods dimap :: (a -> b) -> (c -> d) -> Measured b c -> Measured a d # lmap :: (a -> b) -> Measured b c -> Measured a c # rmap :: (b -> c) -> Measured a b -> Measured a c # (#.) :: forall a b c q. Coercible c b => q b c -> Measured a b -> Measured a c # (.#) :: forall a b c q. Coercible b a => Measured b c -> q a b -> Measured a c #
Profunctor ReifiedFold
Instance details Defined in Control.Lens.Reified Methods dimap :: (a -> b) -> (c -> d) -> ReifiedFold b c -> ReifiedFold a d # lmap :: (a -> b) -> ReifiedFold b c -> ReifiedFold a c # rmap :: (b -> c) -> ReifiedFold a b -> ReifiedFold a c # (#.) :: forall a b c q. Coercible c b => q b c -> ReifiedFold a b -> ReifiedFold a c # (.#) :: forall a b c q. Coercible b a => ReifiedFold b c -> q a b -> ReifiedFold a c #
Profunctor ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods dimap :: (a -> b) -> (c -> d) -> ReifiedGetter b c -> ReifiedGetter a d # lmap :: (a -> b) -> ReifiedGetter b c -> ReifiedGetter a c # rmap :: (b -> c) -> ReifiedGetter a b -> ReifiedGetter a c # (#.) :: forall a b c q. Coercible c b => q b c -> ReifiedGetter a b -> ReifiedGetter a c # (.#) :: forall a b c q. Coercible b a => ReifiedGetter b c -> q a b -> ReifiedGetter a c #
Monad m => Profunctor (Kleisli m)
Instance details Defined in Data.Profunctor.Unsafe Methods dimap :: (a -> b) -> (c -> d) -> Kleisli m b c -> Kleisli m a d # lmap :: (a -> b) -> Kleisli m b c -> Kleisli m a c # rmap :: (b -> c) -> Kleisli m a b -> Kleisli m a c # (#.) :: forall a b c q. Coercible c b => q b c -> Kleisli m a b -> Kleisli m a c # (.#) :: forall a b c q. Coercible b a => Kleisli m b c -> q a b -> Kleisli m a c #
Functor v => Profunctor (Query v)
Instance details Defined in Diagrams.Core.Query Methods dimap :: (a -> b) -> (c -> d) -> Query v b c -> Query v a d # lmap :: (a -> b) -> Query v b c -> Query v a c # rmap :: (b -> c) -> Query v a b -> Query v a c # (#.) :: forall a b c q. Coercible c b => q b c -> Query v a b -> Query v a c # (.#) :: forall a b c q. Coercible b a => Query v b c -> q a b -> Query v a c #
Profunctor (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Methods dimap :: (a -> b) -> (c -> d) -> Indexed i b c -> Indexed i a d # lmap :: (a -> b) -> Indexed i b c -> Indexed i a c # rmap :: (b -> c) -> Indexed i a b -> Indexed i a c # (#.) :: forall a b c q. Coercible c b => q b c -> Indexed i a b -> Indexed i a c # (.#) :: forall a b c q. Coercible b a => Indexed i b c -> q a b -> Indexed i a c #
Profunctor (ReifiedIndexedFold i)
Instance details Defined in Control.Lens.Reified Methods dimap :: (a -> b) -> (c -> d) -> ReifiedIndexedFold i b c -> ReifiedIndexedFold i a d # lmap :: (a -> b) -> ReifiedIndexedFold i b c -> ReifiedIndexedFold i a c # rmap :: (b -> c) -> ReifiedIndexedFold i a b -> ReifiedIndexedFold i a c # (#.) :: forall a b c q. Coercible c b => q b c -> ReifiedIndexedFold i a b -> ReifiedIndexedFold i a c # (.#) :: forall a b c q. Coercible b a => ReifiedIndexedFold i b c -> q a b -> ReifiedIndexedFold i a c #
Profunctor (ReifiedIndexedGetter i)
Instance details Defined in Control.Lens.Reified Methods dimap :: (a -> b) -> (c -> d) -> ReifiedIndexedGetter i b c -> ReifiedIndexedGetter i a d # lmap :: (a -> b) -> ReifiedIndexedGetter i b c -> ReifiedIndexedGetter i a c # rmap :: (b -> c) -> ReifiedIndexedGetter i a b -> ReifiedIndexedGetter i a c # (#.) :: forall a b c q. Coercible c b => q b c -> ReifiedIndexedGetter i a b -> ReifiedIndexedGetter i a c # (.#) :: forall a b c q. Coercible b a => ReifiedIndexedGetter i b c -> q a b -> ReifiedIndexedGetter i a c #
Profunctor (CopastroSum p)
Instance details Defined in Data.Profunctor.Choice Methods dimap :: (a -> b) -> (c -> d) -> CopastroSum p b c -> CopastroSum p a d # lmap :: (a -> b) -> CopastroSum p b c -> CopastroSum p a c # rmap :: (b -> c) -> CopastroSum p a b -> CopastroSum p a c # (#.) :: forall a b c q. Coercible c b => q b c -> CopastroSum p a b -> CopastroSum p a c # (.#) :: forall a b c q. Coercible b a => CopastroSum p b c -> q a b -> CopastroSum p a c #
Profunctor (CotambaraSum p)
Instance details Defined in Data.Profunctor.Choice Methods dimap :: (a -> b) -> (c -> d) -> CotambaraSum p b c -> CotambaraSum p a d # lmap :: (a -> b) -> CotambaraSum p b c -> CotambaraSum p a c # rmap :: (b -> c) -> CotambaraSum p a b -> CotambaraSum p a c # (#.) :: forall a b c q. Coercible c b => q b c -> CotambaraSum p a b -> CotambaraSum p a c # (.#) :: forall a b c q. Coercible b a => CotambaraSum p b c -> q a b -> CotambaraSum p a c #
Profunctor (PastroSum p)
Instance details Defined in Data.Profunctor.Choice Methods dimap :: (a -> b) -> (c -> d) -> PastroSum p b c -> PastroSum p a d # lmap :: (a -> b) -> PastroSum p b c -> PastroSum p a c # rmap :: (b -> c) -> PastroSum p a b -> PastroSum p a c # (#.) :: forall a b c q. Coercible c b => q b c -> PastroSum p a b -> PastroSum p a c # (.#) :: forall a b c q. Coercible b a => PastroSum p b c -> q a b -> PastroSum p a c #
Profunctor p => Profunctor (TambaraSum p)
Instance details Defined in Data.Profunctor.Choice Methods dimap :: (a -> b) -> (c -> d) -> TambaraSum p b c -> TambaraSum p a d # lmap :: (a -> b) -> TambaraSum p b c -> TambaraSum p a c # rmap :: (b -> c) -> TambaraSum p a b -> TambaraSum p a c # (#.) :: forall a b c q. Coercible c b => q b c -> TambaraSum p a b -> TambaraSum p a c # (.#) :: forall a b c q. Coercible b a => TambaraSum p b c -> q a b -> TambaraSum p a c #
Profunctor p => Profunctor (Closure p)
Instance details Defined in Data.Profunctor.Closed Methods dimap :: (a -> b) -> (c -> d) -> Closure p b c -> Closure p a d # lmap :: (a -> b) -> Closure p b c -> Closure p a c # rmap :: (b -> c) -> Closure p a b -> Closure p a c # (#.) :: forall a b c q. Coercible c b => q b c -> Closure p a b -> Closure p a c # (.#) :: forall a b c q. Coercible b a => Closure p b c -> q a b -> Closure p a c #
Profunctor (Environment p)
Instance details Defined in Data.Profunctor.Closed Methods dimap :: (a -> b) -> (c -> d) -> Environment p b c -> Environment p a d # lmap :: (a -> b) -> Environment p b c -> Environment p a c # rmap :: (b -> c) -> Environment p a b -> Environment p a c # (#.) :: forall a b c q. Coercible c b => q b c -> Environment p a b -> Environment p a c # (.#) :: forall a b c q. Coercible b a => Environment p b c -> q a b -> Environment p a c #
Profunctor (Copastro p)
Instance details Defined in Data.Profunctor.Strong Methods dimap :: (a -> b) -> (c -> d) -> Copastro p b c -> Copastro p a d # lmap :: (a -> b) -> Copastro p b c -> Copastro p a c # rmap :: (b -> c) -> Copastro p a b -> Copastro p a c # (#.) :: forall a b c q. Coercible c b => q b c -> Copastro p a b -> Copastro p a c # (.#) :: forall a b c q. Coercible b a => Copastro p b c -> q a b -> Copastro p a c #
Profunctor (Cotambara p)
Instance details Defined in Data.Profunctor.Strong Methods dimap :: (a -> b) -> (c -> d) -> Cotambara p b c -> Cotambara p a d # lmap :: (a -> b) -> Cotambara p b c -> Cotambara p a c # rmap :: (b -> c) -> Cotambara p a b -> Cotambara p a c # (#.) :: forall a b c q. Coercible c b => q b c -> Cotambara p a b -> Cotambara p a c # (.#) :: forall a b c q. Coercible b a => Cotambara p b c -> q a b -> Cotambara p a c #
Profunctor (Pastro p)
Instance details Defined in Data.Profunctor.Strong Methods dimap :: (a -> b) -> (c -> d) -> Pastro p b c -> Pastro p a d # lmap :: (a -> b) -> Pastro p b c -> Pastro p a c # rmap :: (b -> c) -> Pastro p a b -> Pastro p a c # (#.) :: forall a b c q. Coercible c b => q b c -> Pastro p a b -> Pastro p a c # (.#) :: forall a b c q. Coercible b a => Pastro p b c -> q a b -> Pastro p a c #
Profunctor p => Profunctor (Tambara p)
Instance details Defined in Data.Profunctor.Strong Methods dimap :: (a -> b) -> (c -> d) -> Tambara p b c -> Tambara p a d # lmap :: (a -> b) -> Tambara p b c -> Tambara p a c # rmap :: (b -> c) -> Tambara p a b -> Tambara p a c # (#.) :: forall a b c q. Coercible c b => q b c -> Tambara p a b -> Tambara p a c # (.#) :: forall a b c q. Coercible b a => Tambara p b c -> q a b -> Tambara p a c #
Profunctor (Tagged :: Type -> Type -> Type)
Instance details Defined in Data.Profunctor.Unsafe Methods dimap :: (a -> b) -> (c -> d) -> Tagged b c -> Tagged a d # lmap :: (a -> b) -> Tagged b c -> Tagged a c # rmap :: (b -> c) -> Tagged a b -> Tagged a c # (#.) :: forall a b c q. Coercible c b => q b c -> Tagged a b -> Tagged a c # (.#) :: forall a b c q. Coercible b a => Tagged b c -> q a b -> Tagged a c #
Functor w => Profunctor (Cokleisli w)
Instance details Defined in Data.Profunctor.Unsafe Methods dimap :: (a -> b) -> (c -> d) -> Cokleisli w b c -> Cokleisli w a d # lmap :: (a -> b) -> Cokleisli w b c -> Cokleisli w a c # rmap :: (b -> c) -> Cokleisli w a b -> Cokleisli w a c # (#.) :: forall a b c q. Coercible c b => q b c -> Cokleisli w a b -> Cokleisli w a c # (.#) :: forall a b c q. Coercible b a => Cokleisli w b c -> q a b -> Cokleisli w a c #
Profunctor (Exchange a b)
Instance details Defined in Control.Lens.Internal.Iso Methods dimap :: (a0 -> b0) -> (c -> d) -> Exchange a b b0 c -> Exchange a b a0 d # lmap :: (a0 -> b0) -> Exchange a b b0 c -> Exchange a b a0 c # rmap :: (b0 -> c) -> Exchange a b a0 b0 -> Exchange a b a0 c # (#.) :: forall a0 b0 c q. Coercible c b0 => q b0 c -> Exchange a b a0 b0 -> Exchange a b a0 c # (.#) :: forall a0 b0 c q. Coercible b0 a0 => Exchange a b b0 c -> q a0 b0 -> Exchange a b a0 c #
Profunctor (Market a b)
Instance details Defined in Control.Lens.Internal.Prism Methods dimap :: (a0 -> b0) -> (c -> d) -> Market a b b0 c -> Market a b a0 d # lmap :: (a0 -> b0) -> Market a b b0 c -> Market a b a0 c # rmap :: (b0 -> c) -> Market a b a0 b0 -> Market a b a0 c # (#.) :: forall a0 b0 c q. Coercible c b0 => q b0 c -> Market a b a0 b0 -> Market a b a0 c # (.#) :: forall a0 b0 c q. Coercible b0 a0 => Market a b b0 c -> q a0 b0 -> Market a b a0 c #
Functor f => Profunctor (Costar f)
Instance details Defined in Data.Profunctor.Types Methods dimap :: (a -> b) -> (c -> d) -> Costar f b c -> Costar f a d # lmap :: (a -> b) -> Costar f b c -> Costar f a c # rmap :: (b -> c) -> Costar f a b -> Costar f a c # (#.) :: forall a b c q. Coercible c b => q b c -> Costar f a b -> Costar f a c # (.#) :: forall a b c q. Coercible b a => Costar f b c -> q a b -> Costar f a c #
Profunctor (Forget r :: Type -> Type -> TYPE LiftedRep)
Instance details Defined in Data.Profunctor.Types Methods dimap :: (a -> b) -> (c -> d) -> Forget r b c -> Forget r a d # lmap :: (a -> b) -> Forget r b c -> Forget r a c # rmap :: (b -> c) -> Forget r a b -> Forget r a c # (#.) :: forall a b c q. Coercible c b => q b c -> Forget r a b -> Forget r a c # (.#) :: forall a b c q. Coercible b a => Forget r b c -> q a b -> Forget r a c #
Functor f => Profunctor (Star f)
Instance details Defined in Data.Profunctor.Types Methods dimap :: (a -> b) -> (c -> d) -> Star f b c -> Star f a d # lmap :: (a -> b) -> Star f b c -> Star f a c # rmap :: (b -> c) -> Star f a b -> Star f a c # (#.) :: forall a b c q. Coercible c b => q b c -> Star f a b -> Star f a c # (.#) :: forall a b c q. Coercible b a => Star f b c -> q a b -> Star f a c #
Profunctor (->)
Instance details Defined in Data.Profunctor.Unsafe Methods dimap :: (a -> b) -> (c -> d) -> (b -> c) -> a -> d # lmap :: (a -> b) -> (b -> c) -> a -> c # rmap :: (b -> c) -> (a -> b) -> a -> c # (#.) :: forall a b c q. Coercible c b => q b c -> (a -> b) -> a -> c # (.#) :: forall a b c q. Coercible b a => (b -> c) -> q a b -> a -> c #
Contravariant f => Profunctor (Clown f :: Type -> Type -> Type)
Instance details Defined in Data.Profunctor.Unsafe Methods dimap :: (a -> b) -> (c -> d) -> Clown f b c -> Clown f a d # lmap :: (a -> b) -> Clown f b c -> Clown f a c # rmap :: (b -> c) -> Clown f a b -> Clown f a c # (#.) :: forall a b c q. Coercible c b => q b c -> Clown f a b -> Clown f a c # (.#) :: forall a b c q. Coercible b a => Clown f b c -> q a b -> Clown f a c #
Functor f => Profunctor (Joker f :: Type -> Type -> Type)
Instance details Defined in Data.Profunctor.Unsafe Methods dimap :: (a -> b) -> (c -> d) -> Joker f b c -> Joker f a d # lmap :: (a -> b) -> Joker f b c -> Joker f a c # rmap :: (b -> c) -> Joker f a b -> Joker f a c # (#.) :: forall a b c q. Coercible c b => q b c -> Joker f a b -> Joker f a c # (.#) :: forall a b c q. Coercible b a => Joker f b c -> q a b -> Joker f a c #
Arrow p => Profunctor (WrappedArrow p)
Instance details Defined in Data.Profunctor.Types Methods dimap :: (a -> b) -> (c -> d) -> WrappedArrow p b c -> WrappedArrow p a d # lmap :: (a -> b) -> WrappedArrow p b c -> WrappedArrow p a c # rmap :: (b -> c) -> WrappedArrow p a b -> WrappedArrow p a c # (#.) :: forall a b c q. Coercible c b => q b c -> WrappedArrow p a b -> WrappedArrow p a c # (.#) :: forall a b c q. Coercible b a => WrappedArrow p b c -> q a b -> WrappedArrow p a c #
(Profunctor p, Profunctor q) => Profunctor (Product p q)
Instance details Defined in Data.Profunctor.Unsafe Methods dimap :: (a -> b) -> (c -> d) -> Product p q b c -> Product p q a d # lmap :: (a -> b) -> Product p q b c -> Product p q a c # rmap :: (b -> c) -> Product p q a b -> Product p q a c # (#.) :: forall a b c q0. Coercible c b => q0 b c -> Product p q a b -> Product p q a c # (.#) :: forall a b c q0. Coercible b a => Product p q b c -> q0 a b -> Product p q a c #
(Profunctor p, Profunctor q) => Profunctor (Sum p q)
Instance details Defined in Data.Profunctor.Unsafe Methods dimap :: (a -> b) -> (c -> d) -> Sum p q b c -> Sum p q a d # lmap :: (a -> b) -> Sum p q b c -> Sum p q a c # rmap :: (b -> c) -> Sum p q a b -> Sum p q a c # (#.) :: forall a b c q0. Coercible c b => q0 b c -> Sum p q a b -> Sum p q a c # (.#) :: forall a b c q0. Coercible b a => Sum p q b c -> q0 a b -> Sum p q a c #
(Functor f, Profunctor p) => Profunctor (Tannen f p)
Instance details Defined in Data.Profunctor.Unsafe Methods dimap :: (a -> b) -> (c -> d) -> Tannen f p b c -> Tannen f p a d # lmap :: (a -> b) -> Tannen f p b c -> Tannen f p a c # rmap :: (b -> c) -> Tannen f p a b -> Tannen f p a c # (#.) :: forall a b c q. Coercible c b => q b c -> Tannen f p a b -> Tannen f p a c # (.#) :: forall a b c q. Coercible b a => Tannen f p b c -> q a b -> Tannen f p a c #
(Functor f, Profunctor p) => Profunctor (Cayley f p)
Instance details Defined in Data.Profunctor.Cayley Methods dimap :: (a -> b) -> (c -> d) -> Cayley f p b c -> Cayley f p a d # lmap :: (a -> b) -> Cayley f p b c -> Cayley f p a c # rmap :: (b -> c) -> Cayley f p a b -> Cayley f p a c # (#.) :: forall a b c q. Coercible c b => q b c -> Cayley f p a b -> Cayley f p a c # (.#) :: forall a b c q. Coercible b a => Cayley f p b c -> q a b -> Cayley f p a c #
(Profunctor p, Profunctor q) => Profunctor (Procompose p q)
Instance details Defined in Data.Profunctor.Composition Methods dimap :: (a -> b) -> (c -> d) -> Procompose p q b c -> Procompose p q a d # lmap :: (a -> b) -> Procompose p q b c -> Procompose p q a c # rmap :: (b -> c) -> Procompose p q a b -> Procompose p q a c # (#.) :: forall a b c q0. Coercible c b => q0 b c -> Procompose p q a b -> Procompose p q a c # (.#) :: forall a b c q0. Coercible b a => Procompose p q b c -> q0 a b -> Procompose p q a c #
(Profunctor p, Profunctor q) => Profunctor (Rift p q)
Instance details Defined in Data.Profunctor.Composition Methods dimap :: (a -> b) -> (c -> d) -> Rift p q b c -> Rift p q a d # lmap :: (a -> b) -> Rift p q b c -> Rift p q a c # rmap :: (b -> c) -> Rift p q a b -> Rift p q a c # (#.) :: forall a b c q0. Coercible c b => q0 b c -> Rift p q a b -> Rift p q a c # (.#) :: forall a b c q0. Coercible b a => Rift p q b c -> q0 a b -> Rift p q a c #
(Profunctor p, Functor f, Functor g) => Profunctor (Biff p f g)
Instance details Defined in Data.Profunctor.Unsafe Methods dimap :: (a -> b) -> (c -> d) -> Biff p f g b c -> Biff p f g a d # lmap :: (a -> b) -> Biff p f g b c -> Biff p f g a c # rmap :: (b -> c) -> Biff p f g a b -> Biff p f g a c # (#.) :: forall a b c q. Coercible c b => q b c -> Biff p f g a b -> Biff p f g a c # (.#) :: forall a b c q. Coercible b a => Biff p f g b c -> q a b -> Biff p f g a c #

defaultFieldRules :: LensRules #

makeFieldsNoPrefix :: Name -> DecsQ #

Generate overloaded field accessors based on field names which are only prefixed with an underscore (e.g. _name), not additionally with the type name (e.g. _fooName).

This might be the desired behaviour in case the DuplicateRecordFields language extension is used in order to get rid of the necessity to prefix each field name with the type name.

As an example:

data Foo a  = Foo { _x :: Int, _y :: a }
newtype Bar = Bar { _x :: Char }
makeFieldsNoPrefix ''Foo
makeFieldsNoPrefix ''Bar

will create classes

class HasX s a | s -> a where
  x :: Lens' s a
class HasY s a | s -> a where
  y :: Lens' s a

together with instances

instance HasX (Foo a) Int
instance HasY (Foo a) a where
instance HasX Bar Char where

For details, see classUnderscoreNoPrefixFields.

makeFieldsNoPrefix = makeLensesWith classUnderscoreNoPrefixFields

makeFields :: Name -> DecsQ #

Generate overloaded field accessors.

e.g

data Foo a = Foo { _fooX :: Int, _fooY :: a }
newtype Bar = Bar { _barX :: Char }
makeFields ''Foo
makeFields ''Bar

will create

_fooXLens :: Lens' (Foo a) Int
_fooYLens :: Lens (Foo a) (Foo b) a b
class HasX s a | s -> a where
  x :: Lens' s a
instance HasX (Foo a) Int where
  x = _fooXLens
class HasY s a | s -> a where
  y :: Lens' s a
instance HasY (Foo a) a where
  y = _fooYLens
_barXLens :: Iso' Bar Char
instance HasX Bar Char where
  x = _barXLens

For details, see camelCaseFields.

makeFields = makeLensesWith defaultFieldRules

abbreviatedNamer :: FieldNamer #

A FieldNamer for abbreviatedFields.

abbreviatedFields :: LensRules #

Field rules fields in the form prefixFieldname or _prefixFieldname If you want all fields to be lensed, then there is no reason to use an _ before the prefix. If any of the record fields leads with an _ then it is assume a field without an _ should not have a lens created.

Note that prefix may be any string of characters that are not uppercase letters. (In particular, it may be arbitrary string of lowercase letters and numbers) This is the behavior that defaultFieldRules had in lens 4.4 and earlier.

classUnderscoreNoPrefixNamer :: FieldNamer #

A FieldNamer for classUnderscoreNoPrefixFields.

classUnderscoreNoPrefixFields :: LensRules #

Field rules for fields in the form _fieldname (the leading underscore is mandatory).

Note: The primary difference to camelCaseFields is that for classUnderscoreNoPrefixFields the field names are not expected to be prefixed with the type name. This might be the desired behaviour when the DuplicateRecordFields extension is enabled.

camelCaseNamer :: FieldNamer #

A FieldNamer for camelCaseFields.

camelCaseFields :: LensRules #

Field rules for fields in the form prefixFieldname or _prefixFieldname If you want all fields to be lensed, then there is no reason to use an _ before the prefix. If any of the record fields leads with an _ then it is assume a field without an _ should not have a lens created.

Note: The prefix must be the same as the typename (with the first letter lowercased). This is a change from lens versions before lens 4.5. If you want the old behaviour, use makeLensesWith abbreviatedFields

underscoreNamer :: FieldNamer #

A FieldNamer for underscoreFields.

underscoreFields :: LensRules #

Field rules for fields in the form _prefix_fieldname

makeWrapped :: Name -> DecsQ #

Build Wrapped instance for a given newtype

declareLensesWith :: LensRules -> DecsQ -> DecsQ #

Declare lenses for each records in the given declarations, using the specified LensRules. Any record syntax in the input will be stripped off.

declareFields :: DecsQ -> DecsQ #

 declareFields = declareLensesWith defaultFieldRules

declareWrapped :: DecsQ -> DecsQ #

Build Wrapped instance for each newtype.

declarePrisms :: DecsQ -> DecsQ #

Generate a Prism for each constructor of each data type.

e.g.

declarePrisms [d|
  data Exp = Lit Int | Var String | Lambda{ bound::String, body::Exp }
  |]

will create

data Exp = Lit Int | Var String | Lambda { bound::String, body::Exp }
_Lit :: Prism' Exp Int
_Var :: Prism' Exp String
_Lambda :: Prism' Exp (String, Exp)

declareClassyFor :: [(String, (String, String))] -> [(String, String)] -> DecsQ -> DecsQ #

Similar to makeClassyFor, but takes a declaration quote.

declareClassy :: DecsQ -> DecsQ #

For each record in the declaration quote, make lenses and traversals for it, and create a class when the type has no arguments. All record syntax in the input will be stripped off.

e.g.

declareClassy [d|
  data Foo = Foo { fooX, fooY :: Int }
    deriving Show
  |]

will create

data Foo = Foo Int Int deriving Show
class HasFoo t where
  foo :: Lens' t Foo
instance HasFoo Foo where foo = id
fooX, fooY :: HasFoo t => Lens' t Int

declareLensesFor :: [(String, String)] -> DecsQ -> DecsQ #

Similar to makeLensesFor, but takes a declaration quote.

declareLenses :: DecsQ -> DecsQ #

Make lenses for all records in the given declaration quote. All record syntax in the input will be stripped off.

e.g.

declareLenses [d|
  data Foo = Foo { fooX, fooY :: Int }
    deriving Show
  |]

will create

data Foo = Foo Int Int deriving Show
fooX, fooY :: Lens' Foo Int

makeLensesWith :: LensRules -> Name -> DecsQ #

Build lenses with a custom configuration.

makeClassyFor :: String -> String -> [(String, String)] -> Name -> DecsQ #

Derive lenses and traversals, using a named wrapper class, and specifying explicit pairings of (fieldName, traversalName).

Example usage:

makeClassyFor "HasFoo" "foo" [("_foo", "fooLens"), ("bar", "lbar")] ''Foo

makeLensesFor :: [(String, String)] -> Name -> DecsQ #

Derive lenses and traversals, specifying explicit pairings of (fieldName, lensName).

If you map multiple names to the same label, and it is present in the same constructor then this will generate a Traversal.

e.g.

makeLensesFor [("_foo", "fooLens"), ("baz", "lbaz")] ''Foo
makeLensesFor [("_barX", "bar"), ("_barY", "bar")] ''Bar

makeClassy_ :: Name -> DecsQ #

Make lenses and traversals for a type, and create a class when the type has no arguments. Works the same as makeClassy except that (a) it expects that record field names do not begin with an underscore, (b) all record fields are made into lenses, and (c) the resulting lens is prefixed with an underscore.

makeClassy :: Name -> DecsQ #

Make lenses and traversals for a type, and create a class when the type has no arguments.

e.g.

data Foo = Foo { _fooX, _fooY :: Int }
makeClassy ''Foo

will create

class HasFoo t where
  foo :: Lens' t Foo
  fooX :: Lens' t Int
  fooX = foo . go where go f (Foo x y) = (\x' -> Foo x' y) <$> f x
  fooY :: Lens' t Int
  fooY = foo . go where go f (Foo x y) = (\y' -> Foo x y') <$> f y
instance HasFoo Foo where
  foo = id

makeClassy = makeLensesWith classyRules

makeLenses :: Name -> DecsQ #

Build lenses (and traversals) with a sensible default configuration.

e.g.

data FooBar
  = Foo { _x, _y :: Int }
  | Bar { _x :: Int }
makeLenses ''FooBar

will create

x :: Lens' FooBar Int
x f (Foo a b) = (\a' -> Foo a' b) <$> f a
x f (Bar a)   = Bar <$> f a
y :: Traversal' FooBar Int
y f (Foo a b) = (\b' -> Foo a  b') <$> f b
y _ c@(Bar _) = pure c

makeLenses = makeLensesWith lensRules

classyRules_ :: LensRules #

A LensRules used by makeClassy_.

classyRules :: LensRules #

Rules for making lenses and traversals that precompose another Lens.

mappingNamer #

Arguments

:: (String -> [String])	A function that maps a `fieldName` to `lensName`s.
-> FieldNamer

Create a FieldNamer from a mapping function. If the function returns [], it creates no lens for the field.

lookingupNamer :: [(String, String)] -> FieldNamer #

Create a FieldNamer from explicit pairings of (fieldName, lensName).

lensRulesFor #

Arguments

:: [(String, String)]	(Field Name, Definition Name)
-> LensRules

Construct a LensRules value for generating top-level definitions using the given map from field names to definition names.

underscoreNoPrefixNamer :: FieldNamer #

A FieldNamer that strips the _ off of the field name, lowercases the name, and skips the field if it doesn't start with an '_'.

lensRules :: LensRules #

Rules for making fairly simple partial lenses, ignoring the special cases for isomorphisms and traversals, and not making any classes. It uses underscoreNoPrefixNamer.

lensClass :: Lens' LensRules ClassyNamer #

Lens' to access the option for naming "classy" lenses.

lensField :: Lens' LensRules FieldNamer #

Lens' to access the convention for naming fields in our LensRules.

createClass :: Lens' LensRules Bool #

Create the class if the constructor is Simple and the lensClass rule matches.

generateLazyPatterns :: Lens' LensRules Bool #

Generate optics using lazy pattern matches. This can allow fields of an undefined value to be initialized with lenses:

data Foo = Foo {_x :: Int, _y :: Bool}
  deriving Show

makeLensesWith (lensRules & generateLazyPatterns .~ True) ''Foo

> undefined & x .~ 8 & y .~ True
Foo {_x = 8, _y = True}

The downside of this flag is that it can lead to space-leaks and code-size/compile-time increases when generated for large records. By default this flag is turned off, and strict optics are generated.

When using lazy optics the strict optic can be recovered by composing with $!:

strictOptic = ($!) . lazyOptic

generateUpdateableOptics :: Lens' LensRules Bool #

Generate "updateable" optics when True. When False, Folds will be generated instead of Traversals and Getters will be generated instead of Lenses. This mode is intended to be used for types with invariants which must be maintained by "smart" constructors.

generateSignatures :: Lens' LensRules Bool #

Indicate whether or not to supply the signatures for the generated lenses.

Disabling this can be useful if you want to provide a more restricted type signature or if you want to supply hand-written haddocks.

simpleLenses :: Lens' LensRules Bool #

Generate "simple" optics even when type-changing optics are possible. (e.g. Lens' instead of Lens)

data LensRules #

Rules to construct lenses for data fields.

type FieldNamer #

Arguments

= Name	Name of the data type that lenses are being generated for.
-> [Name]	Names of all fields (including the field being named) in the data type.
-> Name	Name of the field being named.
-> [DefName]	Name(s) of the lens functions. If empty, no lens is created for that field.

The rule to create function names of lenses for data fields.

Although it's sometimes useful, you won't need the first two arguments most of the time.

data DefName #

Name to give to generated field optics.

Constructors

TopName Name	Simple top-level definition name
MethodName Name Name	makeFields-style class name and method name

Instances

Instances details

Show DefName
Instance details Defined in Control.Lens.Internal.FieldTH Methods showsPrec :: Int -> DefName -> ShowS # show :: DefName -> String # showList :: [DefName] -> ShowS #
Eq DefName
Instance details Defined in Control.Lens.Internal.FieldTH Methods (==) :: DefName -> DefName -> Bool # (/=) :: DefName -> DefName -> Bool #
Ord DefName
Instance details Defined in Control.Lens.Internal.FieldTH Methods compare :: DefName -> DefName -> Ordering # (<) :: DefName -> DefName -> Bool # (<=) :: DefName -> DefName -> Bool # (>) :: DefName -> DefName -> Bool # (>=) :: DefName -> DefName -> Bool # max :: DefName -> DefName -> DefName # min :: DefName -> DefName -> DefName #

type ClassyNamer #

Arguments

= Name	Name of the data type that lenses are being generated for.
-> Maybe (Name, Name)	Names of the class and the main method it generates, respectively.

The optional rule to create a class and method around a monomorphic data type. If this naming convention is provided, it generates a "classy" lens.

makeClassyPrisms #

Arguments

:: Name	Type constructor name
-> DecsQ

Generate a Prism for each constructor of a data type and combine them into a single class. No Isos are created. Reviews are created for constructors with existentially quantified constructors and GADTs.

e.g.

data FooBarBaz a
  = Foo Int
  | Bar a
  | Baz Int Char
makeClassyPrisms ''FooBarBaz

will create

class AsFooBarBaz s a | s -> a where
  _FooBarBaz :: Prism' s (FooBarBaz a)
  _Foo :: Prism' s Int
  _Bar :: Prism' s a
  _Baz :: Prism' s (Int,Char)

  _Foo = _FooBarBaz . _Foo
  _Bar = _FooBarBaz . _Bar
  _Baz = _FooBarBaz . _Baz

instance AsFooBarBaz (FooBarBaz a) a

Generate an As class of prisms. Names are selected by prefixing the constructor name with an underscore. Constructors with multiple fields will construct Prisms to tuples of those fields.

In the event that the name of a data type is also the name of one of its constructors, the name of the Prism generated for the data type will be prefixed with an extra _ (if the data type name is prefix) or . (if the name is infix) to disambiguate it from the Prism for the corresponding constructor. For example, this code:

data Quux = Quux Int | Fred Bool
makeClassyPrisms ''Quux

will create:

class AsQuux s where
  __Quux :: Prism' s Quux -- Data type prism
  _Quux :: Prism' s Int   -- Constructor prism
  _Fred :: Prism' s Bool

  _Quux = __Quux . _Quux
  _Fred = __Quux . _Fred

instance AsQuux Quux

makePrisms #

Arguments

:: Name	Type constructor name
-> DecsQ

Generate a Prism for each constructor of a data type. Isos generated when possible. Reviews are created for constructors with existentially quantified constructors and GADTs.

e.g.

data FooBarBaz a
  = Foo Int
  | Bar a
  | Baz Int Char
makePrisms ''FooBarBaz

will create

_Foo :: Prism' (FooBarBaz a) Int
_Bar :: Prism (FooBarBaz a) (FooBarBaz b) a b
_Baz :: Prism' (FooBarBaz a) (Int, Char)

iat :: At m => Index m -> IndexedLens' (Index m) m (Maybe (IxValue m)) #

An indexed version of at.

>>> Map.fromList [(1,"world")] ^@. iat 1
(1,Just "world")

>>> iat 1 %@~ (\i x -> if odd i then Just "hello" else Nothing) $ Map.empty
fromList [(1,"hello")]

>>> iat 2 %@~ (\i x -> if odd i then Just "hello" else Nothing) $ Map.empty
fromList []

sans :: At m => Index m -> m -> m #

Delete the value associated with a key in a Map-like container

sans k = at k .~ Nothing

ixAt :: At m => Index m -> Traversal' m (IxValue m) #

A definition of ix for types with an At instance. This is the default if you don't specify a definition for ix.

iix :: Ixed m => Index m -> IndexedTraversal' (Index m) m (IxValue m) #

An indexed version of ix.

>>> Seq.fromList [a,b,c,d] & iix 2 %@~ f'
fromList [a,b,f' 2 c,d]

>>> Seq.fromList [a,b,c,d] & iix 2 .@~ h
fromList [a,b,h 2,d]

>>> Seq.fromList [a,b,c,d] ^@? iix 2
Just (2,c)

>>> Seq.fromList [] ^@? iix 2
Nothing

icontains :: Contains m => Index m -> IndexedLens' (Index m) m Bool #

An indexed version of contains.

>>> IntSet.fromList [1,2,3,4] ^@. icontains 3
(3,True)

>>> IntSet.fromList [1,2,3,4] ^@. icontains 5
(5,False)

>>> IntSet.fromList [1,2,3,4] & icontains 3 %@~ \i x -> if odd i then not x else x
fromList [1,2,4]

>>> IntSet.fromList [1,2,3,4] & icontains 3 %@~ \i x -> if even i then not x else x
fromList [1,2,3,4]

type family Index s #

Instances

Instances details

type Index ByteString
Instance details Defined in Control.Lens.At type Index ByteString = Int
type Index ByteString
Instance details Defined in Control.Lens.At type Index ByteString = Int64
type Index IntSet
Instance details Defined in Control.Lens.At type Index IntSet = Int
type Index Text
Instance details Defined in Control.Lens.At type Index Text = Int
type Index Text
Instance details Defined in Control.Lens.At type Index Text = Int64
type Index (Complex a)
Instance details Defined in Control.Lens.At type Index (Complex a) = Int
type Index (Identity a)
Instance details Defined in Control.Lens.At type Index (Identity a) = ()
type Index (IntMap a)
Instance details Defined in Control.Lens.At type Index (IntMap a) = Int
type Index (Seq a)
Instance details Defined in Control.Lens.At type Index (Seq a) = Int
type Index (Set a)
Instance details Defined in Control.Lens.At type Index (Set a) = a
type Index (Tree a)
Instance details Defined in Control.Lens.At type Index (Tree a) = [Int]
type Index (Plucker a)
Instance details Defined in Linear.Plucker type Index (Plucker a) = E Plucker
type Index (Quaternion a)
Instance details Defined in Linear.Quaternion type Index (Quaternion a) = E Quaternion
type Index (V0 a)
Instance details Defined in Linear.V0 type Index (V0 a) = E V0
type Index (V1 a)
Instance details Defined in Linear.V1 type Index (V1 a) = E V1
type Index (V2 a)
Instance details Defined in Linear.V2 type Index (V2 a) = E V2
type Index (V3 a)
Instance details Defined in Linear.V3 type Index (V3 a) = E V3
type Index (V4 a)
Instance details Defined in Linear.V4 type Index (V4 a) = E V4
type Index (HashSet a)
Instance details Defined in Control.Lens.At type Index (HashSet a) = a
type Index (Vector a)
Instance details Defined in Control.Lens.At type Index (Vector a) = Int
type Index (Vector a)
Instance details Defined in Control.Lens.At type Index (Vector a) = Int
type Index (Vector a)
Instance details Defined in Control.Lens.At type Index (Vector a) = Int
type Index (Vector a)
Instance details Defined in Control.Lens.At type Index (Vector a) = Int
type Index (NonEmpty a)
Instance details Defined in Control.Lens.At type Index (NonEmpty a) = Int
type Index (Maybe a)
Instance details Defined in Control.Lens.At type Index (Maybe a) = ()
type Index [a]
Instance details Defined in Control.Lens.At type Index [a] = Int
type Index (UArray i e)
Instance details Defined in Control.Lens.At type Index (UArray i e) = i
type Index (Array i e)
Instance details Defined in Control.Lens.At type Index (Array i e) = i
type Index (Map k a)
Instance details Defined in Control.Lens.At type Index (Map k a) = k
type Index (Style v n)
Instance details Defined in Diagrams.Core.Style type Index (Style v n) = TypeRep
type Index (Point f a)
Instance details Defined in Linear.Affine type Index (Point f a) = Index (f a)
type Index (HashMap k a)
Instance details Defined in Control.Lens.At type Index (HashMap k a) = k
type Index (e -> a)
Instance details Defined in Control.Lens.At type Index (e -> a) = e
type Index (a, b)
Instance details Defined in Control.Lens.At type Index (a, b) = Int
type Index (V n a)
Instance details Defined in Linear.V type Index (V n a) = Int
type Index (a, b, c)
Instance details Defined in Control.Lens.At type Index (a, b, c) = Int
type Index (a, b, c, d)
Instance details Defined in Control.Lens.At type Index (a, b, c, d) = Int
type Index (a, b, c, d, e)
Instance details Defined in Control.Lens.At type Index (a, b, c, d, e) = Int
type Index (a, b, c, d, e, f)
Instance details Defined in Control.Lens.At type Index (a, b, c, d, e, f) = Int
type Index (a, b, c, d, e, f, g)
Instance details Defined in Control.Lens.At type Index (a, b, c, d, e, f, g) = Int
type Index (a, b, c, d, e, f, g, h)
Instance details Defined in Control.Lens.At type Index (a, b, c, d, e, f, g, h) = Int
type Index (a, b, c, d, e, f, g, h, i)
Instance details Defined in Control.Lens.At type Index (a, b, c, d, e, f, g, h, i) = Int

class Contains m #

This class provides a simple Lens that lets you view (and modify) information about whether or not a container contains a given Index.

Minimal complete definition

contains

Instances

Instances details

Contains IntSet
Instance details Defined in Control.Lens.At Methods contains :: Index IntSet -> Lens' IntSet Bool #
Ord a => Contains (Set a)
Instance details Defined in Control.Lens.At Methods contains :: Index (Set a) -> Lens' (Set a) Bool #
(Eq a, Hashable a) => Contains (HashSet a)
Instance details Defined in Control.Lens.At Methods contains :: Index (HashSet a) -> Lens' (HashSet a) Bool #

type family IxValue m #

This provides a common notion of a value at an index that is shared by both Ixed and At.

Instances

Instances details

type IxValue ByteString
Instance details Defined in Control.Lens.At type IxValue ByteString = Word8
type IxValue ByteString
Instance details Defined in Control.Lens.At type IxValue ByteString = Word8
type IxValue IntSet
Instance details Defined in Control.Lens.At type IxValue IntSet = ()
type IxValue Text
Instance details Defined in Control.Lens.At type IxValue Text = Char
type IxValue Text
Instance details Defined in Control.Lens.At type IxValue Text = Char
type IxValue (Identity a)
Instance details Defined in Control.Lens.At type IxValue (Identity a) = a
type IxValue (IntMap a)
Instance details Defined in Control.Lens.At type IxValue (IntMap a) = a
type IxValue (Seq a)
Instance details Defined in Control.Lens.At type IxValue (Seq a) = a
type IxValue (Set k)
Instance details Defined in Control.Lens.At type IxValue (Set k) = ()
type IxValue (Tree a)
Instance details Defined in Control.Lens.At type IxValue (Tree a) = a
type IxValue (Plucker a)
Instance details Defined in Linear.Plucker type IxValue (Plucker a) = a
type IxValue (Quaternion a)
Instance details Defined in Linear.Quaternion type IxValue (Quaternion a) = a
type IxValue (V0 a)
Instance details Defined in Linear.V0 type IxValue (V0 a) = a
type IxValue (V1 a)
Instance details Defined in Linear.V1 type IxValue (V1 a) = a
type IxValue (V2 a)
Instance details Defined in Linear.V2 type IxValue (V2 a) = a
type IxValue (V3 a)
Instance details Defined in Linear.V3 type IxValue (V3 a) = a
type IxValue (V4 a)
Instance details Defined in Linear.V4 type IxValue (V4 a) = a
type IxValue (HashSet k)
Instance details Defined in Control.Lens.At type IxValue (HashSet k) = ()
type IxValue (Vector a)
Instance details Defined in Control.Lens.At type IxValue (Vector a) = a
type IxValue (Vector a)
Instance details Defined in Control.Lens.At type IxValue (Vector a) = a
type IxValue (Vector a)
Instance details Defined in Control.Lens.At type IxValue (Vector a) = a
type IxValue (Vector a)
Instance details Defined in Control.Lens.At type IxValue (Vector a) = a
type IxValue (NonEmpty a)
Instance details Defined in Control.Lens.At type IxValue (NonEmpty a) = a
type IxValue (Maybe a)
Instance details Defined in Control.Lens.At type IxValue (Maybe a) = a
type IxValue [a]
Instance details Defined in Control.Lens.At type IxValue [a] = a
type IxValue (UArray i e)
Instance details Defined in Control.Lens.At type IxValue (UArray i e) = e
type IxValue (Array i e)
Instance details Defined in Control.Lens.At type IxValue (Array i e) = e
type IxValue (Map k a)
Instance details Defined in Control.Lens.At type IxValue (Map k a) = a
type IxValue (Style v n)
Instance details Defined in Diagrams.Core.Style type IxValue (Style v n) = Attribute v n
type IxValue (Point f a)
Instance details Defined in Linear.Affine type IxValue (Point f a) = IxValue (f a)
type IxValue (HashMap k a)
Instance details Defined in Control.Lens.At type IxValue (HashMap k a) = a
type IxValue (e -> a)
Instance details Defined in Control.Lens.At type IxValue (e -> a) = a
type IxValue (a, a2)	`ix` :: `Int` -> `Traversal'` (a,a) a
Instance details Defined in Control.Lens.At type IxValue (a, a2) = a
type IxValue (V n a)
Instance details Defined in Linear.V type IxValue (V n a) = a
type IxValue (a, a2, a3)	`ix` :: `Int` -> `Traversal'` (a,a,a) a
Instance details Defined in Control.Lens.At type IxValue (a, a2, a3) = a
type IxValue (a, a2, a3, a4)	`ix` :: `Int` -> `Traversal'` (a,a,a,a) a
Instance details Defined in Control.Lens.At type IxValue (a, a2, a3, a4) = a
type IxValue (a, a2, a3, a4, a5)	`ix` :: `Int` -> `Traversal'` (a,a,a,a,a) a
Instance details Defined in Control.Lens.At type IxValue (a, a2, a3, a4, a5) = a
type IxValue (a, a2, a3, a4, a5, a6)	`ix` :: `Int` -> `Traversal'` (a,a,a,a,a,a) a
Instance details Defined in Control.Lens.At type IxValue (a, a2, a3, a4, a5, a6) = a
type IxValue (a, a2, a3, a4, a5, a6, a7)	`ix` :: `Int` -> `Traversal'` (a,a,a,a,a,a,a) a
Instance details Defined in Control.Lens.At type IxValue (a, a2, a3, a4, a5, a6, a7) = a
type IxValue (a, a2, a3, a4, a5, a6, a7, a8)	`ix` :: `Int` -> `Traversal'` (a,a,a,a,a,a,a,a) a
Instance details Defined in Control.Lens.At type IxValue (a, a2, a3, a4, a5, a6, a7, a8) = a
type IxValue (a, a2, a3, a4, a5, a6, a7, a8, a9)	`ix` :: `Int` -> `Traversal'` (a,a,a,a,a,a,a,a,a) a
Instance details Defined in Control.Lens.At type IxValue (a, a2, a3, a4, a5, a6, a7, a8, a9) = a

class Ixed m where #

Provides a simple Traversal lets you traverse the value at a given key in a Map or element at an ordinal position in a list or Seq.

Minimal complete definition

Nothing

Methods

ix :: Index m -> Traversal' m (IxValue m) #

NB: Setting the value of this Traversal will only set the value in at if it is already present.

If you want to be able to insert missing values, you want at.

>>> Seq.fromList [a,b,c,d] & ix 2 %~ f
fromList [a,b,f c,d]

>>> Seq.fromList [a,b,c,d] & ix 2 .~ e
fromList [a,b,e,d]

>>> Seq.fromList [a,b,c,d] ^? ix 2
Just c

>>> Seq.fromList [] ^? ix 2
Nothing

Instances

Instances details

Ixed ByteString
Instance details Defined in Control.Lens.At Methods ix :: Index ByteString -> Traversal' ByteString (IxValue ByteString) #
Ixed ByteString
Instance details Defined in Control.Lens.At Methods ix :: Index ByteString -> Traversal' ByteString (IxValue ByteString) #
Ixed IntSet
Instance details Defined in Control.Lens.At Methods ix :: Index IntSet -> Traversal' IntSet (IxValue IntSet) #
Ixed Text
Instance details Defined in Control.Lens.At Methods ix :: Index Text -> Traversal' Text (IxValue Text) #
Ixed Text
Instance details Defined in Control.Lens.At Methods ix :: Index Text -> Traversal' Text (IxValue Text) #
Ixed (Identity a)
Instance details Defined in Control.Lens.At Methods ix :: Index (Identity a) -> Traversal' (Identity a) (IxValue (Identity a)) #
Ixed (IntMap a)
Instance details Defined in Control.Lens.At Methods ix :: Index (IntMap a) -> Traversal' (IntMap a) (IxValue (IntMap a)) #
Ixed (Seq a)
Instance details Defined in Control.Lens.At Methods ix :: Index (Seq a) -> Traversal' (Seq a) (IxValue (Seq a)) #
Ord k => Ixed (Set k)
Instance details Defined in Control.Lens.At Methods ix :: Index (Set k) -> Traversal' (Set k) (IxValue (Set k)) #
Ixed (Tree a)
Instance details Defined in Control.Lens.At Methods ix :: Index (Tree a) -> Traversal' (Tree a) (IxValue (Tree a)) #
Ixed (Plucker a)
Instance details Defined in Linear.Plucker Methods ix :: Index (Plucker a) -> Traversal' (Plucker a) (IxValue (Plucker a)) #
Ixed (Quaternion a)
Instance details Defined in Linear.Quaternion Methods ix :: Index (Quaternion a) -> Traversal' (Quaternion a) (IxValue (Quaternion a)) #
Ixed (V0 a)
Instance details Defined in Linear.V0 Methods ix :: Index (V0 a) -> Traversal' (V0 a) (IxValue (V0 a)) #
Ixed (V1 a)
Instance details Defined in Linear.V1 Methods ix :: Index (V1 a) -> Traversal' (V1 a) (IxValue (V1 a)) #
Ixed (V2 a)
Instance details Defined in Linear.V2 Methods ix :: Index (V2 a) -> Traversal' (V2 a) (IxValue (V2 a)) #
Ixed (V3 a)
Instance details Defined in Linear.V3 Methods ix :: Index (V3 a) -> Traversal' (V3 a) (IxValue (V3 a)) #
Ixed (V4 a)
Instance details Defined in Linear.V4 Methods ix :: Index (V4 a) -> Traversal' (V4 a) (IxValue (V4 a)) #
(Eq k, Hashable k) => Ixed (HashSet k)
Instance details Defined in Control.Lens.At Methods ix :: Index (HashSet k) -> Traversal' (HashSet k) (IxValue (HashSet k)) #
Ixed (Vector a)
Instance details Defined in Control.Lens.At Methods ix :: Index (Vector a) -> Traversal' (Vector a) (IxValue (Vector a)) #
Prim a => Ixed (Vector a)
Instance details Defined in Control.Lens.At Methods ix :: Index (Vector a) -> Traversal' (Vector a) (IxValue (Vector a)) #
Storable a => Ixed (Vector a)
Instance details Defined in Control.Lens.At Methods ix :: Index (Vector a) -> Traversal' (Vector a) (IxValue (Vector a)) #
Unbox a => Ixed (Vector a)
Instance details Defined in Control.Lens.At Methods ix :: Index (Vector a) -> Traversal' (Vector a) (IxValue (Vector a)) #
Ixed (NonEmpty a)
Instance details Defined in Control.Lens.At Methods ix :: Index (NonEmpty a) -> Traversal' (NonEmpty a) (IxValue (NonEmpty a)) #
Ixed (Maybe a)
Instance details Defined in Control.Lens.At Methods ix :: Index (Maybe a) -> Traversal' (Maybe a) (IxValue (Maybe a)) #
Ixed [a]
Instance details Defined in Control.Lens.At Methods ix :: Index [a] -> Traversal' [a] (IxValue [a]) #
(IArray UArray e, Ix i) => Ixed (UArray i e)	arr `!` i ≡ arr `^.` `ix` i arr `//` [(i,e)] ≡ `ix` i `.~` e `$` arr
Instance details Defined in Control.Lens.At Methods ix :: Index (UArray i e) -> Traversal' (UArray i e) (IxValue (UArray i e)) #
Ix i => Ixed (Array i e)	arr `!` i ≡ arr `^.` `ix` i arr `//` [(i,e)] ≡ `ix` i `.~` e `$` arr
Instance details Defined in Control.Lens.At Methods ix :: Index (Array i e) -> Traversal' (Array i e) (IxValue (Array i e)) #
Ord k => Ixed (Map k a)
Instance details Defined in Control.Lens.At Methods ix :: Index (Map k a) -> Traversal' (Map k a) (IxValue (Map k a)) #
Ixed (Style v n)
Instance details Defined in Diagrams.Core.Style Methods ix :: Index (Style v n) -> Traversal' (Style v n) (IxValue (Style v n)) #
Ixed (f a) => Ixed (Point f a)
Instance details Defined in Linear.Affine Methods ix :: Index (Point f a) -> Traversal' (Point f a) (IxValue (Point f a)) #
(Eq k, Hashable k) => Ixed (HashMap k a)
Instance details Defined in Control.Lens.At Methods ix :: Index (HashMap k a) -> Traversal' (HashMap k a) (IxValue (HashMap k a)) #
Eq e => Ixed (e -> a)
Instance details Defined in Control.Lens.At Methods ix :: Index (e -> a) -> Traversal' (e -> a) (IxValue (e -> a)) #
a ~ a2 => Ixed (a, a2)
Instance details Defined in Control.Lens.At Methods ix :: Index (a, a2) -> Traversal' (a, a2) (IxValue (a, a2)) #
Ixed (V n a)
Instance details Defined in Linear.V Methods ix :: Index (V n a) -> Traversal' (V n a) (IxValue (V n a)) #
(a ~ a2, a ~ a3) => Ixed (a, a2, a3)
Instance details Defined in Control.Lens.At Methods ix :: Index (a, a2, a3) -> Traversal' (a, a2, a3) (IxValue (a, a2, a3)) #
(a ~ a2, a ~ a3, a ~ a4) => Ixed (a, a2, a3, a4)
Instance details Defined in Control.Lens.At Methods ix :: Index (a, a2, a3, a4) -> Traversal' (a, a2, a3, a4) (IxValue (a, a2, a3, a4)) #
(a ~ a2, a ~ a3, a ~ a4, a ~ a5) => Ixed (a, a2, a3, a4, a5)
Instance details Defined in Control.Lens.At Methods ix :: Index (a, a2, a3, a4, a5) -> Traversal' (a, a2, a3, a4, a5) (IxValue (a, a2, a3, a4, a5)) #
(a ~ a2, a ~ a3, a ~ a4, a ~ a5, a ~ a6) => Ixed (a, a2, a3, a4, a5, a6)
Instance details Defined in Control.Lens.At Methods ix :: Index (a, a2, a3, a4, a5, a6) -> Traversal' (a, a2, a3, a4, a5, a6) (IxValue (a, a2, a3, a4, a5, a6)) #
(a ~ a2, a ~ a3, a ~ a4, a ~ a5, a ~ a6, a ~ a7) => Ixed (a, a2, a3, a4, a5, a6, a7)
Instance details Defined in Control.Lens.At Methods ix :: Index (a, a2, a3, a4, a5, a6, a7) -> Traversal' (a, a2, a3, a4, a5, a6, a7) (IxValue (a, a2, a3, a4, a5, a6, a7)) #
(a ~ a2, a ~ a3, a ~ a4, a ~ a5, a ~ a6, a ~ a7, a ~ a8) => Ixed (a, a2, a3, a4, a5, a6, a7, a8)
Instance details Defined in Control.Lens.At Methods ix :: Index (a, a2, a3, a4, a5, a6, a7, a8) -> Traversal' (a, a2, a3, a4, a5, a6, a7, a8) (IxValue (a, a2, a3, a4, a5, a6, a7, a8)) #
(a ~ a2, a ~ a3, a ~ a4, a ~ a5, a ~ a6, a ~ a7, a ~ a8, a ~ a9) => Ixed (a, a2, a3, a4, a5, a6, a7, a8, a9)
Instance details Defined in Control.Lens.At Methods ix :: Index (a, a2, a3, a4, a5, a6, a7, a8, a9) -> Traversal' (a, a2, a3, a4, a5, a6, a7, a8, a9) (IxValue (a, a2, a3, a4, a5, a6, a7, a8, a9)) #

class Ixed m => At m #

At provides a Lens that can be used to read, write or delete the value associated with a key in a Map-like container on an ad hoc basis.

An instance of At should satisfy:

ix k ≡ at k . traverse

Minimal complete definition

at

Instances

Instances details

At IntSet
Instance details Defined in Control.Lens.At Methods at :: Index IntSet -> Lens' IntSet (Maybe (IxValue IntSet)) #
At (IntMap a)
Instance details Defined in Control.Lens.At Methods at :: Index (IntMap a) -> Lens' (IntMap a) (Maybe (IxValue (IntMap a))) #
Ord k => At (Set k)
Instance details Defined in Control.Lens.At Methods at :: Index (Set k) -> Lens' (Set k) (Maybe (IxValue (Set k))) #
(Eq k, Hashable k) => At (HashSet k)
Instance details Defined in Control.Lens.At Methods at :: Index (HashSet k) -> Lens' (HashSet k) (Maybe (IxValue (HashSet k))) #
At (Maybe a)
Instance details Defined in Control.Lens.At Methods at :: Index (Maybe a) -> Lens' (Maybe a) (Maybe (IxValue (Maybe a))) #
Ord k => At (Map k a)
Instance details Defined in Control.Lens.At Methods at :: Index (Map k a) -> Lens' (Map k a) (Maybe (IxValue (Map k a))) #
At (Style v n)
Instance details Defined in Diagrams.Core.Style Methods at :: Index (Style v n) -> Lens' (Style v n) (Maybe (IxValue (Style v n))) #
(Eq k, Hashable k) => At (HashMap k a)
Instance details Defined in Control.Lens.At Methods at :: Index (HashMap k a) -> Lens' (HashMap k a) (Maybe (IxValue (HashMap k a))) #

class Each s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Extract each element of a (potentially monomorphic) container.

Notably, when applied to a tuple, this generalizes both to arbitrary homogeneous tuples.

>>> (1,2,3) & each *~ 10
(10,20,30)

It can also be used on monomorphic containers like Text or ByteString.

>>> over each Char.toUpper ("hello"^.Text.packed)
"HELLO"

>>> ("hello","world") & each.each %~ Char.toUpper
("HELLO","WORLD")

Minimal complete definition

Nothing

Methods

each :: Traversal s t a b #

Instances

Instances details

(a ~ Word8, b ~ Word8) => Each ByteString ByteString a b	`each` :: `Traversal` `ByteString` `ByteString` `Word8` `Word8`
Instance details Defined in Control.Lens.Each Methods each :: Traversal ByteString ByteString a b #
(a ~ Word8, b ~ Word8) => Each ByteString ByteString a b	`each` :: `Traversal` `ByteString` `ByteString` `Word8` `Word8`
Instance details Defined in Control.Lens.Each Methods each :: Traversal ByteString ByteString a b #
Each Name Name AName AName
Instance details Defined in Diagrams.Core.Names Methods each :: Traversal Name Name AName AName #
(a ~ Char, b ~ Char) => Each Text Text a b	`each` :: `Traversal` `Text` `Text` `Char` `Char`
Instance details Defined in Control.Lens.Each Methods each :: Traversal Text Text a b #
(a ~ Char, b ~ Char) => Each Text Text a b	`each` :: `Traversal` `Text` `Text` `Char` `Char`
Instance details Defined in Control.Lens.Each Methods each :: Traversal Text Text a b #
Each (Complex a) (Complex b) a b	`each` :: (`RealFloat` a, `RealFloat` b) => `Traversal` (`Complex` a) (`Complex` b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Complex a) (Complex b) a b #
Each (Identity a) (Identity b) a b	`each` :: `Traversal` (`Identity` a) (`Identity` b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Identity a) (Identity b) a b #
Each (IntMap a) (IntMap b) a b	`each` :: `Traversal` (`Map` c a) (`Map` c b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (IntMap a) (IntMap b) a b #
Each (Seq a) (Seq b) a b	`each` :: `Traversal` (`Seq` a) (`Seq` b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Seq a) (Seq b) a b #
Each (Tree a) (Tree b) a b	`each` :: `Traversal` (`Tree` a) (`Tree` b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Tree a) (Tree b) a b #
Each (Plucker a) (Plucker b) a b
Instance details Defined in Linear.Plucker Methods each :: Traversal (Plucker a) (Plucker b) a b #
Each (Quaternion a) (Quaternion b) a b
Instance details Defined in Linear.Quaternion Methods each :: Traversal (Quaternion a) (Quaternion b) a b #
Each (V0 a) (V0 b) a b
Instance details Defined in Linear.V0 Methods each :: Traversal (V0 a) (V0 b) a b #
Each (V1 a) (V1 b) a b
Instance details Defined in Linear.V1 Methods each :: Traversal (V1 a) (V1 b) a b #
Each (V2 a) (V2 b) a b
Instance details Defined in Linear.V2 Methods each :: Traversal (V2 a) (V2 b) a b #
Each (V3 a) (V3 b) a b
Instance details Defined in Linear.V3 Methods each :: Traversal (V3 a) (V3 b) a b #
Each (V4 a) (V4 b) a b
Instance details Defined in Linear.V4 Methods each :: Traversal (V4 a) (V4 b) a b #
Each (Maybe a) (Maybe b) a b	Since: lens-4.20
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Maybe a) (Maybe b) a b #
Each (Vector a) (Vector b) a b	`each` :: `Traversal` (`Vector` a) (`Vector` b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Vector a) (Vector b) a b #
(Prim a, Prim b) => Each (Vector a) (Vector b) a b	`each` :: (`Prim` a, `Prim` b) => `Traversal` (`Vector` a) (`Vector` b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Vector a) (Vector b) a b #
(Storable a, Storable b) => Each (Vector a) (Vector b) a b	`each` :: (`Storable` a, `Storable` b) => `Traversal` (`Vector` a) (`Vector` b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Vector a) (Vector b) a b #
(Unbox a, Unbox b) => Each (Vector a) (Vector b) a b	`each` :: (`Unbox` a, `Unbox` b) => `Traversal` (`Vector` a) (`Vector` b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Vector a) (Vector b) a b #
Each (NonEmpty a) (NonEmpty b) a b	`each` :: `Traversal` (NonEmpty a) (NonEmpty b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (NonEmpty a) (NonEmpty b) a b #
Each (Maybe a) (Maybe b) a b	`each` :: `Traversal` (`Maybe` a) (`Maybe` b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Maybe a) (Maybe b) a b #
Each [a] [b] a b	`each` :: `Traversal` [a] [b] a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal [a] [b] a b #
(Ix i, IArray UArray a, IArray UArray b, i ~ j) => Each (UArray i a) (UArray j b) a b	`each` :: (`Ix` i, `IArray` `UArray` a, `IArray` `UArray` b) => `Traversal` (`Array` i a) (`Array` i b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (UArray i a) (UArray j b) a b #
(a ~ a', b ~ b') => Each (Either a a') (Either b b') a b	`each` :: `Traversal` (`Either` a a) (`Either` b b) a b Since: lens-4.18
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Either a a') (Either b b') a b #
(Ix i, i ~ j) => Each (Array i a) (Array j b) a b	`each` :: `Ix` i => `Traversal` (`Array` i a) (`Array` i b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Array i a) (Array j b) a b #
c ~ d => Each (Map c a) (Map d b) a b	`each` :: `Traversal` (`Map` c a) (`Map` c b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Map c a) (Map d b) a b #
Traversable f => Each (Point f a) (Point f b) a b
Instance details Defined in Linear.Affine Methods each :: Traversal (Point f a) (Point f b) a b #
(a ~ a', b ~ b') => Each (Either a a') (Either b b') a b	Since: lens-4.20
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Either a a') (Either b b') a b #
(a ~ a', b ~ b') => Each (These a a') (These b b') a b	Since: lens-4.20
Instance details Defined in Control.Lens.Each Methods each :: Traversal (These a a') (These b b') a b #
(a ~ a', b ~ b') => Each (Pair a a') (Pair b b') a b	Since: lens-4.20
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Pair a a') (Pair b b') a b #
(a ~ a', b ~ b') => Each (These a a') (These b b') a b	Since: lens-4.20
Instance details Defined in Control.Lens.Each Methods each :: Traversal (These a a') (These b b') a b #
c ~ d => Each (HashMap c a) (HashMap d b) a b	`each` :: `Traversal` (`HashMap` c a) (`HashMap` c b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (HashMap c a) (HashMap d b) a b #
(a ~ a', b ~ b') => Each (a, a') (b, b') a b	`each` :: `Traversal` (a,a) (b,b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (a, a') (b, b') a b #
Each (Path v n) (Path v' n') (Located (Trail v n)) (Located (Trail v' n')) Source #
Instance details Defined in Diagrams.Path Methods each :: Traversal (Path v n) (Path v' n') (Located (Trail v n)) (Located (Trail v' n')) #
Each (Style v n) (Style v' n') (Attribute v n) (Attribute v' n')
Instance details Defined in Diagrams.Core.Style Methods each :: Traversal (Style v n) (Style v' n') (Attribute v n) (Attribute v' n') #
(Additive v', Foldable v', Ord n') => Each (BoundingBox v n) (BoundingBox v' n') (Point v n) (Point v' n') Source #	Only valid if the second point is not smaller than the first.
Instance details Defined in Diagrams.BoundingBox Methods each :: Traversal (BoundingBox v n) (BoundingBox v' n') (Point v n) (Point v' n') #
Each (FixedSegment v n) (FixedSegment v' n') (Point v n) (Point v' n') Source #
Instance details Defined in Diagrams.Segment Methods each :: Traversal (FixedSegment v n) (FixedSegment v' n') (Point v n) (Point v' n') #
Each (V n a) (V n b) a b
Instance details Defined in Linear.V Methods each :: Traversal (V n a) (V n b) a b #
(a ~ a2, a ~ a3, b ~ b2, b ~ b3) => Each (a, a2, a3) (b, b2, b3) a b	`each` :: `Traversal` (a,a,a) (b,b,b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (a, a2, a3) (b, b2, b3) a b #
Each (Offset c v n) (Offset c v' n') (v n) (v' n') Source #
Instance details Defined in Diagrams.Segment Methods each :: Traversal (Offset c v n) (Offset c v' n') (v n) (v' n') #
Each (Segment c v n) (Segment c v' n') (v n) (v' n') Source #
Instance details Defined in Diagrams.Segment Methods each :: Traversal (Segment c v n) (Segment c v' n') (v n) (v' n') #
(a ~ a2, a ~ a3, a ~ a4, b ~ b2, b ~ b3, b ~ b4) => Each (a, a2, a3, a4) (b, b2, b3, b4) a b	`each` :: `Traversal` (a,a,a,a) (b,b,b,b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (a, a2, a3, a4) (b, b2, b3, b4) a b #
(a ~ a2, a ~ a3, a ~ a4, a ~ a5, b ~ b2, b ~ b3, b ~ b4, b ~ b5) => Each (a, a2, a3, a4, a5) (b, b2, b3, b4, b5) a b	`each` :: `Traversal` (a,a,a,a,a) (b,b,b,b,b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (a, a2, a3, a4, a5) (b, b2, b3, b4, b5) a b #
(a ~ a2, a ~ a3, a ~ a4, a ~ a5, a ~ a6, b ~ b2, b ~ b3, b ~ b4, b ~ b5, b ~ b6) => Each (a, a2, a3, a4, a5, a6) (b, b2, b3, b4, b5, b6) a b	`each` :: `Traversal` (a,a,a,a,a,a) (b,b,b,b,b,b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (a, a2, a3, a4, a5, a6) (b, b2, b3, b4, b5, b6) a b #
(a ~ a2, a ~ a3, a ~ a4, a ~ a5, a ~ a6, a ~ a7, b ~ b2, b ~ b3, b ~ b4, b ~ b5, b ~ b6, b ~ b7) => Each (a, a2, a3, a4, a5, a6, a7) (b, b2, b3, b4, b5, b6, b7) a b	`each` :: `Traversal` (a,a,a,a,a,a,a) (b,b,b,b,b,b,b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (a, a2, a3, a4, a5, a6, a7) (b, b2, b3, b4, b5, b6, b7) a b #
(a ~ a2, a ~ a3, a ~ a4, a ~ a5, a ~ a6, a ~ a7, a ~ a8, b ~ b2, b ~ b3, b ~ b4, b ~ b5, b ~ b6, b ~ b7, b ~ b8) => Each (a, a2, a3, a4, a5, a6, a7, a8) (b, b2, b3, b4, b5, b6, b7, b8) a b	`each` :: `Traversal` (a,a,a,a,a,a,a,a) (b,b,b,b,b,b,b,b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (a, a2, a3, a4, a5, a6, a7, a8) (b, b2, b3, b4, b5, b6, b7, b8) a b #
(a ~ a2, a ~ a3, a ~ a4, a ~ a5, a ~ a6, a ~ a7, a ~ a8, a ~ a9, b ~ b2, b ~ b3, b ~ b4, b ~ b5, b ~ b6, b ~ b7, b ~ b8, b ~ b9) => Each (a, a2, a3, a4, a5, a6, a7, a8, a9) (b, b2, b3, b4, b5, b6, b7, b8, b9) a b	`each` :: `Traversal` (a,a,a,a,a,a,a,a,a) (b,b,b,b,b,b,b,b,b) a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (a, a2, a3, a4, a5, a6, a7, a8, a9) (b, b2, b3, b4, b5, b6, b7, b8, b9) a b #

gplate1 :: forall {k} (f :: k -> Type) (a :: k). (Generic1 f, GPlated1 f (Rep1 f)) => Traversal' (f a) (f a) #

Implement plate operation for a type using its Generic1 instance.

gplate :: (Generic a, GPlated a (Rep a)) => Traversal' a a #

Implement plate operation for a type using its Generic instance.

Note: the behavior may be different than with uniplate in some special cases. gplate doesn't look through other types in a group of mutually recursive types.

For example consider mutually recursive even and odd natural numbers:

>>> data Even = Z | E Odd deriving (Show, Generic, Data); data Odd = O Even deriving (Show, Generic, Data)

Then uniplate, which is based on Data, finds all even numbers less or equal than four:

>>> import Data.Data.Lens (uniplate)
>>> universeOf uniplate (E (O (E (O Z))))
[E (O (E (O Z))),E (O Z),Z]

but gplate doesn't see through Odd.

>>> universeOf gplate (E (O (E (O Z))))
[E (O (E (O Z)))]

If using Data is not an option, you can still write the traversal manually. It is sometimes useful to use helper traversals

>>> :{
let oddeven :: Traversal' Odd Even
    oddeven f (O n) = O <$> f n
    evenplate :: Traversal' Even Even
    evenplate f Z     = pure Z
    evenplate f (E n) = E <$> oddeven f n
:}

>>> universeOf evenplate (E (O (E (O Z))))
[E (O (E (O Z))),E (O Z),Z]

parts :: Plated a => Lens' a [a] #

The original uniplate combinator, implemented in terms of Plated as a Lens.

parts ≡ partsOf plate

The resulting Lens is safer to use as it ignores 'over-application' and deals gracefully with under-application, but it is only a proper Lens if you don't change the list length!

composOpFold :: Plated a => b -> (b -> b -> b) -> (a -> b) -> a -> b #

Fold the immediate children of a Plated container.

composOpFold z c f = foldrOf plate (c . f) z

para :: Plated a => (a -> [r] -> r) -> a -> r #

Perform a fold-like computation on each value, technically a paramorphism.

para ≡ paraOf plate

paraOf :: Getting (Endo [a]) a a -> (a -> [r] -> r) -> a -> r #

Perform a fold-like computation on each value, technically a paramorphism.

paraOf :: Fold a a -> (a -> [r] -> r) -> a -> r

holesOnOf :: Conjoined p => LensLike (Bazaar p r r) s t a b -> Over p (Bazaar p r r) a b r r -> s -> [Pretext p r r t] #

Extract one level of holes from a container in a region specified by one Traversal, using another.

holesOnOf b l ≡ holesOf (b . l)

holesOnOf :: Iso' s a       -> Iso' a a                -> s -> [Pretext (->) a a s]
holesOnOf :: Lens' s a      -> Lens' a a               -> s -> [Pretext (->) a a s]
holesOnOf :: Traversal' s a -> Traversal' a a          -> s -> [Pretext (->) a a s]
holesOnOf :: Lens' s a      -> IndexedLens' i a a      -> s -> [Pretext (Indexed i) a a s]
holesOnOf :: Traversal' s a -> IndexedTraversal' i a a -> s -> [Pretext (Indexed i) a a s]

holesOn :: Conjoined p => Over p (Bazaar p a a) s t a a -> s -> [Pretext p a a t] #

An alias for holesOf, provided for consistency with the other combinators.

holesOn ≡ holesOf

holesOn :: Iso' s a                -> s -> [Pretext (->) a a s]
holesOn :: Lens' s a               -> s -> [Pretext (->) a a s]
holesOn :: Traversal' s a          -> s -> [Pretext (->) a a s]
holesOn :: IndexedLens' i s a      -> s -> [Pretext (Indexed i) a a s]
holesOn :: IndexedTraversal' i s a -> s -> [Pretext (Indexed i) a a s]

holes :: Plated a => a -> [Pretext (->) a a a] #

The one-level version of context. This extracts a list of the immediate children as editable contexts.

Given a context you can use pos to see the values, peek at what the structure would be like with an edited result, or simply extract the original structure.

propChildren x = children l x == map pos (holes l x)
propId x = all (== x) [extract w | w <- holes l x]

holes = holesOf plate

contextsOnOf :: ATraversal s t a a -> ATraversal' a a -> s -> [Context a a t] #

Return a list of all of the editable contexts for every location in the structure in an areas indicated by a user supplied Traversal, recursively using another user-supplied Traversal to walk each layer.

contextsOnOf :: Traversal' s a -> Traversal' a a -> s -> [Context a a s]

contextsOn :: Plated a => ATraversal s t a a -> s -> [Context a a t] #

Return a list of all of the editable contexts for every location in the structure in an areas indicated by a user supplied Traversal, recursively using plate.

contextsOn b ≡ contextsOnOf b plate

contextsOn :: Plated a => Traversal' s a -> s -> [Context a a s]

contextsOf :: ATraversal' a a -> a -> [Context a a a] #

Return a list of all of the editable contexts for every location in the structure, recursively, using a user-specified Traversal to walk each layer.

propUniverse l x = universeOf l x == map pos (contextsOf l x)
propId l x = all (== x) [extract w | w <- contextsOf l x]

contextsOf :: Traversal' a a -> a -> [Context a a a]

contexts :: Plated a => a -> [Context a a a] #

Return a list of all of the editable contexts for every location in the structure, recursively.

propUniverse x = universe x == map pos (contexts x)
propId x = all (== x) [extract w | w <- contexts x]

contexts ≡ contextsOf plate

transformMOnOf :: Monad m => LensLike (WrappedMonad m) s t a b -> LensLike (WrappedMonad m) a b a b -> (b -> m b) -> s -> m t #

Transform every element in a tree that lies in a region indicated by a supplied Traversal, walking with a user supplied Traversal in a bottom-up manner with a monadic effect.

transformMOnOf :: Monad m => Traversal' s a -> Traversal' a a -> (a -> m a) -> s -> m s

transformMOf :: Monad m => LensLike (WrappedMonad m) a b a b -> (b -> m b) -> a -> m b #

Transform every element in a tree using a user supplied Traversal in a bottom-up manner with a monadic effect.

transformMOf :: Monad m => Traversal' a a -> (a -> m a) -> a -> m a

transformMOn :: (Monad m, Plated a) => LensLike (WrappedMonad m) s t a a -> (a -> m a) -> s -> m t #

Transform every element in the tree in a region indicated by a supplied Traversal, in a bottom-up manner, monadically.

transformMOn :: (Monad m, Plated a) => Traversal' s a -> (a -> m a) -> s -> m s

transformM :: (Monad m, Plated a) => (a -> m a) -> a -> m a #

Transform every element in the tree, in a bottom-up manner, monadically.

transformOnOf :: ASetter s t a b -> ASetter a b a b -> (b -> b) -> s -> t #

Transform every element in a region indicated by a Setter by recursively applying another Setter in a bottom-up manner.

transformOnOf :: Setter' s a -> Traversal' a a -> (a -> a) -> s -> s
transformOnOf :: Setter' s a -> Setter' a a    -> (a -> a) -> s -> s

transformOf :: ASetter a b a b -> (b -> b) -> a -> b #

Transform every element by recursively applying a given Setter in a bottom-up manner.

transformOf :: Traversal' a a -> (a -> a) -> a -> a
transformOf :: Setter' a a    -> (a -> a) -> a -> a

transformOn :: Plated a => ASetter s t a a -> (a -> a) -> s -> t #

Transform every element in the tree in a bottom-up manner over a region indicated by a Setter.

transformOn :: Plated a => Traversal' s a -> (a -> a) -> s -> s
transformOn :: Plated a => Setter' s a    -> (a -> a) -> s -> s

cosmosOnOf :: (Applicative f, Contravariant f) => LensLike' f s a -> LensLike' f a a -> LensLike' f s a #

Given a Fold that knows how to locate immediate children, fold all of the transitive descendants of a node, including itself that lie in a region indicated by another Fold.

cosmosOnOf :: Fold s a -> Fold a a -> Fold s a

cosmosOn :: (Applicative f, Contravariant f, Plated a) => LensLike' f s a -> LensLike' f s a #

Given a Fold that knows how to find Plated parts of a container fold them and all of their descendants, recursively.

cosmosOn :: Plated a => Fold s a -> Fold s a

cosmosOf :: (Applicative f, Contravariant f) => LensLike' f a a -> LensLike' f a a #

Given a Fold that knows how to locate immediate children, fold all of the transitive descendants of a node, including itself.

cosmosOf :: Fold a a -> Fold a a

cosmos :: Plated a => Fold a a #

Fold over all transitive descendants of a Plated container, including itself.

universeOnOf :: Getting (Endo [a]) s a -> Getting (Endo [a]) a a -> s -> [a] #

Given a Fold that knows how to locate immediate children, retrieve all of the transitive descendants of a node, including itself that lie in a region indicated by another Fold.

toListOf l ≡ universeOnOf l ignored

universeOn :: Plated a => Getting (Endo [a]) s a -> s -> [a] #

Given a Fold that knows how to find Plated parts of a container retrieve them and all of their descendants, recursively.

universeOf :: Getting (Endo [a]) a a -> a -> [a] #

Given a Fold that knows how to locate immediate children, retrieve all of the transitive descendants of a node, including itself.

universeOf :: Fold a a -> a -> [a]

universe :: Plated a => a -> [a] #

Retrieve all of the transitive descendants of a Plated container, including itself.

rewriteMOnOf :: Monad m => LensLike (WrappedMonad m) s t a b -> LensLike (WrappedMonad m) a b a b -> (b -> m (Maybe a)) -> s -> m t #

Rewrite by applying a monadic rule everywhere inside of a structure located by a user-specified Traversal, using a user-specified Traversal for recursion. Ensures that the rule cannot be applied anywhere in the result.

rewriteMOn :: (Monad m, Plated a) => LensLike (WrappedMonad m) s t a a -> (a -> m (Maybe a)) -> s -> m t #

Rewrite by applying a monadic rule everywhere inside of a structure located by a user-specified Traversal. Ensures that the rule cannot be applied anywhere in the result.

rewriteMOf :: Monad m => LensLike (WrappedMonad m) a b a b -> (b -> m (Maybe a)) -> a -> m b #

Rewrite by applying a monadic rule everywhere you recursing with a user-specified Traversal. Ensures that the rule cannot be applied anywhere in the result.

rewriteM :: (Monad m, Plated a) => (a -> m (Maybe a)) -> a -> m a #

Rewrite by applying a monadic rule everywhere you can. Ensures that the rule cannot be applied anywhere in the result.

rewriteOnOf :: ASetter s t a b -> ASetter a b a b -> (b -> Maybe a) -> s -> t #

Rewrite recursively over part of a larger structure using a specified Setter.

rewriteOnOf :: Iso' s a       -> Iso' a a       -> (a -> Maybe a) -> s -> s
rewriteOnOf :: Lens' s a      -> Lens' a a      -> (a -> Maybe a) -> s -> s
rewriteOnOf :: Traversal' s a -> Traversal' a a -> (a -> Maybe a) -> s -> s
rewriteOnOf :: Setter' s a    -> Setter' a a    -> (a -> Maybe a) -> s -> s

rewriteOn :: Plated a => ASetter s t a a -> (a -> Maybe a) -> s -> t #

Rewrite recursively over part of a larger structure.

rewriteOn :: Plated a => Iso' s a       -> (a -> Maybe a) -> s -> s
rewriteOn :: Plated a => Lens' s a      -> (a -> Maybe a) -> s -> s
rewriteOn :: Plated a => Traversal' s a -> (a -> Maybe a) -> s -> s
rewriteOn :: Plated a => ASetter' s a   -> (a -> Maybe a) -> s -> s

rewriteOf :: ASetter a b a b -> (b -> Maybe a) -> a -> b #

Rewrite by applying a rule everywhere you can. Ensures that the rule cannot be applied anywhere in the result:

propRewriteOf l r x = all (isNothing . r) (universeOf l (rewriteOf l r x))

Usually transformOf is more appropriate, but rewriteOf can give better compositionality. Given two single transformations f and g, you can construct \a -> f a <|> g a which performs both rewrites until a fixed point.

rewriteOf :: Iso' a a       -> (a -> Maybe a) -> a -> a
rewriteOf :: Lens' a a      -> (a -> Maybe a) -> a -> a
rewriteOf :: Traversal' a a -> (a -> Maybe a) -> a -> a
rewriteOf :: Setter' a a    -> (a -> Maybe a) -> a -> a

rewrite :: Plated a => (a -> Maybe a) -> a -> a #

Rewrite by applying a rule everywhere you can. Ensures that the rule cannot be applied anywhere in the result:

propRewrite r x = all (isNothing . r) (universe (rewrite r x))

Usually transform is more appropriate, but rewrite can give better compositionality. Given two single transformations f and g, you can construct \a -> f a <|> g a which performs both rewrites until a fixed point.

deep :: (Conjoined p, Applicative f, Plated s) => Traversing p f s s a b -> Over p f s s a b #

Try to apply a traversal to all transitive descendants of a Plated container, but do not recurse through matching descendants.

deep :: Plated s => Fold s a                 -> Fold s a
deep :: Plated s => IndexedFold s a          -> IndexedFold s a
deep :: Plated s => Traversal s s a b        -> Traversal s s a b
deep :: Plated s => IndexedTraversal s s a b -> IndexedTraversal s s a b

class Plated a where #

A Plated type is one where we know how to extract its immediate self-similar children.

Example 1:

import Control.Applicative
import Control.Lens
import Control.Lens.Plated
import Data.Data
import Data.Data.Lens (uniplate)

data Expr
  = Val Int
  | Neg Expr
  | Add Expr Expr
  deriving (Eq,Ord,Show,Read,Data)

instance Plated Expr where
  plate f (Neg e) = Neg <$> f e
  plate f (Add a b) = Add <$> f a <*> f b
  plate _ a = pure a

or

instance Plated Expr where
  plate = uniplate

Example 2:

import Control.Applicative
import Control.Lens
import Control.Lens.Plated
import Data.Data
import Data.Data.Lens (uniplate)

data Tree a
  = Bin (Tree a) (Tree a)
  | Tip a
  deriving (Eq,Ord,Show,Read,Data)

instance Plated (Tree a) where
  plate f (Bin l r) = Bin <$> f l <*> f r
  plate _ t = pure t

or

instance Data a => Plated (Tree a) where
  plate = uniplate

Note the big distinction between these two implementations.

The former will only treat children directly in this tree as descendents, the latter will treat trees contained in the values under the tips also as descendants!

When in doubt, pick a Traversal and just use the various ...Of combinators rather than pollute Plated with orphan instances!

If you want to find something unplated and non-recursive with biplate use the ...OnOf variant with ignored, though those usecases are much better served in most cases by using the existing Lens combinators! e.g.

toListOf biplate ≡ universeOnOf biplate ignored

This same ability to explicitly pass the Traversal in question is why there is no analogue to uniplate's Biplate.

Moreover, since we can allow custom traversals, we implement reasonable defaults for polymorphic data types, that only traverse into themselves, and not their polymorphic arguments.

Minimal complete definition

Nothing

Methods

plate :: Traversal' a a #

Traversal of the immediate children of this structure.

If you're using GHC 7.2 or newer and your type has a Data instance, plate will default to uniplate and you can choose to not override it with your own definition.

Instances

Instances details

Plated Con
Instance details Defined in Control.Lens.Plated Methods plate :: Traversal' Con Con #
Plated Dec
Instance details Defined in Control.Lens.Plated Methods plate :: Traversal' Dec Dec #
Plated Exp
Instance details Defined in Control.Lens.Plated Methods plate :: Traversal' Exp Exp #
Plated Pat
Instance details Defined in Control.Lens.Plated Methods plate :: Traversal' Pat Pat #
Plated Stmt
Instance details Defined in Control.Lens.Plated Methods plate :: Traversal' Stmt Stmt #
Plated Type
Instance details Defined in Control.Lens.Plated Methods plate :: Traversal' Type Type #
Plated (Tree a)
Instance details Defined in Control.Lens.Plated Methods plate :: Traversal' (Tree a) (Tree a) #
Plated [a]
Instance details Defined in Control.Lens.Plated Methods plate :: Traversal' [a] [a] #
Traversable f => Plated (Cofree f a)
Instance details Defined in Control.Lens.Plated Methods plate :: Traversal' (Cofree f a) (Cofree f a) #
Traversable f => Plated (Free f a)
Instance details Defined in Control.Lens.Plated Methods plate :: Traversal' (Free f a) (Free f a) #
Traversable f => Plated (F f a)
Instance details Defined in Control.Lens.Plated Methods plate :: Traversal' (F f a) (F f a) #
(Traversable f, Traversable w) => Plated (CofreeT f w a)
Instance details Defined in Control.Lens.Plated Methods plate :: Traversal' (CofreeT f w a) (CofreeT f w a) #
(Traversable f, Traversable m) => Plated (FreeT f m a)
Instance details Defined in Control.Lens.Plated Methods plate :: Traversal' (FreeT f m a) (FreeT f m a) #

class GPlated a (g :: k -> Type) #

Minimal complete definition

gplate'

Instances

Instances details

GPlated a (U1 :: k -> Type)
Instance details Defined in Control.Lens.Plated Methods gplate' :: forall (p :: k0). Traversal' (U1 p) a
GPlated a (V1 :: k -> Type)
Instance details Defined in Control.Lens.Plated Methods gplate' :: forall (p :: k0). Traversal' (V1 p) a
GPlated a (URec b :: k -> Type)
Instance details Defined in Control.Lens.Plated Methods gplate' :: forall (p :: k0). Traversal' (URec b p) a
(GPlated a f, GPlated a g) => GPlated a (f :*: g :: k -> Type)
Instance details Defined in Control.Lens.Plated Methods gplate' :: forall (p :: k0). Traversal' ((f :*: g) p) a
(GPlated a f, GPlated a g) => GPlated a (f :+: g :: k -> Type)
Instance details Defined in Control.Lens.Plated Methods gplate' :: forall (p :: k0). Traversal' ((f :+: g) p) a
GPlated a (K1 i a :: k -> Type)
Instance details Defined in Control.Lens.Plated Methods gplate' :: forall (p :: k0). Traversal' (K1 i a p) a
GPlated a (K1 i b :: k -> Type)
Instance details Defined in Control.Lens.Plated Methods gplate' :: forall (p :: k0). Traversal' (K1 i b p) a
GPlated a f => GPlated a (M1 i c f :: k -> Type)
Instance details Defined in Control.Lens.Plated Methods gplate' :: forall (p :: k0). Traversal' (M1 i c f p) a

class GPlated1 (f :: k -> Type) (g :: k -> Type) #

Minimal complete definition

gplate1'

Instances

Instances details

GPlated1 (f :: Type -> Type) Par1	ignored
Instance details Defined in Control.Lens.Plated Methods gplate1' :: forall (a :: k). Traversal' (Par1 a) (f a)
GPlated1 (f :: k -> Type) (U1 :: k -> Type)	ignored
Instance details Defined in Control.Lens.Plated Methods gplate1' :: forall (a :: k0). Traversal' (U1 a) (f a)
GPlated1 (f :: k -> Type) (V1 :: k -> Type)	ignored
Instance details Defined in Control.Lens.Plated Methods gplate1' :: forall (a :: k0). Traversal' (V1 a) (f a)
GPlated1 (f :: k -> Type) (Rec1 f :: k -> Type)	match
Instance details Defined in Control.Lens.Plated Methods gplate1' :: forall (a :: k0). Traversal' (Rec1 f a) (f a)
GPlated1 (f :: k -> Type) (Rec1 g :: k -> Type)	ignored
Instance details Defined in Control.Lens.Plated Methods gplate1' :: forall (a :: k0). Traversal' (Rec1 g a) (f a)
GPlated1 (f :: k -> Type) (URec a :: k -> Type)	ignored
Instance details Defined in Control.Lens.Plated Methods gplate1' :: forall (a0 :: k0). Traversal' (URec a a0) (f a0)
(GPlated1 f g, GPlated1 f h) => GPlated1 (f :: k -> Type) (g :*: h :: k -> Type)	recursive match
Instance details Defined in Control.Lens.Plated Methods gplate1' :: forall (a :: k0). Traversal' ((g :*: h) a) (f a)
(GPlated1 f g, GPlated1 f h) => GPlated1 (f :: k -> Type) (g :+: h :: k -> Type)	recursive match
Instance details Defined in Control.Lens.Plated Methods gplate1' :: forall (a :: k0). Traversal' ((g :+: h) a) (f a)
GPlated1 (f :: k -> Type) (K1 i a :: k -> Type)	ignored
Instance details Defined in Control.Lens.Plated Methods gplate1' :: forall (a0 :: k0). Traversal' (K1 i a a0) (f a0)
GPlated1 f g => GPlated1 (f :: k -> Type) (M1 i c g :: k -> Type)	recursive match
Instance details Defined in Control.Lens.Plated Methods gplate1' :: forall (a :: k0). Traversal' (M1 i c g a) (f a)
(Traversable t, GPlated1 f g) => GPlated1 (f :: k1 -> Type) (t :.: g :: k1 -> Type)	recursive match under outer `Traversable` instance
Instance details Defined in Control.Lens.Plated Methods gplate1' :: forall (a :: k). Traversal' ((t :.: g) a) (f a)

type family Zoomed (m :: Type -> Type) :: Type -> Type -> Type #

This type family is used by Zoom to describe the common effect type.

Instances

Instances details

type Zoomed (ListT m)
Instance details Defined in Control.Lens.Zoom type Zoomed (ListT m) = FocusingOn [] (Zoomed m)
type Zoomed (MaybeT m)
Instance details Defined in Control.Lens.Zoom type Zoomed (MaybeT m) = FocusingMay (Zoomed m)
type Zoomed (FreeT f m)
Instance details Defined in Control.Lens.Zoom type Zoomed (FreeT f m) = FocusingFree f m (Zoomed m)
type Zoomed (ErrorT e m)
Instance details Defined in Control.Lens.Zoom type Zoomed (ErrorT e m) = FocusingErr e (Zoomed m)
type Zoomed (ExceptT e m)
Instance details Defined in Control.Lens.Zoom type Zoomed (ExceptT e m) = FocusingErr e (Zoomed m)
type Zoomed (IdentityT m)
Instance details Defined in Control.Lens.Zoom type Zoomed (IdentityT m) = Zoomed m
type Zoomed (ReaderT e m)
Instance details Defined in Control.Lens.Zoom type Zoomed (ReaderT e m) = Zoomed m
type Zoomed (StateT s z)
Instance details Defined in Control.Lens.Zoom type Zoomed (StateT s z) = Focusing z
type Zoomed (StateT s z)
Instance details Defined in Control.Lens.Zoom type Zoomed (StateT s z) = Focusing z
type Zoomed (WriterT w m)
Instance details Defined in Control.Lens.Zoom type Zoomed (WriterT w m) = FocusingPlus w (Zoomed m)
type Zoomed (WriterT w m)
Instance details Defined in Control.Lens.Zoom type Zoomed (WriterT w m) = FocusingPlus w (Zoomed m)
type Zoomed (RWST r w s z)
Instance details Defined in Control.Lens.Zoom type Zoomed (RWST r w s z) = FocusingWith w z
type Zoomed (RWST r w s z)
Instance details Defined in Control.Lens.Zoom type Zoomed (RWST r w s z) = FocusingWith w z

type family Magnified (m :: Type -> Type) :: Type -> Type -> Type #

This type family is used by Magnify to describe the common effect type.

Instances

Instances details

type Magnified (IdentityT m)
Instance details Defined in Control.Lens.Zoom type Magnified (IdentityT m) = Magnified m
type Magnified (ReaderT b m)
Instance details Defined in Control.Lens.Zoom type Magnified (ReaderT b m) = Effect m
type Magnified ((->) b)
Instance details Defined in Control.Lens.Zoom type Magnified ((->) b) = Const :: Type -> Type -> Type
type Magnified (RWST a w s m)
Instance details Defined in Control.Lens.Zoom type Magnified (RWST a w s m) = EffectRWS w s m
type Magnified (RWST a w s m)
Instance details Defined in Control.Lens.Zoom type Magnified (RWST a w s m) = EffectRWS w s m

class (MonadState s m, MonadState t n) => Zoom (m :: Type -> Type) (n :: Type -> Type) s t | m -> s, n -> t, m t -> n, n s -> m where #

This class allows us to use zoom in, changing the State supplied by many different Monad transformers, potentially quite deep in a Monad transformer stack.

Methods

zoom :: LensLike' (Zoomed m c) t s -> m c -> n c infixr 2 #

Run a monadic action in a larger State than it was defined in, using a Lens' or Traversal'.

This is commonly used to lift actions in a simpler State Monad into a State Monad with a larger State type.

When applied to a Traversal' over multiple values, the actions for each target are executed sequentially and the results are aggregated.

This can be used to edit pretty much any Monad transformer stack with a State in it!

>>> flip State.evalState (a,b) $ zoom _1 $ use id
a

>>> flip State.execState (a,b) $ zoom _1 $ id .= c
(c,b)

>>> flip State.execState [(a,b),(c,d)] $ zoom traverse $ _2 %= f
[(a,f b),(c,f d)]

>>> flip State.runState [(a,b),(c,d)] $ zoom traverse $ _2 <%= f
(f b <> f d <> mempty,[(a,f b),(c,f d)])

>>> flip State.evalState (a,b) $ zoom both (use id)
a <> b

zoom :: Monad m             => Lens' s t      -> StateT t m a -> StateT s m a
zoom :: (Monad m, Monoid c) => Traversal' s t -> StateT t m c -> StateT s m c
zoom :: (Monad m, Monoid w)             => Lens' s t      -> RWST r w t m c -> RWST r w s m c
zoom :: (Monad m, Monoid w, Monoid c) => Traversal' s t -> RWST r w t m c -> RWST r w s m c
zoom :: (Monad m, Monoid w, Error e)  => Lens' s t      -> ErrorT e (RWST r w t m) c -> ErrorT e (RWST r w s m) c
zoom :: (Monad m, Monoid w, Monoid c, Error e) => Traversal' s t -> ErrorT e (RWST r w t m) c -> ErrorT e (RWST r w s m) c
...

Instances

Instances details

Zoom m n s t => Zoom (ListT m) (ListT n) s t
Instance details Defined in Control.Lens.Zoom Methods zoom :: LensLike' (Zoomed (ListT m) c) t s -> ListT m c -> ListT n c #
Zoom m n s t => Zoom (MaybeT m) (MaybeT n) s t
Instance details Defined in Control.Lens.Zoom Methods zoom :: LensLike' (Zoomed (MaybeT m) c) t s -> MaybeT m c -> MaybeT n c #
(Functor f, Zoom m n s t) => Zoom (FreeT f m) (FreeT f n) s t
Instance details Defined in Control.Lens.Zoom Methods zoom :: LensLike' (Zoomed (FreeT f m) c) t s -> FreeT f m c -> FreeT f n c #
(Error e, Zoom m n s t) => Zoom (ErrorT e m) (ErrorT e n) s t
Instance details Defined in Control.Lens.Zoom Methods zoom :: LensLike' (Zoomed (ErrorT e m) c) t s -> ErrorT e m c -> ErrorT e n c #
Zoom m n s t => Zoom (ExceptT e m) (ExceptT e n) s t
Instance details Defined in Control.Lens.Zoom Methods zoom :: LensLike' (Zoomed (ExceptT e m) c) t s -> ExceptT e m c -> ExceptT e n c #
Zoom m n s t => Zoom (IdentityT m) (IdentityT n) s t
Instance details Defined in Control.Lens.Zoom Methods zoom :: LensLike' (Zoomed (IdentityT m) c) t s -> IdentityT m c -> IdentityT n c #
Zoom m n s t => Zoom (ReaderT e m) (ReaderT e n) s t
Instance details Defined in Control.Lens.Zoom Methods zoom :: LensLike' (Zoomed (ReaderT e m) c) t s -> ReaderT e m c -> ReaderT e n c #
Monad z => Zoom (StateT s z) (StateT t z) s t
Instance details Defined in Control.Lens.Zoom Methods zoom :: LensLike' (Zoomed (StateT s z) c) t s -> StateT s z c -> StateT t z c #
Monad z => Zoom (StateT s z) (StateT t z) s t
Instance details Defined in Control.Lens.Zoom Methods zoom :: LensLike' (Zoomed (StateT s z) c) t s -> StateT s z c -> StateT t z c #
(Monoid w, Zoom m n s t) => Zoom (WriterT w m) (WriterT w n) s t
Instance details Defined in Control.Lens.Zoom Methods zoom :: LensLike' (Zoomed (WriterT w m) c) t s -> WriterT w m c -> WriterT w n c #
(Monoid w, Zoom m n s t) => Zoom (WriterT w m) (WriterT w n) s t
Instance details Defined in Control.Lens.Zoom Methods zoom :: LensLike' (Zoomed (WriterT w m) c) t s -> WriterT w m c -> WriterT w n c #
(Monoid w, Monad z) => Zoom (RWST r w s z) (RWST r w t z) s t
Instance details Defined in Control.Lens.Zoom Methods zoom :: LensLike' (Zoomed (RWST r w s z) c) t s -> RWST r w s z c -> RWST r w t z c #
(Monoid w, Monad z) => Zoom (RWST r w s z) (RWST r w t z) s t
Instance details Defined in Control.Lens.Zoom Methods zoom :: LensLike' (Zoomed (RWST r w s z) c) t s -> RWST r w s z c -> RWST r w t z c #

class (Magnified m ~ Magnified n, MonadReader b m, MonadReader a n) => Magnify (m :: Type -> Type) (n :: Type -> Type) b a | m -> b, n -> a, m a -> n, n b -> m where #

This class allows us to use magnify part of the environment, changing the environment supplied by many different Monad transformers. Unlike zoom this can change the environment of a deeply nested Monad transformer.

Also, unlike zoom, this can be used with any valid Getter, but cannot be used with a Traversal or Fold.

Methods

magnify :: ((Functor (Magnified m c), Contravariant (Magnified m c)) => LensLike' (Magnified m c) a b) -> m c -> n c infixr 2 #

Run a monadic action in a larger environment than it was defined in, using a Getter.

This acts like local, but can in many cases change the type of the environment as well.

This is commonly used to lift actions in a simpler Reader Monad into a Monad with a larger environment type.

This can be used to edit pretty much any Monad transformer stack with an environment in it:

>>> (1,2) & magnify _2 (+1)
3

>>> flip Reader.runReader (1,2) $ magnify _1 Reader.ask
1

>>> flip Reader.runReader (1,2,[10..20]) $ magnify (_3._tail) Reader.ask
[11,12,13,14,15,16,17,18,19,20]

The type can be read as

  magnify :: LensLike' (Magnified m c) a b -> m c -> n c

but the higher-rank constraints make it easier to apply magnify to a Getter in highly-polymorphic code.

magnify :: Getter s a -> (a -> r) -> s -> r
magnify :: Monoid r => Fold s a   -> (a -> r) -> s -> r

magnify :: Monoid w                 => Getter s t -> RWS t w st c -> RWS s w st c
magnify :: (Monoid w, Monoid c) => Fold s a   -> RWS a w st c -> RWS s w st c
...

Instances

Instances details

Magnify m n b a => Magnify (IdentityT m) (IdentityT n) b a
Instance details Defined in Control.Lens.Zoom Methods magnify :: ((Functor (Magnified (IdentityT m) c), Contravariant (Magnified (IdentityT m) c)) => LensLike' (Magnified (IdentityT m) c) a b) -> IdentityT m c -> IdentityT n c #
Monad m => Magnify (ReaderT b m) (ReaderT a m) b a
Instance details Defined in Control.Lens.Zoom Methods magnify :: ((Functor (Magnified (ReaderT b m) c), Contravariant (Magnified (ReaderT b m) c)) => LensLike' (Magnified (ReaderT b m) c) a b) -> ReaderT b m c -> ReaderT a m c #
Magnify ((->) b) ((->) a) b a	`magnify` = `views`
Instance details Defined in Control.Lens.Zoom Methods magnify :: ((Functor (Magnified ((->) b) c), Contravariant (Magnified ((->) b) c)) => LensLike' (Magnified ((->) b) c) a b) -> (b -> c) -> a -> c #
(Monad m, Monoid w) => Magnify (RWST b w s m) (RWST a w s m) b a
Instance details Defined in Control.Lens.Zoom Methods magnify :: ((Functor (Magnified (RWST b w s m) c), Contravariant (Magnified (RWST b w s m) c)) => LensLike' (Magnified (RWST b w s m) c) a b) -> RWST b w s m c -> RWST a w s m c #
(Monad m, Monoid w) => Magnify (RWST b w s m) (RWST a w s m) b a
Instance details Defined in Control.Lens.Zoom Methods magnify :: ((Functor (Magnified (RWST b w s m) c), Contravariant (Magnified (RWST b w s m) c)) => LensLike' (Magnified (RWST b w s m) c) a b) -> RWST b w s m c -> RWST a w s m c #

alaf :: (Functor f, Functor g, Rewrapping s t) => (Unwrapped s -> s) -> (f t -> g s) -> f (Unwrapped t) -> g (Unwrapped s) #

This combinator is based on ala' from Conor McBride's work on Epigram.

As with _Wrapping, the user supplied function for the newtype is ignored.

alaf :: Rewrapping s t => (Unwrapped s -> s) -> ((r -> t) -> e -> s) -> (r -> Unwrapped t) -> e -> Unwrapped s

>>> alaf Sum foldMap Prelude.length ["hello","world"]
10

ala :: (Functor f, Rewrapping s t) => (Unwrapped s -> s) -> ((Unwrapped t -> t) -> f s) -> f (Unwrapped s) #

This combinator is based on ala from Conor McBride's work on Epigram.

As with _Wrapping, the user supplied function for the newtype is ignored.

>>> ala Sum foldMap [1,2,3,4]
10

>>> ala All foldMap [True,True]
True

>>> ala All foldMap [True,False]
False

>>> ala Any foldMap [False,False]
False

>>> ala Any foldMap [True,False]
True

>>> ala Product foldMap [1,2,3,4]
24

You may want to think of this combinator as having the following, simpler, type.

ala :: Rewrapping s t => (Unwrapped s -> s) -> ((Unwrapped t -> t) -> e -> s) -> e -> Unwrapped s

_Unwrapping :: Rewrapping s t => (Unwrapped s -> s) -> Iso (Unwrapped t) (Unwrapped s) t s #

This is a convenient version of _Unwrapped with an argument that's ignored.

The user supplied function is ignored, merely its types are used.

_Wrapping :: Rewrapping s t => (Unwrapped s -> s) -> Iso s t (Unwrapped s) (Unwrapped t) #

This is a convenient version of _Wrapped with an argument that's ignored.

The user supplied function is ignored, merely its types are used.

_Unwrapping' :: Wrapped s => (Unwrapped s -> s) -> Iso' (Unwrapped s) s #

This is a convenient version of _Wrapped with an argument that's ignored.

The user supplied function is ignored, merely its type is used.

_Wrapping' :: Wrapped s => (Unwrapped s -> s) -> Iso' s (Unwrapped s) #

This is a convenient version of _Wrapped with an argument that's ignored.

The user supplied function is ignored, merely its type is used.

op :: Wrapped s => (Unwrapped s -> s) -> s -> Unwrapped s #

Given the constructor for a Wrapped type, return a deconstructor that is its inverse.

Assuming the Wrapped instance is legal, these laws hold:

op f . f ≡ id
f . op f ≡ id

>>> op Identity (Identity 4)
4

>>> op Const (Const "hello")
"hello"

_Unwrapped :: Rewrapping s t => Iso (Unwrapped t) (Unwrapped s) t s #

_Wrapped :: Rewrapping s t => Iso s t (Unwrapped s) (Unwrapped t) #

Work under a newtype wrapper.

>>> Const "hello" & _Wrapped %~ Prelude.length & getConst
5

_Wrapped   ≡ from _Unwrapped
_Unwrapped ≡ from _Wrapped

_Unwrapped' :: Wrapped s => Iso' (Unwrapped s) s #

_GWrapped' :: forall s (d :: Meta) (c :: Meta) (s' :: Meta) a. (Generic s, D1 d (C1 c (S1 s' (Rec0 a))) ~ Rep s, Unwrapped s ~ GUnwrapped (Rep s)) => Iso' s (Unwrapped s) #

Implement the _Wrapped operation for a type using its Generic instance.

pattern Wrapped :: Rewrapped s s => Unwrapped s -> s #

pattern Unwrapped :: Rewrapped t t => t -> Unwrapped t #

type family Unwrapped s #

Instances

Instances details

type Unwrapped NoMethodError
Instance details Defined in Control.Lens.Wrapped type Unwrapped NoMethodError = String
type Unwrapped PatternMatchFail
Instance details Defined in Control.Lens.Wrapped type Unwrapped PatternMatchFail = String
type Unwrapped RecConError
Instance details Defined in Control.Lens.Wrapped type Unwrapped RecConError = String
type Unwrapped RecSelError
Instance details Defined in Control.Lens.Wrapped type Unwrapped RecSelError = String
type Unwrapped RecUpdError
Instance details Defined in Control.Lens.Wrapped type Unwrapped RecUpdError = String
type Unwrapped TypeError
Instance details Defined in Control.Lens.Wrapped type Unwrapped TypeError = String
type Unwrapped All
Instance details Defined in Control.Lens.Wrapped type Unwrapped All = Bool
type Unwrapped Any
Instance details Defined in Control.Lens.Wrapped type Unwrapped Any = Bool
type Unwrapped Errno
Instance details Defined in Control.Lens.Wrapped type Unwrapped Errno = CInt
type Unwrapped CBool
Instance details Defined in Control.Lens.Wrapped type Unwrapped CBool = Word8
type Unwrapped CChar
Instance details Defined in Control.Lens.Wrapped type Unwrapped CChar = Int8
type Unwrapped CClock
Instance details Defined in Control.Lens.Wrapped type Unwrapped CClock = Int64
type Unwrapped CDouble
Instance details Defined in Control.Lens.Wrapped type Unwrapped CDouble = Double
type Unwrapped CFloat
Instance details Defined in Control.Lens.Wrapped type Unwrapped CFloat = Float
type Unwrapped CInt
Instance details Defined in Control.Lens.Wrapped type Unwrapped CInt = Int32
type Unwrapped CIntMax
Instance details Defined in Control.Lens.Wrapped type Unwrapped CIntMax = Int64
type Unwrapped CIntPtr
Instance details Defined in Control.Lens.Wrapped type Unwrapped CIntPtr = Int64
type Unwrapped CLLong
Instance details Defined in Control.Lens.Wrapped type Unwrapped CLLong = Int64
type Unwrapped CLong
Instance details Defined in Control.Lens.Wrapped type Unwrapped CLong = Int64
type Unwrapped CPtrdiff
Instance details Defined in Control.Lens.Wrapped type Unwrapped CPtrdiff = Int64
type Unwrapped CSChar
Instance details Defined in Control.Lens.Wrapped type Unwrapped CSChar = Int8
type Unwrapped CSUSeconds
Instance details Defined in Control.Lens.Wrapped type Unwrapped CSUSeconds = Int64
type Unwrapped CShort
Instance details Defined in Control.Lens.Wrapped type Unwrapped CShort = Int16
type Unwrapped CSigAtomic
Instance details Defined in Control.Lens.Wrapped type Unwrapped CSigAtomic = Int32
type Unwrapped CSize
Instance details Defined in Control.Lens.Wrapped type Unwrapped CSize = Word64
type Unwrapped CTime
Instance details Defined in Control.Lens.Wrapped type Unwrapped CTime = Int64
type Unwrapped CUChar
Instance details Defined in Control.Lens.Wrapped type Unwrapped CUChar = Word8
type Unwrapped CUInt
Instance details Defined in Control.Lens.Wrapped type Unwrapped CUInt = Word32
type Unwrapped CUIntMax
Instance details Defined in Control.Lens.Wrapped type Unwrapped CUIntMax = Word64
type Unwrapped CUIntPtr
Instance details Defined in Control.Lens.Wrapped type Unwrapped CUIntPtr = Word64
type Unwrapped CULLong
Instance details Defined in Control.Lens.Wrapped type Unwrapped CULLong = Word64
type Unwrapped CULong
Instance details Defined in Control.Lens.Wrapped type Unwrapped CULong = Word64
type Unwrapped CUSeconds
Instance details Defined in Control.Lens.Wrapped type Unwrapped CUSeconds = Word32
type Unwrapped CUShort
Instance details Defined in Control.Lens.Wrapped type Unwrapped CUShort = Word16
type Unwrapped CWchar
Instance details Defined in Control.Lens.Wrapped type Unwrapped CWchar = Int32
type Unwrapped ErrorCall
Instance details Defined in Control.Lens.Wrapped type Unwrapped ErrorCall = String
type Unwrapped AssertionFailed
Instance details Defined in Control.Lens.Wrapped type Unwrapped AssertionFailed = String
type Unwrapped CompactionFailed
Instance details Defined in Control.Lens.Wrapped type Unwrapped CompactionFailed = String
type Unwrapped CBlkCnt
Instance details Defined in Control.Lens.Wrapped type Unwrapped CBlkCnt = Int64
type Unwrapped CBlkSize
Instance details Defined in Control.Lens.Wrapped type Unwrapped CBlkSize = Int64
type Unwrapped CCc
Instance details Defined in Control.Lens.Wrapped type Unwrapped CCc = Word8
type Unwrapped CClockId
Instance details Defined in Control.Lens.Wrapped type Unwrapped CClockId = Int32
type Unwrapped CDev
Instance details Defined in Control.Lens.Wrapped type Unwrapped CDev = Word64
type Unwrapped CFsBlkCnt
Instance details Defined in Control.Lens.Wrapped type Unwrapped CFsBlkCnt = Word64
type Unwrapped CFsFilCnt
Instance details Defined in Control.Lens.Wrapped type Unwrapped CFsFilCnt = Word64
type Unwrapped CGid
Instance details Defined in Control.Lens.Wrapped type Unwrapped CGid = Word32
type Unwrapped CId
Instance details Defined in Control.Lens.Wrapped type Unwrapped CId = Word32
type Unwrapped CIno
Instance details Defined in Control.Lens.Wrapped type Unwrapped CIno = Word64
type Unwrapped CKey
Instance details Defined in Control.Lens.Wrapped type Unwrapped CKey = Int32
type Unwrapped CMode
Instance details Defined in Control.Lens.Wrapped type Unwrapped CMode = Word32
type Unwrapped CNlink
Instance details Defined in Control.Lens.Wrapped type Unwrapped CNlink = Word64
type Unwrapped COff
Instance details Defined in Control.Lens.Wrapped type Unwrapped COff = Int64
type Unwrapped CPid
Instance details Defined in Control.Lens.Wrapped type Unwrapped CPid = Int32
type Unwrapped CRLim
Instance details Defined in Control.Lens.Wrapped type Unwrapped CRLim = Word64
type Unwrapped CSpeed
Instance details Defined in Control.Lens.Wrapped type Unwrapped CSpeed = Word32
type Unwrapped CSsize
Instance details Defined in Control.Lens.Wrapped type Unwrapped CSsize = Int64
type Unwrapped CTcflag
Instance details Defined in Control.Lens.Wrapped type Unwrapped CTcflag = Word32
type Unwrapped CTimer
Instance details Defined in Control.Lens.Wrapped type Unwrapped CTimer = Ptr ()
type Unwrapped CUid
Instance details Defined in Control.Lens.Wrapped type Unwrapped CUid = Word32
type Unwrapped Fd
Instance details Defined in Control.Lens.Wrapped type Unwrapped Fd = CInt
type Unwrapped IntSet
Instance details Defined in Control.Lens.Wrapped type Unwrapped IntSet = [Int]
type Unwrapped Name
Instance details Defined in Diagrams.Core.Names type Unwrapped Name = [AName]
type Unwrapped SegCount Source #
Instance details Defined in Diagrams.Segment type Unwrapped SegCount = Sum Int
type Unwrapped (Active a)
Instance details Defined in Data.Active type Unwrapped (Active a) = MaybeApply Dynamic a
type Unwrapped (Duration n)
Instance details Defined in Data.Active type Unwrapped (Duration n) = n
type Unwrapped (Time n)
Instance details Defined in Data.Active type Unwrapped (Time n) = n
type Unwrapped (ZipList a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (ZipList a) = [a]
type Unwrapped (Comparison a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Comparison a) = a -> a -> Ordering
type Unwrapped (Equivalence a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Equivalence a) = a -> a -> Bool
type Unwrapped (Predicate a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Predicate a) = a -> Bool
type Unwrapped (Identity a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Identity a) = a
type Unwrapped (First a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (First a) = Maybe a
type Unwrapped (Last a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Last a) = Maybe a
type Unwrapped (Down a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Down a) = a
type Unwrapped (First a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (First a) = a
type Unwrapped (Last a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Last a) = a
type Unwrapped (Max a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Max a) = a
type Unwrapped (Min a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Min a) = a
type Unwrapped (WrappedMonoid a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (WrappedMonoid a) = a
type Unwrapped (Dual a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Dual a) = a
type Unwrapped (Endo a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Endo a) = a -> a
type Unwrapped (Product a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Product a) = a
type Unwrapped (Sum a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Sum a) = a
type Unwrapped (Par1 p)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Par1 p) = p
type Unwrapped (IntMap a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (IntMap a) = [(Int, a)]
type Unwrapped (Seq a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Seq a) = [a]
type Unwrapped (Set a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Set a) = [a]
type Unwrapped (TransInv t)
Instance details Defined in Diagrams.Core.Transform type Unwrapped (TransInv t) = t
type Unwrapped (ArcLength n) Source #
Instance details Defined in Diagrams.Segment type Unwrapped (ArcLength n) = (Sum (Interval n), n -> Sum (Interval n))
type Unwrapped (Clip n) Source #
Instance details Defined in Diagrams.TwoD.Path type Unwrapped (Clip n) = [Path V2 n]
type Unwrapped (HashSet a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (HashSet a) = [a]
type Unwrapped (Vector a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Vector a) = [a]
type Unwrapped (Vector a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Vector a) = [a]
type Unwrapped (Vector a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Vector a) = [a]
type Unwrapped (Vector a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Vector a) = [a]
type Unwrapped (NonEmpty a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (NonEmpty a) = (a, [a])
type Unwrapped (WrappedMonad m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (WrappedMonad m a) = m a
type Unwrapped (ArrowMonad m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (ArrowMonad m a) = m () a
type Unwrapped (Op a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Op a b) = b -> a
type Unwrapped (Map k a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Map k a) = [(k, a)]
type Unwrapped (Envelope v n)
Instance details Defined in Diagrams.Core.Envelope type Unwrapped (Envelope v n) = Maybe (v n -> Max n)
type Unwrapped (Style v n)
Instance details Defined in Diagrams.Core.Style type Unwrapped (Style v n) = HashMap TypeRep (Attribute v n)
type Unwrapped (Trace v n)
Instance details Defined in Diagrams.Core.Trace type Unwrapped (Trace v n) = Point v n -> v n -> SortedList n
type Unwrapped (Path v n) Source #
Instance details Defined in Diagrams.Path type Unwrapped (Path v n) = [Located (Trail v n)]
type Unwrapped (TotalOffset v n) Source #
Instance details Defined in Diagrams.Segment type Unwrapped (TotalOffset v n) = v n
type Unwrapped (SegTree v n) Source #
Instance details Defined in Diagrams.Trail type Unwrapped (SegTree v n) = FingerTree (SegMeasure v n) (Segment Closed v n)
type Unwrapped (Trail v n) Source #
Instance details Defined in Diagrams.Trail type Unwrapped (Trail v n) = Either (Trail' Line v n) (Trail' Loop v n)
type Unwrapped (CatchT m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (CatchT m a) = m (Either SomeException a)
type Unwrapped (Alt f a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Alt f a) = [AltF f a]
type Unwrapped (CoiterT w a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (CoiterT w a) = w (a, CoiterT w a)
type Unwrapped (IterT m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (IterT m a) = m (Either a (IterT m a))
type Unwrapped (Point f a)
Instance details Defined in Linear.Affine type Unwrapped (Point f a) = f a
type Unwrapped (MaybeApply f a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (MaybeApply f a) = Either (f a) a
type Unwrapped (WrappedApplicative f a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (WrappedApplicative f a) = f a
type Unwrapped (ListT m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (ListT m a) = m [a]
type Unwrapped (MaybeT m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (MaybeT m a) = m (Maybe a)
type Unwrapped (HashMap k a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (HashMap k a) = [(k, a)]
type Unwrapped (WrappedArrow a b c)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (WrappedArrow a b c) = a b c
type Unwrapped (Kleisli m a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Kleisli m a b) = a -> m b
type Unwrapped (Const a x)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Const a x) = a
type Unwrapped (Ap f a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Ap f a) = f a
type Unwrapped (Alt f a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Alt f a) = f a
type Unwrapped (Rec1 f p)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Rec1 f p) = f p
type Unwrapped (Fix p a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Fix p a) = p (Fix p a) a
type Unwrapped (Join p a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Join p a) = p a a
type Unwrapped (TracedT m w a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (TracedT m w a) = w (m -> a)
type Unwrapped (Compose f g a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Compose f g a) = f (g a)
type Unwrapped (ComposeCF f g a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (ComposeCF f g a) = f (g a)
type Unwrapped (ComposeFC f g a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (ComposeFC f g a) = f (g a)
type Unwrapped (Query v n m)
Instance details Defined in Diagrams.Core.Query type Unwrapped (Query v n m) = Point v n -> m
type Unwrapped (Trail' Line v n) Source #
Instance details Defined in Diagrams.Trail type Unwrapped (Trail' Line v n) = SegTree v n
type Unwrapped (ApT f g a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (ApT f g a) = g (ApF f g a)
type Unwrapped (CofreeT f w a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (CofreeT f w a) = w (CofreeF f a (CofreeT f w a))
type Unwrapped (FreeT f m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (FreeT f m a) = m (FreeF f a (FreeT f m a))
type Unwrapped (Static f a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Static f a b) = f (a -> b)
type Unwrapped (Tagged s a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Tagged s a) = a
type Unwrapped (Backwards f a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Backwards f a) = f a
type Unwrapped (ErrorT e m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (ErrorT e m a) = m (Either e a)
type Unwrapped (ExceptT e m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (ExceptT e m a) = m (Either e a)
type Unwrapped (IdentityT m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (IdentityT m a) = m a
type Unwrapped (ReaderT r m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (ReaderT r m a) = r -> m a
type Unwrapped (StateT s m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (StateT s m a) = s -> m (a, s)
type Unwrapped (StateT s m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (StateT s m a) = s -> m (a, s)
type Unwrapped (WriterT w m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (WriterT w m a) = m (a, w)
type Unwrapped (WriterT w m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (WriterT w m a) = m (a, w)
type Unwrapped (Constant a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Constant a b) = a
type Unwrapped (Reverse f a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Reverse f a) = f a
type Unwrapped (K1 i c p)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (K1 i c p) = c
type Unwrapped (QDiagram b v n m)
Instance details Defined in Diagrams.Core.Types type Unwrapped (QDiagram b v n m) = DUALTree (DownAnnots v n) (UpAnnots b v n m) Annotation (QDiaLeaf b v n m)
type Unwrapped (SubMap b v n m)
Instance details Defined in Diagrams.Core.Types type Unwrapped (SubMap b v n m) = Map Name [Subdiagram b v n m]
type Unwrapped (Costar f d c)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Costar f d c) = f d -> c
type Unwrapped (Forget r a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Forget r a b) = a -> r
type Unwrapped (Star f d c)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Star f d c) = d -> f c
type Unwrapped (ContT r m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (ContT r m a) = (a -> m r) -> m r
type Unwrapped (Compose f g a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Compose f g a) = f (g a)
type Unwrapped ((f :.: g) p)
Instance details Defined in Control.Lens.Wrapped type Unwrapped ((f :.: g) p) = f (g p)
type Unwrapped (M1 i c f p)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (M1 i c f p) = f p
type Unwrapped (Clown f a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Clown f a b) = f a
type Unwrapped (Flip p a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Flip p a b) = p b a
type Unwrapped (Joker g a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Joker g a b) = g b
type Unwrapped (WrappedBifunctor p a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (WrappedBifunctor p a b) = p a b
type Unwrapped (WrappedArrow p a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (WrappedArrow p a b) = p a b
type Unwrapped (Semi m a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Semi m a b) = m
type Unwrapped (WrappedCategory k3 a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (WrappedCategory k3 a b) = k3 a b
type Unwrapped (Dual k3 a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Dual k3 a b) = k3 b a
type Unwrapped (RWST r w s m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (RWST r w s m a) = r -> s -> m (a, s, w)
type Unwrapped (RWST r w s m a)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (RWST r w s m a) = r -> s -> m (a, s, w)
type Unwrapped (Tannen f p a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Tannen f p a b) = f (p a b)
type Unwrapped (Cayley f p a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Cayley f p a b) = f (p a b)
type Unwrapped (Biff p f g a b)
Instance details Defined in Control.Lens.Wrapped type Unwrapped (Biff p f g a b) = p (f a) (g b)

class Wrapped s where #

Wrapped provides isomorphisms to wrap and unwrap newtypes or data types with one constructor.

Minimal complete definition

Nothing

Associated Types

type Unwrapped s #

type Unwrapped s = GUnwrapped (Rep s)

Methods

_Wrapped' :: Iso' s (Unwrapped s) #

An isomorphism between s and a.

If your type has a Generic instance, _Wrapped' will default to _GWrapped', and you can choose to not override it with your own definition.

Instances

Instances details

Wrapped NoMethodError
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped NoMethodError # Methods _Wrapped' :: Iso' NoMethodError (Unwrapped NoMethodError) #
Wrapped PatternMatchFail
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped PatternMatchFail # Methods _Wrapped' :: Iso' PatternMatchFail (Unwrapped PatternMatchFail) #
Wrapped RecConError
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped RecConError # Methods _Wrapped' :: Iso' RecConError (Unwrapped RecConError) #
Wrapped RecSelError
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped RecSelError # Methods _Wrapped' :: Iso' RecSelError (Unwrapped RecSelError) #
Wrapped RecUpdError
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped RecUpdError # Methods _Wrapped' :: Iso' RecUpdError (Unwrapped RecUpdError) #
Wrapped TypeError
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped TypeError # Methods _Wrapped' :: Iso' TypeError (Unwrapped TypeError) #
Wrapped All
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped All # Methods _Wrapped' :: Iso' All (Unwrapped All) #
Wrapped Any
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped Any # Methods _Wrapped' :: Iso' Any (Unwrapped Any) #
Wrapped Errno
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped Errno # Methods _Wrapped' :: Iso' Errno (Unwrapped Errno) #
Wrapped CBool
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CBool # Methods _Wrapped' :: Iso' CBool (Unwrapped CBool) #
Wrapped CChar
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CChar # Methods _Wrapped' :: Iso' CChar (Unwrapped CChar) #
Wrapped CClock
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CClock # Methods _Wrapped' :: Iso' CClock (Unwrapped CClock) #
Wrapped CDouble
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CDouble # Methods _Wrapped' :: Iso' CDouble (Unwrapped CDouble) #
Wrapped CFloat
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CFloat # Methods _Wrapped' :: Iso' CFloat (Unwrapped CFloat) #
Wrapped CInt
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CInt # Methods _Wrapped' :: Iso' CInt (Unwrapped CInt) #
Wrapped CIntMax
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CIntMax # Methods _Wrapped' :: Iso' CIntMax (Unwrapped CIntMax) #
Wrapped CIntPtr
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CIntPtr # Methods _Wrapped' :: Iso' CIntPtr (Unwrapped CIntPtr) #
Wrapped CLLong
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CLLong # Methods _Wrapped' :: Iso' CLLong (Unwrapped CLLong) #
Wrapped CLong
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CLong # Methods _Wrapped' :: Iso' CLong (Unwrapped CLong) #
Wrapped CPtrdiff
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CPtrdiff # Methods _Wrapped' :: Iso' CPtrdiff (Unwrapped CPtrdiff) #
Wrapped CSChar
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CSChar # Methods _Wrapped' :: Iso' CSChar (Unwrapped CSChar) #
Wrapped CSUSeconds
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CSUSeconds # Methods _Wrapped' :: Iso' CSUSeconds (Unwrapped CSUSeconds) #
Wrapped CShort
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CShort # Methods _Wrapped' :: Iso' CShort (Unwrapped CShort) #
Wrapped CSigAtomic
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CSigAtomic # Methods _Wrapped' :: Iso' CSigAtomic (Unwrapped CSigAtomic) #
Wrapped CSize
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CSize # Methods _Wrapped' :: Iso' CSize (Unwrapped CSize) #
Wrapped CTime
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CTime # Methods _Wrapped' :: Iso' CTime (Unwrapped CTime) #
Wrapped CUChar
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CUChar # Methods _Wrapped' :: Iso' CUChar (Unwrapped CUChar) #
Wrapped CUInt
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CUInt # Methods _Wrapped' :: Iso' CUInt (Unwrapped CUInt) #
Wrapped CUIntMax
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CUIntMax # Methods _Wrapped' :: Iso' CUIntMax (Unwrapped CUIntMax) #
Wrapped CUIntPtr
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CUIntPtr # Methods _Wrapped' :: Iso' CUIntPtr (Unwrapped CUIntPtr) #
Wrapped CULLong
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CULLong # Methods _Wrapped' :: Iso' CULLong (Unwrapped CULLong) #
Wrapped CULong
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CULong # Methods _Wrapped' :: Iso' CULong (Unwrapped CULong) #
Wrapped CUSeconds
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CUSeconds # Methods _Wrapped' :: Iso' CUSeconds (Unwrapped CUSeconds) #
Wrapped CUShort
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CUShort # Methods _Wrapped' :: Iso' CUShort (Unwrapped CUShort) #
Wrapped CWchar
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CWchar # Methods _Wrapped' :: Iso' CWchar (Unwrapped CWchar) #
Wrapped ErrorCall
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped ErrorCall # Methods _Wrapped' :: Iso' ErrorCall (Unwrapped ErrorCall) #
Wrapped AssertionFailed
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped AssertionFailed # Methods _Wrapped' :: Iso' AssertionFailed (Unwrapped AssertionFailed) #
Wrapped CompactionFailed
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CompactionFailed # Methods _Wrapped' :: Iso' CompactionFailed (Unwrapped CompactionFailed) #
Wrapped CBlkCnt
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CBlkCnt # Methods _Wrapped' :: Iso' CBlkCnt (Unwrapped CBlkCnt) #
Wrapped CBlkSize
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CBlkSize # Methods _Wrapped' :: Iso' CBlkSize (Unwrapped CBlkSize) #
Wrapped CCc
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CCc # Methods _Wrapped' :: Iso' CCc (Unwrapped CCc) #
Wrapped CClockId
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CClockId # Methods _Wrapped' :: Iso' CClockId (Unwrapped CClockId) #
Wrapped CDev
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CDev # Methods _Wrapped' :: Iso' CDev (Unwrapped CDev) #
Wrapped CFsBlkCnt
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CFsBlkCnt # Methods _Wrapped' :: Iso' CFsBlkCnt (Unwrapped CFsBlkCnt) #
Wrapped CFsFilCnt
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CFsFilCnt # Methods _Wrapped' :: Iso' CFsFilCnt (Unwrapped CFsFilCnt) #
Wrapped CGid
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CGid # Methods _Wrapped' :: Iso' CGid (Unwrapped CGid) #
Wrapped CId
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CId # Methods _Wrapped' :: Iso' CId (Unwrapped CId) #
Wrapped CIno
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CIno # Methods _Wrapped' :: Iso' CIno (Unwrapped CIno) #
Wrapped CKey
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CKey # Methods _Wrapped' :: Iso' CKey (Unwrapped CKey) #
Wrapped CMode
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CMode # Methods _Wrapped' :: Iso' CMode (Unwrapped CMode) #
Wrapped CNlink
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CNlink # Methods _Wrapped' :: Iso' CNlink (Unwrapped CNlink) #
Wrapped COff
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped COff # Methods _Wrapped' :: Iso' COff (Unwrapped COff) #
Wrapped CPid
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CPid # Methods _Wrapped' :: Iso' CPid (Unwrapped CPid) #
Wrapped CRLim
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CRLim # Methods _Wrapped' :: Iso' CRLim (Unwrapped CRLim) #
Wrapped CSpeed
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CSpeed # Methods _Wrapped' :: Iso' CSpeed (Unwrapped CSpeed) #
Wrapped CSsize
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CSsize # Methods _Wrapped' :: Iso' CSsize (Unwrapped CSsize) #
Wrapped CTcflag
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CTcflag # Methods _Wrapped' :: Iso' CTcflag (Unwrapped CTcflag) #
Wrapped CTimer
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CTimer # Methods _Wrapped' :: Iso' CTimer (Unwrapped CTimer) #
Wrapped CUid
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped CUid # Methods _Wrapped' :: Iso' CUid (Unwrapped CUid) #
Wrapped Fd
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped Fd # Methods _Wrapped' :: Iso' Fd (Unwrapped Fd) #
Wrapped IntSet
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped IntSet # Methods _Wrapped' :: Iso' IntSet (Unwrapped IntSet) #
Wrapped Name
Instance details Defined in Diagrams.Core.Names Associated Types type Unwrapped Name # Methods _Wrapped' :: Iso' Name (Unwrapped Name) #
Wrapped SegCount Source #
Instance details Defined in Diagrams.Segment Associated Types type Unwrapped SegCount # Methods _Wrapped' :: Iso' SegCount (Unwrapped SegCount) #
Wrapped (Active a)
Instance details Defined in Data.Active Associated Types type Unwrapped (Active a) # Methods _Wrapped' :: Iso' (Active a) (Unwrapped (Active a)) #
Wrapped (Duration n)
Instance details Defined in Data.Active Associated Types type Unwrapped (Duration n) # Methods _Wrapped' :: Iso' (Duration n) (Unwrapped (Duration n)) #
Wrapped (Time n)
Instance details Defined in Data.Active Associated Types type Unwrapped (Time n) # Methods _Wrapped' :: Iso' (Time n) (Unwrapped (Time n)) #
Wrapped (ZipList a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (ZipList a) # Methods _Wrapped' :: Iso' (ZipList a) (Unwrapped (ZipList a)) #
Wrapped (Comparison a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Comparison a) # Methods _Wrapped' :: Iso' (Comparison a) (Unwrapped (Comparison a)) #
Wrapped (Equivalence a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Equivalence a) # Methods _Wrapped' :: Iso' (Equivalence a) (Unwrapped (Equivalence a)) #
Wrapped (Predicate a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Predicate a) # Methods _Wrapped' :: Iso' (Predicate a) (Unwrapped (Predicate a)) #
Wrapped (Identity a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Identity a) # Methods _Wrapped' :: Iso' (Identity a) (Unwrapped (Identity a)) #
Wrapped (First a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (First a) # Methods _Wrapped' :: Iso' (First a) (Unwrapped (First a)) #
Wrapped (Last a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Last a) # Methods _Wrapped' :: Iso' (Last a) (Unwrapped (Last a)) #
Wrapped (Down a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Down a) # Methods _Wrapped' :: Iso' (Down a) (Unwrapped (Down a)) #
Wrapped (First a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (First a) # Methods _Wrapped' :: Iso' (First a) (Unwrapped (First a)) #
Wrapped (Last a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Last a) # Methods _Wrapped' :: Iso' (Last a) (Unwrapped (Last a)) #
Wrapped (Max a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Max a) # Methods _Wrapped' :: Iso' (Max a) (Unwrapped (Max a)) #
Wrapped (Min a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Min a) # Methods _Wrapped' :: Iso' (Min a) (Unwrapped (Min a)) #
Wrapped (WrappedMonoid a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (WrappedMonoid a) # Methods _Wrapped' :: Iso' (WrappedMonoid a) (Unwrapped (WrappedMonoid a)) #
Wrapped (Dual a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Dual a) # Methods _Wrapped' :: Iso' (Dual a) (Unwrapped (Dual a)) #
Wrapped (Endo a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Endo a) # Methods _Wrapped' :: Iso' (Endo a) (Unwrapped (Endo a)) #
Wrapped (Product a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Product a) # Methods _Wrapped' :: Iso' (Product a) (Unwrapped (Product a)) #
Wrapped (Sum a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Sum a) # Methods _Wrapped' :: Iso' (Sum a) (Unwrapped (Sum a)) #
Wrapped (Par1 p)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Par1 p) # Methods _Wrapped' :: Iso' (Par1 p) (Unwrapped (Par1 p)) #
Wrapped (IntMap a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (IntMap a) # Methods _Wrapped' :: Iso' (IntMap a) (Unwrapped (IntMap a)) #
Wrapped (Seq a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Seq a) # Methods _Wrapped' :: Iso' (Seq a) (Unwrapped (Seq a)) #
Ord a => Wrapped (Set a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Set a) # Methods _Wrapped' :: Iso' (Set a) (Unwrapped (Set a)) #
Wrapped (TransInv t)
Instance details Defined in Diagrams.Core.Transform Associated Types type Unwrapped (TransInv t) # Methods _Wrapped' :: Iso' (TransInv t) (Unwrapped (TransInv t)) #
Wrapped (ArcLength n) Source #
Instance details Defined in Diagrams.Segment Associated Types type Unwrapped (ArcLength n) # Methods _Wrapped' :: Iso' (ArcLength n) (Unwrapped (ArcLength n)) #
Wrapped (Clip n) Source #
Instance details Defined in Diagrams.TwoD.Path Associated Types type Unwrapped (Clip n) # Methods _Wrapped' :: Iso' (Clip n) (Unwrapped (Clip n)) #
(Hashable a, Eq a) => Wrapped (HashSet a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (HashSet a) # Methods _Wrapped' :: Iso' (HashSet a) (Unwrapped (HashSet a)) #
Wrapped (Vector a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Vector a) # Methods _Wrapped' :: Iso' (Vector a) (Unwrapped (Vector a)) #
Prim a => Wrapped (Vector a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Vector a) # Methods _Wrapped' :: Iso' (Vector a) (Unwrapped (Vector a)) #
Storable a => Wrapped (Vector a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Vector a) # Methods _Wrapped' :: Iso' (Vector a) (Unwrapped (Vector a)) #
Unbox a => Wrapped (Vector a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Vector a) # Methods _Wrapped' :: Iso' (Vector a) (Unwrapped (Vector a)) #
Wrapped (NonEmpty a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (NonEmpty a) # Methods _Wrapped' :: Iso' (NonEmpty a) (Unwrapped (NonEmpty a)) #
Wrapped (WrappedMonad m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (WrappedMonad m a) # Methods _Wrapped' :: Iso' (WrappedMonad m a) (Unwrapped (WrappedMonad m a)) #
Wrapped (ArrowMonad m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (ArrowMonad m a) # Methods _Wrapped' :: Iso' (ArrowMonad m a) (Unwrapped (ArrowMonad m a)) #
Wrapped (Op a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Op a b) # Methods _Wrapped' :: Iso' (Op a b) (Unwrapped (Op a b)) #
Ord k => Wrapped (Map k a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Map k a) # Methods _Wrapped' :: Iso' (Map k a) (Unwrapped (Map k a)) #
Wrapped (Envelope v n)
Instance details Defined in Diagrams.Core.Envelope Associated Types type Unwrapped (Envelope v n) # Methods _Wrapped' :: Iso' (Envelope v n) (Unwrapped (Envelope v n)) #
Wrapped (Style v n)
Instance details Defined in Diagrams.Core.Style Associated Types type Unwrapped (Style v n) # Methods _Wrapped' :: Iso' (Style v n) (Unwrapped (Style v n)) #
Wrapped (Trace v n)
Instance details Defined in Diagrams.Core.Trace Associated Types type Unwrapped (Trace v n) # Methods _Wrapped' :: Iso' (Trace v n) (Unwrapped (Trace v n)) #
Wrapped (Path v n) Source #
Instance details Defined in Diagrams.Path Associated Types type Unwrapped (Path v n) # Methods _Wrapped' :: Iso' (Path v n) (Unwrapped (Path v n)) #
Wrapped (TotalOffset v n) Source #
Instance details Defined in Diagrams.Segment Associated Types type Unwrapped (TotalOffset v n) # Methods _Wrapped' :: Iso' (TotalOffset v n) (Unwrapped (TotalOffset v n)) #
Wrapped (SegTree v n) Source #
Instance details Defined in Diagrams.Trail Associated Types type Unwrapped (SegTree v n) # Methods _Wrapped' :: Iso' (SegTree v n) (Unwrapped (SegTree v n)) #
Wrapped (Trail v n) Source #
Instance details Defined in Diagrams.Trail Associated Types type Unwrapped (Trail v n) # Methods _Wrapped' :: Iso' (Trail v n) (Unwrapped (Trail v n)) #
Wrapped (CatchT m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (CatchT m a) # Methods _Wrapped' :: Iso' (CatchT m a) (Unwrapped (CatchT m a)) #
Wrapped (Alt f a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Alt f a) # Methods _Wrapped' :: Iso' (Alt f a) (Unwrapped (Alt f a)) #
Wrapped (CoiterT w a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (CoiterT w a) # Methods _Wrapped' :: Iso' (CoiterT w a) (Unwrapped (CoiterT w a)) #
Wrapped (IterT m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (IterT m a) # Methods _Wrapped' :: Iso' (IterT m a) (Unwrapped (IterT m a)) #
Wrapped (Point f a)
Instance details Defined in Linear.Affine Associated Types type Unwrapped (Point f a) # Methods _Wrapped' :: Iso' (Point f a) (Unwrapped (Point f a)) #
Wrapped (MaybeApply f a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (MaybeApply f a) # Methods _Wrapped' :: Iso' (MaybeApply f a) (Unwrapped (MaybeApply f a)) #
Wrapped (WrappedApplicative f a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (WrappedApplicative f a) # Methods _Wrapped' :: Iso' (WrappedApplicative f a) (Unwrapped (WrappedApplicative f a)) #
Wrapped (ListT m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (ListT m a) # Methods _Wrapped' :: Iso' (ListT m a) (Unwrapped (ListT m a)) #
Wrapped (MaybeT m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (MaybeT m a) # Methods _Wrapped' :: Iso' (MaybeT m a) (Unwrapped (MaybeT m a)) #
(Hashable k, Eq k) => Wrapped (HashMap k a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (HashMap k a) # Methods _Wrapped' :: Iso' (HashMap k a) (Unwrapped (HashMap k a)) #
Wrapped (WrappedArrow a b c)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (WrappedArrow a b c) # Methods _Wrapped' :: Iso' (WrappedArrow a b c) (Unwrapped (WrappedArrow a b c)) #
Wrapped (Kleisli m a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Kleisli m a b) # Methods _Wrapped' :: Iso' (Kleisli m a b) (Unwrapped (Kleisli m a b)) #
Wrapped (Const a x)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Const a x) # Methods _Wrapped' :: Iso' (Const a x) (Unwrapped (Const a x)) #
Wrapped (Ap f a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Ap f a) # Methods _Wrapped' :: Iso' (Ap f a) (Unwrapped (Ap f a)) #
Wrapped (Alt f a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Alt f a) # Methods _Wrapped' :: Iso' (Alt f a) (Unwrapped (Alt f a)) #
Wrapped (Rec1 f p)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Rec1 f p) # Methods _Wrapped' :: Iso' (Rec1 f p) (Unwrapped (Rec1 f p)) #
Wrapped (Fix p a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Fix p a) # Methods _Wrapped' :: Iso' (Fix p a) (Unwrapped (Fix p a)) #
Wrapped (Join p a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Join p a) # Methods _Wrapped' :: Iso' (Join p a) (Unwrapped (Join p a)) #
Wrapped (TracedT m w a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (TracedT m w a) # Methods _Wrapped' :: Iso' (TracedT m w a) (Unwrapped (TracedT m w a)) #
Wrapped (Compose f g a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Compose f g a) # Methods _Wrapped' :: Iso' (Compose f g a) (Unwrapped (Compose f g a)) #
Wrapped (ComposeCF f g a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (ComposeCF f g a) # Methods _Wrapped' :: Iso' (ComposeCF f g a) (Unwrapped (ComposeCF f g a)) #
Wrapped (ComposeFC f g a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (ComposeFC f g a) # Methods _Wrapped' :: Iso' (ComposeFC f g a) (Unwrapped (ComposeFC f g a)) #
Wrapped (Query v n m)
Instance details Defined in Diagrams.Core.Query Associated Types type Unwrapped (Query v n m) # Methods _Wrapped' :: Iso' (Query v n m) (Unwrapped (Query v n m)) #
Wrapped (Trail' Line v n) Source #
Instance details Defined in Diagrams.Trail Associated Types type Unwrapped (Trail' Line v n) # Methods _Wrapped' :: Iso' (Trail' Line v n) (Unwrapped (Trail' Line v n)) #
Wrapped (ApT f g a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (ApT f g a) # Methods _Wrapped' :: Iso' (ApT f g a) (Unwrapped (ApT f g a)) #
Wrapped (CofreeT f w a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (CofreeT f w a) # Methods _Wrapped' :: Iso' (CofreeT f w a) (Unwrapped (CofreeT f w a)) #
Wrapped (FreeT f m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (FreeT f m a) # Methods _Wrapped' :: Iso' (FreeT f m a) (Unwrapped (FreeT f m a)) #
Wrapped (Static f a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Static f a b) # Methods _Wrapped' :: Iso' (Static f a b) (Unwrapped (Static f a b)) #
Wrapped (Tagged s a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Tagged s a) # Methods _Wrapped' :: Iso' (Tagged s a) (Unwrapped (Tagged s a)) #
Wrapped (Backwards f a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Backwards f a) # Methods _Wrapped' :: Iso' (Backwards f a) (Unwrapped (Backwards f a)) #
Wrapped (ErrorT e m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (ErrorT e m a) # Methods _Wrapped' :: Iso' (ErrorT e m a) (Unwrapped (ErrorT e m a)) #
Wrapped (ExceptT e m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (ExceptT e m a) # Methods _Wrapped' :: Iso' (ExceptT e m a) (Unwrapped (ExceptT e m a)) #
Wrapped (IdentityT m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (IdentityT m a) # Methods _Wrapped' :: Iso' (IdentityT m a) (Unwrapped (IdentityT m a)) #
Wrapped (ReaderT r m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (ReaderT r m a) # Methods _Wrapped' :: Iso' (ReaderT r m a) (Unwrapped (ReaderT r m a)) #
Wrapped (StateT s m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (StateT s m a) # Methods _Wrapped' :: Iso' (StateT s m a) (Unwrapped (StateT s m a)) #
Wrapped (StateT s m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (StateT s m a) # Methods _Wrapped' :: Iso' (StateT s m a) (Unwrapped (StateT s m a)) #
Wrapped (WriterT w m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (WriterT w m a) # Methods _Wrapped' :: Iso' (WriterT w m a) (Unwrapped (WriterT w m a)) #
Wrapped (WriterT w m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (WriterT w m a) # Methods _Wrapped' :: Iso' (WriterT w m a) (Unwrapped (WriterT w m a)) #
Wrapped (Constant a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Constant a b) # Methods _Wrapped' :: Iso' (Constant a b) (Unwrapped (Constant a b)) #
Wrapped (Reverse f a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Reverse f a) # Methods _Wrapped' :: Iso' (Reverse f a) (Unwrapped (Reverse f a)) #
Wrapped (K1 i c p)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (K1 i c p) # Methods _Wrapped' :: Iso' (K1 i c p) (Unwrapped (K1 i c p)) #
Wrapped (QDiagram b v n m)
Instance details Defined in Diagrams.Core.Types Associated Types type Unwrapped (QDiagram b v n m) # Methods _Wrapped' :: Iso' (QDiagram b v n m) (Unwrapped (QDiagram b v n m)) #
Wrapped (SubMap b v n m)
Instance details Defined in Diagrams.Core.Types Associated Types type Unwrapped (SubMap b v n m) # Methods _Wrapped' :: Iso' (SubMap b v n m) (Unwrapped (SubMap b v n m)) #
Wrapped (Costar f d c)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Costar f d c) # Methods _Wrapped' :: Iso' (Costar f d c) (Unwrapped (Costar f d c)) #
Wrapped (Forget r a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Forget r a b) # Methods _Wrapped' :: Iso' (Forget r a b) (Unwrapped (Forget r a b)) #
Wrapped (Star f d c)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Star f d c) # Methods _Wrapped' :: Iso' (Star f d c) (Unwrapped (Star f d c)) #
Wrapped (ContT r m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (ContT r m a) # Methods _Wrapped' :: Iso' (ContT r m a) (Unwrapped (ContT r m a)) #
Wrapped (Compose f g a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Compose f g a) # Methods _Wrapped' :: Iso' (Compose f g a) (Unwrapped (Compose f g a)) #
Wrapped ((f :.: g) p)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped ((f :.: g) p) # Methods _Wrapped' :: Iso' ((f :.: g) p) (Unwrapped ((f :.: g) p)) #
Wrapped (M1 i c f p)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (M1 i c f p) # Methods _Wrapped' :: Iso' (M1 i c f p) (Unwrapped (M1 i c f p)) #
Wrapped (Clown f a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Clown f a b) # Methods _Wrapped' :: Iso' (Clown f a b) (Unwrapped (Clown f a b)) #
Wrapped (Flip p a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Flip p a b) # Methods _Wrapped' :: Iso' (Flip p a b) (Unwrapped (Flip p a b)) #
Wrapped (Joker g a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Joker g a b) # Methods _Wrapped' :: Iso' (Joker g a b) (Unwrapped (Joker g a b)) #
Wrapped (WrappedBifunctor p a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (WrappedBifunctor p a b) # Methods _Wrapped' :: Iso' (WrappedBifunctor p a b) (Unwrapped (WrappedBifunctor p a b)) #
Wrapped (WrappedArrow p a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (WrappedArrow p a b) # Methods _Wrapped' :: Iso' (WrappedArrow p a b) (Unwrapped (WrappedArrow p a b)) #
Wrapped (Semi m a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Semi m a b) # Methods _Wrapped' :: Iso' (Semi m a b) (Unwrapped (Semi m a b)) #
Wrapped (WrappedCategory k3 a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (WrappedCategory k3 a b) # Methods _Wrapped' :: Iso' (WrappedCategory k3 a b) (Unwrapped (WrappedCategory k3 a b)) #
Wrapped (Dual k3 a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Dual k3 a b) # Methods _Wrapped' :: Iso' (Dual k3 a b) (Unwrapped (Dual k3 a b)) #
Wrapped (RWST r w s m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (RWST r w s m a) # Methods _Wrapped' :: Iso' (RWST r w s m a) (Unwrapped (RWST r w s m a)) #
Wrapped (RWST r w s m a)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (RWST r w s m a) # Methods _Wrapped' :: Iso' (RWST r w s m a) (Unwrapped (RWST r w s m a)) #
Wrapped (Tannen f p a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Tannen f p a b) # Methods _Wrapped' :: Iso' (Tannen f p a b) (Unwrapped (Tannen f p a b)) #
Wrapped (Cayley f p a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Cayley f p a b) # Methods _Wrapped' :: Iso' (Cayley f p a b) (Unwrapped (Cayley f p a b)) #
Wrapped (Biff p f g a b)
Instance details Defined in Control.Lens.Wrapped Associated Types type Unwrapped (Biff p f g a b) # Methods _Wrapped' :: Iso' (Biff p f g a b) (Unwrapped (Biff p f g a b)) #

class Wrapped s => Rewrapped s t #

Instances

Instances details

t ~ NoMethodError => Rewrapped NoMethodError t
Instance details Defined in Control.Lens.Wrapped
t ~ PatternMatchFail => Rewrapped PatternMatchFail t
Instance details Defined in Control.Lens.Wrapped
t ~ RecConError => Rewrapped RecConError t
Instance details Defined in Control.Lens.Wrapped
t ~ RecSelError => Rewrapped RecSelError t
Instance details Defined in Control.Lens.Wrapped
t ~ RecUpdError => Rewrapped RecUpdError t
Instance details Defined in Control.Lens.Wrapped
t ~ TypeError => Rewrapped TypeError t
Instance details Defined in Control.Lens.Wrapped
t ~ All => Rewrapped All t
Instance details Defined in Control.Lens.Wrapped
t ~ Any => Rewrapped Any t
Instance details Defined in Control.Lens.Wrapped
Rewrapped Errno t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CBool t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CChar t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CClock t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CDouble t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CFloat t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CInt t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CIntMax t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CIntPtr t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CLLong t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CLong t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CPtrdiff t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CSChar t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CSUSeconds t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CShort t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CSigAtomic t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CSize t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CTime t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CUChar t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CUInt t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CUIntMax t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CUIntPtr t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CULLong t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CULong t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CUSeconds t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CUShort t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CWchar t
Instance details Defined in Control.Lens.Wrapped
t ~ ErrorCall => Rewrapped ErrorCall t
Instance details Defined in Control.Lens.Wrapped
t ~ AssertionFailed => Rewrapped AssertionFailed t
Instance details Defined in Control.Lens.Wrapped
t ~ CompactionFailed => Rewrapped CompactionFailed t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CBlkCnt t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CBlkSize t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CCc t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CClockId t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CDev t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CFsBlkCnt t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CFsFilCnt t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CGid t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CId t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CIno t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CKey t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CMode t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CNlink t
Instance details Defined in Control.Lens.Wrapped
Rewrapped COff t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CPid t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CRLim t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CSpeed t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CSsize t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CTcflag t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CTimer t
Instance details Defined in Control.Lens.Wrapped
Rewrapped CUid t
Instance details Defined in Control.Lens.Wrapped
Rewrapped Fd t
Instance details Defined in Control.Lens.Wrapped
t ~ IntSet => Rewrapped IntSet t	Use `wrapping fromList`. unwrapping returns a sorted list.
Instance details Defined in Control.Lens.Wrapped
Rewrapped Name Name
Instance details Defined in Diagrams.Core.Names
Rewrapped SegCount SegCount Source #
Instance details Defined in Diagrams.Segment
Active a1 ~ t => Rewrapped (Active a2) t
Instance details Defined in Data.Active
Duration n1 ~ t => Rewrapped (Duration n2) t
Instance details Defined in Data.Active
Time n1 ~ t => Rewrapped (Time n2) t
Instance details Defined in Data.Active
t ~ ZipList b => Rewrapped (ZipList a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Comparison b => Rewrapped (Comparison a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Equivalence b => Rewrapped (Equivalence a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Predicate b => Rewrapped (Predicate a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Identity b => Rewrapped (Identity a) t
Instance details Defined in Control.Lens.Wrapped
t ~ First b => Rewrapped (First a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Last b => Rewrapped (Last a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Down b => Rewrapped (Down a) t
Instance details Defined in Control.Lens.Wrapped
t ~ First b => Rewrapped (First a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Last b => Rewrapped (Last a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Max b => Rewrapped (Max a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Min b => Rewrapped (Min a) t
Instance details Defined in Control.Lens.Wrapped
t ~ WrappedMonoid b => Rewrapped (WrappedMonoid a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Dual b => Rewrapped (Dual a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Endo b => Rewrapped (Endo a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Product b => Rewrapped (Product a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Sum b => Rewrapped (Sum a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Par1 p' => Rewrapped (Par1 p) t
Instance details Defined in Control.Lens.Wrapped
t ~ IntMap a' => Rewrapped (IntMap a) t	Use `wrapping fromList`. unwrapping returns a sorted list.
Instance details Defined in Control.Lens.Wrapped
t ~ Seq a' => Rewrapped (Seq a) t
Instance details Defined in Control.Lens.Wrapped
(t ~ Set a', Ord a) => Rewrapped (Set a) t	Use `wrapping fromList`. unwrapping returns a sorted list.
Instance details Defined in Control.Lens.Wrapped
Clip n1 ~ t => Rewrapped (Clip n2) t Source #
Instance details Defined in Diagrams.TwoD.Path
(t ~ HashSet a', Hashable a, Eq a) => Rewrapped (HashSet a) t	Use `wrapping fromList`. Unwrapping returns some permutation of the list.
Instance details Defined in Control.Lens.Wrapped
t ~ Vector a' => Rewrapped (Vector a) t
Instance details Defined in Control.Lens.Wrapped
(Prim a, t ~ Vector a') => Rewrapped (Vector a) t
Instance details Defined in Control.Lens.Wrapped
(Storable a, t ~ Vector a') => Rewrapped (Vector a) t
Instance details Defined in Control.Lens.Wrapped
(Unbox a, t ~ Vector a') => Rewrapped (Vector a) t
Instance details Defined in Control.Lens.Wrapped
t ~ NonEmpty b => Rewrapped (NonEmpty a) t
Instance details Defined in Control.Lens.Wrapped
Rewrapped (TransInv t) (TransInv t')
Instance details Defined in Diagrams.Core.Transform
Rewrapped (ArcLength n) (ArcLength n') Source #
Instance details Defined in Diagrams.Segment
t ~ WrappedMonad m' a' => Rewrapped (WrappedMonad m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ ArrowMonad m' a' => Rewrapped (ArrowMonad m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Op a' b' => Rewrapped (Op a b) t
Instance details Defined in Control.Lens.Wrapped
(t ~ Map k' a', Ord k) => Rewrapped (Map k a) t	Use `wrapping fromList`. unwrapping returns a sorted list.
Instance details Defined in Control.Lens.Wrapped
t ~ CatchT m' a' => Rewrapped (CatchT m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Alt f' a' => Rewrapped (Alt f a) t
Instance details Defined in Control.Lens.Wrapped
t ~ CoiterT w' a' => Rewrapped (CoiterT w a) t
Instance details Defined in Control.Lens.Wrapped
t ~ IterT m' a' => Rewrapped (IterT m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Point g b => Rewrapped (Point f a) t
Instance details Defined in Linear.Affine
t ~ MaybeApply f' a' => Rewrapped (MaybeApply f a) t
Instance details Defined in Control.Lens.Wrapped
t ~ WrappedApplicative f' a' => Rewrapped (WrappedApplicative f a) t
Instance details Defined in Control.Lens.Wrapped
t ~ ListT n b => Rewrapped (ListT m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ MaybeT n b => Rewrapped (MaybeT m a) t
Instance details Defined in Control.Lens.Wrapped
(t ~ HashMap k' a', Hashable k, Eq k) => Rewrapped (HashMap k a) t	Use `wrapping fromList`. Unwrapping returns some permutation of the list.
Instance details Defined in Control.Lens.Wrapped
Rewrapped (Envelope v n) (Envelope v' n')
Instance details Defined in Diagrams.Core.Envelope
Rewrapped (Style v n) (Style v' n')
Instance details Defined in Diagrams.Core.Style
Rewrapped (Trace v n) (Trace v' n')
Instance details Defined in Diagrams.Core.Trace
Rewrapped (Path v n) (Path v' n') Source #
Instance details Defined in Diagrams.Path
Rewrapped (TotalOffset v n) (TotalOffset v' n') Source #
Instance details Defined in Diagrams.Segment
Rewrapped (SegTree v n) (SegTree v' n') Source #
Instance details Defined in Diagrams.Trail
Rewrapped (Trail v n) (Trail v' n') Source #
Instance details Defined in Diagrams.Trail
t ~ WrappedArrow a' b' c' => Rewrapped (WrappedArrow a b c) t
Instance details Defined in Control.Lens.Wrapped
t ~ Kleisli m' a' b' => Rewrapped (Kleisli m a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ Const a' x' => Rewrapped (Const a x) t
Instance details Defined in Control.Lens.Wrapped
t ~ Ap g b => Rewrapped (Ap f a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Alt g b => Rewrapped (Alt f a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Rec1 f' p' => Rewrapped (Rec1 f p) t
Instance details Defined in Control.Lens.Wrapped
t ~ Fix p' a' => Rewrapped (Fix p a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Join p' a' => Rewrapped (Join p a) t
Instance details Defined in Control.Lens.Wrapped
t ~ TracedT m' w' a' => Rewrapped (TracedT m w a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Compose f' g' a' => Rewrapped (Compose f g a) t
Instance details Defined in Control.Lens.Wrapped
t ~ ComposeCF f' g' a' => Rewrapped (ComposeCF f g a) t
Instance details Defined in Control.Lens.Wrapped
t ~ ComposeFC f' g' a' => Rewrapped (ComposeFC f g a) t
Instance details Defined in Control.Lens.Wrapped
t ~ ApT f' g' a' => Rewrapped (ApT f g a) t
Instance details Defined in Control.Lens.Wrapped
t ~ CofreeT f' w' a' => Rewrapped (CofreeT f w a) t
Instance details Defined in Control.Lens.Wrapped
t ~ FreeT f' m' a' => Rewrapped (FreeT f m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Static f' a' b' => Rewrapped (Static f a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ Tagged s' a' => Rewrapped (Tagged s a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Backwards g b => Rewrapped (Backwards f a) t
Instance details Defined in Control.Lens.Wrapped
t ~ ErrorT e' m' a' => Rewrapped (ErrorT e m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ ExceptT e' m' a' => Rewrapped (ExceptT e m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ IdentityT n b => Rewrapped (IdentityT m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ ReaderT s n b => Rewrapped (ReaderT r m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ StateT s' m' a' => Rewrapped (StateT s m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ StateT s' m' a' => Rewrapped (StateT s m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ WriterT w' m' a' => Rewrapped (WriterT w m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ WriterT w' m' a' => Rewrapped (WriterT w m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Constant a' b' => Rewrapped (Constant a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ Reverse g b => Rewrapped (Reverse f a) t
Instance details Defined in Control.Lens.Wrapped
Rewrapped (Query v a m) (Query v' a' m')
Instance details Defined in Diagrams.Core.Query
Rewrapped (Trail' Line v n) (Trail' Line v' n') Source #
Instance details Defined in Diagrams.Trail
t ~ K1 i' c' p' => Rewrapped (K1 i c p) t
Instance details Defined in Control.Lens.Wrapped
t ~ Costar f' d' c' => Rewrapped (Costar f d c) t
Instance details Defined in Control.Lens.Wrapped
t ~ Forget r' a' b' => Rewrapped (Forget r a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ Star f' d' c' => Rewrapped (Star f d c) t
Instance details Defined in Control.Lens.Wrapped
t ~ ContT r' m' a' => Rewrapped (ContT r m a) t
Instance details Defined in Control.Lens.Wrapped
Rewrapped (QDiagram b v n m) (QDiagram b' v' n' m')
Instance details Defined in Diagrams.Core.Types
Rewrapped (SubMap b v n m) (SubMap b' v' n' m')
Instance details Defined in Diagrams.Core.Types
t ~ Compose f' g' a' => Rewrapped (Compose f g a) t
Instance details Defined in Control.Lens.Wrapped
t ~ (f' :.: g') p' => Rewrapped ((f :.: g) p) t
Instance details Defined in Control.Lens.Wrapped
t ~ M1 i' c' f' p' => Rewrapped (M1 i c f p) t
Instance details Defined in Control.Lens.Wrapped
t ~ Clown f' a' b' => Rewrapped (Clown f a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ Flip p' a' b' => Rewrapped (Flip p a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ Joker g' a' b' => Rewrapped (Joker g a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ WrappedBifunctor p' a' b' => Rewrapped (WrappedBifunctor p a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ WrappedArrow p' a' b' => Rewrapped (WrappedArrow p a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ Semi m' a' b' => Rewrapped (Semi m a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ WrappedCategory k' a' b' => Rewrapped (WrappedCategory k6 a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ Dual k' a' b' => Rewrapped (Dual k6 a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ RWST r' w' s' m' a' => Rewrapped (RWST r w s m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ RWST r' w' s' m' a' => Rewrapped (RWST r w s m a) t
Instance details Defined in Control.Lens.Wrapped
t ~ Tannen f' p' a' b' => Rewrapped (Tannen f p a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ Cayley f' p' a' b' => Rewrapped (Cayley f p a b) t
Instance details Defined in Control.Lens.Wrapped
t ~ Biff p' f' g' a' b' => Rewrapped (Biff p f g a b) t
Instance details Defined in Control.Lens.Wrapped

class (Rewrapped s t, Rewrapped t s) => Rewrapping s t #

Instances

Instances details

(Rewrapped s t, Rewrapped t s) => Rewrapping s t
Instance details Defined in Control.Lens.Wrapped

unsnoc :: Snoc s s a a => s -> Maybe (s, a) #

Attempt to extract the right-most element from a container, and a version of the container without that element.

>>> unsnoc (LazyT.pack "hello!")
Just ("hello",'!')

>>> unsnoc (LazyT.pack "")
Nothing

>>> unsnoc (Seq.fromList [b,c,a])
Just (fromList [b,c],a)

>>> unsnoc (Seq.fromList [])
Nothing

snoc :: Snoc s s a a => s -> a -> s infixl 5 #

snoc an element onto the end of a container.

>>> snoc (Seq.fromList []) a
fromList [a]

>>> snoc (Seq.fromList [b, c]) a
fromList [b,c,a]

>>> snoc (LazyT.pack "hello") '!'
"hello!"

(|>) :: Snoc s s a a => s -> a -> s infixl 5 #

snoc an element onto the end of a container.

This is an infix alias for snoc.

>>> Seq.fromList [] |> a
fromList [a]

>>> Seq.fromList [b, c] |> a
fromList [b,c,a]

>>> LazyT.pack "hello" |> '!'
"hello!"

_last :: Snoc s s a a => Traversal' s a #

A Traversal reading and writing to the last element of a non-empty container.

>>> [a,b,c]^?!_last
c

>>> []^?_last
Nothing

>>> [a,b,c] & _last %~ f
[a,b,f c]

>>> [1,2]^?_last
Just 2

>>> [] & _last .~ 1
[]

>>> [0] & _last .~ 2
[2]

>>> [0,1] & _last .~ 2
[0,2]

This Traversal is not limited to lists, however. We can also work with other containers, such as a Vector.

>>> Vector.fromList "abcde" ^? _last
Just 'e'

>>> Vector.empty ^? _last
Nothing

>>> (Vector.fromList "abcde" & _last .~ 'Q') == Vector.fromList "abcdQ"
True

_last :: Traversal' [a] a
_last :: Traversal' (Seq a) a
_last :: Traversal' (Vector a) a

_init :: Snoc s s a a => Traversal' s s #

A Traversal reading and replacing all but the a last element of a non-empty container.

>>> [a,b,c,d]^?_init
Just [a,b,c]

>>> []^?_init
Nothing

>>> [a,b] & _init .~ [c,d,e]
[c,d,e,b]

>>> [] & _init .~ [a,b]
[]

>>> [a,b,c,d] & _init.traverse %~ f
[f a,f b,f c,d]

>>> [1,2,3]^?_init
Just [1,2]

>>> [1,2,3,4]^?!_init
[1,2,3]

>>> "hello"^._init
"hell"

>>> ""^._init
""

_init :: Traversal' [a] [a]
_init :: Traversal' (Seq a) (Seq a)
_init :: Traversal' (Vector a) (Vector a)

_tail :: Cons s s a a => Traversal' s s #

A Traversal reading and writing to the tail of a non-empty container.

>>> [a,b] & _tail .~ [c,d,e]
[a,c,d,e]

>>> [] & _tail .~ [a,b]
[]

>>> [a,b,c,d,e] & _tail.traverse %~ f
[a,f b,f c,f d,f e]

>>> [1,2] & _tail .~ [3,4,5]
[1,3,4,5]

>>> [] & _tail .~ [1,2]
[]

>>> [a,b,c]^?_tail
Just [b,c]

>>> [1,2]^?!_tail
[2]

>>> "hello"^._tail
"ello"

>>> ""^._tail
""

This isn't limited to lists. For instance you can also traverse the tail of a Seq.

>>> Seq.fromList [a,b] & _tail .~ Seq.fromList [c,d,e]
fromList [a,c,d,e]

>>> Seq.fromList [a,b,c] ^? _tail
Just (fromList [b,c])

>>> Seq.fromList [] ^? _tail
Nothing

_tail :: Traversal' [a] [a]
_tail :: Traversal' (Seq a) (Seq a)
_tail :: Traversal' (Vector a) (Vector a)

_head :: Cons s s a a => Traversal' s a #

A Traversal reading and writing to the head of a non-empty container.

>>> [a,b,c]^? _head
Just a

>>> [a,b,c] & _head .~ d
[d,b,c]

>>> [a,b,c] & _head %~ f
[f a,b,c]

>>> [] & _head %~ f
[]

>>> [1,2,3]^?!_head
1

>>> []^?_head
Nothing

>>> [1,2]^?_head
Just 1

>>> [] & _head .~ 1
[]

>>> [0] & _head .~ 2
[2]

>>> [0,1] & _head .~ 2
[2,1]

This isn't limited to lists.

For instance you can also traverse the head of a Seq:

>>> Seq.fromList [a,b,c,d] & _head %~ f
fromList [f a,b,c,d]

>>> Seq.fromList [] ^? _head
Nothing

>>> Seq.fromList [a,b,c,d] ^? _head
Just a

_head :: Traversal' [a] a
_head :: Traversal' (Seq a) a
_head :: Traversal' (Vector a) a

uncons :: Cons s s a a => s -> Maybe (a, s) #

Attempt to extract the left-most element from a container, and a version of the container without that element.

>>> uncons []
Nothing

>>> uncons [a, b, c]
Just (a,[b,c])

cons :: Cons s s a a => a -> s -> s infixr 5 #

cons an element onto a container.

>>> cons a []
[a]

>>> cons a [b, c]
[a,b,c]

>>> cons a (Seq.fromList [])
fromList [a]

>>> cons a (Seq.fromList [b, c])
fromList [a,b,c]

(<|) :: Cons s s a a => a -> s -> s infixr 5 #

cons an element onto a container.

This is an infix alias for cons.

>>> a <| []
[a]

>>> a <| [b, c]
[a,b,c]

>>> a <| Seq.fromList []
fromList [a]

>>> a <| Seq.fromList [b, c]
fromList [a,b,c]

pattern (:<) :: Cons b b a a => a -> b -> b infixr 5 #

pattern (:>) :: Snoc a a b b => a -> b -> a infixl 5 #

class Cons s t a b | s -> a, t -> b, s b -> t, t a -> s where #

This class provides a way to attach or detach elements on the left side of a structure in a flexible manner.

Methods

_Cons :: Prism s t (a, s) (b, t) #

_Cons :: Prism [a] [b] (a, [a]) (b, [b])
_Cons :: Prism (Seq a) (Seq b) (a, Seq a) (b, Seq b)
_Cons :: Prism (Vector a) (Vector b) (a, Vector a) (b, Vector b)
_Cons :: Prism' String (Char, String)
_Cons :: Prism' Text (Char, Text)
_Cons :: Prism' ByteString (Word8, ByteString)

Instances

Instances details

Cons ByteString ByteString Word8 Word8
Instance details Defined in Control.Lens.Cons Methods _Cons :: Prism ByteString ByteString (Word8, ByteString) (Word8, ByteString) #
Cons ByteString ByteString Word8 Word8
Instance details Defined in Control.Lens.Cons Methods _Cons :: Prism ByteString ByteString (Word8, ByteString) (Word8, ByteString) #
Cons Text Text Char Char
Instance details Defined in Control.Lens.Cons Methods _Cons :: Prism Text Text (Char, Text) (Char, Text) #
Cons Text Text Char Char
Instance details Defined in Control.Lens.Cons Methods _Cons :: Prism Text Text (Char, Text) (Char, Text) #
Cons (ZipList a) (ZipList b) a b
Instance details Defined in Control.Lens.Cons Methods _Cons :: Prism (ZipList a) (ZipList b) (a, ZipList a) (b, ZipList b) #
Cons (Seq a) (Seq b) a b
Instance details Defined in Control.Lens.Cons Methods _Cons :: Prism (Seq a) (Seq b) (a, Seq a) (b, Seq b) #
Cons (Vector a) (Vector b) a b
Instance details Defined in Control.Lens.Cons Methods _Cons :: Prism (Vector a) (Vector b) (a, Vector a) (b, Vector b) #
(Prim a, Prim b) => Cons (Vector a) (Vector b) a b
Instance details Defined in Control.Lens.Cons Methods _Cons :: Prism (Vector a) (Vector b) (a, Vector a) (b, Vector b) #
(Storable a, Storable b) => Cons (Vector a) (Vector b) a b
Instance details Defined in Control.Lens.Cons Methods _Cons :: Prism (Vector a) (Vector b) (a, Vector a) (b, Vector b) #
(Unbox a, Unbox b) => Cons (Vector a) (Vector b) a b
Instance details Defined in Control.Lens.Cons Methods _Cons :: Prism (Vector a) (Vector b) (a, Vector a) (b, Vector b) #
Cons [a] [b] a b
Instance details Defined in Control.Lens.Cons Methods _Cons :: Prism [a] [b] (a, [a]) (b, [b]) #
(Measured m a, Measured n b) => Cons (FingerTree m a) (FingerTree n b) a b Source #
Instance details Defined in Diagrams.Trail Methods _Cons :: Prism (FingerTree m a) (FingerTree n b) (a, FingerTree m a) (b, FingerTree n b) #
Cons (Path v n) (Path v' n') (Located (Trail v n)) (Located (Trail v' n')) Source #
Instance details Defined in Diagrams.Path Methods _Cons :: Prism (Path v n) (Path v' n') (Located (Trail v n), Path v n) (Located (Trail v' n'), Path v' n') #
(Metric v, OrderedField n, Metric u, OrderedField n') => Cons (SegTree v n) (SegTree u n') (Segment Closed v n) (Segment Closed u n') Source #
Instance details Defined in Diagrams.Trail Methods _Cons :: Prism (SegTree v n) (SegTree u n') (Segment Closed v n, SegTree v n) (Segment Closed u n', SegTree u n') #
(Metric v, OrderedField n, Metric u, OrderedField n') => Cons (Trail' Line v n) (Trail' Line u n') (Segment Closed v n) (Segment Closed u n') Source #
Instance details Defined in Diagrams.Trail Methods _Cons :: Prism (Trail' Line v n) (Trail' Line u n') (Segment Closed v n, Trail' Line v n) (Segment Closed u n', Trail' Line u n') #

class Snoc s t a b | s -> a, t -> b, s b -> t, t a -> s where #

This class provides a way to attach or detach elements on the right side of a structure in a flexible manner.

Methods

_Snoc :: Prism s t (s, a) (t, b) #

_Snoc :: Prism [a] [b] ([a], a) ([b], b)
_Snoc :: Prism (Seq a) (Seq b) (Seq a, a) (Seq b, b)
_Snoc :: Prism (Vector a) (Vector b) (Vector a, a) (Vector b, b)
_Snoc :: Prism' String (String, Char)
_Snoc :: Prism' Text (Text, Char)
_Snoc :: Prism' ByteString (ByteString, Word8)

Instances

Instances details

Snoc ByteString ByteString Word8 Word8
Instance details Defined in Control.Lens.Cons Methods _Snoc :: Prism ByteString ByteString (ByteString, Word8) (ByteString, Word8) #
Snoc ByteString ByteString Word8 Word8
Instance details Defined in Control.Lens.Cons Methods _Snoc :: Prism ByteString ByteString (ByteString, Word8) (ByteString, Word8) #
Snoc Text Text Char Char
Instance details Defined in Control.Lens.Cons Methods _Snoc :: Prism Text Text (Text, Char) (Text, Char) #
Snoc Text Text Char Char
Instance details Defined in Control.Lens.Cons Methods _Snoc :: Prism Text Text (Text, Char) (Text, Char) #
Snoc (ZipList a) (ZipList b) a b
Instance details Defined in Control.Lens.Cons Methods _Snoc :: Prism (ZipList a) (ZipList b) (ZipList a, a) (ZipList b, b) #
Snoc (Seq a) (Seq b) a b
Instance details Defined in Control.Lens.Cons Methods _Snoc :: Prism (Seq a) (Seq b) (Seq a, a) (Seq b, b) #
Snoc (Vector a) (Vector b) a b
Instance details Defined in Control.Lens.Cons Methods _Snoc :: Prism (Vector a) (Vector b) (Vector a, a) (Vector b, b) #
(Prim a, Prim b) => Snoc (Vector a) (Vector b) a b
Instance details Defined in Control.Lens.Cons Methods _Snoc :: Prism (Vector a) (Vector b) (Vector a, a) (Vector b, b) #
(Storable a, Storable b) => Snoc (Vector a) (Vector b) a b
Instance details Defined in Control.Lens.Cons Methods _Snoc :: Prism (Vector a) (Vector b) (Vector a, a) (Vector b, b) #
(Unbox a, Unbox b) => Snoc (Vector a) (Vector b) a b
Instance details Defined in Control.Lens.Cons Methods _Snoc :: Prism (Vector a) (Vector b) (Vector a, a) (Vector b, b) #
Snoc [a] [b] a b
Instance details Defined in Control.Lens.Cons Methods _Snoc :: Prism [a] [b] ([a], a) ([b], b) #
(Measured m a, Measured n b) => Snoc (FingerTree m a) (FingerTree n b) a b Source #
Instance details Defined in Diagrams.Trail Methods _Snoc :: Prism (FingerTree m a) (FingerTree n b) (FingerTree m a, a) (FingerTree n b, b) #
Snoc (Path v n) (Path v' n') (Located (Trail v n)) (Located (Trail v' n')) Source #
Instance details Defined in Diagrams.Path Methods _Snoc :: Prism (Path v n) (Path v' n') (Path v n, Located (Trail v n)) (Path v' n', Located (Trail v' n')) #
(Metric v, OrderedField n, Metric u, OrderedField n') => Snoc (SegTree v n) (SegTree u n') (Segment Closed v n) (Segment Closed u n') Source #
Instance details Defined in Diagrams.Trail Methods _Snoc :: Prism (SegTree v n) (SegTree u n') (SegTree v n, Segment Closed v n) (SegTree u n', Segment Closed u n') #
(Metric v, OrderedField n, Metric u, OrderedField n') => Snoc (Trail' Line v n) (Trail' Line u n') (Segment Closed v n) (Segment Closed u n') Source #
Instance details Defined in Diagrams.Trail Methods _Snoc :: Prism (Trail' Line v n) (Trail' Line u n') (Trail' Line v n, Segment Closed v n) (Trail' Line u n', Segment Closed u n') #

pattern Empty :: AsEmpty s => s #

class AsEmpty a where #

Minimal complete definition

Nothing

Methods

_Empty :: Prism' a () #

>>> isn't _Empty [1,2,3]
True

Instances

Instances details

AsEmpty All
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' All () #
AsEmpty Any
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' Any () #
AsEmpty Event
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' Event () #
AsEmpty ByteString
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' ByteString () #
AsEmpty ByteString
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' ByteString () #
AsEmpty IntSet
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' IntSet () #
AsEmpty Ordering
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' Ordering () #
AsEmpty Text
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' Text () #
AsEmpty Text
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' Text () #
AsEmpty ()
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' () () #
AsEmpty (ZipList a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (ZipList a) () #
AsEmpty (First a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (First a) () #
AsEmpty (Last a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (Last a) () #
AsEmpty a => AsEmpty (Dual a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (Dual a) () #
(Eq a, Num a) => AsEmpty (Product a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (Product a) () #
(Eq a, Num a) => AsEmpty (Sum a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (Sum a) () #
AsEmpty (IntMap a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (IntMap a) () #
AsEmpty (Seq a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (Seq a) () #
AsEmpty (Set a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (Set a) () #
AsEmpty (Clip n) Source #
Instance details Defined in Diagrams.TwoD.Path Methods _Empty :: Prism' (Clip n) () #
AsEmpty (HashSet a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (HashSet a) () #
AsEmpty (Vector a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (Vector a) () #
Storable a => AsEmpty (Vector a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (Vector a) () #
Unbox a => AsEmpty (Vector a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (Vector a) () #
AsEmpty (Maybe a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (Maybe a) () #
AsEmpty [a]
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' [a] () #
AsEmpty (Map k a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (Map k a) () #
AsEmpty (BoundingBox v n) Source #
Instance details Defined in Diagrams.BoundingBox Methods _Empty :: Prism' (BoundingBox v n) () #
AsEmpty (Path v n) Source #
Instance details Defined in Diagrams.Path Methods _Empty :: Prism' (Path v n) () #
(Metric v, OrderedField n) => AsEmpty (Trail v n) Source #
Instance details Defined in Diagrams.Trail Methods _Empty :: Prism' (Trail v n) () #
AsEmpty (HashMap k a)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (HashMap k a) () #
(AsEmpty a, AsEmpty b) => AsEmpty (a, b)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (a, b) () #
(Metric v, OrderedField n) => AsEmpty (Trail' Line v n) Source #
Instance details Defined in Diagrams.Trail Methods _Empty :: Prism' (Trail' Line v n) () #
(AsEmpty a, AsEmpty b, AsEmpty c) => AsEmpty (a, b, c)
Instance details Defined in Control.Lens.Empty Methods _Empty :: Prism' (a, b, c) () #

coerced :: forall s t a b. (Coercible s a, Coercible t b) => Iso s t a b #

Data types that are representationally equal are isomorphic.

This is only available on GHC 7.8+

Since: lens-4.13

seconding :: forall (f :: Type -> Type -> Type) (g :: Type -> Type -> Type) s t a b x y. (Bifunctor f, Bifunctor g) => AnIso s t a b -> Iso (f x s) (g y t) (f x a) (g y b) #

Lift an Iso into the second argument of a Bifunctor. This is essentially the same as mapping, but it takes a 'Bifunctor p' constraint instead of a 'Functor (p a)' one.

seconding :: Bifunctor p => Iso s t a b -> Iso (p x s) (p y t) (p x a) (p y b)
seconding :: Bifunctor p => Iso' s a -> Iso' (p x s) (p x a)

firsting :: forall (f :: Type -> Type -> Type) (g :: Type -> Type -> Type) s t a b x y. (Bifunctor f, Bifunctor g) => AnIso s t a b -> Iso (f s x) (g t y) (f a x) (g b y) #

Lift an Iso into the first argument of a Bifunctor.

firsting :: Bifunctor p => Iso s t a b -> Iso (p s x) (p t y) (p a x) (p b y)
firsting :: Bifunctor p => Iso' s a -> Iso' (p s x) (p a x)

bimapping :: forall (f :: Type -> Type -> Type) (g :: Type -> Type -> Type) s t a b s' t' a' b'. (Bifunctor f, Bifunctor g) => AnIso s t a b -> AnIso s' t' a' b' -> Iso (f s s') (g t t') (f a a') (g b b') #

Lift two Isos into both arguments of a Bifunctor.

bimapping :: Bifunctor p => Iso s t a b -> Iso s' t' a' b' -> Iso (p s s') (p t t') (p a a') (p b b')
bimapping :: Bifunctor p => Iso' s a -> Iso' s' a' -> Iso' (p s s') (p a a')

rmapping :: forall (p :: Type -> Type -> Type) (q :: Type -> Type -> Type) s t a b x y. (Profunctor p, Profunctor q) => AnIso s t a b -> Iso (p x s) (q y t) (p x a) (q y b) #

Lift an Iso covariantly into the right argument of a Profunctor.

rmapping :: Profunctor p => Iso s t a b -> Iso (p x s) (p y t) (p x a) (p y b)
rmapping :: Profunctor p => Iso' s a -> Iso' (p x s) (p x a)

lmapping :: forall (p :: Type -> Type -> Type) (q :: Type -> Type -> Type) s t a b x y. (Profunctor p, Profunctor q) => AnIso s t a b -> Iso (p a x) (q b y) (p s x) (q t y) #

Lift an Iso contravariantly into the left argument of a Profunctor.

lmapping :: Profunctor p => Iso s t a b -> Iso (p a x) (p b y) (p s x) (p t y)
lmapping :: Profunctor p => Iso' s a -> Iso' (p a x) (p s x)

dimapping :: forall (p :: Type -> Type -> Type) (q :: Type -> Type -> Type) s t a b s' t' a' b'. (Profunctor p, Profunctor q) => AnIso s t a b -> AnIso s' t' a' b' -> Iso (p a s') (q b t') (p s a') (q t b') #

Lift two Isos into both arguments of a Profunctor simultaneously.

dimapping :: Profunctor p => Iso s t a b -> Iso s' t' a' b' -> Iso (p a s') (p b t') (p s a') (p t b')
dimapping :: Profunctor p => Iso' s a -> Iso' s' a' -> Iso' (p a s') (p s a')

contramapping :: forall (f :: Type -> Type) s t a b. Contravariant f => AnIso s t a b -> Iso (f a) (f b) (f s) (f t) #

Lift an Iso into a Contravariant functor.

contramapping :: Contravariant f => Iso s t a b -> Iso (f a) (f b) (f s) (f t)
contramapping :: Contravariant f => Iso' s a -> Iso' (f a) (f s)

imagma :: Over (Indexed i) (Molten i a b) s t a b -> Iso s t' (Magma i t b a) (Magma j t' c c) #

This isomorphism can be used to inspect an IndexedTraversal to see how it associates the structure and it can also be used to bake the IndexedTraversal into a Magma so that you can traverse over it multiple times with access to the original indices.

magma :: LensLike (Mafic a b) s t a b -> Iso s u (Magma Int t b a) (Magma j u c c) #

This isomorphism can be used to inspect a Traversal to see how it associates the structure and it can also be used to bake the Traversal into a Magma so that you can traverse over it multiple times.

involuted :: (a -> a) -> Iso' a a #

Given a function that is its own inverse, this gives you an Iso using it in both directions.

involuted ≡ join iso

>>> "live" ^. involuted reverse
"evil"

>>> "live" & involuted reverse %~ ('d':)
"lived"

reversed :: Reversing a => Iso' a a #

An Iso between a list, ByteString, Text fragment, etc. and its reversal.

>>> "live" ^. reversed
"evil"

>>> "live" & reversed %~ ('d':)
"lived"

lazy :: Strict lazy strict => Iso' strict lazy #

An Iso between the strict variant of a structure and its lazy counterpart.

lazy = from strict

strict :: Strict lazy strict => Iso' lazy strict #

An Iso between the lazy variant of a structure and its strict counterpart.

strict = from lazy

swapped :: forall (p :: Type -> Type -> Type) a b c d. Swap p => Iso (p a b) (p c d) (p b a) (p d c) #

swapped . swapped ≡ id
first f . swapped = swapped . second f
second g . swapped = swapped . first g
bimap f g . swapped = swapped . bimap g f

>>> (1,2)^.swapped
(2,1)

flipped :: Iso (a -> b -> c) (a' -> b' -> c') (b -> a -> c) (b' -> a' -> c') #

The isomorphism for flipping a function.

>>> ((,)^.flipped) 1 2
(2,1)

uncurried :: Iso (a -> b -> c) (d -> e -> f) ((a, b) -> c) ((d, e) -> f) #

The canonical isomorphism for uncurrying and currying a function.

uncurried = iso uncurry curry

uncurried = from curried

>>> ((+)^.uncurried) (1,2)
3

curried :: Iso ((a, b) -> c) ((d, e) -> f) (a -> b -> c) (d -> e -> f) #

The canonical isomorphism for currying and uncurrying a function.

curried = iso curry uncurry

>>> (fst^.curried) 3 4
3

>>> view curried fst 3 4
3

anon :: a -> (a -> Bool) -> Iso' (Maybe a) a #

anon a p generalizes non a to take any value and a predicate.

This function assumes that p a holds True and generates an isomorphism between Maybe (a | not (p a)) and a.

>>> Map.empty & at "hello" . anon Map.empty Map.null . at "world" ?~ "!!!"
fromList [("hello",fromList [("world","!!!")])]

>>> Map.fromList [("hello",Map.fromList [("world","!!!")])] & at "hello" . anon Map.empty Map.null . at "world" .~ Nothing
fromList []

non' :: APrism' a () -> Iso' (Maybe a) a #

non' p generalizes non (p # ()) to take any unit Prism

This function generates an isomorphism between Maybe (a | isn't p a) and a.

>>> Map.singleton "hello" Map.empty & at "hello" . non' _Empty . at "world" ?~ "!!!"
fromList [("hello",fromList [("world","!!!")])]

>>> Map.fromList [("hello",Map.fromList [("world","!!!")])] & at "hello" . non' _Empty . at "world" .~ Nothing
fromList []

non :: Eq a => a -> Iso' (Maybe a) a #

If v is an element of a type a, and a' is a sans the element v, then non v is an isomorphism from Maybe a' to a.

non ≡ non' . only

Keep in mind this is only a real isomorphism if you treat the domain as being Maybe (a sans v).

This is practically quite useful when you want to have a Map where all the entries should have non-zero values.

>>> Map.fromList [("hello",1)] & at "hello" . non 0 +~ 2
fromList [("hello",3)]

>>> Map.fromList [("hello",1)] & at "hello" . non 0 -~ 1
fromList []

>>> Map.fromList [("hello",1)] ^. at "hello" . non 0
1

>>> Map.fromList [] ^. at "hello" . non 0
0

This combinator is also particularly useful when working with nested maps.

e.g. When you want to create the nested Map when it is missing:

>>> Map.empty & at "hello" . non Map.empty . at "world" ?~ "!!!"
fromList [("hello",fromList [("world","!!!")])]

and when have deleting the last entry from the nested Map mean that we should delete its entry from the surrounding one:

>>> Map.fromList [("hello",Map.fromList [("world","!!!")])] & at "hello" . non Map.empty . at "world" .~ Nothing
fromList []

It can also be used in reverse to exclude a given value:

>>> non 0 # rem 10 4
Just 2

>>> non 0 # rem 10 5
Nothing

mapping :: forall (f :: Type -> Type) (g :: Type -> Type) s t a b. (Functor f, Functor g) => AnIso s t a b -> Iso (f s) (g t) (f a) (g b) #

This can be used to lift any Iso into an arbitrary Functor.

enum :: Enum a => Iso' Int a #

This isomorphism can be used to convert to or from an instance of Enum.

>>> LT^.from enum
0

>>> 97^.enum :: Char
'a'

Note: this is only an isomorphism from the numeric range actually used and it is a bit of a pleasant fiction, since there are questionable Enum instances for Double, and Float that exist solely for [1.0 .. 4.0] sugar and the instances for those and Integer don't cover all values in their range.

under :: AnIso s t a b -> (t -> s) -> b -> a #

The opposite of working over a Setter is working under an isomorphism.

under ≡ over . from

under :: Iso s t a b -> (t -> s) -> b -> a

xplatf :: forall {k} {k2} f g (s :: k) (t :: k2) (a :: k) (b :: k2). Optic (Costar f) g s t a b -> (f a -> g b) -> f s -> g t #

xplatf = auf . from but with a nicer signature.

>>> xplatf (_Unwrapping Sum) (foldMapOf both) Prelude.length ("hello","world")
10

xplatf :: Iso s t a b -> ((r -> a) -> e -> b) -> (r -> s) -> e -> t

xplat :: forall {k2} s g (t :: k2) a (b :: k2). Optic (Costar ((->) s)) g s t a b -> ((s -> a) -> g b) -> g t #

xplat = au . from but with a nicer signature.

auf :: (Functor f, Functor g) => AnIso s t a b -> (f t -> g s) -> f b -> g a #

Based on ala' from Conor McBride's work on Epigram.

This version is generalized to accept any Iso, not just a newtype.

For a version you pass the name of the newtype constructor to, see alaf.

>>> auf (_Wrapping Sum) (foldMapOf both) Prelude.length ("hello","world")
10

Mnemonically, the German auf plays a similar role to à la, and the combinator is au with an extra function argument:

auf :: Iso s t a b -> ((r -> t) -> e -> s) -> (r -> b) -> e -> a

but the signature is general.

Note: The direction of the Iso required for this function changed in lens 4.18 to match up with the behavior of au. For the old behavior use xplatf or for a version that is compatible across both old and new versions of lens you can just use coerce!

au :: Functor f => AnIso s t a b -> ((b -> t) -> f s) -> f a #

Based on ala from Conor McBride's work on Epigram.

This version is generalized to accept any Iso, not just a newtype.

>>> au (_Wrapping Sum) foldMap [1,2,3,4]
10

You may want to think of this combinator as having the following, simpler type:

au :: AnIso s t a b -> ((b -> t) -> e -> s) -> e -> a

au = xplat . from

cloneIso :: AnIso s t a b -> Iso s t a b #

Convert from AnIso back to any Iso.

This is useful when you need to store an isomorphism as a data type inside a container and later reconstitute it as an overloaded function.

See cloneLens or cloneTraversal for more information on why you might want to do this.

withIso :: forall s t a b (rep :: RuntimeRep) (r :: TYPE rep). AnIso s t a b -> ((s -> a) -> (b -> t) -> r) -> r #

Extract the two functions, one from s -> a and one from b -> t that characterize an Iso.

from :: AnIso s t a b -> Iso b a t s #

Invert an isomorphism.

from (from l) ≡ l

iso :: (s -> a) -> (b -> t) -> Iso s t a b #

Build a simple isomorphism from a pair of inverse functions.

view (iso f g) ≡ f
view (from (iso f g)) ≡ g
over (iso f g) h ≡ g . h . f
over (from (iso f g)) h ≡ f . h . g

pattern Strict :: Strict s t => t -> s #

pattern Lazy :: Strict t s => t -> s #

pattern Swapped :: Swap p => p b a -> p a b #

pattern Reversed :: Reversing t => t -> t #

pattern List :: IsList l => [Item l] -> l #

type AnIso s t a b = Exchange a b a (Identity b) -> Exchange a b s (Identity t) #

When you see this as an argument to a function, it expects an Iso.

type AnIso' s a = AnIso s s a a #

A Simple AnIso.

withEquality :: forall {k1} {k2} (s :: k1) (t :: k2) (a :: k1) (b :: k2) (rep :: RuntimeRep) (r :: TYPE rep). AnEquality s t a b -> ((s :~: a) -> (b :~: t) -> r) -> r #

A version of substEq that provides explicit, rather than implicit, equality evidence.

fromLeibniz' :: forall {k2} (s :: k2) (a :: k2). ((s :~: s) -> s :~: a) -> Equality' s a #

Convert Leibniz equality to equality. Reverses mapEq in Simple cases.

The type should be understood as

fromLeibniz' :: (forall f. f s -> f a) -> Equality' s a

fromLeibniz :: forall {k1} {k2} (a :: k1) (b :: k2) (s :: k1) (t :: k2). (Identical a b a b -> Identical a b s t) -> Equality s t a b #

Convert a "profunctor lens" form of equality to an equality. Reverses overEquality.

The type should be understood as

fromLeibniz :: (forall p. p a b -> p s t) -> Equality s t a b

underEquality :: forall {k1} {k2} (s :: k1) (t :: k2) (a :: k1) (b :: k2) p. AnEquality s t a b -> p t s -> p b a #

The opposite of working overEquality is working underEquality.

overEquality :: forall {k1} {k2} (s :: k1) (t :: k2) (a :: k1) (b :: k2) p. AnEquality s t a b -> p a b -> p s t #

Recover a "profunctor lens" form of equality. Reverses fromLeibniz.

equality' :: forall {k2} (a :: k2) (b :: k2). (a :~: b) -> Equality' a b #

A Simple version of equality

equality :: forall {k1} {k2} (s :: k1) (a :: k1) (b :: k2) (t :: k2). (s :~: a) -> (b :~: t) -> Equality s t a b #

Construct an Equality from explicit equality evidence.

cloneEquality :: forall {k1} {k2} (s :: k1) (t :: k2) (a :: k1) (b :: k2). AnEquality s t a b -> Equality s t a b #

simple :: forall {k2} (a :: k2). Equality' a a #

Composition with this isomorphism is occasionally useful when your Lens, Traversal or Iso has a constraint on an unused argument to force that argument to agree with the type of a used argument and avoid ScopedTypeVariables or other ugliness.

simply :: forall {k} {k1} p (f :: k -> k1) (s :: k) (a :: k) (rep :: RuntimeRep) (r :: TYPE rep). (Optic' p f s a -> r) -> Optic' p f s a -> r #

This is an adverb that can be used to modify many other Lens combinators to make them require simple lenses, simple traversals, simple prisms or simple isos as input.

fromEq :: forall {k2} {k1} (s :: k2) (t :: k1) (a :: k2) (b :: k1). AnEquality s t a b -> Equality b a t s #

Equality is symmetric.

mapEq :: forall k1 k2 (s :: k1) (t :: k2) (a :: k1) (b :: k2) f. AnEquality s t a b -> f s -> f a #

We can use Equality to do substitution into anything.

substEq :: forall {k1} {k2} (s :: k1) (t :: k2) (a :: k1) (b :: k2) (rep :: RuntimeRep) (r :: TYPE rep). AnEquality s t a b -> ((s ~ a, t ~ b) => r) -> r #

Substituting types with Equality.

runEq :: forall {k1} {k2} (s :: k1) (t :: k2) (a :: k1) (b :: k2). AnEquality s t a b -> Identical s t a b #

Extract a witness of type Equality.

data Identical (a :: k) (b :: k1) (s :: k) (t :: k1) where #

Provides witness that (s ~ a, b ~ t) holds.

Constructors

Identical :: forall {k} {k1} (a :: k) (b :: k1). Identical a b a b

type AnEquality (s :: k) (t :: k1) (a :: k) (b :: k2) = Identical a (Proxy b) a (Proxy b) -> Identical a (Proxy b) s (Proxy t) #

When you see this as an argument to a function, it expects an Equality.

type AnEquality' (s :: k) (a :: k) = AnEquality s s a a #

A Simple AnEquality.

itraverseByOf :: IndexedTraversal i s t a b -> (forall x. x -> f x) -> (forall x y. f (x -> y) -> f x -> f y) -> (i -> a -> f b) -> s -> f t #

itraverseBy :: TraversableWithIndex i t => (forall x. x -> f x) -> (forall x y. f (x -> y) -> f x -> f y) -> (i -> a -> f b) -> t a -> f (t b) #

ifoldMapByOf :: IndexedFold i t a -> (r -> r -> r) -> r -> (i -> a -> r) -> t -> r #

ifoldMapBy :: FoldableWithIndex i t => (r -> r -> r) -> r -> (i -> a -> r) -> t a -> r #

itraversed :: forall i (t :: Type -> Type) a b. TraversableWithIndex i t => IndexedTraversal i (t a) (t b) a b #

The IndexedTraversal of a TraversableWithIndex container.

ifolded :: forall i (f :: Type -> Type) a. FoldableWithIndex i f => IndexedFold i (f a) a #

The IndexedFold of a FoldableWithIndex container.

ifolded . asIndex is a fold over the keys of a FoldableWithIndex.

>>> Data.Map.fromList [(2, "hello"), (1, "world")]^..ifolded.asIndex
[1,2]

imapped :: forall i (f :: Type -> Type) a b. FunctorWithIndex i f => IndexedSetter i (f a) (f b) a b #

The IndexedSetter for a FunctorWithIndex.

If you don't need access to the index, then mapped is more flexible in what it accepts.

index :: (Indexable i p, Eq i, Applicative f) => i -> Optical' p (Indexed i) f a a #

This allows you to filter an IndexedFold, IndexedGetter, IndexedTraversal or IndexedLens based on an index.

>>> ["hello","the","world","!!!"]^?traversed.index 2
Just "world"

icompose :: Indexable p c => (i -> j -> p) -> (Indexed i s t -> r) -> (Indexed j a b -> s -> t) -> c a b -> r #

Composition of Indexed functions with a user supplied function for combining indices.

reindexed :: Indexable j p => (i -> j) -> (Indexed i a b -> r) -> p a b -> r #

Remap the index.

selfIndex :: Indexable a p => p a fb -> a -> fb #

Use a value itself as its own index. This is essentially an indexed version of id.

Note: When used to modify the value, this can break the index requirements assumed by indices and similar, so this is only properly an IndexedGetter, but it can be used as more.

selfIndex :: IndexedGetter a a b

(<.) :: Indexable i p => (Indexed i s t -> r) -> ((a -> b) -> s -> t) -> p a b -> r infixr 9 #

Compose an Indexed function with a non-indexed function.

Mnemonically, the < points to the indexing we want to preserve.

>>> let nestedMap = (fmap Map.fromList . Map.fromList) [(1, [(10, "one,ten"), (20, "one,twenty")]), (2, [(30, "two,thirty"), (40,"two,forty")])]
>>> nestedMap^..(itraversed<.itraversed).withIndex
[(1,"one,ten"),(1,"one,twenty"),(2,"two,thirty"),(2,"two,forty")]

newtype ReifiedLens s t a b #

Reify a ReifiedLens so it can be stored safely in a container.

Constructors

Lens
Fields runLens :: Lens s t a b

type ReifiedLens' s a = ReifiedLens s s a a #

type ReifiedLens' = Simple ReifiedLens

newtype ReifiedIndexedLens i s t a b #

Reify an ReifiedIndexedLens so it can be stored safely in a container.

Constructors

IndexedLens
Fields runIndexedLens :: IndexedLens i s t a b

type ReifiedIndexedLens' i s a = ReifiedIndexedLens i s s a a #

type ReifiedIndexedLens' i = Simple (ReifiedIndexedLens i)

newtype ReifiedIndexedTraversal i s t a b #

Reify an ReifiedIndexedTraversal so it can be stored safely in a container.

Constructors

IndexedTraversal
Fields runIndexedTraversal :: IndexedTraversal i s t a b

type ReifiedIndexedTraversal' i s a = ReifiedIndexedTraversal i s s a a #

type ReifiedIndexedTraversal' i = Simple (ReifiedIndexedTraversal i)

newtype ReifiedTraversal s t a b #

A form of ReifiedTraversal that can be stored monomorphically in a container.

Constructors

Traversal
Fields runTraversal :: Traversal s t a b

type ReifiedTraversal' s a = ReifiedTraversal s s a a #

type ReifiedTraversal' = Simple ReifiedTraversal

newtype ReifiedGetter s a #

Reify a ReifiedGetter so it can be stored safely in a container.

This can also be useful when combining getters in novel ways, as ReifiedGetter is isomorphic to (->) and provides similar instances.

>>> ("hello","world","!!!")^.runGetter ((,) <$> Getter _2 <*> Getter (_1.to length))
("world",5)

Constructors

Getter
Fields runGetter :: Getter s a

Instances

Instances details

Arrow ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods arr :: (b -> c) -> ReifiedGetter b c # first :: ReifiedGetter b c -> ReifiedGetter (b, d) (c, d) # second :: ReifiedGetter b c -> ReifiedGetter (d, b) (d, c) # (***) :: ReifiedGetter b c -> ReifiedGetter b' c' -> ReifiedGetter (b, b') (c, c') # (&&&) :: ReifiedGetter b c -> ReifiedGetter b c' -> ReifiedGetter b (c, c') #
ArrowApply ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods app :: ReifiedGetter (ReifiedGetter b c, b) c #
ArrowChoice ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods left :: ReifiedGetter b c -> ReifiedGetter (Either b d) (Either c d) # right :: ReifiedGetter b c -> ReifiedGetter (Either d b) (Either d c) # (+++) :: ReifiedGetter b c -> ReifiedGetter b' c' -> ReifiedGetter (Either b b') (Either c c') # (\|\|\|) :: ReifiedGetter b d -> ReifiedGetter c d -> ReifiedGetter (Either b c) d #
ArrowLoop ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods loop :: ReifiedGetter (b, d) (c, d) -> ReifiedGetter b c #
Conjoined ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods distrib :: Functor f => ReifiedGetter a b -> ReifiedGetter (f a) (f b) # conjoined :: (ReifiedGetter ~ (->) => q (a -> b) r) -> q (ReifiedGetter a b) r -> q (ReifiedGetter a b) r #
Choice ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods left' :: ReifiedGetter a b -> ReifiedGetter (Either a c) (Either b c) # right' :: ReifiedGetter a b -> ReifiedGetter (Either c a) (Either c b) #
Closed ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods closed :: ReifiedGetter a b -> ReifiedGetter (x -> a) (x -> b) #
Corepresentable ReifiedGetter
Instance details Defined in Control.Lens.Reified Associated Types type Corep ReifiedGetter :: Type -> Type # Methods cotabulate :: (Corep ReifiedGetter d -> c) -> ReifiedGetter d c #
Representable ReifiedGetter
Instance details Defined in Control.Lens.Reified Associated Types type Rep ReifiedGetter :: Type -> Type # Methods tabulate :: (d -> Rep ReifiedGetter c) -> ReifiedGetter d c #
Costrong ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods unfirst :: ReifiedGetter (a, d) (b, d) -> ReifiedGetter a b # unsecond :: ReifiedGetter (d, a) (d, b) -> ReifiedGetter a b #
Strong ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods first' :: ReifiedGetter a b -> ReifiedGetter (a, c) (b, c) # second' :: ReifiedGetter a b -> ReifiedGetter (c, a) (c, b) #
Profunctor ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods dimap :: (a -> b) -> (c -> d) -> ReifiedGetter b c -> ReifiedGetter a d # lmap :: (a -> b) -> ReifiedGetter b c -> ReifiedGetter a c # rmap :: (b -> c) -> ReifiedGetter a b -> ReifiedGetter a c # (#.) :: forall a b c q. Coercible c b => q b c -> ReifiedGetter a b -> ReifiedGetter a c # (.#) :: forall a b c q. Coercible b a => ReifiedGetter b c -> q a b -> ReifiedGetter a c #
Cosieve ReifiedGetter Identity
Instance details Defined in Control.Lens.Reified Methods cosieve :: ReifiedGetter a b -> Identity a -> b #
Sieve ReifiedGetter Identity
Instance details Defined in Control.Lens.Reified Methods sieve :: ReifiedGetter a b -> a -> Identity b #
MonadReader s (ReifiedGetter s)
Instance details Defined in Control.Lens.Reified Methods ask :: ReifiedGetter s s # local :: (s -> s) -> ReifiedGetter s a -> ReifiedGetter s a # reader :: (s -> a) -> ReifiedGetter s a #
Applicative (ReifiedGetter s)
Instance details Defined in Control.Lens.Reified Methods pure :: a -> ReifiedGetter s a # (<>) :: ReifiedGetter s (a -> b) -> ReifiedGetter s a -> ReifiedGetter s b # liftA2 :: (a -> b -> c) -> ReifiedGetter s a -> ReifiedGetter s b -> ReifiedGetter s c # (>) :: ReifiedGetter s a -> ReifiedGetter s b -> ReifiedGetter s b # (<*) :: ReifiedGetter s a -> ReifiedGetter s b -> ReifiedGetter s a #
Functor (ReifiedGetter s)
Instance details Defined in Control.Lens.Reified Methods fmap :: (a -> b) -> ReifiedGetter s a -> ReifiedGetter s b # (<$) :: a -> ReifiedGetter s b -> ReifiedGetter s a #
Monad (ReifiedGetter s)
Instance details Defined in Control.Lens.Reified Methods (>>=) :: ReifiedGetter s a -> (a -> ReifiedGetter s b) -> ReifiedGetter s b # (>>) :: ReifiedGetter s a -> ReifiedGetter s b -> ReifiedGetter s b # return :: a -> ReifiedGetter s a #
Monoid s => Comonad (ReifiedGetter s)
Instance details Defined in Control.Lens.Reified Methods extract :: ReifiedGetter s a -> a # duplicate :: ReifiedGetter s a -> ReifiedGetter s (ReifiedGetter s a) # extend :: (ReifiedGetter s a -> b) -> ReifiedGetter s a -> ReifiedGetter s b #
Monoid s => ComonadApply (ReifiedGetter s)
Instance details Defined in Control.Lens.Reified Methods (<@>) :: ReifiedGetter s (a -> b) -> ReifiedGetter s a -> ReifiedGetter s b # (@>) :: ReifiedGetter s a -> ReifiedGetter s b -> ReifiedGetter s b # (<@) :: ReifiedGetter s a -> ReifiedGetter s b -> ReifiedGetter s a #
Distributive (ReifiedGetter s)
Instance details Defined in Control.Lens.Reified Methods distribute :: Functor f => f (ReifiedGetter s a) -> ReifiedGetter s (f a) # collect :: Functor f => (a -> ReifiedGetter s b) -> f a -> ReifiedGetter s (f b) # distributeM :: Monad m => m (ReifiedGetter s a) -> ReifiedGetter s (m a) # collectM :: Monad m => (a -> ReifiedGetter s b) -> m a -> ReifiedGetter s (m b) #
Apply (ReifiedGetter s)
Instance details Defined in Control.Lens.Reified Methods (<.>) :: ReifiedGetter s (a -> b) -> ReifiedGetter s a -> ReifiedGetter s b # (.>) :: ReifiedGetter s a -> ReifiedGetter s b -> ReifiedGetter s b # (<.) :: ReifiedGetter s a -> ReifiedGetter s b -> ReifiedGetter s a # liftF2 :: (a -> b -> c) -> ReifiedGetter s a -> ReifiedGetter s b -> ReifiedGetter s c #
Bind (ReifiedGetter s)
Instance details Defined in Control.Lens.Reified Methods (>>-) :: ReifiedGetter s a -> (a -> ReifiedGetter s b) -> ReifiedGetter s b # join :: ReifiedGetter s (ReifiedGetter s a) -> ReifiedGetter s a #
Semigroup s => Extend (ReifiedGetter s)
Instance details Defined in Control.Lens.Reified Methods duplicated :: ReifiedGetter s a -> ReifiedGetter s (ReifiedGetter s a) # extended :: (ReifiedGetter s a -> b) -> ReifiedGetter s a -> ReifiedGetter s b #
Category ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods id :: forall (a :: k). ReifiedGetter a a # (.) :: forall (b :: k) (c :: k) (a :: k). ReifiedGetter b c -> ReifiedGetter a b -> ReifiedGetter a c #
type Corep ReifiedGetter
Instance details Defined in Control.Lens.Reified type Corep ReifiedGetter = Identity
type Rep ReifiedGetter
Instance details Defined in Control.Lens.Reified type Rep ReifiedGetter = Identity

newtype ReifiedIndexedGetter i s a #

Reify an ReifiedIndexedGetter so it can be stored safely in a container.

Constructors

IndexedGetter
Fields runIndexedGetter :: IndexedGetter i s a

Instances

Instances details

Representable (ReifiedIndexedGetter i)
Instance details Defined in Control.Lens.Reified Associated Types type Rep (ReifiedIndexedGetter i) :: Type -> Type # Methods tabulate :: (d -> Rep (ReifiedIndexedGetter i) c) -> ReifiedIndexedGetter i d c #
Strong (ReifiedIndexedGetter i)
Instance details Defined in Control.Lens.Reified Methods first' :: ReifiedIndexedGetter i a b -> ReifiedIndexedGetter i (a, c) (b, c) # second' :: ReifiedIndexedGetter i a b -> ReifiedIndexedGetter i (c, a) (c, b) #
Profunctor (ReifiedIndexedGetter i)
Instance details Defined in Control.Lens.Reified Methods dimap :: (a -> b) -> (c -> d) -> ReifiedIndexedGetter i b c -> ReifiedIndexedGetter i a d # lmap :: (a -> b) -> ReifiedIndexedGetter i b c -> ReifiedIndexedGetter i a c # rmap :: (b -> c) -> ReifiedIndexedGetter i a b -> ReifiedIndexedGetter i a c # (#.) :: forall a b c q. Coercible c b => q b c -> ReifiedIndexedGetter i a b -> ReifiedIndexedGetter i a c # (.#) :: forall a b c q. Coercible b a => ReifiedIndexedGetter i b c -> q a b -> ReifiedIndexedGetter i a c #
Sieve (ReifiedIndexedGetter i) ((,) i)
Instance details Defined in Control.Lens.Reified Methods sieve :: ReifiedIndexedGetter i a b -> a -> (i, b) #
Functor (ReifiedIndexedGetter i s)
Instance details Defined in Control.Lens.Reified Methods fmap :: (a -> b) -> ReifiedIndexedGetter i s a -> ReifiedIndexedGetter i s b # (<$) :: a -> ReifiedIndexedGetter i s b -> ReifiedIndexedGetter i s a #
Semigroup i => Apply (ReifiedIndexedGetter i s)
Instance details Defined in Control.Lens.Reified Methods (<.>) :: ReifiedIndexedGetter i s (a -> b) -> ReifiedIndexedGetter i s a -> ReifiedIndexedGetter i s b # (.>) :: ReifiedIndexedGetter i s a -> ReifiedIndexedGetter i s b -> ReifiedIndexedGetter i s b # (<.) :: ReifiedIndexedGetter i s a -> ReifiedIndexedGetter i s b -> ReifiedIndexedGetter i s a # liftF2 :: (a -> b -> c) -> ReifiedIndexedGetter i s a -> ReifiedIndexedGetter i s b -> ReifiedIndexedGetter i s c #
type Rep (ReifiedIndexedGetter i)
Instance details Defined in Control.Lens.Reified type Rep (ReifiedIndexedGetter i) = (,) i

newtype ReifiedFold s a #

Reify a ReifiedFold so it can be stored safely in a container.

This can also be useful for creatively combining folds as ReifiedFold s is isomorphic to ReaderT s [] and provides similar instances.

>>> ("hello","world")^..runFold ((,) <$> Fold _2 <*> Fold both)
[("world","hello"),("world","world")]

Constructors

Fold
Fields runFold :: Fold s a

Instances

Instances details

Arrow ReifiedFold
Instance details Defined in Control.Lens.Reified Methods arr :: (b -> c) -> ReifiedFold b c # first :: ReifiedFold b c -> ReifiedFold (b, d) (c, d) # second :: ReifiedFold b c -> ReifiedFold (d, b) (d, c) # (***) :: ReifiedFold b c -> ReifiedFold b' c' -> ReifiedFold (b, b') (c, c') # (&&&) :: ReifiedFold b c -> ReifiedFold b c' -> ReifiedFold b (c, c') #
ArrowApply ReifiedFold
Instance details Defined in Control.Lens.Reified Methods app :: ReifiedFold (ReifiedFold b c, b) c #
ArrowChoice ReifiedFold
Instance details Defined in Control.Lens.Reified Methods left :: ReifiedFold b c -> ReifiedFold (Either b d) (Either c d) # right :: ReifiedFold b c -> ReifiedFold (Either d b) (Either d c) # (+++) :: ReifiedFold b c -> ReifiedFold b' c' -> ReifiedFold (Either b b') (Either c c') # (\|\|\|) :: ReifiedFold b d -> ReifiedFold c d -> ReifiedFold (Either b c) d #
Choice ReifiedFold
Instance details Defined in Control.Lens.Reified Methods left' :: ReifiedFold a b -> ReifiedFold (Either a c) (Either b c) # right' :: ReifiedFold a b -> ReifiedFold (Either c a) (Either c b) #
Representable ReifiedFold
Instance details Defined in Control.Lens.Reified Associated Types type Rep ReifiedFold :: Type -> Type # Methods tabulate :: (d -> Rep ReifiedFold c) -> ReifiedFold d c #
Strong ReifiedFold
Instance details Defined in Control.Lens.Reified Methods first' :: ReifiedFold a b -> ReifiedFold (a, c) (b, c) # second' :: ReifiedFold a b -> ReifiedFold (c, a) (c, b) #
Profunctor ReifiedFold
Instance details Defined in Control.Lens.Reified Methods dimap :: (a -> b) -> (c -> d) -> ReifiedFold b c -> ReifiedFold a d # lmap :: (a -> b) -> ReifiedFold b c -> ReifiedFold a c # rmap :: (b -> c) -> ReifiedFold a b -> ReifiedFold a c # (#.) :: forall a b c q. Coercible c b => q b c -> ReifiedFold a b -> ReifiedFold a c # (.#) :: forall a b c q. Coercible b a => ReifiedFold b c -> q a b -> ReifiedFold a c #
Sieve ReifiedFold []
Instance details Defined in Control.Lens.Reified Methods sieve :: ReifiedFold a b -> a -> [b] #
MonadReader s (ReifiedFold s)
Instance details Defined in Control.Lens.Reified Methods ask :: ReifiedFold s s # local :: (s -> s) -> ReifiedFold s a -> ReifiedFold s a # reader :: (s -> a) -> ReifiedFold s a #
Alternative (ReifiedFold s)
Instance details Defined in Control.Lens.Reified Methods empty :: ReifiedFold s a # (<\|>) :: ReifiedFold s a -> ReifiedFold s a -> ReifiedFold s a # some :: ReifiedFold s a -> ReifiedFold s [a] # many :: ReifiedFold s a -> ReifiedFold s [a] #
Applicative (ReifiedFold s)
Instance details Defined in Control.Lens.Reified Methods pure :: a -> ReifiedFold s a # (<>) :: ReifiedFold s (a -> b) -> ReifiedFold s a -> ReifiedFold s b # liftA2 :: (a -> b -> c) -> ReifiedFold s a -> ReifiedFold s b -> ReifiedFold s c # (>) :: ReifiedFold s a -> ReifiedFold s b -> ReifiedFold s b # (<*) :: ReifiedFold s a -> ReifiedFold s b -> ReifiedFold s a #
Functor (ReifiedFold s)
Instance details Defined in Control.Lens.Reified Methods fmap :: (a -> b) -> ReifiedFold s a -> ReifiedFold s b # (<$) :: a -> ReifiedFold s b -> ReifiedFold s a #
Monad (ReifiedFold s)
Instance details Defined in Control.Lens.Reified Methods (>>=) :: ReifiedFold s a -> (a -> ReifiedFold s b) -> ReifiedFold s b # (>>) :: ReifiedFold s a -> ReifiedFold s b -> ReifiedFold s b # return :: a -> ReifiedFold s a #
MonadPlus (ReifiedFold s)
Instance details Defined in Control.Lens.Reified Methods mzero :: ReifiedFold s a # mplus :: ReifiedFold s a -> ReifiedFold s a -> ReifiedFold s a #
Alt (ReifiedFold s)
Instance details Defined in Control.Lens.Reified Methods (<!>) :: ReifiedFold s a -> ReifiedFold s a -> ReifiedFold s a # some :: Applicative (ReifiedFold s) => ReifiedFold s a -> ReifiedFold s [a] # many :: Applicative (ReifiedFold s) => ReifiedFold s a -> ReifiedFold s [a] #
Apply (ReifiedFold s)
Instance details Defined in Control.Lens.Reified Methods (<.>) :: ReifiedFold s (a -> b) -> ReifiedFold s a -> ReifiedFold s b # (.>) :: ReifiedFold s a -> ReifiedFold s b -> ReifiedFold s b # (<.) :: ReifiedFold s a -> ReifiedFold s b -> ReifiedFold s a # liftF2 :: (a -> b -> c) -> ReifiedFold s a -> ReifiedFold s b -> ReifiedFold s c #
Bind (ReifiedFold s)
Instance details Defined in Control.Lens.Reified Methods (>>-) :: ReifiedFold s a -> (a -> ReifiedFold s b) -> ReifiedFold s b # join :: ReifiedFold s (ReifiedFold s a) -> ReifiedFold s a #
Plus (ReifiedFold s)
Instance details Defined in Control.Lens.Reified Methods zero :: ReifiedFold s a #
Category ReifiedFold
Instance details Defined in Control.Lens.Reified Methods id :: forall (a :: k). ReifiedFold a a # (.) :: forall (b :: k) (c :: k) (a :: k). ReifiedFold b c -> ReifiedFold a b -> ReifiedFold a c #
Monoid (ReifiedFold s a)
Instance details Defined in Control.Lens.Reified Methods mempty :: ReifiedFold s a # mappend :: ReifiedFold s a -> ReifiedFold s a -> ReifiedFold s a # mconcat :: [ReifiedFold s a] -> ReifiedFold s a #
Semigroup (ReifiedFold s a)
Instance details Defined in Control.Lens.Reified Methods (<>) :: ReifiedFold s a -> ReifiedFold s a -> ReifiedFold s a # sconcat :: NonEmpty (ReifiedFold s a) -> ReifiedFold s a # stimes :: Integral b => b -> ReifiedFold s a -> ReifiedFold s a #
type Rep ReifiedFold
Instance details Defined in Control.Lens.Reified type Rep ReifiedFold = []

newtype ReifiedIndexedFold i s a #

Constructors

IndexedFold
Fields runIndexedFold :: IndexedFold i s a

Instances

Instances details

Representable (ReifiedIndexedFold i)
Instance details Defined in Control.Lens.Reified Associated Types type Rep (ReifiedIndexedFold i) :: Type -> Type # Methods tabulate :: (d -> Rep (ReifiedIndexedFold i) c) -> ReifiedIndexedFold i d c #
Strong (ReifiedIndexedFold i)
Instance details Defined in Control.Lens.Reified Methods first' :: ReifiedIndexedFold i a b -> ReifiedIndexedFold i (a, c) (b, c) # second' :: ReifiedIndexedFold i a b -> ReifiedIndexedFold i (c, a) (c, b) #
Profunctor (ReifiedIndexedFold i)
Instance details Defined in Control.Lens.Reified Methods dimap :: (a -> b) -> (c -> d) -> ReifiedIndexedFold i b c -> ReifiedIndexedFold i a d # lmap :: (a -> b) -> ReifiedIndexedFold i b c -> ReifiedIndexedFold i a c # rmap :: (b -> c) -> ReifiedIndexedFold i a b -> ReifiedIndexedFold i a c # (#.) :: forall a b c q. Coercible c b => q b c -> ReifiedIndexedFold i a b -> ReifiedIndexedFold i a c # (.#) :: forall a b c q. Coercible b a => ReifiedIndexedFold i b c -> q a b -> ReifiedIndexedFold i a c #
Sieve (ReifiedIndexedFold i) (Compose [] ((,) i))
Instance details Defined in Control.Lens.Reified Methods sieve :: ReifiedIndexedFold i a b -> a -> Compose [] ((,) i) b #
Functor (ReifiedIndexedFold i s)
Instance details Defined in Control.Lens.Reified Methods fmap :: (a -> b) -> ReifiedIndexedFold i s a -> ReifiedIndexedFold i s b # (<$) :: a -> ReifiedIndexedFold i s b -> ReifiedIndexedFold i s a #
Alt (ReifiedIndexedFold i s)
Instance details Defined in Control.Lens.Reified Methods (<!>) :: ReifiedIndexedFold i s a -> ReifiedIndexedFold i s a -> ReifiedIndexedFold i s a # some :: Applicative (ReifiedIndexedFold i s) => ReifiedIndexedFold i s a -> ReifiedIndexedFold i s [a] # many :: Applicative (ReifiedIndexedFold i s) => ReifiedIndexedFold i s a -> ReifiedIndexedFold i s [a] #
Plus (ReifiedIndexedFold i s)
Instance details Defined in Control.Lens.Reified Methods zero :: ReifiedIndexedFold i s a #
Monoid (ReifiedIndexedFold i s a)
Instance details Defined in Control.Lens.Reified Methods mempty :: ReifiedIndexedFold i s a # mappend :: ReifiedIndexedFold i s a -> ReifiedIndexedFold i s a -> ReifiedIndexedFold i s a # mconcat :: [ReifiedIndexedFold i s a] -> ReifiedIndexedFold i s a #
Semigroup (ReifiedIndexedFold i s a)
Instance details Defined in Control.Lens.Reified Methods (<>) :: ReifiedIndexedFold i s a -> ReifiedIndexedFold i s a -> ReifiedIndexedFold i s a # sconcat :: NonEmpty (ReifiedIndexedFold i s a) -> ReifiedIndexedFold i s a # stimes :: Integral b => b -> ReifiedIndexedFold i s a -> ReifiedIndexedFold i s a #
type Rep (ReifiedIndexedFold i)
Instance details Defined in Control.Lens.Reified type Rep (ReifiedIndexedFold i) = Compose [] ((,) i)

newtype ReifiedSetter s t a b #

Reify a ReifiedSetter so it can be stored safely in a container.

Constructors

Setter
Fields runSetter :: Setter s t a b

type ReifiedSetter' s a = ReifiedSetter s s a a #

type ReifiedSetter' = Simple ReifiedSetter

newtype ReifiedIndexedSetter i s t a b #

Reify an ReifiedIndexedSetter so it can be stored safely in a container.

Constructors

IndexedSetter
Fields runIndexedSetter :: IndexedSetter i s t a b

type ReifiedIndexedSetter' i s a = ReifiedIndexedSetter i s s a a #

type ReifiedIndexedSetter' i = Simple (ReifiedIndexedSetter i)

newtype ReifiedIso s t a b #

Reify an ReifiedIso so it can be stored safely in a container.

Constructors

Iso
Fields runIso :: Iso s t a b

type ReifiedIso' s a = ReifiedIso s s a a #

type ReifiedIso' = Simple ReifiedIso

newtype ReifiedPrism s t a b #

Reify a ReifiedPrism so it can be stored safely in a container.

Constructors

Prism
Fields runPrism :: Prism s t a b

type ReifiedPrism' s a = ReifiedPrism s s a a #

type ReifiedPrism' = Simple ReifiedPrism

ilevels :: forall (f :: Type -> Type) i s t a b j. Applicative f => Traversing (Indexed i) f s t a b -> IndexedLensLike Int f s t (Level i a) (Level j b) #

This provides a breadth-first Traversal or Fold of the individual levels of any other Traversal or Fold via iterative deepening depth-first search. The levels are returned to you in a compressed format.

This is similar to levels, but retains the index of the original IndexedTraversal, so you can access it when traversing the levels later on.

>>> ["dog","cat"]^@..ilevels (traversed<.>traversed).itraversed
[((0,0),'d'),((0,1),'o'),((1,0),'c'),((0,2),'g'),((1,1),'a'),((1,2),'t')]

The resulting Traversal of the levels which is indexed by the depth of each Level.

>>> ["dog","cat"]^@..ilevels (traversed<.>traversed)<.>itraversed
[((2,(0,0)),'d'),((3,(0,1)),'o'),((3,(1,0)),'c'),((4,(0,2)),'g'),((4,(1,1)),'a'),((5,(1,2)),'t')]

ilevels :: IndexedTraversal i s t a b      -> IndexedTraversal Int s t (Level i a) (Level i b)
ilevels :: IndexedFold i s a               -> IndexedFold Int s (Level i a)

Note: Internally this is implemented by using an illegal Applicative, as it extracts information in an order that violates the Applicative laws.

sequenceByOf :: Traversal s t (f b) b -> (forall x. x -> f x) -> (forall x y. f (x -> y) -> f x -> f y) -> s -> f t #

Sequence a container using a specified Applicative.

This is like traverseBy where the Traversable instance can be specified by any Traversal

sequenceByOf traverse ≡ sequenceBy

traverseByOf :: Traversal s t a b -> (forall x. x -> f x) -> (forall x y. f (x -> y) -> f x -> f y) -> (a -> f b) -> s -> f t #

Traverse a container using a specified Applicative.

This is like traverseBy where the Traversable instance can be specified by any Traversal

traverseByOf traverse ≡ traverseBy

confusing :: Applicative f => LensLike (Curried (Yoneda f) (Yoneda f)) s t a b -> LensLike f s t a b #

Fuse a Traversal by reassociating all of the (<*>) operations to the left and fusing all of the fmap calls into one. This is particularly useful when constructing a Traversal using operations from GHC.Generics.

Given a pair of Traversals foo and bar,

confusing (foo.bar) = foo.bar

However, foo and bar are each going to use the Applicative they are given.

confusing exploits the Yoneda lemma to merge their separate uses of fmap into a single fmap. and it further exploits an interesting property of the right Kan lift (or Curried) to left associate all of the uses of (<*>) to make it possible to fuse together more fmaps.

This is particularly effective when the choice of functor f is unknown at compile time or when the Traversal foo.bar in the above description is recursive or complex enough to prevent inlining.

fusing is a version of this combinator suitable for fusing lenses.

confusing :: Traversal s t a b -> Traversal s t a b

deepOf :: (Conjoined p, Applicative f) => LensLike f s t s t -> Traversing p f s t a b -> Over p f s t a b #

Try the second traversal. If it returns no entries, try again with all entries from the first traversal, recursively.

deepOf :: Fold s s          -> Fold s a                   -> Fold s a
deepOf :: Traversal' s s    -> Traversal' s a             -> Traversal' s a
deepOf :: Traversal s t s t -> Traversal s t a b          -> Traversal s t a b
deepOf :: Fold s s          -> IndexedFold i s a          -> IndexedFold i s a
deepOf :: Traversal s t s t -> IndexedTraversal i s t a b -> IndexedTraversal i s t a b

failing :: (Conjoined p, Applicative f) => Traversing p f s t a b -> Over p f s t a b -> Over p f s t a b infixl 5 #

Try the first Traversal (or Fold), falling back on the second Traversal (or Fold) if it returns no entries.

This is only a valid Traversal if the second Traversal is disjoint from the result of the first or returns exactly the same results. These conditions are trivially met when given a Lens, Iso, Getter, Prism or "affine" Traversal -- one that has 0 or 1 target.

Mutatis mutandis for Fold.

>>> [0,1,2,3] ^? failing (ix 1) (ix 2)
Just 1

>>> [0,1,2,3] ^? failing (ix 42) (ix 2)
Just 2

failing :: Traversal s t a b -> Traversal s t a b -> Traversal s t a b
failing :: Prism s t a b     -> Prism s t a b     -> Traversal s t a b
failing :: Fold s a          -> Fold s a          -> Fold s a

These cases are also supported, trivially, but are boring, because the left hand side always succeeds.

failing :: Lens s t a b      -> Traversal s t a b -> Traversal s t a b
failing :: Iso s t a b       -> Traversal s t a b -> Traversal s t a b
failing :: Equality s t a b  -> Traversal s t a b -> Traversal s t a b
failing :: Getter s a        -> Fold s a          -> Fold s a

If both of the inputs are indexed, the result is also indexed, so you can apply this to a pair of indexed traversals or indexed folds, obtaining an indexed traversal or indexed fold.

failing :: IndexedTraversal i s t a b -> IndexedTraversal i s t a b -> IndexedTraversal i s t a b
failing :: IndexedFold i s a          -> IndexedFold i s a          -> IndexedFold i s a

These cases are also supported, trivially, but are boring, because the left hand side always succeeds.

failing :: IndexedLens i s t a b      -> IndexedTraversal i s t a b -> IndexedTraversal i s t a b
failing :: IndexedGetter i s a        -> IndexedGetter i s a        -> IndexedFold i s a

ifailover :: Alternative m => Over (Indexed i) ((,) Any) s t a b -> (i -> a -> b) -> s -> m t #

Try to map a function which uses the index over this IndexedTraversal, failing if the IndexedTraversal has no targets.

ifailover :: Alternative m => IndexedTraversal i s t a b -> (i -> a -> b) -> s -> m t

failover :: Alternative m => LensLike ((,) Any) s t a b -> (a -> b) -> s -> m t #

Try to map a function over this Traversal, failing if the Traversal has no targets.

>>> failover (element 3) (*2) [1,2] :: Maybe [Int]
Nothing

>>> failover _Left (*2) (Right 4) :: Maybe (Either Int Int)
Nothing

>>> failover _Right (*2) (Right 4) :: Maybe (Either Int Int)
Just (Right 8)

failover :: Alternative m => Traversal s t a b -> (a -> b) -> s -> m t

elements :: forall (t :: Type -> Type) a. Traversable t => (Int -> Bool) -> IndexedTraversal' Int (t a) a #

Traverse elements of a Traversable container where their ordinal positions match a predicate.

elements ≡ elementsOf traverse

elementsOf :: forall (f :: Type -> Type) s t a. Applicative f => LensLike (Indexing f) s t a a -> (Int -> Bool) -> IndexedLensLike Int f s t a a #

Traverse (or fold) selected elements of a Traversal (or Fold) where their ordinal positions match a predicate.

elementsOf :: Traversal' s a -> (Int -> Bool) -> IndexedTraversal' Int s a
elementsOf :: Fold s a       -> (Int -> Bool) -> IndexedFold Int s a

element :: forall (t :: Type -> Type) a. Traversable t => Int -> IndexedTraversal' Int (t a) a #

Traverse the nth element of a Traversable container.

element ≡ elementOf traverse

elementOf :: forall (f :: Type -> Type) s t a. Applicative f => LensLike (Indexing f) s t a a -> Int -> IndexedLensLike Int f s t a a #

Traverse the nth elementOf a Traversal, Lens or Iso if it exists.

>>> [[1],[3,4]] & elementOf (traverse.traverse) 1 .~ 5
[[1],[5,4]]

>>> [[1],[3,4]] ^? elementOf (folded.folded) 1
Just 3

>>> timingOut $ ['a'..] ^?! elementOf folded 5
'f'

>>> timingOut $ take 10 $ elementOf traverse 3 .~ 16 $ [0..]
[0,1,2,16,4,5,6,7,8,9]

elementOf :: Traversal' s a -> Int -> IndexedTraversal' Int s a
elementOf :: Fold s a       -> Int -> IndexedFold Int s a

ignored :: Applicative f => pafb -> s -> f s #

This is the trivial empty Traversal.

ignored :: IndexedTraversal i s s a b

ignored ≡ const pure

>>> 6 & ignored %~ absurd
6

traversed64 :: forall (f :: Type -> Type) a b. Traversable f => IndexedTraversal Int64 (f a) (f b) a b #

Traverse any Traversable container. This is an IndexedTraversal that is indexed by ordinal position.

traversed1 :: forall (f :: TYPE LiftedRep -> Type) a b. Traversable1 f => IndexedTraversal1 Int (f a) (f b) a b #

Traverse any Traversable1 container. This is an IndexedTraversal1 that is indexed by ordinal position.

traversed :: forall (f :: Type -> Type) a b. Traversable f => IndexedTraversal Int (f a) (f b) a b #

Traverse any Traversable container. This is an IndexedTraversal that is indexed by ordinal position.

imapAccumLOf :: Over (Indexed i) (State acc) s t a b -> (i -> acc -> a -> (acc, b)) -> acc -> s -> (acc, t) #

Generalizes mapAccumL to an arbitrary IndexedTraversal with access to the index.

imapAccumLOf accumulates state from left to right.

mapAccumLOf l ≡ imapAccumLOf l . const

imapAccumLOf :: IndexedLens i s t a b      -> (i -> acc -> a -> (acc, b)) -> acc -> s -> (acc, t)
imapAccumLOf :: IndexedTraversal i s t a b -> (i -> acc -> a -> (acc, b)) -> acc -> s -> (acc, t)

imapAccumROf :: Over (Indexed i) (Backwards (State acc)) s t a b -> (i -> acc -> a -> (acc, b)) -> acc -> s -> (acc, t) #

Generalizes mapAccumR to an arbitrary IndexedTraversal with access to the index.

imapAccumROf accumulates state from right to left.

mapAccumROf l ≡ imapAccumROf l . const

imapAccumROf :: IndexedLens i s t a b      -> (i -> acc -> a -> (acc, b)) -> acc -> s -> (acc, t)
imapAccumROf :: IndexedTraversal i s t a b -> (i -> acc -> a -> (acc, b)) -> acc -> s -> (acc, t)

iforMOf :: (Indexed i a (WrappedMonad m b) -> s -> WrappedMonad m t) -> s -> (i -> a -> m b) -> m t #

Map each element of a structure targeted by a Lens to a monadic action, evaluate these actions from left to right, and collect the results, with access its position (and the arguments flipped).

forMOf l a ≡ iforMOf l a . const
iforMOf ≡ flip . imapMOf

iforMOf :: Monad m => IndexedLens i s t a b      -> s -> (i -> a -> m b) -> m t
iforMOf :: Monad m => IndexedTraversal i s t a b -> s -> (i -> a -> m b) -> m t

imapMOf :: Over (Indexed i) (WrappedMonad m) s t a b -> (i -> a -> m b) -> s -> m t #

Map each element of a structure targeted by a Lens to a monadic action, evaluate these actions from left to right, and collect the results, with access its position.

When you don't need access to the index mapMOf is more liberal in what it can accept.

mapMOf l ≡ imapMOf l . const

imapMOf :: Monad m => IndexedLens       i s t a b -> (i -> a -> m b) -> s -> m t
imapMOf :: Monad m => IndexedTraversal  i s t a b -> (i -> a -> m b) -> s -> m t
imapMOf :: Bind  m => IndexedTraversal1 i s t a b -> (i -> a -> m b) -> s -> m t

iforOf :: (Indexed i a (f b) -> s -> f t) -> s -> (i -> a -> f b) -> f t #

Traverse with an index (and the arguments flipped).

forOf l a ≡ iforOf l a . const
iforOf ≡ flip . itraverseOf

iforOf :: Functor f     => IndexedLens i s t a b       -> s -> (i -> a -> f b) -> f t
iforOf :: Applicative f => IndexedTraversal i s t a b  -> s -> (i -> a -> f b) -> f t
iforOf :: Apply f       => IndexedTraversal1 i s t a b -> s -> (i -> a -> f b) -> f t

itraverseOf :: (Indexed i a (f b) -> s -> f t) -> (i -> a -> f b) -> s -> f t #

Traversal with an index.

NB: When you don't need access to the index then you can just apply your IndexedTraversal directly as a function!

itraverseOf ≡ withIndex
traverseOf l = itraverseOf l . const = id

itraverseOf :: Functor f     => IndexedLens i s t a b       -> (i -> a -> f b) -> s -> f t
itraverseOf :: Applicative f => IndexedTraversal i s t a b  -> (i -> a -> f b) -> s -> f t
itraverseOf :: Apply f       => IndexedTraversal1 i s t a b -> (i -> a -> f b) -> s -> f t

cloneIndexedTraversal1 :: AnIndexedTraversal1 i s t a b -> IndexedTraversal1 i s t a b #

Clone an IndexedTraversal1 yielding an IndexedTraversal1 with the same index.

cloneIndexPreservingTraversal1 :: ATraversal1 s t a b -> IndexPreservingTraversal1 s t a b #

Clone a Traversal1 yielding an IndexPreservingTraversal1 that passes through whatever index it is composed with.

cloneTraversal1 :: ATraversal1 s t a b -> Traversal1 s t a b #

A Traversal1 is completely characterized by its behavior on a Bazaar1.

cloneIndexedTraversal :: AnIndexedTraversal i s t a b -> IndexedTraversal i s t a b #

Clone an IndexedTraversal yielding an IndexedTraversal with the same index.

cloneIndexPreservingTraversal :: ATraversal s t a b -> IndexPreservingTraversal s t a b #

Clone a Traversal yielding an IndexPreservingTraversal that passes through whatever index it is composed with.

cloneTraversal :: ATraversal s t a b -> Traversal s t a b #

A Traversal is completely characterized by its behavior on a Bazaar.

Cloning a Traversal is one way to make sure you aren't given something weaker, such as a Fold and can be used as a way to pass around traversals that have to be monomorphic in f.

Note: This only accepts a proper Traversal (or Lens). To clone a Lens as such, use cloneLens.

Note: It is usually better to use ReifiedTraversal and runTraversal than to cloneTraversal. The former can execute at full speed, while the latter needs to round trip through the Bazaar.

>>> let foo l a = (view (getting (cloneTraversal l)) a, set (cloneTraversal l) 10 a)
>>> foo both ("hello","world")
("helloworld",(10,10))

cloneTraversal :: LensLike (Bazaar (->) a b) s t a b -> Traversal s t a b

dropping :: (Conjoined p, Applicative f) => Int -> Over p (Indexing f) s t a a -> Over p f s t a a #

Visit all but the first n targets of a Traversal, Fold, Getter or Lens.

>>> ("hello","world") ^? dropping 1 both
Just "world"

Dropping works on infinite traversals as well:

>>> [1..] ^? dropping 1 folded
Just 2

dropping :: Int -> Traversal' s a                   -> Traversal' s a
dropping :: Int -> Lens' s a                        -> Traversal' s a
dropping :: Int -> Iso' s a                         -> Traversal' s a
dropping :: Int -> Prism' s a                       -> Traversal' s a
dropping :: Int -> Getter s a                       -> Fold s a
dropping :: Int -> Fold s a                         -> Fold s a
dropping :: Int -> IndexedTraversal' i s a          -> IndexedTraversal' i s a
dropping :: Int -> IndexedLens' i s a               -> IndexedTraversal' i s a
dropping :: Int -> IndexedGetter i s a              -> IndexedFold i s a
dropping :: Int -> IndexedFold i s a                -> IndexedFold i s a

taking :: (Conjoined p, Applicative f) => Int -> Traversing p f s t a a -> Over p f s t a a #

Visit the first n targets of a Traversal, Fold, Getter or Lens.

>>> [("hello","world"),("!!!","!!!")]^.. taking 2 (traverse.both)
["hello","world"]

>>> timingOut $ [1..] ^.. taking 3 traverse
[1,2,3]

>>> over (taking 5 traverse) succ "hello world"
"ifmmp world"

taking :: Int -> Traversal' s a                   -> Traversal' s a
taking :: Int -> Lens' s a                        -> Traversal' s a
taking :: Int -> Iso' s a                         -> Traversal' s a
taking :: Int -> Prism' s a                       -> Traversal' s a
taking :: Int -> Getter s a                       -> Fold s a
taking :: Int -> Fold s a                         -> Fold s a
taking :: Int -> IndexedTraversal' i s a          -> IndexedTraversal' i s a
taking :: Int -> IndexedLens' i s a               -> IndexedTraversal' i s a
taking :: Int -> IndexedGetter i s a              -> IndexedFold i s a
taking :: Int -> IndexedFold i s a                -> IndexedFold i s a

both1 :: forall (r :: TYPE LiftedRep -> TYPE LiftedRep -> Type) a b. Bitraversable1 r => Traversal1 (r a a) (r b b) a b #

Traverse both parts of a Bitraversable1 container with matching types.

Usually that type will be a pair.

both1 :: Traversal1 (a, a)       (b, b)       a b
both1 :: Traversal1 (Either a a) (Either b b) a b

both :: forall (r :: Type -> Type -> Type) a b. Bitraversable r => Traversal (r a a) (r b b) a b #

Traverse both parts of a Bitraversable container with matching types.

Usually that type will be a pair. Use each to traverse the elements of arbitrary homogeneous tuples.

>>> (1,2) & both *~ 10
(10,20)

>>> over both length ("hello","world")
(5,5)

>>> ("hello","world")^.both
"helloworld"

both :: Traversal (a, a)       (b, b)       a b
both :: Traversal (Either a a) (Either b b) a b

holes1Of :: Conjoined p => Over p (Bazaar1 p a a) s t a a -> s -> NonEmpty (Pretext p a a t) #

The non-empty version of holesOf. This extract a non-empty list of immediate children according to a given Traversal1 as editable contexts.

>>> let head1 f s = runPretext (NonEmpty.head $ holes1Of traversed1 s) f
>>> ('a' :| "bc") ^. head1
'a'

>>> ('a' :| "bc") & head1 %~ toUpper
'A' :| "bc"

holes1Of :: Iso' s a                 -> s -> NonEmpty (Pretext' (->) a s)
holes1Of :: Lens' s a                -> s -> NonEmpty (Pretext' (->) a s)
holes1Of :: Traversal1' s a          -> s -> NonEmpty (Pretext' (->) a s)
holes1Of :: IndexedLens' i s a       -> s -> NonEmpty (Pretext' (Indexed i) a s)
holes1Of :: IndexedTraversal1' i s a -> s -> NonEmpty (Pretext' (Indexed i) a s)

holesOf :: Conjoined p => Over p (Bazaar p a a) s t a a -> s -> [Pretext p a a t] #

The one-level version of contextsOf. This extracts a list of the immediate children according to a given Traversal as editable contexts.

Given a context you can use pos to see the values, peek at what the structure would be like with an edited result, or simply extract the original structure.

propChildren l x = toListOf l x == map pos (holesOf l x)
propId l x = all (== x) [extract w | w <- holesOf l x]

holesOf :: Iso' s a                -> s -> [Pretext' (->) a s]
holesOf :: Lens' s a               -> s -> [Pretext' (->) a s]
holesOf :: Traversal' s a          -> s -> [Pretext' (->) a s]
holesOf :: IndexedLens' i s a      -> s -> [Pretext' (Indexed i) a s]
holesOf :: IndexedTraversal' i s a -> s -> [Pretext' (Indexed i) a s]

unsafeSingular :: (HasCallStack, Conjoined p, Functor f) => Traversing p f s t a b -> Over p f s t a b #

This converts a Traversal that you "know" will target only one element to a Lens. It can also be used to transform a Fold into a Getter.

The resulting Lens or Getter will be partial if the Traversal targets nothing or more than one element.

>>> Left (ErrorCall "unsafeSingular: empty traversal") <- try (evaluate ([] & unsafeSingular traverse .~ 0)) :: IO (Either ErrorCall [Integer])

unsafeSingular :: Traversal s t a b          -> Lens s t a b
unsafeSingular :: Fold s a                   -> Getter s a
unsafeSingular :: IndexedTraversal i s t a b -> IndexedLens i s t a b
unsafeSingular :: IndexedFold i s a          -> IndexedGetter i s a

iunsafePartsOf' :: forall i s t a b. Over (Indexed i) (Bazaar (Indexed i) a b) s t a b -> IndexedLens [i] s t [a] [b] #

unsafePartsOf' :: ATraversal s t a b -> Lens s t [a] [b] #

iunsafePartsOf :: (Indexable [i] p, Functor f) => Traversing (Indexed i) f s t a b -> Over p f s t [a] [b] #

An indexed version of unsafePartsOf that receives the entire list of indices as its index.

unsafePartsOf :: Functor f => Traversing (->) f s t a b -> LensLike f s t [a] [b] #

unsafePartsOf turns a Traversal into a uniplate (or biplate) family.

If you do not need the types of s and t to be different, it is recommended that you use partsOf.

It is generally safer to traverse with the Bazaar rather than use this combinator. However, it is sometimes convenient.

This is unsafe because if you don't supply at least as many b's as you were given a's, then the reconstruction of t will result in an error!

When applied to a Fold the result is merely a Getter (and becomes safe).

unsafePartsOf :: Iso s t a b       -> Lens s t [a] [b]
unsafePartsOf :: Lens s t a b      -> Lens s t [a] [b]
unsafePartsOf :: Traversal s t a b -> Lens s t [a] [b]
unsafePartsOf :: Fold s a          -> Getter s [a]
unsafePartsOf :: Getter s a        -> Getter s [a]

ipartsOf' :: forall i p f s t a. (Indexable [i] p, Functor f) => Over (Indexed i) (Bazaar' (Indexed i) a) s t a a -> Over p f s t [a] [a] #

A type-restricted version of ipartsOf that can only be used with an IndexedTraversal.

partsOf' :: ATraversal s t a a -> Lens s t [a] [a] #

A type-restricted version of partsOf that can only be used with a Traversal.

ipartsOf :: (Indexable [i] p, Functor f) => Traversing (Indexed i) f s t a a -> Over p f s t [a] [a] #

An indexed version of partsOf that receives the entire list of indices as its index.

partsOf :: Functor f => Traversing (->) f s t a a -> LensLike f s t [a] [a] #

partsOf turns a Traversal into a Lens that resembles an early version of the uniplate (or biplate) type.

Note: You should really try to maintain the invariant of the number of children in the list.

>>> (a,b,c) & partsOf each .~ [x,y,z]
(x,y,z)

Any extras will be lost. If you do not supply enough, then the remainder will come from the original structure.

>>> (a,b,c) & partsOf each .~ [w,x,y,z]
(w,x,y)

>>> (a,b,c) & partsOf each .~ [x,y]
(x,y,c)

>>> ('b', 'a', 'd', 'c') & partsOf each %~ sort
('a','b','c','d')

So technically, this is only a Lens if you do not change the number of results it returns.

When applied to a Fold the result is merely a Getter.

partsOf :: Iso' s a       -> Lens' s [a]
partsOf :: Lens' s a      -> Lens' s [a]
partsOf :: Traversal' s a -> Lens' s [a]
partsOf :: Fold s a       -> Getter s [a]
partsOf :: Getter s a     -> Getter s [a]

iloci :: IndexedTraversal i (Bazaar (Indexed i) a c s) (Bazaar (Indexed i) b c s) a b #

This IndexedTraversal allows you to traverse the individual stores in a Bazaar with access to their indices.

loci :: Traversal (Bazaar (->) a c s) (Bazaar (->) b c s) a b #

This Traversal allows you to traverse the individual stores in a Bazaar.

scanl1Of :: LensLike (State (Maybe a)) s t a a -> (a -> a -> a) -> s -> t #

This permits the use of scanl1 over an arbitrary Traversal or Lens.

scanl1 ≡ scanl1Of traverse

scanl1Of :: Iso s t a a       -> (a -> a -> a) -> s -> t
scanl1Of :: Lens s t a a      -> (a -> a -> a) -> s -> t
scanl1Of :: Traversal s t a a -> (a -> a -> a) -> s -> t

scanr1Of :: LensLike (Backwards (State (Maybe a))) s t a a -> (a -> a -> a) -> s -> t #

This permits the use of scanr1 over an arbitrary Traversal or Lens.

scanr1 ≡ scanr1Of traverse

scanr1Of :: Iso s t a a       -> (a -> a -> a) -> s -> t
scanr1Of :: Lens s t a a      -> (a -> a -> a) -> s -> t
scanr1Of :: Traversal s t a a -> (a -> a -> a) -> s -> t

mapAccumLOf :: LensLike (State acc) s t a b -> (acc -> a -> (acc, b)) -> acc -> s -> (acc, t) #

This generalizes mapAccumL to an arbitrary Traversal.

mapAccumL ≡ mapAccumLOf traverse

mapAccumLOf accumulates State from left to right.

mapAccumLOf :: Iso s t a b       -> (acc -> a -> (acc, b)) -> acc -> s -> (acc, t)
mapAccumLOf :: Lens s t a b      -> (acc -> a -> (acc, b)) -> acc -> s -> (acc, t)
mapAccumLOf :: Traversal s t a b -> (acc -> a -> (acc, b)) -> acc -> s -> (acc, t)

mapAccumLOf :: LensLike (State acc) s t a b -> (acc -> a -> (acc, b)) -> acc -> s -> (acc, t)
mapAccumLOf l f acc0 s = swap (runState (l (a -> state (acc -> swap (f acc a))) s) acc0)

mapAccumROf :: LensLike (Backwards (State acc)) s t a b -> (acc -> a -> (acc, b)) -> acc -> s -> (acc, t) #

This generalizes mapAccumR to an arbitrary Traversal.

mapAccumR ≡ mapAccumROf traverse

mapAccumROf accumulates State from right to left.

mapAccumROf :: Iso s t a b       -> (acc -> a -> (acc, b)) -> acc -> s -> (acc, t)
mapAccumROf :: Lens s t a b      -> (acc -> a -> (acc, b)) -> acc -> s -> (acc, t)
mapAccumROf :: Traversal s t a b -> (acc -> a -> (acc, b)) -> acc -> s -> (acc, t)

mapAccumROf :: LensLike (Backwards (State acc)) s t a b -> (acc -> a -> (acc, b)) -> acc -> s -> (acc, t)

transposeOf :: LensLike ZipList s t [a] a -> s -> [t] #

This generalizes transpose to an arbitrary Traversal.

Note: transpose handles ragged inputs more intelligently, but for non-ragged inputs:

>>> transposeOf traverse [[1,2,3],[4,5,6]]
[[1,4],[2,5],[3,6]]

transpose ≡ transposeOf traverse

Since every Lens is a Traversal, we can use this as a form of monadic strength as well:

transposeOf _2 :: (b, [a]) -> [(b, a)]

sequenceOf :: LensLike (WrappedMonad m) s t (m b) b -> s -> m t #

Sequence the (monadic) effects targeted by a Lens in a container from left to right.

>>> sequenceOf each ([1,2],[3,4],[5,6])
[(1,3,5),(1,3,6),(1,4,5),(1,4,6),(2,3,5),(2,3,6),(2,4,5),(2,4,6)]

sequence ≡ sequenceOf traverse
sequenceOf l ≡ mapMOf l id
sequenceOf l ≡ unwrapMonad . l WrapMonad

sequenceOf :: Monad m => Iso s t (m b) b       -> s -> m t
sequenceOf :: Monad m => Lens s t (m b) b      -> s -> m t
sequenceOf :: Monad m => Traversal s t (m b) b -> s -> m t

forMOf :: LensLike (WrappedMonad m) s t a b -> s -> (a -> m b) -> m t #

forMOf is a flipped version of mapMOf, consistent with the definition of forM.

>>> forMOf both (1,3) $ \x -> [x, x + 1]
[(1,3),(1,4),(2,3),(2,4)]

forM ≡ forMOf traverse
forMOf l ≡ flip (mapMOf l)
iforMOf l s ≡ forM l s . Indexed

forMOf :: Monad m => Iso s t a b       -> s -> (a -> m b) -> m t
forMOf :: Monad m => Lens s t a b      -> s -> (a -> m b) -> m t
forMOf :: Monad m => Traversal s t a b -> s -> (a -> m b) -> m t

mapMOf :: LensLike (WrappedMonad m) s t a b -> (a -> m b) -> s -> m t #

Map each element of a structure targeted by a Lens to a monadic action, evaluate these actions from left to right, and collect the results.

>>> mapMOf both (\x -> [x, x + 1]) (1,3)
[(1,3),(1,4),(2,3),(2,4)]

mapM ≡ mapMOf traverse
imapMOf l ≡ forM l . Indexed

mapMOf :: Monad m => Iso s t a b       -> (a -> m b) -> s -> m t
mapMOf :: Monad m => Lens s t a b      -> (a -> m b) -> s -> m t
mapMOf :: Monad m => Traversal s t a b -> (a -> m b) -> s -> m t

sequenceAOf :: LensLike f s t (f b) b -> s -> f t #

Evaluate each action in the structure from left to right, and collect the results.

>>> sequenceAOf both ([1,2],[3,4])
[(1,3),(1,4),(2,3),(2,4)]

sequenceA ≡ sequenceAOf traverse ≡ traverse id
sequenceAOf l ≡ traverseOf l id ≡ l id

sequenceAOf :: Functor f => Iso s t (f b) b       -> s -> f t
sequenceAOf :: Functor f => Lens s t (f b) b      -> s -> f t
sequenceAOf :: Applicative f => Traversal s t (f b) b -> s -> f t

forOf :: LensLike f s t a b -> s -> (a -> f b) -> f t #

A version of traverseOf with the arguments flipped, such that:

>>> forOf each (1,2,3) print
1
2
3
((),(),())

This function is only provided for consistency, flip is strictly more general.

forOf ≡ flip
forOf ≡ flip . traverseOf

for ≡ forOf traverse
ifor l s ≡ for l s . Indexed

forOf :: Functor f => Iso s t a b -> s -> (a -> f b) -> f t
forOf :: Functor f => Lens s t a b -> s -> (a -> f b) -> f t
forOf :: Applicative f => Traversal s t a b -> s -> (a -> f b) -> f t

traverseOf :: LensLike f s t a b -> (a -> f b) -> s -> f t #

Map each element of a structure targeted by a Lens or Traversal, evaluate these actions from left to right, and collect the results.

This function is only provided for consistency, id is strictly more general.

>>> traverseOf each print (1,2,3)
1
2
3
((),(),())

traverseOf ≡ id
itraverseOf l ≡ traverseOf l . Indexed
itraverseOf itraversed ≡ itraverse

This yields the obvious law:

traverse ≡ traverseOf traverse

traverseOf :: Functor f     => Iso s t a b        -> (a -> f b) -> s -> f t
traverseOf :: Functor f     => Lens s t a b       -> (a -> f b) -> s -> f t
traverseOf :: Apply f       => Traversal1 s t a b -> (a -> f b) -> s -> f t
traverseOf :: Applicative f => Traversal s t a b  -> (a -> f b) -> s -> f t

traversal :: ((a -> f b) -> s -> f t) -> LensLike f s t a b #

Build a Traversal by providing a function which specifies the elements you wish to focus.

The caller provides a function of type:

Applicative f => (a -> f b) -> s -> f t

Which is a higher order function which accepts a "focusing function" and applies it to all desired focuses within s, then constructs a t using the Applicative instance of f.

Only elements which are "focused" using the focusing function will be targeted by the resulting traversal.

For example, we can explicitly write a traversal which targets the first and third elements of a tuple like this:

firstAndThird :: Traversal (a, x, a) (b, x, b) a b
firstAndThird = traversal go
  where
    go :: Applicative f => (a -> f b) -> (a, x, a) -> f (b, x, b)
    go focus (a, x, a') = liftA3 (,,) (focus a) (pure x) (focus a')

>>> (1,"two",3) & firstAndThird *~ 10
(10,"two",30)

>>> over firstAndThird length ("one",2,"three")
(3,2,5)

We can re-use existing Traversals when writing new ones by passing our focusing function along to them. This example re-uses traverse to focus all elements in a list which is embedded in a tuple. This traversal could also be written simply as _2 . traverse.

selectNested :: Traversal (x, [a]) (x, [b]) a b
selectNested = traversal go
  where
    go :: Applicative f => (a -> f b) -> (x, [a]) -> f (x, [b])
    go focus (x, as) = liftA2 (,) (pure x) (traverse focus as)

>>> selectNested .~ "hello" $ (1,[2,3,4,5])
(1,["hello","hello","hello","hello"])

>>> (1,[2,3,4,5]) & selectNested *~ 3
(1,[6,9,12,15])

Note that the traversal function actually just returns the same function you pass to it. The function it accepts is in fact a valid traversal all on its own! The use of traversal does nothing except verify that the function it is passed matches the signature of a valid traversal. One could remove the traversal combinator from either of the last two examples and use the definition of go directly with no change in behaviour.

This function exists for consistency with the lens, prism and iso constructors as well as to serve as a touchpoint for beginners who wish to construct their own traversals but are uncertain how to do so.

type ATraversal s t a b = LensLike (Bazaar (->) a b) s t a b #

When you see this as an argument to a function, it expects a Traversal.

type ATraversal' s a = ATraversal s s a a #

type ATraversal' = Simple ATraversal

type ATraversal1 s t a b = LensLike (Bazaar1 (->) a b) s t a b #

When you see this as an argument to a function, it expects a Traversal1.

type ATraversal1' s a = ATraversal1 s s a a #

type ATraversal1' = Simple ATraversal1

type AnIndexedTraversal i s t a b = Over (Indexed i) (Bazaar (Indexed i) a b) s t a b #

When you see this as an argument to a function, it expects an IndexedTraversal.

type AnIndexedTraversal1 i s t a b = Over (Indexed i) (Bazaar1 (Indexed i) a b) s t a b #

When you see this as an argument to a function, it expects an IndexedTraversal1.

type AnIndexedTraversal' i s a = AnIndexedTraversal i s s a a #

type AnIndexedTraversal' = Simple (AnIndexedTraversal i)

type AnIndexedTraversal1' i s a = AnIndexedTraversal1 i s s a a #

type AnIndexedTraversal1' = Simple (AnIndexedTraversal1 i)

type Traversing (p :: Type -> Type -> Type) (f :: Type -> Type) s t a b = Over p (BazaarT p f a b) s t a b #

When you see this as an argument to a function, it expects

to be indexed if p is an instance of Indexed i,
to be unindexed if p is (->),
a Traversal if f is Applicative,
a Getter if f is only a Functor and Contravariant,
a Lens if f is only a Functor,
a Fold if f is Applicative and Contravariant.

type Traversing1 (p :: Type -> Type -> Type) (f :: Type -> Type) s t a b = Over p (BazaarT1 p f a b) s t a b #

type Traversing' (p :: Type -> Type -> Type) (f :: Type -> Type) s a = Traversing p f s s a a #

type Traversing' f = Simple (Traversing f)

type Traversing1' (p :: Type -> Type -> Type) (f :: Type -> Type) s a = Traversing1 p f s s a a #

class Ord k => TraverseMin k (m :: Type -> Type) | m -> k where #

Allows IndexedTraversal the value at the smallest index.

Methods

traverseMin :: IndexedTraversal' k (m v) v #

IndexedTraversal of the element with the smallest index.

Instances

Instances details

TraverseMin Int IntMap
Instance details Defined in Control.Lens.Traversal Methods traverseMin :: IndexedTraversal' Int (IntMap v) v #
Ord k => TraverseMin k (Map k)
Instance details Defined in Control.Lens.Traversal Methods traverseMin :: IndexedTraversal' k (Map k v) v #

class Ord k => TraverseMax k (m :: Type -> Type) | m -> k where #

Allows IndexedTraversal of the value at the largest index.

Methods

traverseMax :: IndexedTraversal' k (m v) v #

IndexedTraversal of the element at the largest index.

Instances

Instances details

TraverseMax Int IntMap
Instance details Defined in Control.Lens.Traversal Methods traverseMax :: IndexedTraversal' Int (IntMap v) v #
Ord k => TraverseMax k (Map k)
Instance details Defined in Control.Lens.Traversal Methods traverseMax :: IndexedTraversal' k (Map k v) v #

foldMapByOf :: Fold s a -> (r -> r -> r) -> r -> (a -> r) -> s -> r #

Fold a value using a specified Fold and Monoid operations. This is like foldMapBy where the Foldable instance can be manually specified.

foldMapByOf folded ≡ foldMapBy

foldMapByOf :: Getter s a     -> (r -> r -> r) -> r -> (a -> r) -> s -> r
foldMapByOf :: Fold s a       -> (r -> r -> r) -> r -> (a -> r) -> s -> r
foldMapByOf :: Traversal' s a -> (r -> r -> r) -> r -> (a -> r) -> s -> r
foldMapByOf :: Lens' s a      -> (r -> r -> r) -> r -> (a -> r) -> s -> r
foldMapByOf :: Iso' s a       -> (r -> r -> r) -> r -> (a -> r) -> s -> r

>>> foldMapByOf both (+) 0 length ("hello","world")
10

foldByOf :: Fold s a -> (a -> a -> a) -> a -> s -> a #

Fold a value using a specified Fold and Monoid operations. This is like foldBy where the Foldable instance can be manually specified.

foldByOf folded ≡ foldBy

foldByOf :: Getter s a     -> (a -> a -> a) -> a -> s -> a
foldByOf :: Fold s a       -> (a -> a -> a) -> a -> s -> a
foldByOf :: Lens' s a      -> (a -> a -> a) -> a -> s -> a
foldByOf :: Traversal' s a -> (a -> a -> a) -> a -> s -> a
foldByOf :: Iso' s a       -> (a -> a -> a) -> a -> s -> a

>>> foldByOf both (++) [] ("hello","world")
"helloworld"

idroppingWhile :: (Indexable i p, Profunctor q, Applicative f) => (i -> a -> Bool) -> Optical (Indexed i) q (Compose (State Bool) f) s t a a -> Optical p q f s t a a #

Obtain an IndexedFold by dropping elements from another IndexedFold, IndexedLens, IndexedGetter or IndexedTraversal while a predicate holds.

idroppingWhile :: (i -> a -> Bool) -> IndexedFold i s a          -> IndexedFold i s a
idroppingWhile :: (i -> a -> Bool) -> IndexedTraversal' i s a    -> IndexedFold i s a -- see notes
idroppingWhile :: (i -> a -> Bool) -> IndexedLens' i s a         -> IndexedFold i s a -- see notes
idroppingWhile :: (i -> a -> Bool) -> IndexedGetter i s a        -> IndexedFold i s a

Note: As with droppingWhile applying idroppingWhile to an IndexedLens or IndexedTraversal will still allow you to use it as a pseudo-IndexedTraversal, but if you change the value of the first target to one where the predicate returns True, then you will break the Traversal laws and Traversal fusion will no longer be sound.

itakingWhile :: (Indexable i p, Profunctor q, Contravariant f, Applicative f) => (i -> a -> Bool) -> Optical' (Indexed i) q (Const (Endo (f s)) :: Type -> Type) s a -> Optical' p q f s a #

Obtain an IndexedFold by taking elements from another IndexedFold, IndexedLens, IndexedGetter or IndexedTraversal while a predicate holds.

itakingWhile :: (i -> a -> Bool) -> IndexedFold i s a          -> IndexedFold i s a
itakingWhile :: (i -> a -> Bool) -> IndexedTraversal' i s a    -> IndexedFold i s a
itakingWhile :: (i -> a -> Bool) -> IndexedLens' i s a         -> IndexedFold i s a
itakingWhile :: (i -> a -> Bool) -> IndexedGetter i s a        -> IndexedFold i s a

Note: Applying itakingWhile to an IndexedLens or IndexedTraversal will still allow you to use it as a pseudo-IndexedTraversal, but if you change the value of any target to one where the predicate returns False, then you will break the Traversal laws and Traversal fusion will no longer be sound.

ifiltered :: (Indexable i p, Applicative f) => (i -> a -> Bool) -> Optical' p (Indexed i) f a a #

Filter an IndexedFold or IndexedGetter, obtaining an IndexedFold.

>>> [0,0,0,5,5,5]^..traversed.ifiltered (\i a -> i <= a)
[0,5,5,5]

Compose with ifiltered to filter another IndexedLens, IndexedIso, IndexedGetter, IndexedFold (or IndexedTraversal) with access to both the value and the index.

Note: As with filtered, this is not a legal IndexedTraversal, unless you are very careful not to invalidate the predicate on the target!

findIndicesOf :: IndexedGetting i (Endo [i]) s a -> (a -> Bool) -> s -> [i] #

Retrieve the indices of the values targeted by a IndexedFold or IndexedTraversal which satisfy a predicate.

findIndices ≡ findIndicesOf folded

findIndicesOf :: IndexedFold i s a       -> (a -> Bool) -> s -> [i]
findIndicesOf :: IndexedTraversal' i s a -> (a -> Bool) -> s -> [i]

findIndexOf :: IndexedGetting i (First i) s a -> (a -> Bool) -> s -> Maybe i #

Retrieve the index of the first value targeted by a IndexedFold or IndexedTraversal which satisfies a predicate.

findIndex ≡ findIndexOf folded

findIndexOf :: IndexedFold i s a       -> (a -> Bool) -> s -> Maybe i
findIndexOf :: IndexedTraversal' i s a -> (a -> Bool) -> s -> Maybe i

elemIndicesOf :: Eq a => IndexedGetting i (Endo [i]) s a -> a -> s -> [i] #

Retrieve the indices of the values targeted by a IndexedFold or IndexedTraversal which are equal to a given value.

elemIndices ≡ elemIndicesOf folded

elemIndicesOf :: Eq a => IndexedFold i s a       -> a -> s -> [i]
elemIndicesOf :: Eq a => IndexedTraversal' i s a -> a -> s -> [i]

elemIndexOf :: Eq a => IndexedGetting i (First i) s a -> a -> s -> Maybe i #

Retrieve the index of the first value targeted by a IndexedFold or IndexedTraversal which is equal to a given value.

elemIndex ≡ elemIndexOf folded

elemIndexOf :: Eq a => IndexedFold i s a       -> a -> s -> Maybe i
elemIndexOf :: Eq a => IndexedTraversal' i s a -> a -> s -> Maybe i

(^@?!) :: HasCallStack => s -> IndexedGetting i (Endo (i, a)) s a -> (i, a) infixl 8 #

Perform an *UNSAFE* head (with index) of an IndexedFold or IndexedTraversal assuming that it is there.

(^@?!) :: s -> IndexedGetter i s a     -> (i, a)
(^@?!) :: s -> IndexedFold i s a       -> (i, a)
(^@?!) :: s -> IndexedLens' i s a      -> (i, a)
(^@?!) :: s -> IndexedTraversal' i s a -> (i, a)

(^@?) :: s -> IndexedGetting i (Endo (Maybe (i, a))) s a -> Maybe (i, a) infixl 8 #

Perform a safe head (with index) of an IndexedFold or IndexedTraversal or retrieve Just the index and result from an IndexedGetter or IndexedLens.

When using a IndexedTraversal as a partial IndexedLens, or an IndexedFold as a partial IndexedGetter this can be a convenient way to extract the optional value.

(^@?) :: s -> IndexedGetter i s a     -> Maybe (i, a)
(^@?) :: s -> IndexedFold i s a       -> Maybe (i, a)
(^@?) :: s -> IndexedLens' i s a      -> Maybe (i, a)
(^@?) :: s -> IndexedTraversal' i s a -> Maybe (i, a)

(^@..) :: s -> IndexedGetting i (Endo [(i, a)]) s a -> [(i, a)] infixl 8 #

An infix version of itoListOf.

itoListOf :: IndexedGetting i (Endo [(i, a)]) s a -> s -> [(i, a)] #

Extract the key-value pairs from a structure.

When you don't need access to the indices in the result, then toListOf is more flexible in what it accepts.

toListOf l ≡ map snd . itoListOf l

itoListOf :: IndexedGetter i s a     -> s -> [(i,a)]
itoListOf :: IndexedFold i s a       -> s -> [(i,a)]
itoListOf :: IndexedLens' i s a      -> s -> [(i,a)]
itoListOf :: IndexedTraversal' i s a -> s -> [(i,a)]

ifoldlMOf :: Monad m => IndexedGetting i (Endo (r -> m r)) s a -> (i -> r -> a -> m r) -> r -> s -> m r #

Monadic fold over the elements of a structure with an index, associating to the left.

When you don't need access to the index then foldlMOf is more flexible in what it accepts.

foldlMOf l ≡ ifoldlMOf l . const

ifoldlMOf :: Monad m => IndexedGetter i s a     -> (i -> r -> a -> m r) -> r -> s -> m r
ifoldlMOf :: Monad m => IndexedFold i s a       -> (i -> r -> a -> m r) -> r -> s -> m r
ifoldlMOf :: Monad m => IndexedLens' i s a      -> (i -> r -> a -> m r) -> r -> s -> m r
ifoldlMOf :: Monad m => IndexedTraversal' i s a -> (i -> r -> a -> m r) -> r -> s -> m r

ifoldrMOf :: Monad m => IndexedGetting i (Dual (Endo (r -> m r))) s a -> (i -> a -> r -> m r) -> r -> s -> m r #

Monadic fold right over the elements of a structure with an index.

When you don't need access to the index then foldrMOf is more flexible in what it accepts.

foldrMOf l ≡ ifoldrMOf l . const

ifoldrMOf :: Monad m => IndexedGetter i s a     -> (i -> a -> r -> m r) -> r -> s -> m r
ifoldrMOf :: Monad m => IndexedFold i s a       -> (i -> a -> r -> m r) -> r -> s -> m r
ifoldrMOf :: Monad m => IndexedLens' i s a      -> (i -> a -> r -> m r) -> r -> s -> m r
ifoldrMOf :: Monad m => IndexedTraversal' i s a -> (i -> a -> r -> m r) -> r -> s -> m r

ifoldlOf' :: IndexedGetting i (Endo (r -> r)) s a -> (i -> r -> a -> r) -> r -> s -> r #

Fold over the elements of a structure with an index, associating to the left, but strictly.

When you don't need access to the index then foldlOf' is more flexible in what it accepts.

foldlOf' l ≡ ifoldlOf' l . const

ifoldlOf' :: IndexedGetter i s a       -> (i -> r -> a -> r) -> r -> s -> r
ifoldlOf' :: IndexedFold i s a         -> (i -> r -> a -> r) -> r -> s -> r
ifoldlOf' :: IndexedLens' i s a        -> (i -> r -> a -> r) -> r -> s -> r
ifoldlOf' :: IndexedTraversal' i s a   -> (i -> r -> a -> r) -> r -> s -> r

ifoldrOf' :: IndexedGetting i (Dual (Endo (r -> r))) s a -> (i -> a -> r -> r) -> r -> s -> r #

Strictly fold right over the elements of a structure with an index.

When you don't need access to the index then foldrOf' is more flexible in what it accepts.

foldrOf' l ≡ ifoldrOf' l . const

ifoldrOf' :: IndexedGetter i s a     -> (i -> a -> r -> r) -> r -> s -> r
ifoldrOf' :: IndexedFold i s a       -> (i -> a -> r -> r) -> r -> s -> r
ifoldrOf' :: IndexedLens' i s a      -> (i -> a -> r -> r) -> r -> s -> r
ifoldrOf' :: IndexedTraversal' i s a -> (i -> a -> r -> r) -> r -> s -> r

ifindMOf :: Monad m => IndexedGetting i (Endo (m (Maybe a))) s a -> (i -> a -> m Bool) -> s -> m (Maybe a) #

The ifindMOf function takes an IndexedFold or IndexedTraversal, a monadic predicate that is also supplied the index, a structure and returns in the monad the left-most element of the structure matching the predicate, or Nothing if there is no such element.

When you don't need access to the index then findMOf is more flexible in what it accepts.

findMOf l ≡ ifindMOf l . const

ifindMOf :: Monad m => IndexedGetter i s a     -> (i -> a -> m Bool) -> s -> m (Maybe a)
ifindMOf :: Monad m => IndexedFold i s a       -> (i -> a -> m Bool) -> s -> m (Maybe a)
ifindMOf :: Monad m => IndexedLens' i s a      -> (i -> a -> m Bool) -> s -> m (Maybe a)
ifindMOf :: Monad m => IndexedTraversal' i s a -> (i -> a -> m Bool) -> s -> m (Maybe a)

ifindOf :: IndexedGetting i (Endo (Maybe a)) s a -> (i -> a -> Bool) -> s -> Maybe a #

The ifindOf function takes an IndexedFold or IndexedTraversal, a predicate that is also supplied the index, a structure and returns the left-most element of the structure matching the predicate, or Nothing if there is no such element.

When you don't need access to the index then findOf is more flexible in what it accepts.

findOf l ≡ ifindOf l . const

ifindOf :: IndexedGetter i s a     -> (i -> a -> Bool) -> s -> Maybe a
ifindOf :: IndexedFold i s a       -> (i -> a -> Bool) -> s -> Maybe a
ifindOf :: IndexedLens' i s a      -> (i -> a -> Bool) -> s -> Maybe a
ifindOf :: IndexedTraversal' i s a -> (i -> a -> Bool) -> s -> Maybe a

iconcatMapOf :: IndexedGetting i [r] s a -> (i -> a -> [r]) -> s -> [r] #

Concatenate the results of a function of the elements of an IndexedFold or IndexedTraversal with access to the index.

When you don't need access to the index then concatMapOf is more flexible in what it accepts.

concatMapOf l ≡ iconcatMapOf l . const
iconcatMapOf ≡ ifoldMapOf

iconcatMapOf :: IndexedGetter i s a     -> (i -> a -> [r]) -> s -> [r]
iconcatMapOf :: IndexedFold i s a       -> (i -> a -> [r]) -> s -> [r]
iconcatMapOf :: IndexedLens' i s a      -> (i -> a -> [r]) -> s -> [r]
iconcatMapOf :: IndexedTraversal' i s a -> (i -> a -> [r]) -> s -> [r]

iforMOf_ :: Monad m => IndexedGetting i (Sequenced r m) s a -> s -> (i -> a -> m r) -> m () #

Run monadic actions for each target of an IndexedFold or IndexedTraversal with access to the index, discarding the results (with the arguments flipped).

iforMOf_ ≡ flip . imapMOf_

When you don't need access to the index then forMOf_ is more flexible in what it accepts.

forMOf_ l a ≡ iforMOf l a . const

iforMOf_ :: Monad m => IndexedGetter i s a     -> s -> (i -> a -> m r) -> m ()
iforMOf_ :: Monad m => IndexedFold i s a       -> s -> (i -> a -> m r) -> m ()
iforMOf_ :: Monad m => IndexedLens' i s a      -> s -> (i -> a -> m r) -> m ()
iforMOf_ :: Monad m => IndexedTraversal' i s a -> s -> (i -> a -> m r) -> m ()

imapMOf_ :: Monad m => IndexedGetting i (Sequenced r m) s a -> (i -> a -> m r) -> s -> m () #

Run monadic actions for each target of an IndexedFold or IndexedTraversal with access to the index, discarding the results.

When you don't need access to the index then mapMOf_ is more flexible in what it accepts.

mapMOf_ l ≡ imapMOf l . const

imapMOf_ :: Monad m => IndexedGetter i s a     -> (i -> a -> m r) -> s -> m ()
imapMOf_ :: Monad m => IndexedFold i s a       -> (i -> a -> m r) -> s -> m ()
imapMOf_ :: Monad m => IndexedLens' i s a      -> (i -> a -> m r) -> s -> m ()
imapMOf_ :: Monad m => IndexedTraversal' i s a -> (i -> a -> m r) -> s -> m ()

iforOf_ :: Functor f => IndexedGetting i (Traversed r f) s a -> s -> (i -> a -> f r) -> f () #

Traverse the targets of an IndexedFold or IndexedTraversal with access to the index, discarding the results (with the arguments flipped).

iforOf_ ≡ flip . itraverseOf_

When you don't need access to the index then forOf_ is more flexible in what it accepts.

forOf_ l a ≡ iforOf_ l a . const

iforOf_ :: Functor f     => IndexedGetter i s a     -> s -> (i -> a -> f r) -> f ()
iforOf_ :: Applicative f => IndexedFold i s a       -> s -> (i -> a -> f r) -> f ()
iforOf_ :: Functor f     => IndexedLens' i s a      -> s -> (i -> a -> f r) -> f ()
iforOf_ :: Applicative f => IndexedTraversal' i s a -> s -> (i -> a -> f r) -> f ()

itraverseOf_ :: Functor f => IndexedGetting i (Traversed r f) s a -> (i -> a -> f r) -> s -> f () #

Traverse the targets of an IndexedFold or IndexedTraversal with access to the i, discarding the results.

When you don't need access to the index then traverseOf_ is more flexible in what it accepts.

traverseOf_ l ≡ itraverseOf l . const

itraverseOf_ :: Functor f     => IndexedGetter i s a     -> (i -> a -> f r) -> s -> f ()
itraverseOf_ :: Applicative f => IndexedFold i s a       -> (i -> a -> f r) -> s -> f ()
itraverseOf_ :: Functor f     => IndexedLens' i s a      -> (i -> a -> f r) -> s -> f ()
itraverseOf_ :: Applicative f => IndexedTraversal' i s a -> (i -> a -> f r) -> s -> f ()

inoneOf :: IndexedGetting i Any s a -> (i -> a -> Bool) -> s -> Bool #

Return whether or not none of the elements viewed through an IndexedFold or IndexedTraversal satisfy a predicate, with access to the i.

When you don't need access to the index then noneOf is more flexible in what it accepts.

noneOf l ≡ inoneOf l . const

inoneOf :: IndexedGetter i s a     -> (i -> a -> Bool) -> s -> Bool
inoneOf :: IndexedFold i s a       -> (i -> a -> Bool) -> s -> Bool
inoneOf :: IndexedLens' i s a      -> (i -> a -> Bool) -> s -> Bool
inoneOf :: IndexedTraversal' i s a -> (i -> a -> Bool) -> s -> Bool

iallOf :: IndexedGetting i All s a -> (i -> a -> Bool) -> s -> Bool #

Return whether or not all elements viewed through an IndexedFold or IndexedTraversal satisfy a predicate, with access to the i.

When you don't need access to the index then allOf is more flexible in what it accepts.

allOf l ≡ iallOf l . const

iallOf :: IndexedGetter i s a     -> (i -> a -> Bool) -> s -> Bool
iallOf :: IndexedFold i s a       -> (i -> a -> Bool) -> s -> Bool
iallOf :: IndexedLens' i s a      -> (i -> a -> Bool) -> s -> Bool
iallOf :: IndexedTraversal' i s a -> (i -> a -> Bool) -> s -> Bool

ianyOf :: IndexedGetting i Any s a -> (i -> a -> Bool) -> s -> Bool #

Return whether or not any element viewed through an IndexedFold or IndexedTraversal satisfy a predicate, with access to the i.

When you don't need access to the index then anyOf is more flexible in what it accepts.

anyOf l ≡ ianyOf l . const

ianyOf :: IndexedGetter i s a     -> (i -> a -> Bool) -> s -> Bool
ianyOf :: IndexedFold i s a       -> (i -> a -> Bool) -> s -> Bool
ianyOf :: IndexedLens' i s a      -> (i -> a -> Bool) -> s -> Bool
ianyOf :: IndexedTraversal' i s a -> (i -> a -> Bool) -> s -> Bool

ifoldlOf :: IndexedGetting i (Dual (Endo r)) s a -> (i -> r -> a -> r) -> r -> s -> r #

Left-associative fold of the parts of a structure that are viewed through an IndexedFold or IndexedTraversal with access to the i.

When you don't need access to the index then foldlOf is more flexible in what it accepts.

foldlOf l ≡ ifoldlOf l . const

ifoldlOf :: IndexedGetter i s a     -> (i -> r -> a -> r) -> r -> s -> r
ifoldlOf :: IndexedFold i s a       -> (i -> r -> a -> r) -> r -> s -> r
ifoldlOf :: IndexedLens' i s a      -> (i -> r -> a -> r) -> r -> s -> r
ifoldlOf :: IndexedTraversal' i s a -> (i -> r -> a -> r) -> r -> s -> r

ifoldrOf :: IndexedGetting i (Endo r) s a -> (i -> a -> r -> r) -> r -> s -> r #

Right-associative fold of parts of a structure that are viewed through an IndexedFold or IndexedTraversal with access to the i.

When you don't need access to the index then foldrOf is more flexible in what it accepts.

foldrOf l ≡ ifoldrOf l . const

ifoldrOf :: IndexedGetter i s a     -> (i -> a -> r -> r) -> r -> s -> r
ifoldrOf :: IndexedFold i s a       -> (i -> a -> r -> r) -> r -> s -> r
ifoldrOf :: IndexedLens' i s a      -> (i -> a -> r -> r) -> r -> s -> r
ifoldrOf :: IndexedTraversal' i s a -> (i -> a -> r -> r) -> r -> s -> r

ifoldMapOf :: IndexedGetting i m s a -> (i -> a -> m) -> s -> m #

Fold an IndexedFold or IndexedTraversal by mapping indices and values to an arbitrary Monoid with access to the i.

When you don't need access to the index then foldMapOf is more flexible in what it accepts.

foldMapOf l ≡ ifoldMapOf l . const

ifoldMapOf ::             IndexedGetter i s a     -> (i -> a -> m) -> s -> m
ifoldMapOf :: Monoid m => IndexedFold i s a       -> (i -> a -> m) -> s -> m
ifoldMapOf ::             IndexedLens' i s a      -> (i -> a -> m) -> s -> m
ifoldMapOf :: Monoid m => IndexedTraversal' i s a -> (i -> a -> m) -> s -> m

ipreuses :: MonadState s m => IndexedGetting i (First r) s a -> (i -> a -> r) -> m (Maybe r) #

Retrieve a function of the first index and value targeted by an IndexedFold or IndexedTraversal (or a function of Just the index and result from an IndexedGetter or IndexedLens) into the current state.

ipreuses = uses . ipre

ipreuses :: MonadState s m => IndexedGetter i s a     -> (i -> a -> r) -> m (Maybe r)
ipreuses :: MonadState s m => IndexedFold i s a       -> (i -> a -> r) -> m (Maybe r)
ipreuses :: MonadState s m => IndexedLens' i s a      -> (i -> a -> r) -> m (Maybe r)
ipreuses :: MonadState s m => IndexedTraversal' i s a -> (i -> a -> r) -> m (Maybe r)

preuses :: MonadState s m => Getting (First r) s a -> (a -> r) -> m (Maybe r) #

Retrieve a function of the first value targeted by a Fold or Traversal (or Just the result from a Getter or Lens) into the current state.

preuses = uses . pre

preuses :: MonadState s m => Getter s a     -> (a -> r) -> m (Maybe r)
preuses :: MonadState s m => Fold s a       -> (a -> r) -> m (Maybe r)
preuses :: MonadState s m => Lens' s a      -> (a -> r) -> m (Maybe r)
preuses :: MonadState s m => Iso' s a       -> (a -> r) -> m (Maybe r)
preuses :: MonadState s m => Traversal' s a -> (a -> r) -> m (Maybe r)

ipreuse :: MonadState s m => IndexedGetting i (First (i, a)) s a -> m (Maybe (i, a)) #

Retrieve the first index and value targeted by an IndexedFold or IndexedTraversal (or Just the index and result from an IndexedGetter or IndexedLens) into the current state.

ipreuse = use . ipre

ipreuse :: MonadState s m => IndexedGetter i s a     -> m (Maybe (i, a))
ipreuse :: MonadState s m => IndexedFold i s a       -> m (Maybe (i, a))
ipreuse :: MonadState s m => IndexedLens' i s a      -> m (Maybe (i, a))
ipreuse :: MonadState s m => IndexedTraversal' i s a -> m (Maybe (i, a))

preuse :: MonadState s m => Getting (First a) s a -> m (Maybe a) #

Retrieve the first value targeted by a Fold or Traversal (or Just the result from a Getter or Lens) into the current state.

preuse = use . pre

preuse :: MonadState s m => Getter s a     -> m (Maybe a)
preuse :: MonadState s m => Fold s a       -> m (Maybe a)
preuse :: MonadState s m => Lens' s a      -> m (Maybe a)
preuse :: MonadState s m => Iso' s a       -> m (Maybe a)
preuse :: MonadState s m => Traversal' s a -> m (Maybe a)

ipreviews :: MonadReader s m => IndexedGetting i (First r) s a -> (i -> a -> r) -> m (Maybe r) #

Retrieve a function of the first index and value targeted by an IndexedFold or IndexedTraversal (or Just the result from an IndexedGetter or IndexedLens). See also (^@?).

ipreviews = views . ipre

This is usually applied in the Reader Monad (->) s.

ipreviews :: IndexedGetter i s a     -> (i -> a -> r) -> s -> Maybe r
ipreviews :: IndexedFold i s a       -> (i -> a -> r) -> s -> Maybe r
ipreviews :: IndexedLens' i s a      -> (i -> a -> r) -> s -> Maybe r
ipreviews :: IndexedTraversal' i s a -> (i -> a -> r) -> s -> Maybe r

However, it may be useful to think of its full generality when working with a Monad transformer stack:

ipreviews :: MonadReader s m => IndexedGetter i s a     -> (i -> a -> r) -> m (Maybe r)
ipreviews :: MonadReader s m => IndexedFold i s a       -> (i -> a -> r) -> m (Maybe r)
ipreviews :: MonadReader s m => IndexedLens' i s a      -> (i -> a -> r) -> m (Maybe r)
ipreviews :: MonadReader s m => IndexedTraversal' i s a -> (i -> a -> r) -> m (Maybe r)

previews :: MonadReader s m => Getting (First r) s a -> (a -> r) -> m (Maybe r) #

Retrieve a function of the first value targeted by a Fold or Traversal (or Just the result from a Getter or Lens).

This is usually applied in the Reader Monad (->) s.

ipreview :: MonadReader s m => IndexedGetting i (First (i, a)) s a -> m (Maybe (i, a)) #

Retrieve the first index and value targeted by a Fold or Traversal (or Just the result from a Getter or Lens). See also (^@?).

ipreview = view . ipre

This is usually applied in the Reader Monad (->) s.

ipreview :: IndexedGetter i s a     -> s -> Maybe (i, a)
ipreview :: IndexedFold i s a       -> s -> Maybe (i, a)
ipreview :: IndexedLens' i s a      -> s -> Maybe (i, a)
ipreview :: IndexedTraversal' i s a -> s -> Maybe (i, a)

However, it may be useful to think of its full generality when working with a Monad transformer stack:

ipreview :: MonadReader s m => IndexedGetter s a     -> m (Maybe (i, a))
ipreview :: MonadReader s m => IndexedFold s a       -> m (Maybe (i, a))
ipreview :: MonadReader s m => IndexedLens' s a      -> m (Maybe (i, a))
ipreview :: MonadReader s m => IndexedTraversal' s a -> m (Maybe (i, a))

preview :: MonadReader s m => Getting (First a) s a -> m (Maybe a) #

Retrieve the first value targeted by a Fold or Traversal (or Just the result from a Getter or Lens). See also firstOf and ^?, which are similar with some subtle differences (explained below).

listToMaybe . toList ≡ preview folded

preview = view . pre

Unlike ^?, this function uses a MonadReader to read the value to be focused in on. This allows one to pass the value as the last argument by using the MonadReader instance for (->) s However, it may also be used as part of some deeply nested transformer stack.

preview uses a monoidal value to obtain the result. This means that it generally has good performance, but can occasionally cause space leaks or even stack overflows on some data types. There is another function, firstOf, which avoids these issues at the cost of a slight constant performance cost and a little less flexibility.

It may be helpful to think of preview as having one of the following more specialized types:

preview :: Getter s a     -> s -> Maybe a
preview :: Fold s a       -> s -> Maybe a
preview :: Lens' s a      -> s -> Maybe a
preview :: Iso' s a       -> s -> Maybe a
preview :: Traversal' s a -> s -> Maybe a

preview :: MonadReader s m => Getter s a     -> m (Maybe a)
preview :: MonadReader s m => Fold s a       -> m (Maybe a)
preview :: MonadReader s m => Lens' s a      -> m (Maybe a)
preview :: MonadReader s m => Iso' s a       -> m (Maybe a)
preview :: MonadReader s m => Traversal' s a -> m (Maybe a)

ipre :: IndexedGetting i (First (i, a)) s a -> IndexPreservingGetter s (Maybe (i, a)) #

This converts an IndexedFold to an IndexPreservingGetter that returns the first index and element, if they exist, as a Maybe.

ipre :: IndexedGetter i s a     -> IndexPreservingGetter s (Maybe (i, a))
ipre :: IndexedFold i s a       -> IndexPreservingGetter s (Maybe (i, a))
ipre :: IndexedTraversal' i s a -> IndexPreservingGetter s (Maybe (i, a))
ipre :: IndexedLens' i s a      -> IndexPreservingGetter s (Maybe (i, a))

pre :: Getting (First a) s a -> IndexPreservingGetter s (Maybe a) #

This converts a Fold to a IndexPreservingGetter that returns the first element, if it exists, as a Maybe.

pre :: Getter s a     -> IndexPreservingGetter s (Maybe a)
pre :: Fold s a       -> IndexPreservingGetter s (Maybe a)
pre :: Traversal' s a -> IndexPreservingGetter s (Maybe a)
pre :: Lens' s a      -> IndexPreservingGetter s (Maybe a)
pre :: Iso' s a       -> IndexPreservingGetter s (Maybe a)
pre :: Prism' s a     -> IndexPreservingGetter s (Maybe a)

hasn't :: Getting All s a -> s -> Bool #

Check to see if this Fold or Traversal has no matches.

>>> hasn't _Left (Right 12)
True

>>> hasn't _Left (Left 12)
False

has :: Getting Any s a -> s -> Bool #

Check to see if this Fold or Traversal matches 1 or more entries.

>>> has (element 0) []
False

>>> has _Left (Left 12)
True

>>> has _Right (Left 12)
False

This will always return True for a Lens or Getter.

>>> has _1 ("hello","world")
True

has :: Getter s a     -> s -> Bool
has :: Fold s a       -> s -> Bool
has :: Iso' s a       -> s -> Bool
has :: Lens' s a      -> s -> Bool
has :: Traversal' s a -> s -> Bool

foldlMOf :: Monad m => Getting (Endo (r -> m r)) s a -> (r -> a -> m r) -> r -> s -> m r #

Monadic fold over the elements of a structure, associating to the left, i.e. from left to right.

foldlM ≡ foldlMOf folded

foldlMOf :: Monad m => Getter s a     -> (r -> a -> m r) -> r -> s -> m r
foldlMOf :: Monad m => Fold s a       -> (r -> a -> m r) -> r -> s -> m r
foldlMOf :: Monad m => Iso' s a       -> (r -> a -> m r) -> r -> s -> m r
foldlMOf :: Monad m => Lens' s a      -> (r -> a -> m r) -> r -> s -> m r
foldlMOf :: Monad m => Traversal' s a -> (r -> a -> m r) -> r -> s -> m r

foldrMOf :: Monad m => Getting (Dual (Endo (r -> m r))) s a -> (a -> r -> m r) -> r -> s -> m r #

Monadic fold over the elements of a structure, associating to the right, i.e. from right to left.

foldrM ≡ foldrMOf folded

foldrMOf :: Monad m => Getter s a     -> (a -> r -> m r) -> r -> s -> m r
foldrMOf :: Monad m => Fold s a       -> (a -> r -> m r) -> r -> s -> m r
foldrMOf :: Monad m => Iso' s a       -> (a -> r -> m r) -> r -> s -> m r
foldrMOf :: Monad m => Lens' s a      -> (a -> r -> m r) -> r -> s -> m r
foldrMOf :: Monad m => Traversal' s a -> (a -> r -> m r) -> r -> s -> m r

foldl1Of' :: HasCallStack => Getting (Endo (Endo (Maybe a))) s a -> (a -> a -> a) -> s -> a #

A variant of foldlOf' that has no base case and thus may only be applied to folds and structures such that the fold views at least one element of the structure.

foldl1Of' l f ≡ foldl1' f . toListOf l

foldl1Of' :: Getter s a     -> (a -> a -> a) -> s -> a
foldl1Of' :: Fold s a       -> (a -> a -> a) -> s -> a
foldl1Of' :: Iso' s a       -> (a -> a -> a) -> s -> a
foldl1Of' :: Lens' s a      -> (a -> a -> a) -> s -> a
foldl1Of' :: Traversal' s a -> (a -> a -> a) -> s -> a

foldr1Of' :: HasCallStack => Getting (Dual (Endo (Endo (Maybe a)))) s a -> (a -> a -> a) -> s -> a #

A variant of foldrOf' that has no base case and thus may only be applied to folds and structures such that the fold views at least one element of the structure.

foldr1Of l f ≡ foldr1 f . toListOf l

foldr1Of' :: Getter s a     -> (a -> a -> a) -> s -> a
foldr1Of' :: Fold s a       -> (a -> a -> a) -> s -> a
foldr1Of' :: Iso' s a       -> (a -> a -> a) -> s -> a
foldr1Of' :: Lens' s a      -> (a -> a -> a) -> s -> a
foldr1Of' :: Traversal' s a -> (a -> a -> a) -> s -> a

foldlOf' :: Getting (Endo (Endo r)) s a -> (r -> a -> r) -> r -> s -> r #

Fold over the elements of a structure, associating to the left, but strictly.

foldl' ≡ foldlOf' folded

foldlOf' :: Getter s a     -> (r -> a -> r) -> r -> s -> r
foldlOf' :: Fold s a       -> (r -> a -> r) -> r -> s -> r
foldlOf' :: Iso' s a       -> (r -> a -> r) -> r -> s -> r
foldlOf' :: Lens' s a      -> (r -> a -> r) -> r -> s -> r
foldlOf' :: Traversal' s a -> (r -> a -> r) -> r -> s -> r

foldrOf' :: Getting (Dual (Endo (Endo r))) s a -> (a -> r -> r) -> r -> s -> r #

Strictly fold right over the elements of a structure.

foldr' ≡ foldrOf' folded

foldrOf' :: Getter s a     -> (a -> r -> r) -> r -> s -> r
foldrOf' :: Fold s a       -> (a -> r -> r) -> r -> s -> r
foldrOf' :: Iso' s a       -> (a -> r -> r) -> r -> s -> r
foldrOf' :: Lens' s a      -> (a -> r -> r) -> r -> s -> r
foldrOf' :: Traversal' s a -> (a -> r -> r) -> r -> s -> r

foldl1Of :: HasCallStack => Getting (Dual (Endo (Maybe a))) s a -> (a -> a -> a) -> s -> a #

A variant of foldlOf that has no base case and thus may only be applied to lenses and structures such that the Lens views at least one element of the structure.

>>> foldl1Of each (+) (1,2,3,4)
10

foldl1Of l f ≡ foldl1 f . toListOf l
foldl1 ≡ foldl1Of folded

foldl1Of :: Getter s a     -> (a -> a -> a) -> s -> a
foldl1Of :: Fold s a       -> (a -> a -> a) -> s -> a
foldl1Of :: Iso' s a       -> (a -> a -> a) -> s -> a
foldl1Of :: Lens' s a      -> (a -> a -> a) -> s -> a
foldl1Of :: Traversal' s a -> (a -> a -> a) -> s -> a

foldr1Of :: HasCallStack => Getting (Endo (Maybe a)) s a -> (a -> a -> a) -> s -> a #

A variant of foldrOf that has no base case and thus may only be applied to lenses and structures such that the Lens views at least one element of the structure.

>>> foldr1Of each (+) (1,2,3,4)
10

foldr1Of l f ≡ foldr1 f . toListOf l
foldr1 ≡ foldr1Of folded

foldr1Of :: Getter s a     -> (a -> a -> a) -> s -> a
foldr1Of :: Fold s a       -> (a -> a -> a) -> s -> a
foldr1Of :: Iso' s a       -> (a -> a -> a) -> s -> a
foldr1Of :: Lens' s a      -> (a -> a -> a) -> s -> a
foldr1Of :: Traversal' s a -> (a -> a -> a) -> s -> a

lookupOf :: Eq k => Getting (Endo (Maybe v)) s (k, v) -> k -> s -> Maybe v #

The lookupOf function takes a Fold (or Getter, Traversal, Lens, Iso, etc.), a key, and a structure containing key/value pairs. It returns the first value corresponding to the given key. This function generalizes lookup to work on an arbitrary Fold instead of lists.

>>> lookupOf folded 4 [(2, 'a'), (4, 'b'), (4, 'c')]
Just 'b'

>>> lookupOf each 2 [(2, 'a'), (4, 'b'), (4, 'c')]
Just 'a'

lookupOf :: Eq k => Fold s (k,v) -> k -> s -> Maybe v

findMOf :: Monad m => Getting (Endo (m (Maybe a))) s a -> (a -> m Bool) -> s -> m (Maybe a) #

The findMOf function takes a Lens (or Getter, Iso, Fold, or Traversal), a monadic predicate and a structure and returns in the monad the leftmost element of the structure matching the predicate, or Nothing if there is no such element.

>>> findMOf each ( \x -> print ("Checking " ++ show x) >> return (even x)) (1,3,4,6)
"Checking 1"
"Checking 3"
"Checking 4"
Just 4

>>> findMOf each ( \x -> print ("Checking " ++ show x) >> return (even x)) (1,3,5,7)
"Checking 1"
"Checking 3"
"Checking 5"
"Checking 7"
Nothing

findMOf :: (Monad m, Getter s a)     -> (a -> m Bool) -> s -> m (Maybe a)
findMOf :: (Monad m, Fold s a)       -> (a -> m Bool) -> s -> m (Maybe a)
findMOf :: (Monad m, Iso' s a)       -> (a -> m Bool) -> s -> m (Maybe a)
findMOf :: (Monad m, Lens' s a)      -> (a -> m Bool) -> s -> m (Maybe a)
findMOf :: (Monad m, Traversal' s a) -> (a -> m Bool) -> s -> m (Maybe a)

findMOf folded :: (Monad m, Foldable f) => (a -> m Bool) -> f a -> m (Maybe a)
ifindMOf l ≡ findMOf l . Indexed

A simpler version that didn't permit indexing, would be:

findMOf :: Monad m => Getting (Endo (m (Maybe a))) s a -> (a -> m Bool) -> s -> m (Maybe a)
findMOf l p = foldrOf l (a y -> p a >>= x -> if x then return (Just a) else y) $ return Nothing

findOf :: Getting (Endo (Maybe a)) s a -> (a -> Bool) -> s -> Maybe a #

The findOf function takes a Lens (or Getter, Iso, Fold, or Traversal), a predicate and a structure and returns the leftmost element of the structure matching the predicate, or Nothing if there is no such element.

>>> findOf each even (1,3,4,6)
Just 4

>>> findOf folded even [1,3,5,7]
Nothing

findOf :: Getter s a     -> (a -> Bool) -> s -> Maybe a
findOf :: Fold s a       -> (a -> Bool) -> s -> Maybe a
findOf :: Iso' s a       -> (a -> Bool) -> s -> Maybe a
findOf :: Lens' s a      -> (a -> Bool) -> s -> Maybe a
findOf :: Traversal' s a -> (a -> Bool) -> s -> Maybe a

find ≡ findOf folded
ifindOf l ≡ findOf l . Indexed

A simpler version that didn't permit indexing, would be:

findOf :: Getting (Endo (Maybe a)) s a -> (a -> Bool) -> s -> Maybe a
findOf l p = foldrOf l (a y -> if p a then Just a else y) Nothing

minimumByOf :: Getting (Endo (Endo (Maybe a))) s a -> (a -> a -> Ordering) -> s -> Maybe a #

Obtain the minimum element (if any) targeted by a Fold, Traversal, Lens, Iso or Getter according to a user supplied Ordering.

In the interest of efficiency, This operation has semantics more strict than strictly necessary.

>>> minimumByOf traverse (compare `on` length) ["mustard","relish","ham"]
Just "ham"

minimumBy cmp ≡ fromMaybe (error "empty") . minimumByOf folded cmp

minimumByOf :: Getter s a     -> (a -> a -> Ordering) -> s -> Maybe a
minimumByOf :: Fold s a       -> (a -> a -> Ordering) -> s -> Maybe a
minimumByOf :: Iso' s a       -> (a -> a -> Ordering) -> s -> Maybe a
minimumByOf :: Lens' s a      -> (a -> a -> Ordering) -> s -> Maybe a
minimumByOf :: Traversal' s a -> (a -> a -> Ordering) -> s -> Maybe a

maximumByOf :: Getting (Endo (Endo (Maybe a))) s a -> (a -> a -> Ordering) -> s -> Maybe a #

Obtain the maximum element (if any) targeted by a Fold, Traversal, Lens, Iso, or Getter according to a user supplied Ordering.

>>> maximumByOf traverse (compare `on` length) ["mustard","relish","ham"]
Just "mustard"

In the interest of efficiency, This operation has semantics more strict than strictly necessary.

maximumBy cmp ≡ fromMaybe (error "empty") . maximumByOf folded cmp

maximumByOf :: Getter s a     -> (a -> a -> Ordering) -> s -> Maybe a
maximumByOf :: Fold s a       -> (a -> a -> Ordering) -> s -> Maybe a
maximumByOf :: Iso' s a       -> (a -> a -> Ordering) -> s -> Maybe a
maximumByOf :: Lens' s a      -> (a -> a -> Ordering) -> s -> Maybe a
maximumByOf :: Traversal' s a -> (a -> a -> Ordering) -> s -> Maybe a

minimum1Of :: Ord a => Getting (Min a) s a -> s -> a #

Obtain the minimum element targeted by a Fold1 or Traversal1.

>>> minimum1Of traverse1 (1 :| [2..10])
1

minimum1Of :: Ord a => Getter s a      -> s -> a
minimum1Of :: Ord a => Fold1 s a       -> s -> a
minimum1Of :: Ord a => Iso' s a        -> s -> a
minimum1Of :: Ord a => Lens' s a       -> s -> a
minimum1Of :: Ord a => Traversal1' s a -> s -> a

minimumOf :: Ord a => Getting (Endo (Endo (Maybe a))) s a -> s -> Maybe a #

Obtain the minimum element (if any) targeted by a Fold or Traversal safely.

Note: minimumOf on a valid Iso, Lens or Getter will always return Just a value.

>>> minimumOf traverse [1..10]
Just 1

>>> minimumOf traverse []
Nothing

>>> minimumOf (folded.filtered even) [1,4,3,6,7,9,2]
Just 2

minimum ≡ fromMaybe (error "empty") . minimumOf folded

In the interest of efficiency, This operation has semantics more strict than strictly necessary. rmap getMin (foldMapOf l Min) has lazier semantics but could leak memory.

minimumOf :: Ord a => Getter s a     -> s -> Maybe a
minimumOf :: Ord a => Fold s a       -> s -> Maybe a
minimumOf :: Ord a => Iso' s a       -> s -> Maybe a
minimumOf :: Ord a => Lens' s a      -> s -> Maybe a
minimumOf :: Ord a => Traversal' s a -> s -> Maybe a

maximum1Of :: Ord a => Getting (Max a) s a -> s -> a #

Obtain the maximum element targeted by a Fold1 or Traversal1.

>>> maximum1Of traverse1 (1 :| [2..10])
10

maximum1Of :: Ord a => Getter s a      -> s -> a
maximum1Of :: Ord a => Fold1 s a       -> s -> a
maximum1Of :: Ord a => Iso' s a        -> s -> a
maximum1Of :: Ord a => Lens' s a       -> s -> a
maximum1Of :: Ord a => Traversal1' s a -> s -> a

maximumOf :: Ord a => Getting (Endo (Endo (Maybe a))) s a -> s -> Maybe a #

Obtain the maximum element (if any) targeted by a Fold or Traversal safely.

Note: maximumOf on a valid Iso, Lens or Getter will always return Just a value.

>>> maximumOf traverse [1..10]
Just 10

>>> maximumOf traverse []
Nothing

>>> maximumOf (folded.filtered even) [1,4,3,6,7,9,2]
Just 6

maximum ≡ fromMaybe (error "empty") . maximumOf folded

In the interest of efficiency, This operation has semantics more strict than strictly necessary. rmap getMax (foldMapOf l Max) has lazier semantics but could leak memory.

maximumOf :: Ord a => Getter s a     -> s -> Maybe a
maximumOf :: Ord a => Fold s a       -> s -> Maybe a
maximumOf :: Ord a => Iso' s a       -> s -> Maybe a
maximumOf :: Ord a => Lens' s a      -> s -> Maybe a
maximumOf :: Ord a => Traversal' s a -> s -> Maybe a

notNullOf :: Getting Any s a -> s -> Bool #

Returns True if this Fold or Traversal has any targets in the given container.

A more "conversational" alias for this combinator is has.

Note: notNullOf on a valid Iso, Lens or Getter should always return True.

not . null ≡ notNullOf folded

This may be rather inefficient compared to the not . null check of many containers.

>>> notNullOf _1 (1,2)
True

>>> notNullOf traverse [1..10]
True

>>> notNullOf folded []
False

>>> notNullOf (element 20) [1..10]
False

notNullOf (folded . _1 . folded) :: (Foldable f, Foldable g) => f (g a, b) -> Bool

notNullOf :: Getter s a     -> s -> Bool
notNullOf :: Fold s a       -> s -> Bool
notNullOf :: Iso' s a       -> s -> Bool
notNullOf :: Lens' s a      -> s -> Bool
notNullOf :: Traversal' s a -> s -> Bool

nullOf :: Getting All s a -> s -> Bool #

Returns True if this Fold or Traversal has no targets in the given container.

Note: nullOf on a valid Iso, Lens or Getter should always return False.

null ≡ nullOf folded

This may be rather inefficient compared to the null check of many containers.

>>> nullOf _1 (1,2)
False

>>> nullOf ignored ()
True

>>> nullOf traverse []
True

>>> nullOf (element 20) [1..10]
True

nullOf (folded . _1 . folded) :: (Foldable f, Foldable g) => f (g a, b) -> Bool

nullOf :: Getter s a     -> s -> Bool
nullOf :: Fold s a       -> s -> Bool
nullOf :: Iso' s a       -> s -> Bool
nullOf :: Lens' s a      -> s -> Bool
nullOf :: Traversal' s a -> s -> Bool

last1Of :: Getting (Last a) s a -> s -> a #

Retrieve the Last entry of a Fold1 or Traversal1 or retrieve the result from a Getter or Lens.o

>>> last1Of traverse1 (1 :| [2..10])
10

>>> last1Of both1 (1,2)
2

last1Of :: Getter s a      -> s -> Maybe a
last1Of :: Fold1 s a       -> s -> Maybe a
last1Of :: Lens' s a       -> s -> Maybe a
last1Of :: Iso' s a        -> s -> Maybe a
last1Of :: Traversal1' s a -> s -> Maybe a

lastOf :: Getting (Rightmost a) s a -> s -> Maybe a #

Retrieve the Last entry of a Fold or Traversal or retrieve Just the result from a Getter or Lens.

The answer is computed in a manner that leaks space less than ala Last . foldMapOf and gives you back access to the outermost Just constructor more quickly, but may have worse constant factors.

>>> lastOf traverse [1..10]
Just 10

>>> lastOf both (1,2)
Just 2

>>> lastOf ignored ()
Nothing

lastOf :: Getter s a     -> s -> Maybe a
lastOf :: Fold s a       -> s -> Maybe a
lastOf :: Lens' s a      -> s -> Maybe a
lastOf :: Iso' s a       -> s -> Maybe a
lastOf :: Traversal' s a -> s -> Maybe a

first1Of :: Getting (First a) s a -> s -> a #

Retrieve the First entry of a Fold1 or Traversal1 or the result from a Getter or Lens.

>>> first1Of traverse1 (1 :| [2..10])
1

>>> first1Of both1 (1,2)
1

Note: this is different from ^..

>>> first1Of traverse1 ([1,2] :| [[3,4],[5,6]])
[1,2]

>>> ([1,2] :| [[3,4],[5,6]]) ^. traverse1
[1,2,3,4,5,6]

first1Of :: Getter s a      -> s -> a
first1Of :: Fold1 s a       -> s -> a
first1Of :: Lens' s a       -> s -> a
first1Of :: Iso' s a        -> s -> a
first1Of :: Traversal1' s a -> s -> a

firstOf :: Getting (Leftmost a) s a -> s -> Maybe a #

Retrieve the First entry of a Fold or Traversal or retrieve Just the result from a Getter or Lens.

The answer is computed in a manner that leaks space less than preview or ^?' and gives you back access to the outermost Just constructor more quickly, but does so in a way that builds an intermediate structure, and thus may have worse constant factors. This also means that it can not be used in any MonadReader, but must instead have s passed as its last argument, unlike preview.

Note: this could been named headOf.

>>> firstOf traverse [1..10]
Just 1

>>> firstOf both (1,2)
Just 1

>>> firstOf ignored ()
Nothing

firstOf :: Getter s a     -> s -> Maybe a
firstOf :: Fold s a       -> s -> Maybe a
firstOf :: Lens' s a      -> s -> Maybe a
firstOf :: Iso' s a       -> s -> Maybe a
firstOf :: Traversal' s a -> s -> Maybe a

(^?!) :: HasCallStack => s -> Getting (Endo a) s a -> a infixl 8 #

Perform an *UNSAFE* head of a Fold or Traversal assuming that it is there.

>>> Left 4 ^?! _Left
4

>>> "world" ^?! ix 3
'l'

(^?!) :: s -> Getter s a     -> a
(^?!) :: s -> Fold s a       -> a
(^?!) :: s -> Lens' s a      -> a
(^?!) :: s -> Iso' s a       -> a
(^?!) :: s -> Traversal' s a -> a

(^?) :: s -> Getting (First a) s a -> Maybe a infixl 8 #

Perform a safe head of a Fold or Traversal or retrieve Just the result from a Getter or Lens.

When using a Traversal as a partial Lens, or a Fold as a partial Getter this can be a convenient way to extract the optional value.

Note: if you get stack overflows due to this, you may want to use firstOf instead, which can deal more gracefully with heavily left-biased trees. This is because ^? works by using the First monoid, which can occasionally cause space leaks.

>>> Left 4 ^?_Left
Just 4

>>> Right 4 ^?_Left
Nothing

>>> "world" ^? ix 3
Just 'l'

>>> "world" ^? ix 20
Nothing

This operator works as an infix version of preview.

(^?) ≡ flip preview

It may be helpful to think of ^? as having one of the following more specialized types:

(^?) :: s -> Getter s a     -> Maybe a
(^?) :: s -> Fold s a       -> Maybe a
(^?) :: s -> Lens' s a      -> Maybe a
(^?) :: s -> Iso' s a       -> Maybe a
(^?) :: s -> Traversal' s a -> Maybe a

lengthOf :: Getting (Endo (Endo Int)) s a -> s -> Int #

Calculate the number of targets there are for a Fold in a given container.

Note: This can be rather inefficient for large containers and just like length, this will not terminate for infinite folds.

length ≡ lengthOf folded

>>> lengthOf _1 ("hello",())
1

>>> lengthOf traverse [1..10]
10

>>> lengthOf (traverse.traverse) [[1,2],[3,4],[5,6]]
6

lengthOf (folded . folded) :: (Foldable f, Foldable g) => f (g a) -> Int

lengthOf :: Getter s a     -> s -> Int
lengthOf :: Fold s a       -> s -> Int
lengthOf :: Lens' s a      -> s -> Int
lengthOf :: Iso' s a       -> s -> Int
lengthOf :: Traversal' s a -> s -> Int

concatOf :: Getting [r] s [r] -> s -> [r] #

Concatenate all of the lists targeted by a Fold into a longer list.

>>> concatOf both ("pan","ama")
"panama"

concat ≡ concatOf folded
concatOf ≡ view

concatOf :: Getter s [r]     -> s -> [r]
concatOf :: Fold s [r]       -> s -> [r]
concatOf :: Iso' s [r]       -> s -> [r]
concatOf :: Lens' s [r]      -> s -> [r]
concatOf :: Traversal' s [r] -> s -> [r]

concatMapOf :: Getting [r] s a -> (a -> [r]) -> s -> [r] #

Map a function over all the targets of a Fold of a container and concatenate the resulting lists.

>>> concatMapOf both (\x -> [x, x + 1]) (1,3)
[1,2,3,4]

concatMap ≡ concatMapOf folded

concatMapOf :: Getter s a     -> (a -> [r]) -> s -> [r]
concatMapOf :: Fold s a       -> (a -> [r]) -> s -> [r]
concatMapOf :: Lens' s a      -> (a -> [r]) -> s -> [r]
concatMapOf :: Iso' s a       -> (a -> [r]) -> s -> [r]
concatMapOf :: Traversal' s a -> (a -> [r]) -> s -> [r]

notElemOf :: Eq a => Getting All s a -> a -> s -> Bool #

Does the element not occur anywhere within a given Fold of the structure?

>>> notElemOf each 'd' ('a','b','c')
True

>>> notElemOf each 'a' ('a','b','c')
False

notElem ≡ notElemOf folded

notElemOf :: Eq a => Getter s a     -> a -> s -> Bool
notElemOf :: Eq a => Fold s a       -> a -> s -> Bool
notElemOf :: Eq a => Iso' s a       -> a -> s -> Bool
notElemOf :: Eq a => Lens' s a      -> a -> s -> Bool
notElemOf :: Eq a => Traversal' s a -> a -> s -> Bool
notElemOf :: Eq a => Prism' s a     -> a -> s -> Bool

elemOf :: Eq a => Getting Any s a -> a -> s -> Bool #

Does the element occur anywhere within a given Fold of the structure?

>>> elemOf both "hello" ("hello","world")
True

elem ≡ elemOf folded

elemOf :: Eq a => Getter s a     -> a -> s -> Bool
elemOf :: Eq a => Fold s a       -> a -> s -> Bool
elemOf :: Eq a => Lens' s a      -> a -> s -> Bool
elemOf :: Eq a => Iso' s a       -> a -> s -> Bool
elemOf :: Eq a => Traversal' s a -> a -> s -> Bool
elemOf :: Eq a => Prism' s a     -> a -> s -> Bool

msumOf :: MonadPlus m => Getting (Endo (m a)) s (m a) -> s -> m a #

The sum of a collection of actions, generalizing concatOf.

>>> msumOf both ("hello","world")
"helloworld"

>>> msumOf each (Nothing, Just "hello", Nothing)
Just "hello"

msum ≡ msumOf folded

msumOf :: MonadPlus m => Getter s (m a)     -> s -> m a
msumOf :: MonadPlus m => Fold s (m a)       -> s -> m a
msumOf :: MonadPlus m => Lens' s (m a)      -> s -> m a
msumOf :: MonadPlus m => Iso' s (m a)       -> s -> m a
msumOf :: MonadPlus m => Traversal' s (m a) -> s -> m a
msumOf :: MonadPlus m => Prism' s (m a)     -> s -> m a

asumOf :: Alternative f => Getting (Endo (f a)) s (f a) -> s -> f a #

The sum of a collection of actions, generalizing concatOf.

>>> asumOf both ("hello","world")
"helloworld"

>>> asumOf each (Nothing, Just "hello", Nothing)
Just "hello"

asum ≡ asumOf folded

asumOf :: Alternative f => Getter s (f a)     -> s -> f a
asumOf :: Alternative f => Fold s (f a)       -> s -> f a
asumOf :: Alternative f => Lens' s (f a)      -> s -> f a
asumOf :: Alternative f => Iso' s (f a)       -> s -> f a
asumOf :: Alternative f => Traversal' s (f a) -> s -> f a
asumOf :: Alternative f => Prism' s (f a)     -> s -> f a

sequenceOf_ :: Monad m => Getting (Sequenced a m) s (m a) -> s -> m () #

Evaluate each monadic action referenced by a Fold on the structure from left to right, and ignore the results.

>>> sequenceOf_ both (putStrLn "hello",putStrLn "world")
hello
world

sequence_ ≡ sequenceOf_ folded

sequenceOf_ :: Monad m => Getter s (m a)     -> s -> m ()
sequenceOf_ :: Monad m => Fold s (m a)       -> s -> m ()
sequenceOf_ :: Monad m => Lens' s (m a)      -> s -> m ()
sequenceOf_ :: Monad m => Iso' s (m a)       -> s -> m ()
sequenceOf_ :: Monad m => Traversal' s (m a) -> s -> m ()
sequenceOf_ :: Monad m => Prism' s (m a)     -> s -> m ()

forMOf_ :: Monad m => Getting (Sequenced r m) s a -> s -> (a -> m r) -> m () #

forMOf_ is mapMOf_ with two of its arguments flipped.

>>> forMOf_ both ("hello","world") putStrLn
hello
world

forM_ ≡ forMOf_ folded

forMOf_ :: Monad m => Getter s a     -> s -> (a -> m r) -> m ()
forMOf_ :: Monad m => Fold s a       -> s -> (a -> m r) -> m ()
forMOf_ :: Monad m => Lens' s a      -> s -> (a -> m r) -> m ()
forMOf_ :: Monad m => Iso' s a       -> s -> (a -> m r) -> m ()
forMOf_ :: Monad m => Traversal' s a -> s -> (a -> m r) -> m ()
forMOf_ :: Monad m => Prism' s a     -> s -> (a -> m r) -> m ()

mapMOf_ :: Monad m => Getting (Sequenced r m) s a -> (a -> m r) -> s -> m () #

Map each target of a Fold on a structure to a monadic action, evaluate these actions from left to right, and ignore the results.

>>> mapMOf_ both putStrLn ("hello","world")
hello
world

mapM_ ≡ mapMOf_ folded

mapMOf_ :: Monad m => Getter s a     -> (a -> m r) -> s -> m ()
mapMOf_ :: Monad m => Fold s a       -> (a -> m r) -> s -> m ()
mapMOf_ :: Monad m => Lens' s a      -> (a -> m r) -> s -> m ()
mapMOf_ :: Monad m => Iso' s a       -> (a -> m r) -> s -> m ()
mapMOf_ :: Monad m => Traversal' s a -> (a -> m r) -> s -> m ()
mapMOf_ :: Monad m => Prism' s a     -> (a -> m r) -> s -> m ()

sequence1Of_ :: Functor f => Getting (TraversedF a f) s (f a) -> s -> f () #

See sequenceAOf_ and traverse1Of_.

sequence1Of_ :: Apply f => Fold1 s (f a) -> s -> f ()

Since: lens-4.16

for1Of_ :: Functor f => Getting (TraversedF r f) s a -> s -> (a -> f r) -> f () #

See forOf_ and traverse1Of_.

>>> for1Of_ both1 ("abc", "bcd") (\ks -> Map.fromList [ (k, ()) | k <- ks ])
fromList [('b',()),('c',())]

for1Of_ :: Apply f => Fold1 s a -> s -> (a -> f r) -> f ()

Since: lens-4.16

traverse1Of_ :: Functor f => Getting (TraversedF r f) s a -> (a -> f r) -> s -> f () #

Traverse over all of the targets of a Fold1, computing an Apply based answer.

As long as you have Applicative or Functor effect you are better using traverseOf_. The traverse1Of_ is useful only when you have genuine Apply effect.

>>> traverse1Of_ both1 (\ks -> Map.fromList [ (k, ()) | k <- ks ]) ("abc", "bcd")
fromList [('b',()),('c',())]

traverse1Of_ :: Apply f => Fold1 s a -> (a -> f r) -> s -> f ()

Since: lens-4.16

sequenceAOf_ :: Functor f => Getting (Traversed a f) s (f a) -> s -> f () #

Evaluate each action in observed by a Fold on a structure from left to right, ignoring the results.

sequenceA_ ≡ sequenceAOf_ folded

>>> sequenceAOf_ both (putStrLn "hello",putStrLn "world")
hello
world

sequenceAOf_ :: Functor f     => Getter s (f a)     -> s -> f ()
sequenceAOf_ :: Applicative f => Fold s (f a)       -> s -> f ()
sequenceAOf_ :: Functor f     => Lens' s (f a)      -> s -> f ()
sequenceAOf_ :: Functor f     => Iso' s (f a)       -> s -> f ()
sequenceAOf_ :: Applicative f => Traversal' s (f a) -> s -> f ()
sequenceAOf_ :: Applicative f => Prism' s (f a)     -> s -> f ()

forOf_ :: Functor f => Getting (Traversed r f) s a -> s -> (a -> f r) -> f () #

Traverse over all of the targets of a Fold (or Getter), computing an Applicative (or Functor)-based answer, but unlike forOf do not construct a new structure. forOf_ generalizes for_ to work over any Fold.

When passed a Getter, forOf_ can work over any Functor, but when passed a Fold, forOf_ requires an Applicative.

for_ ≡ forOf_ folded

>>> forOf_ both ("hello","world") putStrLn
hello
world

The rather specific signature of forOf_ allows it to be used as if the signature was any of:

iforOf_ l s ≡ forOf_ l s . Indexed

forOf_ :: Functor f     => Getter s a     -> s -> (a -> f r) -> f ()
forOf_ :: Applicative f => Fold s a       -> s -> (a -> f r) -> f ()
forOf_ :: Functor f     => Lens' s a      -> s -> (a -> f r) -> f ()
forOf_ :: Functor f     => Iso' s a       -> s -> (a -> f r) -> f ()
forOf_ :: Applicative f => Traversal' s a -> s -> (a -> f r) -> f ()
forOf_ :: Applicative f => Prism' s a     -> s -> (a -> f r) -> f ()

traverseOf_ :: Functor f => Getting (Traversed r f) s a -> (a -> f r) -> s -> f () #

Traverse over all of the targets of a Fold (or Getter), computing an Applicative (or Functor)-based answer, but unlike traverseOf do not construct a new structure. traverseOf_ generalizes traverse_ to work over any Fold.

When passed a Getter, traverseOf_ can work over any Functor, but when passed a Fold, traverseOf_ requires an Applicative.

>>> traverseOf_ both putStrLn ("hello","world")
hello
world

traverse_ ≡ traverseOf_ folded

traverseOf_ _2 :: Functor f => (c -> f r) -> (d, c) -> f ()
traverseOf_ _Left :: Applicative f => (a -> f b) -> Either a c -> f ()

itraverseOf_ l ≡ traverseOf_ l . Indexed

The rather specific signature of traverseOf_ allows it to be used as if the signature was any of:

traverseOf_ :: Functor f     => Getter s a     -> (a -> f r) -> s -> f ()
traverseOf_ :: Applicative f => Fold s a       -> (a -> f r) -> s -> f ()
traverseOf_ :: Functor f     => Lens' s a      -> (a -> f r) -> s -> f ()
traverseOf_ :: Functor f     => Iso' s a       -> (a -> f r) -> s -> f ()
traverseOf_ :: Applicative f => Traversal' s a -> (a -> f r) -> s -> f ()
traverseOf_ :: Applicative f => Prism' s a     -> (a -> f r) -> s -> f ()

sumOf :: Num a => Getting (Endo (Endo a)) s a -> s -> a #

Calculate the Sum of every number targeted by a Fold.

>>> sumOf both (5,6)
11
>>> sumOf folded [1,2,3,4]
10
>>> sumOf (folded.both) [(1,2),(3,4)]
10
>>> import Data.Data.Lens
>>> sumOf biplate [(1::Int,[]),(2,[(3::Int,4::Int)])] :: Int
10

sum ≡ sumOf folded

This operation may be more strict than you would expect. If you want a lazier version use ala Sum . foldMapOf

sumOf _1 :: Num a => (a, b) -> a
sumOf (folded . _1) :: (Foldable f, Num a) => f (a, b) -> a

sumOf :: Num a => Getter s a     -> s -> a
sumOf :: Num a => Fold s a       -> s -> a
sumOf :: Num a => Lens' s a      -> s -> a
sumOf :: Num a => Iso' s a       -> s -> a
sumOf :: Num a => Traversal' s a -> s -> a
sumOf :: Num a => Prism' s a     -> s -> a

productOf :: Num a => Getting (Endo (Endo a)) s a -> s -> a #

Calculate the Product of every number targeted by a Fold.

>>> productOf both (4,5)
20
>>> productOf folded [1,2,3,4,5]
120

product ≡ productOf folded

This operation may be more strict than you would expect. If you want a lazier version use ala Product . foldMapOf

productOf :: Num a => Getter s a     -> s -> a
productOf :: Num a => Fold s a       -> s -> a
productOf :: Num a => Lens' s a      -> s -> a
productOf :: Num a => Iso' s a       -> s -> a
productOf :: Num a => Traversal' s a -> s -> a
productOf :: Num a => Prism' s a     -> s -> a

noneOf :: Getting Any s a -> (a -> Bool) -> s -> Bool #

Returns True only if no targets of a Fold satisfy a predicate.

>>> noneOf each (is _Nothing) (Just 3, Just 4, Just 5)
True
>>> noneOf (folded.folded) (<10) [[13,99,20],[3,71,42]]
False

inoneOf l = noneOf l . Indexed

noneOf :: Getter s a     -> (a -> Bool) -> s -> Bool
noneOf :: Fold s a       -> (a -> Bool) -> s -> Bool
noneOf :: Lens' s a      -> (a -> Bool) -> s -> Bool
noneOf :: Iso' s a       -> (a -> Bool) -> s -> Bool
noneOf :: Traversal' s a -> (a -> Bool) -> s -> Bool
noneOf :: Prism' s a     -> (a -> Bool) -> s -> Bool

allOf :: Getting All s a -> (a -> Bool) -> s -> Bool #

Returns True if every target of a Fold satisfies a predicate.

>>> allOf both (>=3) (4,5)
True
>>> allOf folded (>=2) [1..10]
False

all ≡ allOf folded

iallOf l = allOf l . Indexed

allOf :: Getter s a     -> (a -> Bool) -> s -> Bool
allOf :: Fold s a       -> (a -> Bool) -> s -> Bool
allOf :: Lens' s a      -> (a -> Bool) -> s -> Bool
allOf :: Iso' s a       -> (a -> Bool) -> s -> Bool
allOf :: Traversal' s a -> (a -> Bool) -> s -> Bool
allOf :: Prism' s a     -> (a -> Bool) -> s -> Bool

anyOf :: Getting Any s a -> (a -> Bool) -> s -> Bool #

Returns True if any target of a Fold satisfies a predicate.

>>> anyOf both (=='x') ('x','y')
True
>>> import Data.Data.Lens
>>> anyOf biplate (== "world") (((),2::Int),"hello",("world",11::Int))
True

any ≡ anyOf folded

ianyOf l ≡ anyOf l . Indexed

anyOf :: Getter s a     -> (a -> Bool) -> s -> Bool
anyOf :: Fold s a       -> (a -> Bool) -> s -> Bool
anyOf :: Lens' s a      -> (a -> Bool) -> s -> Bool
anyOf :: Iso' s a       -> (a -> Bool) -> s -> Bool
anyOf :: Traversal' s a -> (a -> Bool) -> s -> Bool
anyOf :: Prism' s a     -> (a -> Bool) -> s -> Bool

orOf :: Getting Any s Bool -> s -> Bool #

Returns True if any target of a Fold is True.

>>> orOf both (True,False)
True
>>> orOf both (False,False)
False

or ≡ orOf folded

orOf :: Getter s Bool     -> s -> Bool
orOf :: Fold s Bool       -> s -> Bool
orOf :: Lens' s Bool      -> s -> Bool
orOf :: Iso' s Bool       -> s -> Bool
orOf :: Traversal' s Bool -> s -> Bool
orOf :: Prism' s Bool     -> s -> Bool

andOf :: Getting All s Bool -> s -> Bool #

Returns True if every target of a Fold is True.

>>> andOf both (True,False)
False
>>> andOf both (True,True)
True

and ≡ andOf folded

andOf :: Getter s Bool     -> s -> Bool
andOf :: Fold s Bool       -> s -> Bool
andOf :: Lens' s Bool      -> s -> Bool
andOf :: Iso' s Bool       -> s -> Bool
andOf :: Traversal' s Bool -> s -> Bool
andOf :: Prism' s Bool     -> s -> Bool

(^..) :: s -> Getting (Endo [a]) s a -> [a] infixl 8 #

A convenient infix (flipped) version of toListOf.

>>> [[1,2],[3]]^..id
[[[1,2],[3]]]
>>> [[1,2],[3]]^..traverse
[[1,2],[3]]
>>> [[1,2],[3]]^..traverse.traverse
[1,2,3]

>>> (1,2)^..both
[1,2]

toList xs ≡ xs ^.. folded
(^..) ≡ flip toListOf

(^..) :: s -> Getter s a     -> a :: s -> Fold s a       -> a :: s -> Lens' s a      -> a :: s -> Iso' s a       -> a :: s -> Traversal' s a -> a :: s -> Prism' s a     -> [a]

toNonEmptyOf :: Getting (NonEmptyDList a) s a -> s -> NonEmpty a #

Extract a NonEmpty of the targets of Fold1.

>>> toNonEmptyOf both1 ("hello", "world")
"hello" :| ["world"]

toNonEmptyOf :: Getter s a      -> s -> NonEmpty a
toNonEmptyOf :: Fold1 s a       -> s -> NonEmpty a
toNonEmptyOf :: Lens' s a       -> s -> NonEmpty a
toNonEmptyOf :: Iso' s a        -> s -> NonEmpty a
toNonEmptyOf :: Traversal1' s a -> s -> NonEmpty a
toNonEmptyOf :: Prism' s a      -> s -> NonEmpty a

toListOf :: Getting (Endo [a]) s a -> s -> [a] #

Extract a list of the targets of a Fold. See also (^..).

toList ≡ toListOf folded
(^..) ≡ flip toListOf

foldlOf :: Getting (Dual (Endo r)) s a -> (r -> a -> r) -> r -> s -> r #

Left-associative fold of the parts of a structure that are viewed through a Lens, Getter, Fold or Traversal.

foldl ≡ foldlOf folded

foldlOf :: Getter s a     -> (r -> a -> r) -> r -> s -> r
foldlOf :: Fold s a       -> (r -> a -> r) -> r -> s -> r
foldlOf :: Lens' s a      -> (r -> a -> r) -> r -> s -> r
foldlOf :: Iso' s a       -> (r -> a -> r) -> r -> s -> r
foldlOf :: Traversal' s a -> (r -> a -> r) -> r -> s -> r
foldlOf :: Prism' s a     -> (r -> a -> r) -> r -> s -> r

foldrOf :: Getting (Endo r) s a -> (a -> r -> r) -> r -> s -> r #

Right-associative fold of parts of a structure that are viewed through a Lens, Getter, Fold or Traversal.

foldr ≡ foldrOf folded

foldrOf :: Getter s a     -> (a -> r -> r) -> r -> s -> r
foldrOf :: Fold s a       -> (a -> r -> r) -> r -> s -> r
foldrOf :: Lens' s a      -> (a -> r -> r) -> r -> s -> r
foldrOf :: Iso' s a       -> (a -> r -> r) -> r -> s -> r
foldrOf :: Traversal' s a -> (a -> r -> r) -> r -> s -> r
foldrOf :: Prism' s a     -> (a -> r -> r) -> r -> s -> r

ifoldrOf l ≡ foldrOf l . Indexed

foldrOf :: Getting (Endo r) s a -> (a -> r -> r) -> r -> s -> r

foldOf :: Getting a s a -> s -> a #

Combine the elements of a structure viewed through a Lens, Getter, Fold or Traversal using a monoid.

>>> foldOf (folded.folded) [[Sum 1,Sum 4],[Sum 8, Sum 8],[Sum 21]]
Sum {getSum = 42}

fold = foldOf folded

foldOf ≡ view

foldOf ::             Getter s m     -> s -> m
foldOf :: Monoid m => Fold s m       -> s -> m
foldOf ::             Lens' s m      -> s -> m
foldOf ::             Iso' s m       -> s -> m
foldOf :: Monoid m => Traversal' s m -> s -> m
foldOf :: Monoid m => Prism' s m     -> s -> m

foldMapOf :: Getting r s a -> (a -> r) -> s -> r #

Map each part of a structure viewed through a Lens, Getter, Fold or Traversal to a monoid and combine the results.

>>> foldMapOf (folded . both . _Just) Sum [(Just 21, Just 21)]
Sum {getSum = 42}

foldMap = foldMapOf folded

foldMapOf ≡ views
ifoldMapOf l = foldMapOf l . Indexed

foldMapOf ::                Getter s a      -> (a -> r) -> s -> r
foldMapOf :: Monoid r    => Fold s a        -> (a -> r) -> s -> r
foldMapOf :: Semigroup r => Fold1 s a       -> (a -> r) -> s -> r
foldMapOf ::                Lens' s a       -> (a -> r) -> s -> r
foldMapOf ::                Iso' s a        -> (a -> r) -> s -> r
foldMapOf :: Monoid r    => Traversal' s a  -> (a -> r) -> s -> r
foldMapOf :: Semigroup r => Traversal1' s a -> (a -> r) -> s -> r
foldMapOf :: Monoid r    => Prism' s a      -> (a -> r) -> s -> r

foldMapOf :: Getting r s a -> (a -> r) -> s -> r

lined :: forall (f :: Type -> Type). Applicative f => IndexedLensLike' Int f String String #

A Fold over the individual lines of a String.

lined :: Fold String String
lined :: Traversal' String String

lined :: IndexedFold Int String String
lined :: IndexedTraversal' Int String String

Note: This function type-checks as a Traversal but it doesn't satisfy the laws. It's only valid to use it when you don't insert any newline characters while traversing, and if your original String contains only isolated newline characters.

worded :: forall (f :: Type -> Type). Applicative f => IndexedLensLike' Int f String String #

A Fold over the individual words of a String.

worded :: Fold String String
worded :: Traversal' String String

worded :: IndexedFold Int String String
worded :: IndexedTraversal' Int String String

Note: This function type-checks as a Traversal but it doesn't satisfy the laws. It's only valid to use it when you don't insert any whitespace characters while traversing, and if your original String contains only isolated space characters (and no other characters that count as space, such as non-breaking spaces).

droppingWhile :: (Conjoined p, Profunctor q, Applicative f) => (a -> Bool) -> Optical p q (Compose (State Bool) f) s t a a -> Optical p q f s t a a #

Obtain a Fold by dropping elements from another Fold, Lens, Iso, Getter or Traversal while a predicate holds.

dropWhile p ≡ toListOf (droppingWhile p folded)

>>> toListOf (droppingWhile (<=3) folded) [1..6]
[4,5,6]

>>> toListOf (droppingWhile (<=3) folded) [1,6,1]
[6,1]

droppingWhile :: (a -> Bool) -> Fold s a                         -> Fold s a
droppingWhile :: (a -> Bool) -> Getter s a                       -> Fold s a
droppingWhile :: (a -> Bool) -> Traversal' s a                   -> Fold s a                -- see notes
droppingWhile :: (a -> Bool) -> Lens' s a                        -> Fold s a                -- see notes
droppingWhile :: (a -> Bool) -> Prism' s a                       -> Fold s a                -- see notes
droppingWhile :: (a -> Bool) -> Iso' s a                         -> Fold s a                -- see notes

droppingWhile :: (a -> Bool) -> IndexPreservingTraversal' s a    -> IndexPreservingFold s a -- see notes
droppingWhile :: (a -> Bool) -> IndexPreservingLens' s a         -> IndexPreservingFold s a -- see notes
droppingWhile :: (a -> Bool) -> IndexPreservingGetter s a        -> IndexPreservingFold s a
droppingWhile :: (a -> Bool) -> IndexPreservingFold s a          -> IndexPreservingFold s a

droppingWhile :: (a -> Bool) -> IndexedTraversal' i s a          -> IndexedFold i s a       -- see notes
droppingWhile :: (a -> Bool) -> IndexedLens' i s a               -> IndexedFold i s a       -- see notes
droppingWhile :: (a -> Bool) -> IndexedGetter i s a              -> IndexedFold i s a
droppingWhile :: (a -> Bool) -> IndexedFold i s a                -> IndexedFold i s a

Note: Many uses of this combinator will yield something that meets the types, but not the laws of a valid Traversal or IndexedTraversal. The Traversal and IndexedTraversal laws are only satisfied if the new values you assign to the first target also does not pass the predicate! Otherwise subsequent traversals will visit fewer elements and Traversal fusion is not sound.

So for any traversal t and predicate p, droppingWhile p t may not be lawful, but (dropping 1 . droppingWhile p) t is. For example:

>>> let l  :: Traversal' [Int] Int; l  = droppingWhile (<= 1) traverse
>>> let l' :: Traversal' [Int] Int; l' = dropping 1 l

l is not a lawful setter because over l f . over l g ≢ over l (f . g):

>>> [1,2,3] & l .~ 0 & l .~ 4
[1,0,0]
>>> [1,2,3] & l .~ 4
[1,4,4]

l' on the other hand behaves lawfully:

>>> [1,2,3] & l' .~ 0 & l' .~ 4
[1,2,4]
>>> [1,2,3] & l' .~ 4
[1,2,4]

takingWhile :: (Conjoined p, Applicative f) => (a -> Bool) -> Over p (TakingWhile p f a a) s t a a -> Over p f s t a a #

Obtain a Fold by taking elements from another Fold, Lens, Iso, Getter or Traversal while a predicate holds.

takeWhile p ≡ toListOf (takingWhile p folded)

>>> timingOut $ toListOf (takingWhile (<=3) folded) [1..]
[1,2,3]

takingWhile :: (a -> Bool) -> Fold s a                         -> Fold s a
takingWhile :: (a -> Bool) -> Getter s a                       -> Fold s a
takingWhile :: (a -> Bool) -> Traversal' s a                   -> Fold s a -- * See note below
takingWhile :: (a -> Bool) -> Lens' s a                        -> Fold s a -- * See note below
takingWhile :: (a -> Bool) -> Prism' s a                       -> Fold s a -- * See note below
takingWhile :: (a -> Bool) -> Iso' s a                         -> Fold s a -- * See note below
takingWhile :: (a -> Bool) -> IndexedTraversal' i s a          -> IndexedFold i s a -- * See note below
takingWhile :: (a -> Bool) -> IndexedLens' i s a               -> IndexedFold i s a -- * See note below
takingWhile :: (a -> Bool) -> IndexedFold i s a                -> IndexedFold i s a
takingWhile :: (a -> Bool) -> IndexedGetter i s a              -> IndexedFold i s a

Note: When applied to a Traversal, takingWhile yields something that can be used as if it were a Traversal, but which is not a Traversal per the laws, unless you are careful to ensure that you do not invalidate the predicate when writing back through it.

filteredBy :: (Indexable i p, Applicative f) => Getting (First i) a i -> p a (f a) -> a -> f a #

Obtain a potentially empty IndexedTraversal by taking the first element from another, potentially empty Fold and using it as an index.

The resulting optic can be composed with to filter another Lens, Iso, Getter, Fold (or Traversal).

>>> [(Just 2, 3), (Nothing, 4)] & mapped . filteredBy (_1 . _Just) <. _2 %@~ (*) :: [(Maybe Int, Int)]
[(Just 2,6),(Nothing,4)]

filteredBy :: Fold a i -> IndexedTraversal' i a a

Note: As with filtered, this is not a legal IndexedTraversal, unless you are very careful not to invalidate the predicate on the target!

filtered :: (Choice p, Applicative f) => (a -> Bool) -> Optic' p f a a #

Obtain a Fold that can be composed with to filter another Lens, Iso, Getter, Fold (or Traversal).

Note: This is not a legal Traversal, unless you are very careful not to invalidate the predicate on the target.

Note: This is also not a legal Prism, unless you are very careful not to inject a value that fails the predicate.

As a counter example, consider that given evens = filtered even the second Traversal law is violated:

over evens succ . over evens succ /= over evens (succ . succ)

So, in order for this to qualify as a legal Traversal you can only use it for actions that preserve the result of the predicate!

>>> [1..10]^..folded.filtered even
[2,4,6,8,10]

This will preserve an index if it is present.

iterated :: Apply f => (a -> a) -> LensLike' f a a #

x ^. iterated f returns an infinite Fold1 of repeated applications of f to x.

toListOf (iterated f) a ≡ iterate f a

iterated :: (a -> a) -> Fold1 a a

unfolded :: (b -> Maybe (a, b)) -> Fold b a #

Build a Fold that unfolds its values from a seed.

unfoldr ≡ toListOf . unfolded

>>> 10^..unfolded (\b -> if b == 0 then Nothing else Just (b, b-1))
[10,9,8,7,6,5,4,3,2,1]

cycled :: Apply f => LensLike f s t a b -> LensLike f s t a b #

Transform a non-empty Fold into a Fold1 that loops over its elements over and over.

>>> timingOut $ [1,2,3]^..taking 7 (cycled traverse)
[1,2,3,1,2,3,1]

cycled :: Fold1 s a -> Fold1 s a

replicated :: Int -> Fold a a #

A Fold that replicates its input n times.

replicate n ≡ toListOf (replicated n)

>>> 5^..replicated 20
[5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5]

repeated :: Apply f => LensLike' f a a #

Form a Fold1 by repeating the input forever.

repeat ≡ toListOf repeated

>>> timingOut $ 5^..taking 20 repeated
[5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5]

repeated :: Fold1 a a

folded64 :: forall (f :: TYPE LiftedRep -> Type) a. Foldable f => IndexedFold Int64 (f a) a #

Obtain a Fold from any Foldable indexed by ordinal position.

folded :: forall (f :: TYPE LiftedRep -> Type) a. Foldable f => IndexedFold Int (f a) a #

Obtain a Fold from any Foldable indexed by ordinal position.

>>> Just 3^..folded
[3]

>>> Nothing^..folded
[]

>>> [(1,2),(3,4)]^..folded.both
[1,2,3,4]

ifoldring :: (Indexable i p, Contravariant f, Applicative f) => ((i -> a -> f a -> f a) -> f a -> s -> f a) -> Over p f s t a b #

Obtain FoldWithIndex by lifting ifoldr like function.

foldring :: (Contravariant f, Applicative f) => ((a -> f a -> f a) -> f a -> s -> f a) -> LensLike f s t a b #

Obtain a Fold by lifting foldr like function.

>>> [1,2,3,4]^..foldring foldr
[1,2,3,4]

ifolding :: (Foldable f, Indexable i p, Contravariant g, Applicative g) => (s -> f (i, a)) -> Over p g s t a b #

folding :: Foldable f => (s -> f a) -> Fold s a #

Obtain a Fold by lifting an operation that returns a Foldable result.

This can be useful to lift operations from Data.List and elsewhere into a Fold.

>>> [1,2,3,4]^..folding tail
[2,3,4]

_Show :: (Read a, Show a) => Prism' String a #

This is an improper prism for text formatting based on Read and Show.

This Prism is "improper" in the sense that it normalizes the text formatting, but round tripping is idempotent given sane Read/Show instances.

>>> _Show # 2
"2"

>>> "EQ" ^? _Show :: Maybe Ordering
Just EQ

_Show ≡ prism' show readMaybe

nearly :: a -> (a -> Bool) -> Prism' a () #

This Prism compares for approximate equality with a given value and a predicate for testing, an example where the value is the empty list and the predicate checks that a list is empty (same as _Empty with the AsEmpty list instance):

>>> nearly [] null # ()
[]
>>> [1,2,3,4] ^? nearly [] null
Nothing

nearly [] null :: Prism' [a] ()

To comply with the Prism laws the arguments you supply to nearly a p are somewhat constrained.

We assume p x holds iff x ≡ a. Under that assumption then this is a valid Prism.

This is useful when working with a type where you can test equality for only a subset of its values, and the prism selects such a value.

only :: Eq a => a -> Prism' a () #

This Prism compares for exact equality with a given value.

>>> only 4 # ()
4

>>> 5 ^? only 4
Nothing

_Void :: Prism s s a Void #

Void is a logically uninhabited data type.

This is a Prism that will always fail to match.

_Nothing :: Prism' (Maybe a) () #

This Prism provides the Traversal of a Nothing in a Maybe.

>>> Nothing ^? _Nothing
Just ()

>>> Just () ^? _Nothing
Nothing

But you can turn it around and use it to construct Nothing as well:

>>> _Nothing # ()
Nothing

_Just :: Prism (Maybe a) (Maybe b) a b #

This Prism provides a Traversal for tweaking the target of the value of Just in a Maybe.

>>> over _Just (+1) (Just 2)
Just 3

Unlike traverse this is a Prism, and so you can use it to inject as well:

>>> _Just # 5
Just 5

>>> 5^.re _Just
Just 5

Interestingly,

m ^? _Just ≡ m

>>> Just x ^? _Just
Just x

>>> Nothing ^? _Just
Nothing

_Right :: Prism (Either c a) (Either c b) a b #

This Prism provides a Traversal for tweaking the Right half of an Either:

>>> over _Right (+1) (Left 2)
Left 2

>>> over _Right (+1) (Right 2)
Right 3

>>> Right "hello" ^._Right
"hello"

>>> Left "hello" ^._Right :: [Double]
[]

It also can be turned around to obtain the embedding into the Right half of an Either:

>>> _Right # 5
Right 5

>>> 5^.re _Right
Right 5

_Left :: Prism (Either a c) (Either b c) a b #

This Prism provides a Traversal for tweaking the Left half of an Either:

>>> over _Left (+1) (Left 2)
Left 3

>>> over _Left (+1) (Right 2)
Right 2

>>> Right 42 ^._Left :: String
""

>>> Left "hello" ^._Left
"hello"

It also can be turned around to obtain the embedding into the Left half of an Either:

>>> _Left # 5
Left 5

>>> 5^.re _Left
Left 5

matching' :: LensLike (Either a) s t a b -> s -> Either t a #

Like matching, but also works for combinations of Lens and Prisms, and also Traversals.

>>> matching' (_2 . _Just) ('x', Just True)
Right True

>>> matching' (_2 . _Just) ('x', Nothing :: Maybe Int) :: Either (Char, Maybe Bool) Int
Left ('x',Nothing)

>>> matching' traverse "" :: Either [Int] Char
Left []

>>> matching' traverse "xyz" :: Either [Int] Char
Right 'x'

matching :: APrism s t a b -> s -> Either t a #

Retrieve the value targeted by a Prism or return the original value while allowing the type to change if it does not match.

>>> matching _Just (Just 12)
Right 12

>>> matching _Just (Nothing :: Maybe Int) :: Either (Maybe Bool) Int
Left Nothing

isn't :: APrism s t a b -> s -> Bool #

Check to see if this Prism doesn't match.

>>> isn't _Left (Right 12)
True

>>> isn't _Left (Left 12)
False

>>> isn't _Empty []
False

isn't = not . is
isn't = hasn't

below :: forall (f :: Type -> Type) s a. Traversable f => APrism' s a -> Prism' (f s) (f a) #

lift a Prism through a Traversable functor, giving a Prism that matches only if all the elements of the container match the Prism.

>>> [Left 1, Right "foo", Left 4, Right "woot"]^..below _Right
[]

>>> [Right "hail hydra!", Right "foo", Right "blah", Right "woot"]^..below _Right
[["hail hydra!","foo","blah","woot"]]

aside :: APrism s t a b -> Prism (e, s) (e, t) (e, a) (e, b) #

Use a Prism to work over part of a structure.

without :: APrism s t a b -> APrism u v c d -> Prism (Either s u) (Either t v) (Either a c) (Either b d) #

Given a pair of prisms, project sums.

Viewing a Prism as a co-Lens, this combinator can be seen to be dual to alongside.

prism' :: (b -> s) -> (s -> Maybe a) -> Prism s s a b #

This is usually used to build a Prism', when you have to use an operation like cast which already returns a Maybe.

prism :: (b -> t) -> (s -> Either t a) -> Prism s t a b #

Build a Prism.

Either t a is used instead of Maybe a to permit the types of s and t to differ.

clonePrism :: APrism s t a b -> Prism s t a b #

Clone a Prism so that you can reuse the same monomorphically typed Prism for different purposes.

See cloneLens and cloneTraversal for examples of why you might want to do this.

withPrism :: APrism s t a b -> ((b -> t) -> (s -> Either t a) -> r) -> r #

Convert APrism to the pair of functions that characterize it.

type APrism s t a b = Market a b a (Identity b) -> Market a b s (Identity t) #

If you see this in a signature for a function, the function is expecting a Prism.

type APrism' s a = APrism s s a a #

type APrism' = Simple APrism

class Prefixed t where #

Methods

prefixed :: t -> Prism' t t #

A Prism stripping a prefix from a sequence when used as a Traversal, or prepending that prefix when run backwards:

>>> "preview" ^? prefixed "pre"
Just "view"

>>> "review" ^? prefixed "pre"
Nothing

>>> prefixed "pre" # "amble"
"preamble"

Instances

Instances details

Prefixed ByteString
Instance details Defined in Control.Lens.Prism Methods prefixed :: ByteString -> Prism' ByteString ByteString #
Prefixed ByteString
Instance details Defined in Control.Lens.Prism Methods prefixed :: ByteString -> Prism' ByteString ByteString #
Prefixed Text
Instance details Defined in Control.Lens.Prism Methods prefixed :: Text -> Prism' Text Text #
Prefixed Text
Instance details Defined in Control.Lens.Prism Methods prefixed :: Text -> Prism' Text Text #
Eq a => Prefixed [a]
Instance details Defined in Control.Lens.Prism Methods prefixed :: [a] -> Prism' [a] [a] #

class Suffixed t where #

Methods

suffixed :: t -> Prism' t t #

A Prism stripping a suffix from a sequence when used as a Traversal, or appending that suffix when run backwards:

>>> "review" ^? suffixed "view"
Just "re"

>>> "review" ^? suffixed "tire"
Nothing

>>> suffixed ".o" # "hello"
"hello.o"

Instances

Instances details

Suffixed ByteString
Instance details Defined in Control.Lens.Prism Methods suffixed :: ByteString -> Prism' ByteString ByteString #
Suffixed ByteString
Instance details Defined in Control.Lens.Prism Methods suffixed :: ByteString -> Prism' ByteString ByteString #
Suffixed Text
Instance details Defined in Control.Lens.Prism Methods suffixed :: Text -> Prism' Text Text #
Suffixed Text
Instance details Defined in Control.Lens.Prism Methods suffixed :: Text -> Prism' Text Text #
Eq a => Suffixed [a]
Instance details Defined in Control.Lens.Prism Methods suffixed :: [a] -> Prism' [a] [a] #

reviewing :: (Bifunctor p, Functor f) => Optic (Tagged :: Type -> Type -> Type) Identity s t a b -> Optic' p f t b #

Coerce a polymorphic Prism to a Review.

reviewing :: Iso s t a b -> Review t b
reviewing :: Prism s t a b -> Review t b

reuses :: MonadState b m => AReview t b -> (t -> r) -> m r #

This can be used to turn an Iso or Prism around and use the current state through it the other way, applying a function.

reuses ≡ uses . re
reuses (unto f) g ≡ gets (g . f)

>>> evalState (reuses _Left isLeft) (5 :: Int)
True

reuses :: MonadState a m => Prism' s a -> (s -> r) -> m r
reuses :: MonadState a m => Iso' s a   -> (s -> r) -> m r

reuse :: MonadState b m => AReview t b -> m t #

This can be used to turn an Iso or Prism around and use a value (or the current environment) through it the other way.

reuse ≡ use . re
reuse . unto ≡ gets

>>> evalState (reuse _Left) 5
Left 5

>>> evalState (reuse (unto succ)) 5
6

reuse :: MonadState a m => Prism' s a -> m s
reuse :: MonadState a m => Iso' s a   -> m s

reviews :: MonadReader b m => AReview t b -> (t -> r) -> m r #

This can be used to turn an Iso or Prism around and view a value (or the current environment) through it the other way, applying a function.

reviews ≡ views . re
reviews (unto f) g ≡ g . f

>>> reviews _Left isRight "mustard"
False

>>> reviews (unto succ) (*2) 3
8

Usually this function is used in the (->) Monad with a Prism or Iso, in which case it may be useful to think of it as having one of these more restricted type signatures:

reviews :: Iso' s a   -> (s -> r) -> a -> r
reviews :: Prism' s a -> (s -> r) -> a -> r

However, when working with a Monad transformer stack, it is sometimes useful to be able to review the current environment, in which case it may be beneficial to think of it as having one of these slightly more liberal type signatures:

reviews :: MonadReader a m => Iso' s a   -> (s -> r) -> m r
reviews :: MonadReader a m => Prism' s a -> (s -> r) -> m r

review :: MonadReader b m => AReview t b -> m t #

This can be used to turn an Iso or Prism around and view a value (or the current environment) through it the other way.

review ≡ view . re
review . unto ≡ id

>>> review _Left "mustard"
Left "mustard"

>>> review (unto succ) 5
6

Usually review is used in the (->) Monad with a Prism or Iso, in which case it may be useful to think of it as having one of these more restricted type signatures:

review :: Iso' s a   -> a -> s
review :: Prism' s a -> a -> s

However, when working with a Monad transformer stack, it is sometimes useful to be able to review the current environment, in which case it may be beneficial to think of it as having one of these slightly more liberal type signatures:

review :: MonadReader a m => Iso' s a   -> m s
review :: MonadReader a m => Prism' s a -> m s

re :: AReview t b -> Getter b t #

Turn a Prism or Iso around to build a Getter.

If you have an Iso, from is a more powerful version of this function that will return an Iso instead of a mere Getter.

>>> 5 ^.re _Left
Left 5

>>> 6 ^.re (_Left.unto succ)
Left 7

review  ≡ view  . re
reviews ≡ views . re
reuse   ≡ use   . re
reuses  ≡ uses  . re

re :: Prism s t a b -> Getter b t
re :: Iso s t a b   -> Getter b t

un :: (Profunctor p, Bifunctor p, Functor f) => Getting a s a -> Optic' p f a s #

Turn a Getter around to get a Review

un = unto . view
unto = un . to

>>> un (to length) # [1,2,3]
3

unto :: (Profunctor p, Bifunctor p, Functor f) => (b -> t) -> Optic p f s t a b #

An analogue of to for review.

unto :: (b -> t) -> Review' t b

unto = un . to

getting :: (Profunctor p, Profunctor q, Functor f, Contravariant f) => Optical p q f s t a b -> Optical' p q f s a #

Coerce a Getter-compatible Optical to an Optical'. This is useful when using a Traversal that is not simple as a Getter or a Fold.

getting :: Traversal s t a b          -> Fold s a
getting :: Lens s t a b               -> Getter s a
getting :: IndexedTraversal i s t a b -> IndexedFold i s a
getting :: IndexedLens i s t a b      -> IndexedGetter i s a

(^@.) :: s -> IndexedGetting i (i, a) s a -> (i, a) infixl 8 #

View the index and value of an IndexedGetter or IndexedLens.

This is the same operation as iview with the arguments flipped.

The fixity and semantics are such that subsequent field accesses can be performed with (.).

(^@.) :: s -> IndexedGetter i s a -> (i, a)
(^@.) :: s -> IndexedLens' i s a  -> (i, a)

The result probably doesn't have much meaning when applied to an IndexedFold.

iuses :: MonadState s m => IndexedGetting i r s a -> (i -> a -> r) -> m r #

Use a function of the index and value of an IndexedGetter into the current state.

When applied to an IndexedFold the result will be a monoidal summary instead of a single answer.

iuse :: MonadState s m => IndexedGetting i (i, a) s a -> m (i, a) #

Use the index and value of an IndexedGetter into the current state as a pair.

When applied to an IndexedFold the result will most likely be a nonsensical monoidal summary of the indices tupled with a monoidal summary of the values and probably not whatever it is you wanted.

iviews :: MonadReader s m => IndexedGetting i r s a -> (i -> a -> r) -> m r #

View a function of the index and value of an IndexedGetter into the current environment.

When applied to an IndexedFold the result will be a monoidal summary instead of a single answer.

iviews ≡ ifoldMapOf

iview :: MonadReader s m => IndexedGetting i (i, a) s a -> m (i, a) #

View the index and value of an IndexedGetter into the current environment as a pair.

When applied to an IndexedFold the result will most likely be a nonsensical monoidal summary of the indices tupled with a monoidal summary of the values and probably not whatever it is you wanted.

ilistenings :: MonadWriter w m => IndexedGetting i v w u -> (i -> u -> v) -> m a -> m (a, v) #

This is a generalized form of listen that only extracts the portion of the log that is focused on by a Getter. If given a Fold or a Traversal then a monoidal summary of the parts of the log that are visited will be returned.

ilistenings :: MonadWriter w m             => IndexedGetter w u     -> (i -> u -> v) -> m a -> m (a, v)
ilistenings :: MonadWriter w m             => IndexedLens' w u      -> (i -> u -> v) -> m a -> m (a, v)
ilistenings :: (MonadWriter w m, Monoid v) => IndexedFold w u       -> (i -> u -> v) -> m a -> m (a, v)
ilistenings :: (MonadWriter w m, Monoid v) => IndexedTraversal' w u -> (i -> u -> v) -> m a -> m (a, v)

listenings :: MonadWriter w m => Getting v w u -> (u -> v) -> m a -> m (a, v) #

This is a generalized form of listen that only extracts the portion of the log that is focused on by a Getter. If given a Fold or a Traversal then a monoidal summary of the parts of the log that are visited will be returned.

listenings :: MonadWriter w m             => Getter w u     -> (u -> v) -> m a -> m (a, v)
listenings :: MonadWriter w m             => Lens' w u      -> (u -> v) -> m a -> m (a, v)
listenings :: MonadWriter w m             => Iso' w u       -> (u -> v) -> m a -> m (a, v)
listenings :: (MonadWriter w m, Monoid v) => Fold w u       -> (u -> v) -> m a -> m (a, v)
listenings :: (MonadWriter w m, Monoid v) => Traversal' w u -> (u -> v) -> m a -> m (a, v)
listenings :: (MonadWriter w m, Monoid v) => Prism' w u     -> (u -> v) -> m a -> m (a, v)

ilistening :: MonadWriter w m => IndexedGetting i (i, u) w u -> m a -> m (a, (i, u)) #

This is a generalized form of listen that only extracts the portion of the log that is focused on by a Getter. If given a Fold or a Traversal then a monoidal summary of the parts of the log that are visited will be returned.

ilistening :: MonadWriter w m             => IndexedGetter i w u     -> m a -> m (a, (i, u))
ilistening :: MonadWriter w m             => IndexedLens' i w u      -> m a -> m (a, (i, u))
ilistening :: (MonadWriter w m, Monoid u) => IndexedFold i w u       -> m a -> m (a, (i, u))
ilistening :: (MonadWriter w m, Monoid u) => IndexedTraversal' i w u -> m a -> m (a, (i, u))

listening :: MonadWriter w m => Getting u w u -> m a -> m (a, u) #

This is a generalized form of listen that only extracts the portion of the log that is focused on by a Getter. If given a Fold or a Traversal then a monoidal summary of the parts of the log that are visited will be returned.

listening :: MonadWriter w m             => Getter w u     -> m a -> m (a, u)
listening :: MonadWriter w m             => Lens' w u      -> m a -> m (a, u)
listening :: MonadWriter w m             => Iso' w u       -> m a -> m (a, u)
listening :: (MonadWriter w m, Monoid u) => Fold w u       -> m a -> m (a, u)
listening :: (MonadWriter w m, Monoid u) => Traversal' w u -> m a -> m (a, u)
listening :: (MonadWriter w m, Monoid u) => Prism' w u     -> m a -> m (a, u)

uses :: MonadState s m => LensLike' (Const r :: Type -> Type) s a -> (a -> r) -> m r #

Use the target of a Lens, Iso or Getter in the current state, or use a summary of a Fold or Traversal that points to a monoidal value.

>>> evalState (uses _1 length) ("hello","world")
5

uses :: MonadState s m             => Getter s a     -> (a -> r) -> m r
uses :: (MonadState s m, Monoid r) => Fold s a       -> (a -> r) -> m r
uses :: MonadState s m             => Lens' s a      -> (a -> r) -> m r
uses :: MonadState s m             => Iso' s a       -> (a -> r) -> m r
uses :: (MonadState s m, Monoid r) => Traversal' s a -> (a -> r) -> m r

uses :: MonadState s m => Getting r s t a b -> (a -> r) -> m r

use :: MonadState s m => Getting a s a -> m a #

Use the target of a Lens, Iso, or Getter in the current state, or use a summary of a Fold or Traversal that points to a monoidal value.

>>> evalState (use _1) (a,b)
a

>>> evalState (use _1) ("hello","world")
"hello"

use :: MonadState s m             => Getter s a     -> m a
use :: (MonadState s m, Monoid r) => Fold s r       -> m r
use :: MonadState s m             => Iso' s a       -> m a
use :: MonadState s m             => Lens' s a      -> m a
use :: (MonadState s m, Monoid r) => Traversal' s r -> m r

(^.) :: s -> Getting a s a -> a infixl 8 #

View the value pointed to by a Getter or Lens or the result of folding over all the results of a Fold or Traversal that points at a monoidal values.

This is the same operation as view with the arguments flipped.

The fixity and semantics are such that subsequent field accesses can be performed with (.).

>>> (a,b)^._2
b

>>> ("hello","world")^._2
"world"

>>> import Data.Complex
>>> ((0, 1 :+ 2), 3)^._1._2.to magnitude
2.23606797749979

(^.) ::             s -> Getter s a     -> a
(^.) :: Monoid m => s -> Fold s m       -> m
(^.) ::             s -> Iso' s a       -> a
(^.) ::             s -> Lens' s a      -> a
(^.) :: Monoid m => s -> Traversal' s m -> m

views :: MonadReader s m => LensLike' (Const r :: Type -> Type) s a -> (a -> r) -> m r #

View a function of the value pointed to by a Getter or Lens or the result of folding over the result of mapping the targets of a Fold or Traversal.

views l f ≡ view (l . to f)

>>> views (to f) g a
g (f a)

>>> views _2 length (1,"hello")
5

As views is commonly used to access the target of a Getter or obtain a monoidal summary of the targets of a Fold, It may be useful to think of it as having one of these more restricted signatures:

views ::             Getter s a     -> (a -> r) -> s -> r
views :: Monoid m => Fold s a       -> (a -> m) -> s -> m
views ::             Iso' s a       -> (a -> r) -> s -> r
views ::             Lens' s a      -> (a -> r) -> s -> r
views :: Monoid m => Traversal' s a -> (a -> m) -> s -> m

In a more general setting, such as when working with a Monad transformer stack you can use:

views :: MonadReader s m             => Getter s a     -> (a -> r) -> m r
views :: (MonadReader s m, Monoid r) => Fold s a       -> (a -> r) -> m r
views :: MonadReader s m             => Iso' s a       -> (a -> r) -> m r
views :: MonadReader s m             => Lens' s a      -> (a -> r) -> m r
views :: (MonadReader s m, Monoid r) => Traversal' s a -> (a -> r) -> m r

views :: MonadReader s m => Getting r s a -> (a -> r) -> m r

view :: MonadReader s m => Getting a s a -> m a #

View the value pointed to by a Getter, Iso or Lens or the result of folding over all the results of a Fold or Traversal that points at a monoidal value.

view . to ≡ id

>>> view (to f) a
f a

>>> view _2 (1,"hello")
"hello"

>>> view (to succ) 5
6

>>> view (_2._1) ("hello",("world","!!!"))
"world"

As view is commonly used to access the target of a Getter or obtain a monoidal summary of the targets of a Fold, It may be useful to think of it as having one of these more restricted signatures:

view ::             Getter s a     -> s -> a
view :: Monoid m => Fold s m       -> s -> m
view ::             Iso' s a       -> s -> a
view ::             Lens' s a      -> s -> a
view :: Monoid m => Traversal' s m -> s -> m

In a more general setting, such as when working with a Monad transformer stack you can use:

view :: MonadReader s m             => Getter s a     -> m a
view :: (MonadReader s m, Monoid a) => Fold s a       -> m a
view :: MonadReader s m             => Iso' s a       -> m a
view :: MonadReader s m             => Lens' s a      -> m a
view :: (MonadReader s m, Monoid a) => Traversal' s a -> m a

ilike :: (Indexable i p, Contravariant f, Functor f) => i -> a -> Over' p f s a #

ilike :: i -> a -> IndexedGetter i s a

like :: (Profunctor p, Contravariant f, Functor f) => a -> Optic' p f s a #

Build an constant-valued (index-preserving) Getter from an arbitrary Haskell value.

like a . like b ≡ like b
a ^. like b ≡ b
a ^. like b ≡ a ^. to (const b)

This can be useful as a second case failing a Fold e.g. foo failing like 0

like :: a -> IndexPreservingGetter s a

ito :: (Indexable i p, Contravariant f) => (s -> (i, a)) -> Over' p f s a #

ito :: (s -> (i, a)) -> IndexedGetter i s a

to :: (Profunctor p, Contravariant f) => (s -> a) -> Optic' p f s a #

Build an (index-preserving) Getter from an arbitrary Haskell function.

to f . to g ≡ to (g . f)

a ^. to f ≡ f a

>>> a ^.to f
f a

>>> ("hello","world")^.to snd
"world"

>>> 5^.to succ
6

>>> (0, -5)^._2.to abs
5

to :: (s -> a) -> IndexPreservingGetter s a

type Getting r s a = (a -> Const r a) -> s -> Const r s #

When you see this in a type signature it indicates that you can pass the function a Lens, Getter, Traversal, Fold, Prism, Iso, or one of the indexed variants, and it will just "do the right thing".

Most Getter combinators are able to be used with both a Getter or a Fold in limited situations, to do so, they need to be monomorphic in what we are going to extract with Const. To be compatible with Lens, Traversal and Iso we also restricted choices of the irrelevant t and b parameters.

If a function accepts a Getting r s a, then when r is a Monoid, then you can pass a Fold (or Traversal), otherwise you can only pass this a Getter or Lens.

type IndexedGetting i m s a = Indexed i a (Const m a) -> s -> Const m s #

Used to consume an IndexedFold.

type Accessing (p :: Type -> Type -> Type) m s a = p a (Const m a) -> s -> Const m s #

This is a convenient alias used when consuming (indexed) getters and (indexed) folds in a highly general fashion.

_19' :: Field19 s t a b => Lens s t a b #

Strict version of _19

_18' :: Field18 s t a b => Lens s t a b #

Strict version of _18

_17' :: Field17 s t a b => Lens s t a b #

Strict version of _17

_16' :: Field16 s t a b => Lens s t a b #

Strict version of _16

_15' :: Field15 s t a b => Lens s t a b #

Strict version of _15

_14' :: Field14 s t a b => Lens s t a b #

Strict version of _14

_13' :: Field13 s t a b => Lens s t a b #

Strict version of _13

_12' :: Field12 s t a b => Lens s t a b #

Strict version of _12

_11' :: Field11 s t a b => Lens s t a b #

Strict version of _11

_10' :: Field10 s t a b => Lens s t a b #

Strict version of _10

_9' :: Field9 s t a b => Lens s t a b #

Strict version of _9

_8' :: Field8 s t a b => Lens s t a b #

Strict version of _8

_7' :: Field7 s t a b => Lens s t a b #

Strict version of _7

_6' :: Field6 s t a b => Lens s t a b #

Strict version of _6

_5' :: Field5 s t a b => Lens s t a b #

Strict version of _5

_4' :: Field4 s t a b => Lens s t a b #

Strict version of _4

_3' :: Field3 s t a b => Lens s t a b #

Strict version of _3

_2' :: Field2 s t a b => Lens s t a b #

Strict version of _2

_1' :: Field1 s t a b => Lens s t a b #

Strict version of _1

class Field1 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to 1st field of a tuple.

Minimal complete definition

Nothing

Methods

_1 :: Lens s t a b #

Access the 1st field of a tuple (and possibly change its type).

>>> (1,2)^._1
1

>>> _1 .~ "hello" $ (1,2)
("hello",2)

>>> (1,2) & _1 .~ "hello"
("hello",2)

>>> _1 putStrLn ("hello","world")
hello
((),"world")

This can also be used on larger tuples as well:

>>> (1,2,3,4,5) & _1 +~ 41
(42,2,3,4,5)

_1 :: Lens (a,b) (a',b) a a'
_1 :: Lens (a,b,c) (a',b,c) a a'
_1 :: Lens (a,b,c,d) (a',b,c,d) a a'
...
_1 :: Lens (a,b,c,d,e,f,g,h,i) (a',b,c,d,e,f,g,h,i) a a'

Instances

Instances details

Field1 (Identity a) (Identity b) a b
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (Identity a) (Identity b) a b #
Field1 (Plucker a) (Plucker a) a a
Instance details Defined in Linear.Plucker Methods _1 :: Lens (Plucker a) (Plucker a) a a #
Field1 (Quaternion a) (Quaternion a) a a
Instance details Defined in Linear.Quaternion Methods _1 :: Lens (Quaternion a) (Quaternion a) a a #
Field1 (V1 a) (V1 b) a b
Instance details Defined in Linear.V1 Methods _1 :: Lens (V1 a) (V1 b) a b #
Field1 (V2 a) (V2 a) a a
Instance details Defined in Linear.V2 Methods _1 :: Lens (V2 a) (V2 a) a a #
Field1 (V3 a) (V3 a) a a
Instance details Defined in Linear.V3 Methods _1 :: Lens (V3 a) (V3 a) a a #
Field1 (V4 a) (V4 a) a a
Instance details Defined in Linear.V4 Methods _1 :: Lens (V4 a) (V4 a) a a #
Field1 (Pair a b) (Pair a' b) a a'	Since: lens-4.20
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (Pair a b) (Pair a' b) a a' #
Field1 (a, b) (a', b) a a'	`_1` k ~(a,b) = (\a' -> (a',b)) `<$>` k a
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b) (a', b) a a' #
1 <= n => Field1 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _1 :: Lens (V n a) (V n a) a a #
Field1 (a, b, c) (a', b, c) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c) (a', b, c) a a' #
Field1 (a, b, c, d) (a', b, c, d) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d) (a', b, c, d) a a' #
Field1 (Product f g a) (Product f' g a) (f a) (f' a)
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (Product f g a) (Product f' g a) (f a) (f' a) #
Field1 ((f :: g) p) ((f' :: g) p) (f p) (f' p)
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens ((f :: g) p) ((f' :: g) p) (f p) (f' p) #
Field1 (a, b, c, d, e) (a', b, c, d, e) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e) (a', b, c, d, e) a a' #
Field1 (a, b, c, d, e, f) (a', b, c, d, e, f) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f) (a', b, c, d, e, f) a a' #
Field1 (a, b, c, d, e, f, g) (a', b, c, d, e, f, g) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f, g) (a', b, c, d, e, f, g) a a' #
Field1 (a, b, c, d, e, f, g, h) (a', b, c, d, e, f, g, h) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f, g, h) (a', b, c, d, e, f, g, h) a a' #
Field1 (a, b, c, d, e, f, g, h, i) (a', b, c, d, e, f, g, h, i) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f, g, h, i) (a', b, c, d, e, f, g, h, i) a a' #
Field1 (a, b, c, d, e, f, g, h, i, j) (a', b, c, d, e, f, g, h, i, j) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f, g, h, i, j) (a', b, c, d, e, f, g, h, i, j) a a' #
Field1 (a, b, c, d, e, f, g, h, i, j, kk) (a', b, c, d, e, f, g, h, i, j, kk) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f, g, h, i, j, kk) (a', b, c, d, e, f, g, h, i, j, kk) a a' #
Field1 (a, b, c, d, e, f, g, h, i, j, kk, l) (a', b, c, d, e, f, g, h, i, j, kk, l) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l) (a', b, c, d, e, f, g, h, i, j, kk, l) a a' #
Field1 (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a', b, c, d, e, f, g, h, i, j, kk, l, m) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a', b, c, d, e, f, g, h, i, j, kk, l, m) a a' #
Field1 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a', b, c, d, e, f, g, h, i, j, kk, l, m, n) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a', b, c, d, e, f, g, h, i, j, kk, l, m, n) a a' #
Field1 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a', b, c, d, e, f, g, h, i, j, kk, l, m, n, o) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a', b, c, d, e, f, g, h, i, j, kk, l, m, n, o) a a' #
Field1 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a', b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a', b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) a a' #
Field1 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a', b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a', b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) a a' #
Field1 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a', b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a', b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) a a' #
Field1 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a', b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) a a'
Instance details Defined in Control.Lens.Tuple Methods _1 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a', b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) a a' #

class Field2 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 2nd field of a tuple.

Minimal complete definition

Nothing

Methods

_2 :: Lens s t a b #

Access the 2nd field of a tuple.

>>> _2 .~ "hello" $ (1,(),3,4)
(1,"hello",3,4)

>>> (1,2,3,4) & _2 *~ 3
(1,6,3,4)

>>> _2 print (1,2)
2
(1,())

anyOf _2 :: (s -> Bool) -> (a, s) -> Bool
traverse . _2 :: (Applicative f, Traversable t) => (a -> f b) -> t (s, a) -> f (t (s, b))
foldMapOf (traverse . _2) :: (Traversable t, Monoid m) => (s -> m) -> t (b, s) -> m

Instances

Instances details

Field2 (Plucker a) (Plucker a) a a
Instance details Defined in Linear.Plucker Methods _2 :: Lens (Plucker a) (Plucker a) a a #
Field2 (Quaternion a) (Quaternion a) a a
Instance details Defined in Linear.Quaternion Methods _2 :: Lens (Quaternion a) (Quaternion a) a a #
Field2 (V2 a) (V2 a) a a
Instance details Defined in Linear.V2 Methods _2 :: Lens (V2 a) (V2 a) a a #
Field2 (V3 a) (V3 a) a a
Instance details Defined in Linear.V3 Methods _2 :: Lens (V3 a) (V3 a) a a #
Field2 (V4 a) (V4 a) a a
Instance details Defined in Linear.V4 Methods _2 :: Lens (V4 a) (V4 a) a a #
Field2 (Pair a b) (Pair a b') b b'	Since: lens-4.20
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (Pair a b) (Pair a b') b b' #
Field2 (a, b) (a, b') b b'	`_2` k ~(a,b) = (\b' -> (a,b')) `<$>` k b
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b) (a, b') b b' #
2 <= n => Field2 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _2 :: Lens (V n a) (V n a) a a #
Field2 (a, b, c) (a, b', c) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c) (a, b', c) b b' #
Field2 (a, b, c, d) (a, b', c, d) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d) (a, b', c, d) b b' #
Field2 (Product f g a) (Product f g' a) (g a) (g' a)
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (Product f g a) (Product f g' a) (g a) (g' a) #
Field2 ((f :: g) p) ((f :: g') p) (g p) (g' p)
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens ((f :: g) p) ((f :: g') p) (g p) (g' p) #
Field2 (a, b, c, d, e) (a, b', c, d, e) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e) (a, b', c, d, e) b b' #
Field2 (a, b, c, d, e, f) (a, b', c, d, e, f) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f) (a, b', c, d, e, f) b b' #
Field2 (a, b, c, d, e, f, g) (a, b', c, d, e, f, g) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f, g) (a, b', c, d, e, f, g) b b' #
Field2 (a, b, c, d, e, f, g, h) (a, b', c, d, e, f, g, h) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f, g, h) (a, b', c, d, e, f, g, h) b b' #
Field2 (a, b, c, d, e, f, g, h, i) (a, b', c, d, e, f, g, h, i) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f, g, h, i) (a, b', c, d, e, f, g, h, i) b b' #
Field2 (a, b, c, d, e, f, g, h, i, j) (a, b', c, d, e, f, g, h, i, j) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f, g, h, i, j) (a, b', c, d, e, f, g, h, i, j) b b' #
Field2 (a, b, c, d, e, f, g, h, i, j, kk) (a, b', c, d, e, f, g, h, i, j, kk) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f, g, h, i, j, kk) (a, b', c, d, e, f, g, h, i, j, kk) b b' #
Field2 (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b', c, d, e, f, g, h, i, j, kk, l) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b', c, d, e, f, g, h, i, j, kk, l) b b' #
Field2 (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b', c, d, e, f, g, h, i, j, kk, l, m) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b', c, d, e, f, g, h, i, j, kk, l, m) b b' #
Field2 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b', c, d, e, f, g, h, i, j, kk, l, m, n) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b', c, d, e, f, g, h, i, j, kk, l, m, n) b b' #
Field2 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b', c, d, e, f, g, h, i, j, kk, l, m, n, o) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b', c, d, e, f, g, h, i, j, kk, l, m, n, o) b b' #
Field2 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b', c, d, e, f, g, h, i, j, kk, l, m, n, o, p) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b', c, d, e, f, g, h, i, j, kk, l, m, n, o, p) b b' #
Field2 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b', c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b', c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) b b' #
Field2 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b', c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b', c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) b b' #
Field2 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b', c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) b b'
Instance details Defined in Control.Lens.Tuple Methods _2 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b', c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) b b' #

class Field3 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 3rd field of a tuple.

Minimal complete definition

Nothing

Methods

_3 :: Lens s t a b #

Access the 3rd field of a tuple.

Instances

Instances details

Field3 (Plucker a) (Plucker a) a a
Instance details Defined in Linear.Plucker Methods _3 :: Lens (Plucker a) (Plucker a) a a #
Field3 (Quaternion a) (Quaternion a) a a
Instance details Defined in Linear.Quaternion Methods _3 :: Lens (Quaternion a) (Quaternion a) a a #
Field3 (V3 a) (V3 a) a a
Instance details Defined in Linear.V3 Methods _3 :: Lens (V3 a) (V3 a) a a #
Field3 (V4 a) (V4 a) a a
Instance details Defined in Linear.V4 Methods _3 :: Lens (V4 a) (V4 a) a a #
3 <= n => Field3 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _3 :: Lens (V n a) (V n a) a a #
Field3 (a, b, c) (a, b, c') c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c) (a, b, c') c c' #
Field3 (a, b, c, d) (a, b, c', d) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d) (a, b, c', d) c c' #
Field3 (a, b, c, d, e) (a, b, c', d, e) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e) (a, b, c', d, e) c c' #
Field3 (a, b, c, d, e, f) (a, b, c', d, e, f) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f) (a, b, c', d, e, f) c c' #
Field3 (a, b, c, d, e, f, g) (a, b, c', d, e, f, g) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f, g) (a, b, c', d, e, f, g) c c' #
Field3 (a, b, c, d, e, f, g, h) (a, b, c', d, e, f, g, h) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f, g, h) (a, b, c', d, e, f, g, h) c c' #
Field3 (a, b, c, d, e, f, g, h, i) (a, b, c', d, e, f, g, h, i) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c', d, e, f, g, h, i) c c' #
Field3 (a, b, c, d, e, f, g, h, i, j) (a, b, c', d, e, f, g, h, i, j) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f, g, h, i, j) (a, b, c', d, e, f, g, h, i, j) c c' #
Field3 (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c', d, e, f, g, h, i, j, kk) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c', d, e, f, g, h, i, j, kk) c c' #
Field3 (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c', d, e, f, g, h, i, j, kk, l) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c', d, e, f, g, h, i, j, kk, l) c c' #
Field3 (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c', d, e, f, g, h, i, j, kk, l, m) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c', d, e, f, g, h, i, j, kk, l, m) c c' #
Field3 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c', d, e, f, g, h, i, j, kk, l, m, n) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c', d, e, f, g, h, i, j, kk, l, m, n) c c' #
Field3 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c', d, e, f, g, h, i, j, kk, l, m, n, o) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c', d, e, f, g, h, i, j, kk, l, m, n, o) c c' #
Field3 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c', d, e, f, g, h, i, j, kk, l, m, n, o, p) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c', d, e, f, g, h, i, j, kk, l, m, n, o, p) c c' #
Field3 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c', d, e, f, g, h, i, j, kk, l, m, n, o, p, q) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c', d, e, f, g, h, i, j, kk, l, m, n, o, p, q) c c' #
Field3 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c', d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c', d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) c c' #
Field3 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c', d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) c c'
Instance details Defined in Control.Lens.Tuple Methods _3 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c', d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) c c' #

class Field4 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provide access to the 4th field of a tuple.

Minimal complete definition

Nothing

Methods

_4 :: Lens s t a b #

Access the 4th field of a tuple.

Instances

Instances details

Field4 (Plucker a) (Plucker a) a a
Instance details Defined in Linear.Plucker Methods _4 :: Lens (Plucker a) (Plucker a) a a #
Field4 (Quaternion a) (Quaternion a) a a
Instance details Defined in Linear.Quaternion Methods _4 :: Lens (Quaternion a) (Quaternion a) a a #
Field4 (V4 a) (V4 a) a a
Instance details Defined in Linear.V4 Methods _4 :: Lens (V4 a) (V4 a) a a #
4 <= n => Field4 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _4 :: Lens (V n a) (V n a) a a #
Field4 (a, b, c, d) (a, b, c, d') d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d) (a, b, c, d') d d' #
Field4 (a, b, c, d, e) (a, b, c, d', e) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e) (a, b, c, d', e) d d' #
Field4 (a, b, c, d, e, f) (a, b, c, d', e, f) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f) (a, b, c, d', e, f) d d' #
Field4 (a, b, c, d, e, f, g) (a, b, c, d', e, f, g) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f, g) (a, b, c, d', e, f, g) d d' #
Field4 (a, b, c, d, e, f, g, h) (a, b, c, d', e, f, g, h) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f, g, h) (a, b, c, d', e, f, g, h) d d' #
Field4 (a, b, c, d, e, f, g, h, i) (a, b, c, d', e, f, g, h, i) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c, d', e, f, g, h, i) d d' #
Field4 (a, b, c, d, e, f, g, h, i, j) (a, b, c, d', e, f, g, h, i, j) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f, g, h, i, j) (a, b, c, d', e, f, g, h, i, j) d d' #
Field4 (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d', e, f, g, h, i, j, kk) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d', e, f, g, h, i, j, kk) d d' #
Field4 (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d', e, f, g, h, i, j, kk, l) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d', e, f, g, h, i, j, kk, l) d d' #
Field4 (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d', e, f, g, h, i, j, kk, l, m) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d', e, f, g, h, i, j, kk, l, m) d d' #
Field4 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d', e, f, g, h, i, j, kk, l, m, n) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d', e, f, g, h, i, j, kk, l, m, n) d d' #
Field4 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d', e, f, g, h, i, j, kk, l, m, n, o) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d', e, f, g, h, i, j, kk, l, m, n, o) d d' #
Field4 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d', e, f, g, h, i, j, kk, l, m, n, o, p) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d', e, f, g, h, i, j, kk, l, m, n, o, p) d d' #
Field4 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d', e, f, g, h, i, j, kk, l, m, n, o, p, q) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d', e, f, g, h, i, j, kk, l, m, n, o, p, q) d d' #
Field4 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d', e, f, g, h, i, j, kk, l, m, n, o, p, q, r) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d', e, f, g, h, i, j, kk, l, m, n, o, p, q, r) d d' #
Field4 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d', e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) d d'
Instance details Defined in Control.Lens.Tuple Methods _4 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d', e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) d d' #

class Field5 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 5th field of a tuple.

Minimal complete definition

Nothing

Methods

_5 :: Lens s t a b #

Access the 5th field of a tuple.

Instances

Instances details

Field5 (Plucker a) (Plucker a) a a
Instance details Defined in Linear.Plucker Methods _5 :: Lens (Plucker a) (Plucker a) a a #
5 <= n => Field5 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _5 :: Lens (V n a) (V n a) a a #
Field5 (a, b, c, d, e) (a, b, c, d, e') e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e) (a, b, c, d, e') e e' #
Field5 (a, b, c, d, e, f) (a, b, c, d, e', f) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f) (a, b, c, d, e', f) e e' #
Field5 (a, b, c, d, e, f, g) (a, b, c, d, e', f, g) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f, g) (a, b, c, d, e', f, g) e e' #
Field5 (a, b, c, d, e, f, g, h) (a, b, c, d, e', f, g, h) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f, g, h) (a, b, c, d, e', f, g, h) e e' #
Field5 (a, b, c, d, e, f, g, h, i) (a, b, c, d, e', f, g, h, i) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c, d, e', f, g, h, i) e e' #
Field5 (a, b, c, d, e, f, g, h, i, j) (a, b, c, d, e', f, g, h, i, j) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f, g, h, i, j) (a, b, c, d, e', f, g, h, i, j) e e' #
Field5 (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e', f, g, h, i, j, kk) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e', f, g, h, i, j, kk) e e' #
Field5 (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e', f, g, h, i, j, kk, l) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e', f, g, h, i, j, kk, l) e e' #
Field5 (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e', f, g, h, i, j, kk, l, m) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e', f, g, h, i, j, kk, l, m) e e' #
Field5 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e', f, g, h, i, j, kk, l, m, n) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e', f, g, h, i, j, kk, l, m, n) e e' #
Field5 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e', f, g, h, i, j, kk, l, m, n, o) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e', f, g, h, i, j, kk, l, m, n, o) e e' #
Field5 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e', f, g, h, i, j, kk, l, m, n, o, p) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e', f, g, h, i, j, kk, l, m, n, o, p) e e' #
Field5 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e', f, g, h, i, j, kk, l, m, n, o, p, q) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e', f, g, h, i, j, kk, l, m, n, o, p, q) e e' #
Field5 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e', f, g, h, i, j, kk, l, m, n, o, p, q, r) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e', f, g, h, i, j, kk, l, m, n, o, p, q, r) e e' #
Field5 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e', f, g, h, i, j, kk, l, m, n, o, p, q, r, s) e e'
Instance details Defined in Control.Lens.Tuple Methods _5 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e', f, g, h, i, j, kk, l, m, n, o, p, q, r, s) e e' #

class Field6 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 6th element of a tuple.

Minimal complete definition

Nothing

Methods

_6 :: Lens s t a b #

Access the 6th field of a tuple.

Instances

Instances details

Field6 (Plucker a) (Plucker a) a a
Instance details Defined in Linear.Plucker Methods _6 :: Lens (Plucker a) (Plucker a) a a #
6 <= n => Field6 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _6 :: Lens (V n a) (V n a) a a #
Field6 (a, b, c, d, e, f) (a, b, c, d, e, f') f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f) (a, b, c, d, e, f') f f' #
Field6 (a, b, c, d, e, f, g) (a, b, c, d, e, f', g) f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f, g) (a, b, c, d, e, f', g) f f' #
Field6 (a, b, c, d, e, f, g, h) (a, b, c, d, e, f', g, h) f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f, g, h) (a, b, c, d, e, f', g, h) f f' #
Field6 (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f', g, h, i) f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f', g, h, i) f f' #
Field6 (a, b, c, d, e, f, g, h, i, j) (a, b, c, d, e, f', g, h, i, j) f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f, g, h, i, j) (a, b, c, d, e, f', g, h, i, j) f f' #
Field6 (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e, f', g, h, i, j, kk) f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e, f', g, h, i, j, kk) f f' #
Field6 (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f', g, h, i, j, kk, l) f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f', g, h, i, j, kk, l) f f' #
Field6 (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f', g, h, i, j, kk, l, m) f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f', g, h, i, j, kk, l, m) f f' #
Field6 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f', g, h, i, j, kk, l, m, n) f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f', g, h, i, j, kk, l, m, n) f f' #
Field6 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f', g, h, i, j, kk, l, m, n, o) f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f', g, h, i, j, kk, l, m, n, o) f f' #
Field6 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f', g, h, i, j, kk, l, m, n, o, p) f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f', g, h, i, j, kk, l, m, n, o, p) f f' #
Field6 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f', g, h, i, j, kk, l, m, n, o, p, q) f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f', g, h, i, j, kk, l, m, n, o, p, q) f f' #
Field6 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f', g, h, i, j, kk, l, m, n, o, p, q, r) f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f', g, h, i, j, kk, l, m, n, o, p, q, r) f f' #
Field6 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f', g, h, i, j, kk, l, m, n, o, p, q, r, s) f f'
Instance details Defined in Control.Lens.Tuple Methods _6 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f', g, h, i, j, kk, l, m, n, o, p, q, r, s) f f' #

class Field7 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provide access to the 7th field of a tuple.

Minimal complete definition

Nothing

Methods

_7 :: Lens s t a b #

Access the 7th field of a tuple.

Instances

Instances details

7 <= n => Field7 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _7 :: Lens (V n a) (V n a) a a #
Field7 (a, b, c, d, e, f, g) (a, b, c, d, e, f, g') g g'
Instance details Defined in Control.Lens.Tuple Methods _7 :: Lens (a, b, c, d, e, f, g) (a, b, c, d, e, f, g') g g' #
Field7 (a, b, c, d, e, f, g, h) (a, b, c, d, e, f, g', h) g g'
Instance details Defined in Control.Lens.Tuple Methods _7 :: Lens (a, b, c, d, e, f, g, h) (a, b, c, d, e, f, g', h) g g' #
Field7 (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f, g', h, i) g g'
Instance details Defined in Control.Lens.Tuple Methods _7 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f, g', h, i) g g' #
Field7 (a, b, c, d, e, f, g, h, i, j) (a, b, c, d, e, f, g', h, i, j) g g'
Instance details Defined in Control.Lens.Tuple Methods _7 :: Lens (a, b, c, d, e, f, g, h, i, j) (a, b, c, d, e, f, g', h, i, j) g g' #
Field7 (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e, f, g', h, i, j, kk) g g'
Instance details Defined in Control.Lens.Tuple Methods _7 :: Lens (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e, f, g', h, i, j, kk) g g' #
Field7 (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f, g', h, i, j, kk, l) g g'
Instance details Defined in Control.Lens.Tuple Methods _7 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f, g', h, i, j, kk, l) g g' #
Field7 (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g', h, i, j, kk, l, m) g g'
Instance details Defined in Control.Lens.Tuple Methods _7 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g', h, i, j, kk, l, m) g g' #
Field7 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g', h, i, j, kk, l, m, n) g g'
Instance details Defined in Control.Lens.Tuple Methods _7 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g', h, i, j, kk, l, m, n) g g' #
Field7 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g', h, i, j, kk, l, m, n, o) g g'
Instance details Defined in Control.Lens.Tuple Methods _7 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g', h, i, j, kk, l, m, n, o) g g' #
Field7 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g', h, i, j, kk, l, m, n, o, p) g g'
Instance details Defined in Control.Lens.Tuple Methods _7 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g', h, i, j, kk, l, m, n, o, p) g g' #
Field7 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g', h, i, j, kk, l, m, n, o, p, q) g g'
Instance details Defined in Control.Lens.Tuple Methods _7 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g', h, i, j, kk, l, m, n, o, p, q) g g' #
Field7 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g', h, i, j, kk, l, m, n, o, p, q, r) g g'
Instance details Defined in Control.Lens.Tuple Methods _7 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g', h, i, j, kk, l, m, n, o, p, q, r) g g' #
Field7 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g', h, i, j, kk, l, m, n, o, p, q, r, s) g g'
Instance details Defined in Control.Lens.Tuple Methods _7 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g', h, i, j, kk, l, m, n, o, p, q, r, s) g g' #

class Field8 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provide access to the 8th field of a tuple.

Minimal complete definition

Nothing

Methods

_8 :: Lens s t a b #

Access the 8th field of a tuple.

Instances

Instances details

8 <= n => Field8 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _8 :: Lens (V n a) (V n a) a a #
Field8 (a, b, c, d, e, f, g, h) (a, b, c, d, e, f, g, h') h h'
Instance details Defined in Control.Lens.Tuple Methods _8 :: Lens (a, b, c, d, e, f, g, h) (a, b, c, d, e, f, g, h') h h' #
Field8 (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f, g, h', i) h h'
Instance details Defined in Control.Lens.Tuple Methods _8 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f, g, h', i) h h' #
Field8 (a, b, c, d, e, f, g, h, i, j) (a, b, c, d, e, f, g, h', i, j) h h'
Instance details Defined in Control.Lens.Tuple Methods _8 :: Lens (a, b, c, d, e, f, g, h, i, j) (a, b, c, d, e, f, g, h', i, j) h h' #
Field8 (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e, f, g, h', i, j, kk) h h'
Instance details Defined in Control.Lens.Tuple Methods _8 :: Lens (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e, f, g, h', i, j, kk) h h' #
Field8 (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f, g, h', i, j, kk, l) h h'
Instance details Defined in Control.Lens.Tuple Methods _8 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f, g, h', i, j, kk, l) h h' #
Field8 (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g, h', i, j, kk, l, m) h h'
Instance details Defined in Control.Lens.Tuple Methods _8 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g, h', i, j, kk, l, m) h h' #
Field8 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h', i, j, kk, l, m, n) h h'
Instance details Defined in Control.Lens.Tuple Methods _8 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h', i, j, kk, l, m, n) h h' #
Field8 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h', i, j, kk, l, m, n, o) h h'
Instance details Defined in Control.Lens.Tuple Methods _8 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h', i, j, kk, l, m, n, o) h h' #
Field8 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h', i, j, kk, l, m, n, o, p) h h'
Instance details Defined in Control.Lens.Tuple Methods _8 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h', i, j, kk, l, m, n, o, p) h h' #
Field8 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h', i, j, kk, l, m, n, o, p, q) h h'
Instance details Defined in Control.Lens.Tuple Methods _8 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h', i, j, kk, l, m, n, o, p, q) h h' #
Field8 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h', i, j, kk, l, m, n, o, p, q, r) h h'
Instance details Defined in Control.Lens.Tuple Methods _8 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h', i, j, kk, l, m, n, o, p, q, r) h h' #
Field8 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h', i, j, kk, l, m, n, o, p, q, r, s) h h'
Instance details Defined in Control.Lens.Tuple Methods _8 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h', i, j, kk, l, m, n, o, p, q, r, s) h h' #

class Field9 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 9th field of a tuple.

Minimal complete definition

Nothing

Methods

_9 :: Lens s t a b #

Access the 9th field of a tuple.

Instances

Instances details

9 <= n => Field9 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _9 :: Lens (V n a) (V n a) a a #
Field9 (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f, g, h, i') i i'
Instance details Defined in Control.Lens.Tuple Methods _9 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f, g, h, i') i i' #
Field9 (a, b, c, d, e, f, g, h, i, j) (a, b, c, d, e, f, g, h, i', j) i i'
Instance details Defined in Control.Lens.Tuple Methods _9 :: Lens (a, b, c, d, e, f, g, h, i, j) (a, b, c, d, e, f, g, h, i', j) i i' #
Field9 (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e, f, g, h, i', j, kk) i i'
Instance details Defined in Control.Lens.Tuple Methods _9 :: Lens (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e, f, g, h, i', j, kk) i i' #
Field9 (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f, g, h, i', j, kk, l) i i'
Instance details Defined in Control.Lens.Tuple Methods _9 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f, g, h, i', j, kk, l) i i' #
Field9 (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g, h, i', j, kk, l, m) i i'
Instance details Defined in Control.Lens.Tuple Methods _9 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g, h, i', j, kk, l, m) i i' #
Field9 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h, i', j, kk, l, m, n) i i'
Instance details Defined in Control.Lens.Tuple Methods _9 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h, i', j, kk, l, m, n) i i' #
Field9 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i', j, kk, l, m, n, o) i i'
Instance details Defined in Control.Lens.Tuple Methods _9 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i', j, kk, l, m, n, o) i i' #
Field9 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i', j, kk, l, m, n, o, p) i i'
Instance details Defined in Control.Lens.Tuple Methods _9 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i', j, kk, l, m, n, o, p) i i' #
Field9 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i', j, kk, l, m, n, o, p, q) i i'
Instance details Defined in Control.Lens.Tuple Methods _9 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i', j, kk, l, m, n, o, p, q) i i' #
Field9 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i', j, kk, l, m, n, o, p, q, r) i i'
Instance details Defined in Control.Lens.Tuple Methods _9 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i', j, kk, l, m, n, o, p, q, r) i i' #
Field9 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i', j, kk, l, m, n, o, p, q, r, s) i i'
Instance details Defined in Control.Lens.Tuple Methods _9 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i', j, kk, l, m, n, o, p, q, r, s) i i' #

class Field10 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 10th field of a tuple.

Minimal complete definition

Nothing

Methods

_10 :: Lens s t a b #

Access the 10th field of a tuple.

Instances

Instances details

10 <= n => Field10 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _10 :: Lens (V n a) (V n a) a a #
Field10 (a, b, c, d, e, f, g, h, i, j) (a, b, c, d, e, f, g, h, i, j') j j'
Instance details Defined in Control.Lens.Tuple Methods _10 :: Lens (a, b, c, d, e, f, g, h, i, j) (a, b, c, d, e, f, g, h, i, j') j j' #
Field10 (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e, f, g, h, i, j', kk) j j'
Instance details Defined in Control.Lens.Tuple Methods _10 :: Lens (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e, f, g, h, i, j', kk) j j' #
Field10 (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f, g, h, i, j', kk, l) j j'
Instance details Defined in Control.Lens.Tuple Methods _10 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f, g, h, i, j', kk, l) j j' #
Field10 (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g, h, i, j', kk, l, m) j j'
Instance details Defined in Control.Lens.Tuple Methods _10 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g, h, i, j', kk, l, m) j j' #
Field10 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h, i, j', kk, l, m, n) j j'
Instance details Defined in Control.Lens.Tuple Methods _10 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h, i, j', kk, l, m, n) j j' #
Field10 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i, j', kk, l, m, n, o) j j'
Instance details Defined in Control.Lens.Tuple Methods _10 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i, j', kk, l, m, n, o) j j' #
Field10 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j', kk, l, m, n, o, p) j j'
Instance details Defined in Control.Lens.Tuple Methods _10 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j', kk, l, m, n, o, p) j j' #
Field10 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j', kk, l, m, n, o, p, q) j j'
Instance details Defined in Control.Lens.Tuple Methods _10 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j', kk, l, m, n, o, p, q) j j' #
Field10 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j', kk, l, m, n, o, p, q, r) j j'
Instance details Defined in Control.Lens.Tuple Methods _10 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j', kk, l, m, n, o, p, q, r) j j' #
Field10 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j', kk, l, m, n, o, p, q, r, s) j j'
Instance details Defined in Control.Lens.Tuple Methods _10 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j', kk, l, m, n, o, p, q, r, s) j j' #

class Field11 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 11th field of a tuple.

Minimal complete definition

Nothing

Methods

_11 :: Lens s t a b #

Access the 11th field of a tuple.

Instances

Instances details

11 <= n => Field11 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _11 :: Lens (V n a) (V n a) a a #
Field11 (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e, f, g, h, i, j, kk') kk kk'
Instance details Defined in Control.Lens.Tuple Methods _11 :: Lens (a, b, c, d, e, f, g, h, i, j, kk) (a, b, c, d, e, f, g, h, i, j, kk') kk kk' #
Field11 (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f, g, h, i, j, kk', l) kk kk'
Instance details Defined in Control.Lens.Tuple Methods _11 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f, g, h, i, j, kk', l) kk kk' #
Field11 (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g, h, i, j, kk', l, m) kk kk'
Instance details Defined in Control.Lens.Tuple Methods _11 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g, h, i, j, kk', l, m) kk kk' #
Field11 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h, i, j, kk', l, m, n) kk kk'
Instance details Defined in Control.Lens.Tuple Methods _11 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h, i, j, kk', l, m, n) kk kk' #
Field11 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i, j, kk', l, m, n, o) kk kk'
Instance details Defined in Control.Lens.Tuple Methods _11 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i, j, kk', l, m, n, o) kk kk' #
Field11 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j, kk', l, m, n, o, p) kk kk'
Instance details Defined in Control.Lens.Tuple Methods _11 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j, kk', l, m, n, o, p) kk kk' #
Field11 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk', l, m, n, o, p, q) kk kk'
Instance details Defined in Control.Lens.Tuple Methods _11 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk', l, m, n, o, p, q) kk kk' #
Field11 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk', l, m, n, o, p, q, r) kk kk'
Instance details Defined in Control.Lens.Tuple Methods _11 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk', l, m, n, o, p, q, r) kk kk' #
Field11 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk', l, m, n, o, p, q, r, s) kk kk'
Instance details Defined in Control.Lens.Tuple Methods _11 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk', l, m, n, o, p, q, r, s) kk kk' #

class Field12 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 12th field of a tuple.

Minimal complete definition

Nothing

Methods

_12 :: Lens s t a b #

Access the 12th field of a tuple.

Instances

Instances details

12 <= n => Field12 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _12 :: Lens (V n a) (V n a) a a #
Field12 (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f, g, h, i, j, kk, l') l l'
Instance details Defined in Control.Lens.Tuple Methods _12 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l) (a, b, c, d, e, f, g, h, i, j, kk, l') l l' #
Field12 (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g, h, i, j, kk, l', m) l l'
Instance details Defined in Control.Lens.Tuple Methods _12 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g, h, i, j, kk, l', m) l l' #
Field12 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h, i, j, kk, l', m, n) l l'
Instance details Defined in Control.Lens.Tuple Methods _12 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h, i, j, kk, l', m, n) l l' #
Field12 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i, j, kk, l', m, n, o) l l'
Instance details Defined in Control.Lens.Tuple Methods _12 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i, j, kk, l', m, n, o) l l' #
Field12 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j, kk, l', m, n, o, p) l l'
Instance details Defined in Control.Lens.Tuple Methods _12 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j, kk, l', m, n, o, p) l l' #
Field12 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk, l', m, n, o, p, q) l l'
Instance details Defined in Control.Lens.Tuple Methods _12 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk, l', m, n, o, p, q) l l' #
Field12 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l', m, n, o, p, q, r) l l'
Instance details Defined in Control.Lens.Tuple Methods _12 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l', m, n, o, p, q, r) l l' #
Field12 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l', m, n, o, p, q, r, s) l l'
Instance details Defined in Control.Lens.Tuple Methods _12 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l', m, n, o, p, q, r, s) l l' #

class Field13 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 13th field of a tuple.

Minimal complete definition

Nothing

Methods

_13 :: Lens s t a b #

Access the 13th field of a tuple.

Instances

Instances details

13 <= n => Field13 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _13 :: Lens (V n a) (V n a) a a #
Field13 (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g, h, i, j, kk, l, m') m m'
Instance details Defined in Control.Lens.Tuple Methods _13 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m) (a, b, c, d, e, f, g, h, i, j, kk, l, m') m m' #
Field13 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h, i, j, kk, l, m', n) m m'
Instance details Defined in Control.Lens.Tuple Methods _13 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h, i, j, kk, l, m', n) m m' #
Field13 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i, j, kk, l, m', n, o) m m'
Instance details Defined in Control.Lens.Tuple Methods _13 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i, j, kk, l, m', n, o) m m' #
Field13 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j, kk, l, m', n, o, p) m m'
Instance details Defined in Control.Lens.Tuple Methods _13 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j, kk, l, m', n, o, p) m m' #
Field13 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk, l, m', n, o, p, q) m m'
Instance details Defined in Control.Lens.Tuple Methods _13 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk, l, m', n, o, p, q) m m' #
Field13 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l, m', n, o, p, q, r) m m'
Instance details Defined in Control.Lens.Tuple Methods _13 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l, m', n, o, p, q, r) m m' #
Field13 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m', n, o, p, q, r, s) m m'
Instance details Defined in Control.Lens.Tuple Methods _13 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m', n, o, p, q, r, s) m m' #

class Field14 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 14th field of a tuple.

Minimal complete definition

Nothing

Methods

_14 :: Lens s t a b #

Access the 14th field of a tuple.

Instances

Instances details

14 <= n => Field14 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _14 :: Lens (V n a) (V n a) a a #
Field14 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n') n n'
Instance details Defined in Control.Lens.Tuple Methods _14 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n') n n' #
Field14 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n', o) n n'
Instance details Defined in Control.Lens.Tuple Methods _14 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n', o) n n' #
Field14 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n', o, p) n n'
Instance details Defined in Control.Lens.Tuple Methods _14 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n', o, p) n n' #
Field14 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n', o, p, q) n n'
Instance details Defined in Control.Lens.Tuple Methods _14 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n', o, p, q) n n' #
Field14 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n', o, p, q, r) n n'
Instance details Defined in Control.Lens.Tuple Methods _14 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n', o, p, q, r) n n' #
Field14 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n', o, p, q, r, s) n n'
Instance details Defined in Control.Lens.Tuple Methods _14 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n', o, p, q, r, s) n n' #

class Field15 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 15th field of a tuple.

Minimal complete definition

Nothing

Methods

_15 :: Lens s t a b #

Access the 15th field of a tuple.

Instances

Instances details

15 <= n => Field15 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _15 :: Lens (V n a) (V n a) a a #
Field15 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o') o o'
Instance details Defined in Control.Lens.Tuple Methods _15 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o') o o' #
Field15 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o', p) o o'
Instance details Defined in Control.Lens.Tuple Methods _15 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o', p) o o' #
Field15 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o', p, q) o o'
Instance details Defined in Control.Lens.Tuple Methods _15 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o', p, q) o o' #
Field15 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o', p, q, r) o o'
Instance details Defined in Control.Lens.Tuple Methods _15 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o', p, q, r) o o' #
Field15 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o', p, q, r, s) o o'
Instance details Defined in Control.Lens.Tuple Methods _15 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o', p, q, r, s) o o' #

class Field16 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 16th field of a tuple.

Minimal complete definition

Nothing

Methods

_16 :: Lens s t a b #

Access the 16th field of a tuple.

Instances

Instances details

16 <= n => Field16 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _16 :: Lens (V n a) (V n a) a a #
Field16 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p') p p'
Instance details Defined in Control.Lens.Tuple Methods _16 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p') p p' #
Field16 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p', q) p p'
Instance details Defined in Control.Lens.Tuple Methods _16 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p', q) p p' #
Field16 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p', q, r) p p'
Instance details Defined in Control.Lens.Tuple Methods _16 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p', q, r) p p' #
Field16 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p', q, r, s) p p'
Instance details Defined in Control.Lens.Tuple Methods _16 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p', q, r, s) p p' #

class Field17 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 17th field of a tuple.

Minimal complete definition

Nothing

Methods

_17 :: Lens s t a b #

Access the 17th field of a tuple.

Instances

Instances details

17 <= n => Field17 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _17 :: Lens (V n a) (V n a) a a #
Field17 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q') q q'
Instance details Defined in Control.Lens.Tuple Methods _17 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q') q q' #
Field17 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q', r) q q'
Instance details Defined in Control.Lens.Tuple Methods _17 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q', r) q q' #
Field17 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q', r, s) q q'
Instance details Defined in Control.Lens.Tuple Methods _17 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q', r, s) q q' #

class Field18 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 18th field of a tuple.

Minimal complete definition

Nothing

Methods

_18 :: Lens s t a b #

Access the 18th field of a tuple.

Instances

Instances details

18 <= n => Field18 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _18 :: Lens (V n a) (V n a) a a #
Field18 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r') r r'
Instance details Defined in Control.Lens.Tuple Methods _18 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r') r r' #
Field18 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r', s) r r'
Instance details Defined in Control.Lens.Tuple Methods _18 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r', s) r r' #

class Field19 s t a b | s -> a, t -> b, s b -> t, t a -> s where #

Provides access to the 19th field of a tuple.

Minimal complete definition

Nothing

Methods

_19 :: Lens s t a b #

Access the 19th field of a tuple.

Instances

Instances details

19 <= n => Field19 (V n a) (V n a) a a
Instance details Defined in Linear.V Methods _19 :: Lens (V n a) (V n a) a a #
Field19 (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s') s s'
Instance details Defined in Control.Lens.Tuple Methods _19 :: Lens (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s) (a, b, c, d, e, f, g, h, i, j, kk, l, m, n, o, p, q, r, s') s s' #

fusing :: Functor f => LensLike (Yoneda f) s t a b -> LensLike f s t a b #

Fuse a composition of lenses using Yoneda to provide fmap fusion.

In general, given a pair of lenses foo and bar

fusing (foo.bar) = foo.bar

however, foo and bar are either going to fmap internally or they are trivial.

fusing exploits the Yoneda lemma to merge these separate uses into a single fmap.

This is particularly effective when the choice of functor f is unknown at compile time or when the Lens foo.bar in the above description is recursive or complex enough to prevent inlining.

fusing :: Lens s t a b -> Lens s t a b

last1 :: forall (t :: TYPE LiftedRep -> Type) a. Traversable1 t => Lens' (t a) a #

A Lens focusing on the last element of a Traversable1 container.

>>> 2 :| [3, 4] & last1 +~ 10
2 :| [3,14]

>>> Node 'a' [Node 'b' [], Node 'c' []] ^. last1
'c'

head1 :: forall (t :: TYPE LiftedRep -> Type) a. Traversable1 t => Lens' (t a) a #

A Lens focusing on the first element of a Traversable1 container.

>>> 2 :| [3, 4] & head1 +~ 10
12 :| [3,4]

>>> Identity True ^. head1
True

united :: Lens' a () #

We can always retrieve a () from any type.

>>> "hello"^.united
()

>>> "hello" & united .~ ()
"hello"

devoid :: forall {k} p f (a :: k) b. Over p f Void Void a b #

There is a field for every type in the Void. Very zen.

>>> [] & mapped.devoid +~ 1
[]

>>> Nothing & mapped.devoid %~ abs
Nothing

devoid :: Lens' Void a

(<#=) :: MonadState s m => ALens s s a b -> b -> m b infix 4 #

A version of (<.=) that works on ALens.

(<#~) :: ALens s t a b -> b -> s -> (b, t) infixr 4 #

A version of (<.~) that works on ALens.

>>> ("hello","there") & _2 <#~ "world"
("world",("hello","world"))

(#%%=) :: MonadState s m => ALens s s a b -> (a -> (r, b)) -> m r infix 4 #

A version of (%%=) that works on ALens.

(<#%=) :: MonadState s m => ALens s s a b -> (a -> b) -> m b infix 4 #

A version of (<%=) that works on ALens.

(<#%~) :: ALens s t a b -> (a -> b) -> s -> (b, t) infixr 4 #

A version of (<%~) that works on ALens.

>>> ("hello","world") & _2 <#%~ length
(5,("hello",5))

(#%=) :: MonadState s m => ALens s s a b -> (a -> b) -> m () infix 4 #

A version of (%=) that works on ALens.

(#=) :: MonadState s m => ALens s s a b -> b -> m () infix 4 #

A version of (.=) that works on ALens.

(#%%~) :: Functor f => ALens s t a b -> (a -> f b) -> s -> f t infixr 4 #

A version of (%%~) that works on ALens.

>>> ("hello","world") & _2 #%%~ \x -> (length x, x ++ "!")
(5,("hello","world!"))

(#%~) :: ALens s t a b -> (a -> b) -> s -> t infixr 4 #

A version of (%~) that works on ALens.

>>> ("hello","world") & _2 #%~ length
("hello",5)

(#~) :: ALens s t a b -> b -> s -> t infixr 4 #

A version of (.~) that works on ALens.

>>> ("hello","there") & _2 #~ "world"
("hello","world")

storing :: ALens s t a b -> b -> s -> t #

A version of set that works on ALens.

>>> storing _2 "world" ("hello","there")
("hello","world")

(^#) :: s -> ALens s t a b -> a infixl 8 #

A version of (^.) that works on ALens.

>>> ("hello","world")^#_2
"world"

(<<%@=) :: MonadState s m => Over (Indexed i) ((,) a) s s a b -> (i -> a -> b) -> m a infix 4 #

Adjust the target of an IndexedLens returning the old value, or adjust all of the targets of an IndexedTraversal within the current state, and return a monoidal summary of the old values.

(<<%@=) :: MonadState s m                 => IndexedLens i s s a b      -> (i -> a -> b) -> m a
(<<%@=) :: (MonadState s m, Monoid b) => IndexedTraversal i s s a b -> (i -> a -> b) -> m a

(<%@=) :: MonadState s m => Over (Indexed i) ((,) b) s s a b -> (i -> a -> b) -> m b infix 4 #

Adjust the target of an IndexedLens returning the intermediate result, or adjust all of the targets of an IndexedTraversal within the current state, and return a monoidal summary of the intermediate results.

(<%@=) :: MonadState s m                 => IndexedLens i s s a b      -> (i -> a -> b) -> m b
(<%@=) :: (MonadState s m, Monoid b) => IndexedTraversal i s s a b -> (i -> a -> b) -> m b

(%%@=) :: MonadState s m => Over (Indexed i) ((,) r) s s a b -> (i -> a -> (r, b)) -> m r infix 4 #

Adjust the target of an IndexedLens returning a supplementary result, or adjust all of the targets of an IndexedTraversal within the current state, and return a monoidal summary of the supplementary results.

l %%@= f ≡ state (l %%@~ f)

(%%@=) :: MonadState s m                 => IndexedLens i s s a b      -> (i -> a -> (r, b)) -> s -> m r
(%%@=) :: (MonadState s m, Monoid r) => IndexedTraversal i s s a b -> (i -> a -> (r, b)) -> s -> m r

(%%@~) :: forall {k1} i f s (t :: k1) a (b :: k1). Over (Indexed i) f s t a b -> (i -> a -> f b) -> s -> f t infixr 4 #

Adjust the target of an IndexedLens returning a supplementary result, or adjust all of the targets of an IndexedTraversal and return a monoidal summary of the supplementary results and the answer.

(%%@~) ≡ withIndex

(%%@~) :: Functor f => IndexedLens i s t a b      -> (i -> a -> f b) -> s -> f t
(%%@~) :: Applicative f => IndexedTraversal i s t a b -> (i -> a -> f b) -> s -> f t

In particular, it is often useful to think of this function as having one of these even more restricted type signatures:

(%%@~) ::             IndexedLens i s t a b      -> (i -> a -> (r, b)) -> s -> (r, t)
(%%@~) :: Monoid r => IndexedTraversal i s t a b -> (i -> a -> (r, b)) -> s -> (r, t)

(<<%@~) :: Over (Indexed i) ((,) a) s t a b -> (i -> a -> b) -> s -> (a, t) infixr 4 #

Adjust the target of an IndexedLens returning the old value, or adjust all of the targets of an IndexedTraversal and return a monoidal summary of the old values along with the answer.

(<<%@~) ::             IndexedLens i s t a b      -> (i -> a -> b) -> s -> (a, t)
(<<%@~) :: Monoid a => IndexedTraversal i s t a b -> (i -> a -> b) -> s -> (a, t)

(<%@~) :: Over (Indexed i) ((,) b) s t a b -> (i -> a -> b) -> s -> (b, t) infixr 4 #

Adjust the target of an IndexedLens returning the intermediate result, or adjust all of the targets of an IndexedTraversal and return a monoidal summary along with the answer.

l <%~ f ≡ l <%@~ const f

When you do not need access to the index then (<%~) is more liberal in what it can accept.

If you do not need the intermediate result, you can use (%@~) or even (%~).

(<%@~) ::             IndexedLens i s t a b      -> (i -> a -> b) -> s -> (b, t)
(<%@~) :: Monoid b => IndexedTraversal i s t a b -> (i -> a -> b) -> s -> (b, t)

overA :: Arrow ar => LensLike (Context a b) s t a b -> ar a b -> ar s t #

over for Arrows.

Unlike over, overA can't accept a simple Setter, but requires a full lens, or close enough.

>>> overA _1 ((+1) *** (+2)) ((1,2),6)
((2,4),6)

overA :: Arrow ar => Lens s t a b -> ar a b -> ar s t

(<<>=) :: (MonadState s m, Semigroup r) => LensLike' ((,) r) s r -> r -> m r infix 4 #

(<>) a Semigroup value onto the end of the target of a Lens into your Monad's state and return the result.

When you do not need the result of the operation, (<>=) is more flexible.

(<<>~) :: Semigroup m => LensLike ((,) m) s t m m -> m -> s -> (m, t) infixr 4 #

(<>) a Semigroup value onto the end of the target of a Lens and return the result.

When you do not need the result of the operation, (<>~) is more flexible.

(<<~) :: MonadState s m => ALens s s a b -> m b -> m b infixr 2 #

Run a monadic action, and set the target of Lens to its result.

(<<~) :: MonadState s m => Iso s s a b   -> m b -> m b
(<<~) :: MonadState s m => Lens s s a b  -> m b -> m b

NB: This is limited to taking an actual Lens than admitting a Traversal because there are potential loss of state issues otherwise.

(<<<>=) :: (MonadState s m, Semigroup r) => LensLike' ((,) r) s r -> r -> m r infix 4 #

Modify the target of a Lens into your Monad's state by using (<>) and return the old value that was replaced.

When you do not need the result of the operation, (<>=) is more flexible.

(<<<>=) :: (MonadState s m, Semigroup r) => Lens' s r -> r -> m r
(<<<>=) :: (MonadState s m, Semigroup r) => Iso' s r -> r -> m r

(<<&&=) :: MonadState s m => LensLike' ((,) Bool) s Bool -> Bool -> m Bool infix 4 #

Modify the target of a Lens into your Monad's state by taking its logical && with a value and return the old value that was replaced.

When you do not need the result of the operation, (&&=) is more flexible.

(<<&&=) :: MonadState s m => Lens' s Bool -> Bool -> m Bool
(<<&&=) :: MonadState s m => Iso' s Bool -> Bool -> m Bool

(<<||=) :: MonadState s m => LensLike' ((,) Bool) s Bool -> Bool -> m Bool infix 4 #

Modify the target of a Lens into your Monad's state by taking its logical || with a value and return the old value that was replaced.

When you do not need the result of the operation, (||=) is more flexible.

(<<||=) :: MonadState s m => Lens' s Bool -> Bool -> m Bool
(<<||=) :: MonadState s m => Iso' s Bool -> Bool -> m Bool

(<<**=) :: (MonadState s m, Floating a) => LensLike' ((,) a) s a -> a -> m a infix 4 #

Modify the target of a Lens into your Monad's state by raising it by an arbitrary power and return the old value that was replaced.

When you do not need the result of the operation, (**=) is more flexible.

(<<**=) :: (MonadState s m, Floating a) => Lens' s a -> a -> m a
(<<**=) :: (MonadState s m, Floating a) => Iso' s a -> a -> m a

(<<^^=) :: (MonadState s m, Fractional a, Integral e) => LensLike' ((,) a) s a -> e -> m a infix 4 #

Modify the target of a Lens into your Monad's state by raising it by an integral power and return the old value that was replaced.

When you do not need the result of the operation, (^^=) is more flexible.

(<<^^=) :: (MonadState s m, Fractional a, Integral e) => Lens' s a -> e -> m a
(<<^^=) :: (MonadState s m, Fractional a, Integral e) => Iso' s a -> e -> m a

(<<^=) :: (MonadState s m, Num a, Integral e) => LensLike' ((,) a) s a -> e -> m a infix 4 #

Modify the target of a Lens into your Monad's state by raising it by a non-negative power and return the old value that was replaced.

When you do not need the result of the operation, (^=) is more flexible.

(<<^=) :: (MonadState s m, Num a, Integral e) => Lens' s a -> e -> m a
(<<^=) :: (MonadState s m, Num a, Integral e) => Iso' s a -> a -> m a

(<<//=) :: (MonadState s m, Fractional a) => LensLike' ((,) a) s a -> a -> m a infix 4 #

Modify the target of a Lens into your Monads state by dividing by a value and return the old value that was replaced.

When you do not need the result of the operation, (//=) is more flexible.

(<<//=) :: (MonadState s m, Fractional a) => Lens' s a -> a -> m a
(<<//=) :: (MonadState s m, Fractional a) => Iso' s a -> a -> m a

(<<*=) :: (MonadState s m, Num a) => LensLike' ((,) a) s a -> a -> m a infix 4 #

Modify the target of a Lens into your Monad's state by multipling a value and return the old value that was replaced.

When you do not need the result of the operation, (*=) is more flexible.

(<<*=) :: (MonadState s m, Num a) => Lens' s a -> a -> m a
(<<*=) :: (MonadState s m, Num a) => Iso' s a -> a -> m a

(<<-=) :: (MonadState s m, Num a) => LensLike' ((,) a) s a -> a -> m a infix 4 #

Modify the target of a Lens into your Monad's state by subtracting a value and return the old value that was replaced.

When you do not need the result of the operation, (-=) is more flexible.

(<<-=) :: (MonadState s m, Num a) => Lens' s a -> a -> m a
(<<-=) :: (MonadState s m, Num a) => Iso' s a -> a -> m a

(<<+=) :: (MonadState s m, Num a) => LensLike' ((,) a) s a -> a -> m a infix 4 #

Modify the target of a Lens into your Monad's state by adding a value and return the old value that was replaced.

When you do not need the result of the operation, (+=) is more flexible.

(<<+=) :: (MonadState s m, Num a) => Lens' s a -> a -> m a
(<<+=) :: (MonadState s m, Num a) => Iso' s a -> a -> m a

(<<?=) :: MonadState s m => LensLike ((,) a) s s a (Maybe b) -> b -> m a infix 4 #

Replace the target of a Lens into your Monad's state with Just a user supplied value and return the old value that was replaced.

When applied to a Traversal, this will return a monoidal summary of all of the old values present.

When you do not need the result of the operation, (?=) is more flexible.

(<<?=) :: MonadState s m             => Lens s t a (Maybe b)      -> b -> m a
(<<?=) :: MonadState s m             => Iso s t a (Maybe b)       -> b -> m a
(<<?=) :: (MonadState s m, Monoid a) => Traversal s t a (Maybe b) -> b -> m a

(<<.=) :: MonadState s m => LensLike ((,) a) s s a b -> b -> m a infix 4 #

Replace the target of a Lens into your Monad's state with a user supplied value and return the old value that was replaced.

When applied to a Traversal, this will return a monoidal summary of all of the old values present.

When you do not need the result of the operation, (.=) is more flexible.

(<<.=) :: MonadState s m             => Lens' s a      -> a -> m a
(<<.=) :: MonadState s m             => Iso' s a       -> a -> m a
(<<.=) :: (MonadState s m, Monoid a) => Traversal' s a -> a -> m a

(<<%=) :: (Strong p, MonadState s m) => Over p ((,) a) s s a b -> p a b -> m a infix 4 #

Modify the target of a Lens into your Monad's state by a user supplied function and return the old value that was replaced.

When applied to a Traversal, this will return a monoidal summary of all of the old values present.

When you do not need the result of the operation, (%=) is more flexible.

(<<%=) :: MonadState s m             => Lens' s a      -> (a -> a) -> m a
(<<%=) :: MonadState s m             => Iso' s a       -> (a -> a) -> m a
(<<%=) :: (MonadState s m, Monoid a) => Traversal' s a -> (a -> a) -> m a

(<<%=) :: MonadState s m => LensLike ((,)a) s s a b -> (a -> b) -> m a

(<&&=) :: MonadState s m => LensLike' ((,) Bool) s Bool -> Bool -> m Bool infix 4 #

Logically && a Boolean valued Lens into your Monad's state and return the result.

When you do not need the result of the operation, (&&=) is more flexible.

(<&&=) :: MonadState s m => Lens' s Bool -> Bool -> m Bool
(<&&=) :: MonadState s m => Iso' s Bool  -> Bool -> m Bool

(<||=) :: MonadState s m => LensLike' ((,) Bool) s Bool -> Bool -> m Bool infix 4 #

Logically || a Boolean valued Lens into your Monad's state and return the result.

When you do not need the result of the operation, (||=) is more flexible.

(<||=) :: MonadState s m => Lens' s Bool -> Bool -> m Bool
(<||=) :: MonadState s m => Iso' s Bool  -> Bool -> m Bool

(<**=) :: (MonadState s m, Floating a) => LensLike' ((,) a) s a -> a -> m a infix 4 #

Raise the target of a floating-point valued Lens into your Monad's state to an arbitrary power and return the result.

When you do not need the result of the operation, (**=) is more flexible.

(<**=) :: (MonadState s m, Floating a) => Lens' s a -> a -> m a
(<**=) :: (MonadState s m, Floating a) => Iso' s a -> a -> m a

(<^^=) :: (MonadState s m, Fractional a, Integral e) => LensLike' ((,) a) s a -> e -> m a infix 4 #

Raise the target of a fractionally valued Lens into your Monad's state to an Integral power and return the result.

When you do not need the result of the operation, (^^=) is more flexible.

(<^^=) :: (MonadState s m, Fractional b, Integral e) => Lens' s a -> e -> m a
(<^^=) :: (MonadState s m, Fractional b, Integral e) => Iso' s a  -> e -> m a

(<^=) :: (MonadState s m, Num a, Integral e) => LensLike' ((,) a) s a -> e -> m a infix 4 #

Raise the target of a numerically valued Lens into your Monad's state to a non-negative Integral power and return the result.

When you do not need the result of the operation, (^=) is more flexible.

(<^=) :: (MonadState s m, Num a, Integral e) => Lens' s a -> e -> m a
(<^=) :: (MonadState s m, Num a, Integral e) => Iso' s a -> e -> m a

(<//=) :: (MonadState s m, Fractional a) => LensLike' ((,) a) s a -> a -> m a infix 4 #

Divide the target of a fractionally valued Lens into your Monad's state and return the result.

When you do not need the result of the division, (//=) is more flexible.

(<//=) :: (MonadState s m, Fractional a) => Lens' s a -> a -> m a
(<//=) :: (MonadState s m, Fractional a) => Iso' s a -> a -> m a

(<*=) :: (MonadState s m, Num a) => LensLike' ((,) a) s a -> a -> m a infix 4 #

Multiply the target of a numerically valued Lens into your Monad's state and return the result.

When you do not need the result of the multiplication, (*=) is more flexible.

(<*=) :: (MonadState s m, Num a) => Lens' s a -> a -> m a
(<*=) :: (MonadState s m, Num a) => Iso' s a -> a -> m a

(<-=) :: (MonadState s m, Num a) => LensLike' ((,) a) s a -> a -> m a infix 4 #

Subtract from the target of a numerically valued Lens into your Monad's state and return the result.

When you do not need the result of the subtraction, (-=) is more flexible.

(<-=) :: (MonadState s m, Num a) => Lens' s a -> a -> m a
(<-=) :: (MonadState s m, Num a) => Iso' s a -> a -> m a

(<+=) :: (MonadState s m, Num a) => LensLike' ((,) a) s a -> a -> m a infix 4 #

Add to the target of a numerically valued Lens into your Monad's state and return the result.

When you do not need the result of the addition, (+=) is more flexible.

(<+=) :: (MonadState s m, Num a) => Lens' s a -> a -> m a
(<+=) :: (MonadState s m, Num a) => Iso' s a -> a -> m a

(<%=) :: MonadState s m => LensLike ((,) b) s s a b -> (a -> b) -> m b infix 4 #

Modify the target of a Lens into your Monad's state by a user supplied function and return the result.

When applied to a Traversal, it this will return a monoidal summary of all of the intermediate results.

When you do not need the result of the operation, (%=) is more flexible.

(<%=) :: MonadState s m             => Lens' s a      -> (a -> a) -> m a
(<%=) :: MonadState s m             => Iso' s a       -> (a -> a) -> m a
(<%=) :: (MonadState s m, Monoid a) => Traversal' s a -> (a -> a) -> m a

(<<<>~) :: Semigroup r => LensLike' ((,) r) s r -> r -> s -> (r, s) infixr 4 #

Modify the target of a monoidally valued Lens by using (<>) a new value and return the old value.

When you do not need the old value, (<>~) is more flexible.

>>> (Sum a,b) & _1 <<<>~ Sum c
(Sum {getSum = a},(Sum {getSum = a + c},b))

>>> _2 <<<>~ ", 007" $ ("James", "Bond")
("Bond",("James","Bond, 007"))

(<<<>~) :: Semigroup r => Lens' s r -> r -> s -> (r, s)
(<<<>~) :: Semigroup r => Iso' s r -> r -> s -> (r, s)

(<<&&~) :: LensLike' ((,) Bool) s Bool -> Bool -> s -> (Bool, s) infixr 4 #

Logically && the target of a Bool-valued Lens and return the old value.

When you do not need the old value, (&&~) is more flexible.

>>> (False,6) & _1 <<&&~ True
(False,(False,6))

>>> ("hello",True) & _2 <<&&~ False
(True,("hello",False))

(<<&&~) :: Lens' s Bool -> Bool -> s -> (Bool, s)
(<<&&~) :: Iso' s Bool -> Bool -> s -> (Bool, s)

(<<||~) :: LensLike' ((,) Bool) s Bool -> Bool -> s -> (Bool, s) infixr 4 #

Logically || the target of a Bool-valued Lens and return the old value.

When you do not need the old value, (||~) is more flexible.

>>> (False,6) & _1 <<||~ True
(False,(True,6))

>>> ("hello",True) & _2 <<||~ False
(True,("hello",True))

(<<||~) :: Lens' s Bool -> Bool -> s -> (Bool, s)
(<<||~) :: Iso' s Bool -> Bool -> s -> (Bool, s)

(<<**~) :: Floating a => LensLike' ((,) a) s a -> a -> s -> (a, s) infixr 4 #

Raise the target of a floating-point valued Lens to an arbitrary power and return the old value.

When you do not need the old value, (**~) is more flexible.

>>> (a,b) & _1 <<**~ c
(a,(a**c,b))

>>> (a,b) & _2 <<**~ c
(b,(a,b**c))

(<<**~) :: Floating a => Lens' s a -> a -> s -> (a, s)
(<<**~) :: Floating a => Iso' s a -> a -> s -> (a, s)

(<<^^~) :: (Fractional a, Integral e) => LensLike' ((,) a) s a -> e -> s -> (a, s) infixr 4 #

Raise the target of a fractionally valued Lens to an integral power and return the old value.

When you do not need the old value, (^^~) is more flexible.

(<<^^~) :: (Fractional a, Integral e) => Lens' s a -> e -> s -> (a, s)
(<<^^~) :: (Fractional a, Integral e) => Iso' s a -> e -> S -> (a, s)

(<<^~) :: (Num a, Integral e) => LensLike' ((,) a) s a -> e -> s -> (a, s) infixr 4 #

Raise the target of a numerically valued Lens to a non-negative power and return the old value.

When you do not need the old value, (^~) is more flexible.

(<<^~) :: (Num a, Integral e) => Lens' s a -> e -> s -> (a, s)
(<<^~) :: (Num a, Integral e) => Iso' s a -> e -> s -> (a, s)

(<<//~) :: Fractional a => LensLike' ((,) a) s a -> a -> s -> (a, s) infixr 4 #

Divide the target of a numerically valued Lens and return the old value.

When you do not need the old value, (//~) is more flexible.

>>> (a,b) & _1 <<//~ c
(a,(a / c,b))

>>> ("Hawaii",10) & _2 <<//~ 2
(10.0,("Hawaii",5.0))

(<<//~) :: Fractional a => Lens' s a -> a -> s -> (a, s)
(<<//~) :: Fractional a => Iso' s a -> a -> s -> (a, s)

(<<*~) :: Num a => LensLike' ((,) a) s a -> a -> s -> (a, s) infixr 4 #

Multiply the target of a numerically valued Lens and return the old value.

When you do not need the old value, (-~) is more flexible.

>>> (a,b) & _1 <<*~ c
(a,(a * c,b))

>>> (a,b) & _2 <<*~ c
(b,(a,b * c))

(<<*~) :: Num a => Lens' s a -> a -> s -> (a, s)
(<<*~) :: Num a => Iso' s a -> a -> s -> (a, s)

(<<-~) :: Num a => LensLike' ((,) a) s a -> a -> s -> (a, s) infixr 4 #

Decrement the target of a numerically valued Lens and return the old value.

When you do not need the old value, (-~) is more flexible.

>>> (a,b) & _1 <<-~ c
(a,(a - c,b))

>>> (a,b) & _2 <<-~ c
(b,(a,b - c))

(<<-~) :: Num a => Lens' s a -> a -> s -> (a, s)
(<<-~) :: Num a => Iso' s a -> a -> s -> (a, s)

(<<+~) :: Num a => LensLike' ((,) a) s a -> a -> s -> (a, s) infixr 4 #

Increment the target of a numerically valued Lens and return the old value.

When you do not need the old value, (+~) is more flexible.

>>> (a,b) & _1 <<+~ c
(a,(a + c,b))

>>> (a,b) & _2 <<+~ c
(b,(a,b + c))

(<<+~) :: Num a => Lens' s a -> a -> s -> (a, s)
(<<+~) :: Num a => Iso' s a -> a -> s -> (a, s)

(<<?~) :: LensLike ((,) a) s t a (Maybe b) -> b -> s -> (a, t) infixr 4 #

Replace the target of a Lens with a Just value, but return the old value.

If you do not need the old value (?~) is more flexible.

>>> import qualified Data.Map as Map
>>> _2.at "hello" <<?~ "world" $ (42,Map.fromList [("goodnight","gracie")])
(Nothing,(42,fromList [("goodnight","gracie"),("hello","world")]))

(<<?~) :: Iso s t a (Maybe b)       -> b -> s -> (a, t)
(<<?~) :: Lens s t a (Maybe b)      -> b -> s -> (a, t)
(<<?~) :: Traversal s t a (Maybe b) -> b -> s -> (a, t)

(<<.~) :: LensLike ((,) a) s t a b -> b -> s -> (a, t) infixr 4 #

Replace the target of a Lens, but return the old value.

When you do not need the old value, (.~) is more flexible.

(<<.~) ::             Lens s t a b      -> b -> s -> (a, t)
(<<.~) ::             Iso s t a b       -> b -> s -> (a, t)
(<<.~) :: Monoid a => Traversal s t a b -> b -> s -> (a, t)

(<<%~) :: LensLike ((,) a) s t a b -> (a -> b) -> s -> (a, t) infixr 4 #

Modify the target of a Lens, but return the old value.

When you do not need the old value, (%~) is more flexible.

(<<%~) ::             Lens s t a b      -> (a -> b) -> s -> (a, t)
(<<%~) ::             Iso s t a b       -> (a -> b) -> s -> (a, t)
(<<%~) :: Monoid a => Traversal s t a b -> (a -> b) -> s -> (a, t)

(<&&~) :: LensLike ((,) Bool) s t Bool Bool -> Bool -> s -> (Bool, t) infixr 4 #

Logically && a Boolean valued Lens and return the result.

When you do not need the result of the operation, (&&~) is more flexible.

(<&&~) :: Lens' s Bool -> Bool -> s -> (Bool, s)
(<&&~) :: Iso' s Bool  -> Bool -> s -> (Bool, s)

(<||~) :: LensLike ((,) Bool) s t Bool Bool -> Bool -> s -> (Bool, t) infixr 4 #

Logically || a Boolean valued Lens and return the result.

When you do not need the result of the operation, (||~) is more flexible.

(<||~) :: Lens' s Bool -> Bool -> s -> (Bool, s)
(<||~) :: Iso' s Bool  -> Bool -> s -> (Bool, s)

(<**~) :: Floating a => LensLike ((,) a) s t a a -> a -> s -> (a, t) infixr 4 #

Raise the target of a floating-point valued Lens to an arbitrary power and return the result.

When you do not need the result of the operation, (**~) is more flexible.

(<**~) :: Floating a => Lens' s a -> a -> s -> (a, s)
(<**~) :: Floating a => Iso' s a  -> a -> s -> (a, s)

(<^^~) :: (Fractional a, Integral e) => LensLike ((,) a) s t a a -> e -> s -> (a, t) infixr 4 #

Raise the target of a fractionally valued Lens to an Integral power and return the result.

When you do not need the result of the operation, (^^~) is more flexible.

(<^^~) :: (Fractional a, Integral e) => Lens' s a -> e -> s -> (a, s)
(<^^~) :: (Fractional a, Integral e) => Iso' s a -> e -> s -> (a, s)

(<^~) :: (Num a, Integral e) => LensLike ((,) a) s t a a -> e -> s -> (a, t) infixr 4 #

Raise the target of a numerically valued Lens to a non-negative Integral power and return the result.

When you do not need the result of the operation, (^~) is more flexible.

(<^~) :: (Num a, Integral e) => Lens' s a -> e -> s -> (a, s)
(<^~) :: (Num a, Integral e) => Iso' s a -> e -> s -> (a, s)

(<//~) :: Fractional a => LensLike ((,) a) s t a a -> a -> s -> (a, t) infixr 4 #

Divide the target of a fractionally valued Lens and return the result.

When you do not need the result of the division, (//~) is more flexible.

(<//~) :: Fractional a => Lens' s a -> a -> s -> (a, s)
(<//~) :: Fractional a => Iso'  s a -> a -> s -> (a, s)

(<*~) :: Num a => LensLike ((,) a) s t a a -> a -> s -> (a, t) infixr 4 #

Multiply the target of a numerically valued Lens and return the result.

When you do not need the result of the multiplication, (*~) is more flexible.

(<*~) :: Num a => Lens' s a -> a -> s -> (a, s)
(<*~) :: Num a => Iso'  s a -> a -> s -> (a, s)

(<-~) :: Num a => LensLike ((,) a) s t a a -> a -> s -> (a, t) infixr 4 #

Decrement the target of a numerically valued Lens and return the result.

When you do not need the result of the subtraction, (-~) is more flexible.

(<-~) :: Num a => Lens' s a -> a -> s -> (a, s)
(<-~) :: Num a => Iso' s a  -> a -> s -> (a, s)

(<+~) :: Num a => LensLike ((,) a) s t a a -> a -> s -> (a, t) infixr 4 #

Increment the target of a numerically valued Lens and return the result.

When you do not need the result of the addition, (+~) is more flexible.

(<+~) :: Num a => Lens' s a -> a -> s -> (a, s)
(<+~) :: Num a => Iso' s a  -> a -> s -> (a, s)

(<%~) :: LensLike ((,) b) s t a b -> (a -> b) -> s -> (b, t) infixr 4 #

Modify the target of a Lens and return the result.

When you do not need the result of the operation, (%~) is more flexible.

(<%~) ::             Lens s t a b      -> (a -> b) -> s -> (b, t)
(<%~) ::             Iso s t a b       -> (a -> b) -> s -> (b, t)
(<%~) :: Monoid b => Traversal s t a b -> (a -> b) -> s -> (b, t)

cloneIndexedLens :: AnIndexedLens i s t a b -> IndexedLens i s t a b #

Clone an IndexedLens as an IndexedLens with the same index.

cloneIndexPreservingLens :: ALens s t a b -> IndexPreservingLens s t a b #

Clone a Lens as an IndexedPreservingLens that just passes through whatever index is on any IndexedLens, IndexedFold, IndexedGetter or IndexedTraversal it is composed with.

cloneLens :: ALens s t a b -> Lens s t a b #

Cloning a Lens is one way to make sure you aren't given something weaker, such as a Traversal and can be used as a way to pass around lenses that have to be monomorphic in f.

Note: This only accepts a proper Lens.

>>> let example l x = set (cloneLens l) (x^.cloneLens l + 1) x in example _2 ("hello",1,"you")
("hello",2,"you")

locus :: forall (p :: Type -> Type -> Type -> Type) a c s b. IndexedComonadStore p => Lens (p a c s) (p b c s) a b #

This Lens lets you view the current pos of any indexed store comonad and seek to a new position. This reduces the API for working these instances to a single Lens.

ipos w ≡ w ^. locus
iseek s w ≡ w & locus .~ s
iseeks f w ≡ w & locus %~ f

locus :: Lens' (Context' a s) a
locus :: Conjoined p => Lens' (Pretext' p a s) a
locus :: Conjoined p => Lens' (PretextT' p g a s) a

alongside :: LensLike (AlongsideLeft f b') s t a b -> LensLike (AlongsideRight f t) s' t' a' b' -> LensLike f (s, s') (t, t') (a, a') (b, b') #

alongside makes a Lens from two other lenses or a Getter from two other getters by executing them on their respective halves of a product.

>>> (Left a, Right b)^.alongside chosen chosen
(a,b)

>>> (Left a, Right b) & alongside chosen chosen .~ (c,d)
(Left c,Right d)

alongside :: Lens   s t a b -> Lens   s' t' a' b' -> Lens   (s,s') (t,t') (a,a') (b,b')
alongside :: Getter s   a   -> Getter s'    a'    -> Getter (s,s')        (a,a')

chosen :: IndexPreservingLens (Either a a) (Either b b) a b #

This is a Lens that updates either side of an Either, where both sides have the same type.

chosen ≡ choosing id id

>>> Left a^.chosen
a

>>> Right a^.chosen
a

>>> Right "hello"^.chosen
"hello"

>>> Right a & chosen *~ b
Right (a * b)

chosen :: Lens (Either a a) (Either b b) a b
chosen f (Left a)  = Left <$> f a
chosen f (Right a) = Right <$> f a

choosing :: Functor f => LensLike f s t a b -> LensLike f s' t' a b -> LensLike f (Either s s') (Either t t') a b #

Merge two lenses, getters, setters, folds or traversals.

chosen ≡ choosing id id

choosing :: Getter s a     -> Getter s' a     -> Getter (Either s s') a
choosing :: Fold s a       -> Fold s' a       -> Fold (Either s s') a
choosing :: Lens' s a      -> Lens' s' a      -> Lens' (Either s s') a
choosing :: Traversal' s a -> Traversal' s' a -> Traversal' (Either s s') a
choosing :: Setter' s a    -> Setter' s' a    -> Setter' (Either s s') a

(??) :: Functor f => f (a -> b) -> a -> f b infixl 1 #

This is convenient to flip argument order of composite functions defined as:

fab ?? a = fmap ($ a) fab

For the Functor instance f = ((->) r) you can reason about this function as if the definition was (??) ≡ flip:

>>> (h ?? x) a
h a x

>>> execState ?? [] $ modify (1:)
[1]

>>> over _2 ?? ("hello","world") $ length
("hello",5)

>>> over ?? length ?? ("hello","world") $ _2
("hello",5)

(%%=) :: forall {k} s m p r (a :: k) b. MonadState s m => Over p ((,) r) s s a b -> p a (r, b) -> m r infix 4 #

Modify the target of a Lens in the current state returning some extra information of type r or modify all targets of a Traversal in the current state, extracting extra information of type r and return a monoidal summary of the changes.

>>> runState (_1 %%= \x -> (f x, g x)) (a,b)
(f a,(g a,b))

(%%=) ≡ (state .)

It may be useful to think of (%%=), instead, as having either of the following more restricted type signatures:

(%%=) :: MonadState s m             => Iso s s a b       -> (a -> (r, b)) -> m r
(%%=) :: MonadState s m             => Lens s s a b      -> (a -> (r, b)) -> m r
(%%=) :: (MonadState s m, Monoid r) => Traversal s s a b -> (a -> (r, b)) -> m r

(%%~) :: forall {k} f s (t :: k) a (b :: k). LensLike f s t a b -> (a -> f b) -> s -> f t infixr 4 #

(%%~) can be used in one of two scenarios:

When applied to a Lens, it can edit the target of the Lens in a structure, extracting a functorial result.

When applied to a Traversal, it can edit the targets of the traversals, extracting an applicative summary of its actions.

>>> [66,97,116,109,97,110] & each %%~ \a -> ("na", chr a)
("nananananana","Batman")

For all that the definition of this combinator is just:

(%%~) ≡ id

It may be beneficial to think about it as if it had these even more restricted types, however:

(%%~) :: Functor f =>     Iso s t a b       -> (a -> f b) -> s -> f t
(%%~) :: Functor f =>     Lens s t a b      -> (a -> f b) -> s -> f t
(%%~) :: Applicative f => Traversal s t a b -> (a -> f b) -> s -> f t

When applied to a Traversal, it can edit the targets of the traversals, extracting a supplemental monoidal summary of its actions, by choosing f = ((,) m)

(%%~) ::             Iso s t a b       -> (a -> (r, b)) -> s -> (r, t)
(%%~) ::             Lens s t a b      -> (a -> (r, b)) -> s -> (r, t)
(%%~) :: Monoid m => Traversal s t a b -> (a -> (m, b)) -> s -> (m, t)

(&~) :: s -> State s a -> s infixl 1 #

This can be used to chain lens operations using op= syntax rather than op~ syntax for simple non-type-changing cases.

>>> (10,20) & _1 .~ 30 & _2 .~ 40
(30,40)

>>> (10,20) &~ do _1 .= 30; _2 .= 40
(30,40)

This does not support type-changing assignment, e.g.

>>> (10,20) & _1 .~ "hello"
("hello",20)

ilens :: (s -> (i, a)) -> (s -> b -> t) -> IndexedLens i s t a b #

Build an IndexedLens from a Getter and a Setter.

iplens :: (s -> a) -> (s -> b -> t) -> IndexPreservingLens s t a b #

Build an index-preserving Lens from a Getter and a Setter.

withLens :: forall s t a b (rep :: RuntimeRep) (r :: TYPE rep). ALens s t a b -> ((s -> a) -> (s -> b -> t) -> r) -> r #

Obtain a getter and a setter from a lens, reversing lens.

lens :: (s -> a) -> (s -> b -> t) -> Lens s t a b #

Build a Lens from a getter and a setter.

lens :: Functor f => (s -> a) -> (s -> b -> t) -> (a -> f b) -> s -> f t

>>> s ^. lens getter setter
getter s

>>> s & lens getter setter .~ b
setter s b

>>> s & lens getter setter %~ f
setter s (f (getter s))

lens :: (s -> a) -> (s -> a -> s) -> Lens' s a

type ALens s t a b = LensLike (Pretext (->) a b) s t a b #

When you see this as an argument to a function, it expects a Lens.

This type can also be used when you need to store a Lens in a container, since it is rank-1. You can turn them back into a Lens with cloneLens, or use it directly with combinators like storing and (^#).

type ALens' s a = ALens s s a a #

type ALens' = Simple ALens

type AnIndexedLens i s t a b = Optical (Indexed i) (->) (Pretext (Indexed i) a b) s t a b #

When you see this as an argument to a function, it expects an IndexedLens

type AnIndexedLens' i s a = AnIndexedLens i s s a a #

type AnIndexedLens' = Simple (AnIndexedLens i)

imapOf :: AnIndexedSetter i s t a b -> (i -> a -> b) -> s -> t #

Map with index. (Deprecated alias for iover).

When you do not need access to the index, then mapOf is more liberal in what it can accept.

mapOf l ≡ imapOf l . const

imapOf :: IndexedSetter i s t a b    -> (i -> a -> b) -> s -> t
imapOf :: IndexedLens i s t a b      -> (i -> a -> b) -> s -> t
imapOf :: IndexedTraversal i s t a b -> (i -> a -> b) -> s -> t

mapOf :: ASetter s t a b -> (a -> b) -> s -> t #

mapOf is a deprecated alias for over.

assignA :: Arrow p => ASetter s t a b -> p s b -> p s t #

Run an arrow command and use the output to set all the targets of a Lens, Setter or Traversal to the result.

assignA can be used very similarly to (<~), except that the type of the object being modified can change; for example:

runKleisli action ((), (), ()) where
  action =      assignA _1 (Kleisli (const getVal1))
           >>> assignA _2 (Kleisli (const getVal2))
           >>> assignA _3 (Kleisli (const getVal3))
  getVal1 :: Either String Int
  getVal1 = ...
  getVal2 :: Either String Bool
  getVal2 = ...
  getVal3 :: Either String Char
  getVal3 = ...

has the type Either String (Int, Bool, Char)

assignA :: Arrow p => Iso s t a b       -> p s b -> p s t
assignA :: Arrow p => Lens s t a b      -> p s b -> p s t
assignA :: Arrow p => Traversal s t a b -> p s b -> p s t
assignA :: Arrow p => Setter s t a b    -> p s b -> p s t

(.@=) :: MonadState s m => AnIndexedSetter i s s a b -> (i -> b) -> m () infix 4 #

Replace every target in the current state of an IndexedSetter, IndexedLens or IndexedTraversal with access to the index.

When you do not need access to the index then (.=) is more liberal in what it can accept.

l .= b ≡ l .@= const b

(.@=) :: MonadState s m => IndexedSetter i s s a b    -> (i -> b) -> m ()
(.@=) :: MonadState s m => IndexedLens i s s a b      -> (i -> b) -> m ()
(.@=) :: MonadState s m => IndexedTraversal i s t a b -> (i -> b) -> m ()

imodifying :: MonadState s m => AnIndexedSetter i s s a b -> (i -> a -> b) -> m () #

This is an alias for (%@=).

(%@=) :: MonadState s m => AnIndexedSetter i s s a b -> (i -> a -> b) -> m () infix 4 #

Adjust every target in the current state of an IndexedSetter, IndexedLens or IndexedTraversal with access to the index.

When you do not need access to the index then (%=) is more liberal in what it can accept.

l %= f ≡ l %@= const f

(%@=) :: MonadState s m => IndexedSetter i s s a b    -> (i -> a -> b) -> m ()
(%@=) :: MonadState s m => IndexedLens i s s a b      -> (i -> a -> b) -> m ()
(%@=) :: MonadState s m => IndexedTraversal i s t a b -> (i -> a -> b) -> m ()

(.@~) :: AnIndexedSetter i s t a b -> (i -> b) -> s -> t infixr 4 #

Replace every target of an IndexedSetter, IndexedLens or IndexedTraversal with access to the index.

(.@~) ≡ iset

When you do not need access to the index then (.~) is more liberal in what it can accept.

l .~ b ≡ l .@~ const b

(.@~) :: IndexedSetter i s t a b    -> (i -> b) -> s -> t
(.@~) :: IndexedLens i s t a b      -> (i -> b) -> s -> t
(.@~) :: IndexedTraversal i s t a b -> (i -> b) -> s -> t

(%@~) :: AnIndexedSetter i s t a b -> (i -> a -> b) -> s -> t infixr 4 #

Adjust every target of an IndexedSetter, IndexedLens or IndexedTraversal with access to the index.

(%@~) ≡ iover

When you do not need access to the index then (%~) is more liberal in what it can accept.

l %~ f ≡ l %@~ const f

(%@~) :: IndexedSetter i s t a b    -> (i -> a -> b) -> s -> t
(%@~) :: IndexedLens i s t a b      -> (i -> a -> b) -> s -> t
(%@~) :: IndexedTraversal i s t a b -> (i -> a -> b) -> s -> t

isets :: ((i -> a -> b) -> s -> t) -> IndexedSetter i s t a b #

Build an IndexedSetter from an imap-like function.

Your supplied function f is required to satisfy:

f id ≡ id
f g . f h ≡ f (g . h)

Equational reasoning:

isets . iover ≡ id
iover . isets ≡ id

Another way to view isets is that it takes a "semantic editor combinator" which has been modified to carry an index and transforms it into a IndexedSetter.

iset :: AnIndexedSetter i s t a b -> (i -> b) -> s -> t #

Set with index. Equivalent to iover with the current value ignored.

When you do not need access to the index, then set is more liberal in what it can accept.

set l ≡ iset l . const

iset :: IndexedSetter i s t a b    -> (i -> b) -> s -> t
iset :: IndexedLens i s t a b      -> (i -> b) -> s -> t
iset :: IndexedTraversal i s t a b -> (i -> b) -> s -> t

iover :: AnIndexedSetter i s t a b -> (i -> a -> b) -> s -> t #

Map with index. This is an alias for imapOf.

When you do not need access to the index, then over is more liberal in what it can accept.

over l ≡ iover l . const
iover l ≡ over l . Indexed

iover :: IndexedSetter i s t a b    -> (i -> a -> b) -> s -> t
iover :: IndexedLens i s t a b      -> (i -> a -> b) -> s -> t
iover :: IndexedTraversal i s t a b -> (i -> a -> b) -> s -> t

ilocally :: MonadReader s m => AnIndexedSetter i s s a b -> (i -> a -> b) -> m r -> m r #

This is a generalization of locally that allows one to make indexed local changes to a Reader environment associated with the target of a Setter, Lens, or Traversal.

locally l f ≡ ilocally l f . const
ilocally l f ≡ locally l f . Indexed

ilocally :: MonadReader s m => IndexedLens s s a b      -> (i -> a -> b) -> m r -> m r
ilocally :: MonadReader s m => IndexedTraversal s s a b -> (i -> a -> b) -> m r -> m r
ilocally :: MonadReader s m => IndexedSetter s s a b    -> (i -> a -> b) -> m r -> m r

locally :: MonadReader s m => ASetter s s a b -> (a -> b) -> m r -> m r #

Modify the value of the Reader environment associated with the target of a Setter, Lens, or Traversal.

locally l id a ≡ a
locally l f . locally l g ≡ locally l (f . g)

>>> (1,1) & locally _1 (+1) (uncurry (+))
3

>>> "," & locally ($) ("Hello" <>) (<> " world!")
"Hello, world!"

locally :: MonadReader s m => Iso s s a b       -> (a -> b) -> m r -> m r
locally :: MonadReader s m => Lens s s a b      -> (a -> b) -> m r -> m r
locally :: MonadReader s m => Traversal s s a b -> (a -> b) -> m r -> m r
locally :: MonadReader s m => Setter s s a b    -> (a -> b) -> m r -> m r

icensoring :: MonadWriter w m => IndexedSetter i w w u v -> (i -> u -> v) -> m a -> m a #

This is a generalization of censor that allows you to censor just a portion of the resulting MonadWriter, with access to the index of an IndexedSetter.

censoring :: MonadWriter w m => Setter w w u v -> (u -> v) -> m a -> m a #

This is a generalization of censor that allows you to censor just a portion of the resulting MonadWriter.

ipassing :: MonadWriter w m => IndexedSetter i w w u v -> m (a, i -> u -> v) -> m a #

This is a generalization of pass that allows you to modify just a portion of the resulting MonadWriter with access to the index of an IndexedSetter.

passing :: MonadWriter w m => Setter w w u v -> m (a, u -> v) -> m a #

This is a generalization of pass that allows you to modify just a portion of the resulting MonadWriter.

scribe :: (MonadWriter t m, Monoid s) => ASetter s t a b -> b -> m () #

Write to a fragment of a larger Writer format.

(<>=) :: (MonadState s m, Semigroup a) => ASetter' s a -> a -> m () infix 4 #

Modify the target(s) of a Lens', Iso, Setter or Traversal by using (<>).

>>> execState (do _1 <>= Sum c; _2 <>= Product d) (Sum a,Product b)
(Sum {getSum = a + c},Product {getProduct = b * d})

>>> execState (both <>= "!!!") ("hello","world")
("hello!!!","world!!!")

(<>=) :: (MonadState s m, Semigroup a) => Setter' s a -> a -> m ()
(<>=) :: (MonadState s m, Semigroup a) => Iso' s a -> a -> m ()
(<>=) :: (MonadState s m, Semigroup a) => Lens' s a -> a -> m ()
(<>=) :: (MonadState s m, Semigroup a) => Traversal' s a -> a -> m ()

(<>~) :: Semigroup a => ASetter s t a a -> a -> s -> t infixr 4 #

Modify the target of a Semigroup value by using (<>).

>>> (Sum a,b) & _1 <>~ Sum c
(Sum {getSum = a + c},b)

>>> (Sum a,Sum b) & both <>~ Sum c
(Sum {getSum = a + c},Sum {getSum = b + c})

>>> both <>~ "!!!" $ ("hello","world")
("hello!!!","world!!!")

(<>~) :: Semigroup a => Setter s t a a    -> a -> s -> t
(<>~) :: Semigroup a => Iso s t a a       -> a -> s -> t
(<>~) :: Semigroup a => Lens s t a a      -> a -> s -> t
(<>~) :: Semigroup a => Traversal s t a a -> a -> s -> t

(<?=) :: MonadState s m => ASetter s s a (Maybe b) -> b -> m b infix 4 #

Set Just a value with pass-through

This is useful for chaining assignment without round-tripping through your Monad stack.

do x <- at "foo" <?= ninety_nine_bottles_of_beer_on_the_wall

If you do not need a copy of the intermediate result, then using l ?= d will avoid unused binding warnings.

(<?=) :: MonadState s m => Setter s s a (Maybe b)    -> b -> m b
(<?=) :: MonadState s m => Iso s s a (Maybe b)       -> b -> m b
(<?=) :: MonadState s m => Lens s s a (Maybe b)      -> b -> m b
(<?=) :: MonadState s m => Traversal s s a (Maybe b) -> b -> m b

(<.=) :: MonadState s m => ASetter s s a b -> b -> m b infix 4 #

Set with pass-through

This is useful for chaining assignment without round-tripping through your Monad stack.

do x <- _2 <.= ninety_nine_bottles_of_beer_on_the_wall

If you do not need a copy of the intermediate result, then using l .= d will avoid unused binding warnings.

(<.=) :: MonadState s m => Setter s s a b    -> b -> m b
(<.=) :: MonadState s m => Iso s s a b       -> b -> m b
(<.=) :: MonadState s m => Lens s s a b      -> b -> m b
(<.=) :: MonadState s m => Traversal s s a b -> b -> m b

(<~) :: MonadState s m => ASetter s s a b -> m b -> m () infixr 2 #

Run a monadic action, and set all of the targets of a Lens, Setter or Traversal to its result.

(<~) :: MonadState s m => Iso s s a b       -> m b -> m ()
(<~) :: MonadState s m => Lens s s a b      -> m b -> m ()
(<~) :: MonadState s m => Traversal s s a b -> m b -> m ()
(<~) :: MonadState s m => Setter s s a b    -> m b -> m ()

As a reasonable mnemonic, this lets you store the result of a monadic action in a Lens rather than in a local variable.

do foo <- bar
   ...

will store the result in a variable, while

do foo <~ bar
   ...

will store the result in a Lens, Setter, or Traversal.

(||=) :: MonadState s m => ASetter' s Bool -> Bool -> m () infix 4 #

Modify the target(s) of a Lens', 'Iso, Setter or Traversal by taking their logical || with a value.

>>> execState (do _1 ||= True; _2 ||= False; _3 ||= True; _4 ||= False) (True,True,False,False)
(True,True,True,False)

(||=) :: MonadState s m => Setter' s Bool    -> Bool -> m ()
(||=) :: MonadState s m => Iso' s Bool       -> Bool -> m ()
(||=) :: MonadState s m => Lens' s Bool      -> Bool -> m ()
(||=) :: MonadState s m => Traversal' s Bool -> Bool -> m ()

(&&=) :: MonadState s m => ASetter' s Bool -> Bool -> m () infix 4 #

Modify the target(s) of a Lens', Iso, Setter or Traversal by taking their logical && with a value.

>>> execState (do _1 &&= True; _2 &&= False; _3 &&= True; _4 &&= False) (True,True,False,False)
(True,False,False,False)

(&&=) :: MonadState s m => Setter' s Bool    -> Bool -> m ()
(&&=) :: MonadState s m => Iso' s Bool       -> Bool -> m ()
(&&=) :: MonadState s m => Lens' s Bool      -> Bool -> m ()
(&&=) :: MonadState s m => Traversal' s Bool -> Bool -> m ()

(**=) :: (MonadState s m, Floating a) => ASetter' s a -> a -> m () infix 4 #

Raise the target(s) of a numerically valued Lens, Setter or Traversal to an arbitrary power

>>> execState (do _1 **= c; _2 **= d) (a,b)
(a**c,b**d)

(**=) ::  (MonadState s m, Floating a) => Setter' s a    -> a -> m ()
(**=) ::  (MonadState s m, Floating a) => Iso' s a       -> a -> m ()
(**=) ::  (MonadState s m, Floating a) => Lens' s a      -> a -> m ()
(**=) ::  (MonadState s m, Floating a) => Traversal' s a -> a -> m ()

(^^=) :: (MonadState s m, Fractional a, Integral e) => ASetter' s a -> e -> m () infix 4 #

Raise the target(s) of a numerically valued Lens, Setter or Traversal to an integral power.

(^^=) ::  (MonadState s m, Fractional a, Integral e) => Setter' s a    -> e -> m ()
(^^=) ::  (MonadState s m, Fractional a, Integral e) => Iso' s a       -> e -> m ()
(^^=) ::  (MonadState s m, Fractional a, Integral e) => Lens' s a      -> e -> m ()
(^^=) ::  (MonadState s m, Fractional a, Integral e) => Traversal' s a -> e -> m ()

(^=) :: (MonadState s m, Num a, Integral e) => ASetter' s a -> e -> m () infix 4 #

Raise the target(s) of a numerically valued Lens, Setter or Traversal to a non-negative integral power.

(^=) ::  (MonadState s m, Num a, Integral e) => Setter' s a    -> e -> m ()
(^=) ::  (MonadState s m, Num a, Integral e) => Iso' s a       -> e -> m ()
(^=) ::  (MonadState s m, Num a, Integral e) => Lens' s a      -> e -> m ()
(^=) ::  (MonadState s m, Num a, Integral e) => Traversal' s a -> e -> m ()

(//=) :: (MonadState s m, Fractional a) => ASetter' s a -> a -> m () infix 4 #

Modify the target(s) of a Lens', Iso, Setter or Traversal by dividing by a value.

>>> execState (do _1 //= c; _2 //= d) (a,b)
(a / c,b / d)

(//=) :: (MonadState s m, Fractional a) => Setter' s a    -> a -> m ()
(//=) :: (MonadState s m, Fractional a) => Iso' s a       -> a -> m ()
(//=) :: (MonadState s m, Fractional a) => Lens' s a      -> a -> m ()
(//=) :: (MonadState s m, Fractional a) => Traversal' s a -> a -> m ()

(*=) :: (MonadState s m, Num a) => ASetter' s a -> a -> m () infix 4 #

Modify the target(s) of a Lens', Iso, Setter or Traversal by multiplying by value.

>>> execState (do _1 *= c; _2 *= d) (a,b)
(a * c,b * d)

(*=) :: (MonadState s m, Num a) => Setter' s a    -> a -> m ()
(*=) :: (MonadState s m, Num a) => Iso' s a       -> a -> m ()
(*=) :: (MonadState s m, Num a) => Lens' s a      -> a -> m ()
(*=) :: (MonadState s m, Num a) => Traversal' s a -> a -> m ()

(-=) :: (MonadState s m, Num a) => ASetter' s a -> a -> m () infix 4 #

Modify the target(s) of a Lens', Iso, Setter or Traversal by subtracting a value.

>>> execState (do _1 -= c; _2 -= d) (a,b)
(a - c,b - d)

(-=) :: (MonadState s m, Num a) => Setter' s a    -> a -> m ()
(-=) :: (MonadState s m, Num a) => Iso' s a       -> a -> m ()
(-=) :: (MonadState s m, Num a) => Lens' s a      -> a -> m ()
(-=) :: (MonadState s m, Num a) => Traversal' s a -> a -> m ()

(+=) :: (MonadState s m, Num a) => ASetter' s a -> a -> m () infix 4 #

Modify the target(s) of a Lens', Iso, Setter or Traversal by adding a value.

Example:

fresh :: MonadState Int m => m Int
fresh = do
  id += 1
  use id

>>> execState (do _1 += c; _2 += d) (a,b)
(a + c,b + d)

>>> execState (do _1.at 1.non 0 += 10) (Map.fromList [(2,100)],"hello")
(fromList [(1,10),(2,100)],"hello")

(+=) :: (MonadState s m, Num a) => Setter' s a    -> a -> m ()
(+=) :: (MonadState s m, Num a) => Iso' s a       -> a -> m ()
(+=) :: (MonadState s m, Num a) => Lens' s a      -> a -> m ()
(+=) :: (MonadState s m, Num a) => Traversal' s a -> a -> m ()

(?=) :: MonadState s m => ASetter s s a (Maybe b) -> b -> m () infix 4 #

Replace the target of a Lens or all of the targets of a Setter or Traversal in our monadic state with Just a new value, irrespective of the old.

>>> execState (do at 1 ?= a; at 2 ?= b) Map.empty
fromList [(1,a),(2,b)]

>>> execState (do _1 ?= b; _2 ?= c) (Just a, Nothing)
(Just b,Just c)

(?=) :: MonadState s m => Iso' s (Maybe a)       -> a -> m ()
(?=) :: MonadState s m => Lens' s (Maybe a)      -> a -> m ()
(?=) :: MonadState s m => Traversal' s (Maybe a) -> a -> m ()
(?=) :: MonadState s m => Setter' s (Maybe a)    -> a -> m ()

modifying :: MonadState s m => ASetter s s a b -> (a -> b) -> m () #

This is an alias for (%=).

(%=) :: MonadState s m => ASetter s s a b -> (a -> b) -> m () infix 4 #

Map over the target of a Lens or all of the targets of a Setter or Traversal in our monadic state.

>>> execState (do _1 %= f;_2 %= g) (a,b)
(f a,g b)

>>> execState (do both %= f) (a,b)
(f a,f b)

(%=) :: MonadState s m => Iso' s a       -> (a -> a) -> m ()
(%=) :: MonadState s m => Lens' s a      -> (a -> a) -> m ()
(%=) :: MonadState s m => Traversal' s a -> (a -> a) -> m ()
(%=) :: MonadState s m => Setter' s a    -> (a -> a) -> m ()

(%=) :: MonadState s m => ASetter s s a b -> (a -> b) -> m ()

(.=) :: MonadState s m => ASetter s s a b -> b -> m () infix 4 #

Replace the target of a Lens or all of the targets of a Setter or Traversal in our monadic state with a new value, irrespective of the old.

This is an infix version of assign.

>>> execState (do _1 .= c; _2 .= d) (a,b)
(c,d)

>>> execState (both .= c) (a,b)
(c,c)

(.=) :: MonadState s m => Iso' s a       -> a -> m ()
(.=) :: MonadState s m => Lens' s a      -> a -> m ()
(.=) :: MonadState s m => Traversal' s a -> a -> m ()
(.=) :: MonadState s m => Setter' s a    -> a -> m ()

It puts the state in the monad or it gets the hose again.

assign :: MonadState s m => ASetter s s a b -> b -> m () #

Replace the target of a Lens or all of the targets of a Setter or Traversal in our monadic state with a new value, irrespective of the old.

This is an alias for (.=).

>>> execState (do assign _1 c; assign _2 d) (a,b)
(c,d)

>>> execState (both .= c) (a,b)
(c,c)

assign :: MonadState s m => Iso' s a       -> a -> m ()
assign :: MonadState s m => Lens' s a      -> a -> m ()
assign :: MonadState s m => Traversal' s a -> a -> m ()
assign :: MonadState s m => Setter' s a    -> a -> m ()

(&&~) :: ASetter s t Bool Bool -> Bool -> s -> t infixr 4 #

Logically && the target(s) of a Bool-valued Lens or Setter.

>>> both &&~ True $ (False, True)
(False,True)

>>> both &&~ False $ (False, True)
(False,False)

(&&~) :: Setter' s Bool    -> Bool -> s -> s
(&&~) :: Iso' s Bool       -> Bool -> s -> s
(&&~) :: Lens' s Bool      -> Bool -> s -> s
(&&~) :: Traversal' s Bool -> Bool -> s -> s

(||~) :: ASetter s t Bool Bool -> Bool -> s -> t infixr 4 #

Logically || the target(s) of a Bool-valued Lens or Setter.

>>> both ||~ True $ (False,True)
(True,True)

>>> both ||~ False $ (False,True)
(False,True)

(||~) :: Setter' s Bool    -> Bool -> s -> s
(||~) :: Iso' s Bool       -> Bool -> s -> s
(||~) :: Lens' s Bool      -> Bool -> s -> s
(||~) :: Traversal' s Bool -> Bool -> s -> s

(**~) :: Floating a => ASetter s t a a -> a -> s -> t infixr 4 #

Raise the target(s) of a floating-point valued Lens, Setter or Traversal to an arbitrary power.

>>> (a,b) & _1 **~ c
(a**c,b)

>>> (a,b) & both **~ c
(a**c,b**c)

>>> _2 **~ 10 $ (3,2)
(3,1024.0)

(**~) :: Floating a => Setter' s a    -> a -> s -> s
(**~) :: Floating a => Iso' s a       -> a -> s -> s
(**~) :: Floating a => Lens' s a      -> a -> s -> s
(**~) :: Floating a => Traversal' s a -> a -> s -> s

(^^~) :: (Fractional a, Integral e) => ASetter s t a a -> e -> s -> t infixr 4 #

Raise the target(s) of a fractionally valued Lens, Setter or Traversal to an integral power.

>>> (1,2) & _2 ^^~ (-1)
(1,0.5)

(^^~) :: (Fractional a, Integral e) => Setter' s a    -> e -> s -> s
(^^~) :: (Fractional a, Integral e) => Iso' s a       -> e -> s -> s
(^^~) :: (Fractional a, Integral e) => Lens' s a      -> e -> s -> s
(^^~) :: (Fractional a, Integral e) => Traversal' s a -> e -> s -> s

(^~) :: (Num a, Integral e) => ASetter s t a a -> e -> s -> t infixr 4 #

Raise the target(s) of a numerically valued Lens, Setter or Traversal to a non-negative integral power.

>>> (1,3) & _2 ^~ 2
(1,9)

(^~) :: (Num a, Integral e) => Setter' s a    -> e -> s -> s
(^~) :: (Num a, Integral e) => Iso' s a       -> e -> s -> s
(^~) :: (Num a, Integral e) => Lens' s a      -> e -> s -> s
(^~) :: (Num a, Integral e) => Traversal' s a -> e -> s -> s

(//~) :: Fractional a => ASetter s t a a -> a -> s -> t infixr 4 #

Divide the target(s) of a numerically valued Lens, Iso, Setter or Traversal.

>>> (a,b) & _1 //~ c
(a / c,b)

>>> (a,b) & both //~ c
(a / c,b / c)

>>> ("Hawaii",10) & _2 //~ 2
("Hawaii",5.0)

(//~) :: Fractional a => Setter' s a    -> a -> s -> s
(//~) :: Fractional a => Iso' s a       -> a -> s -> s
(//~) :: Fractional a => Lens' s a      -> a -> s -> s
(//~) :: Fractional a => Traversal' s a -> a -> s -> s

(-~) :: Num a => ASetter s t a a -> a -> s -> t infixr 4 #

Decrement the target(s) of a numerically valued Lens, Iso, Setter or Traversal.

>>> (a,b) & _1 -~ c
(a - c,b)

>>> (a,b) & both -~ c
(a - c,b - c)

>>> _1 -~ 2 $ (1,2)
(-1,2)

>>> mapped.mapped -~ 1 $ [[4,5],[6,7]]
[[3,4],[5,6]]

(-~) :: Num a => Setter' s a    -> a -> s -> s
(-~) :: Num a => Iso' s a       -> a -> s -> s
(-~) :: Num a => Lens' s a      -> a -> s -> s
(-~) :: Num a => Traversal' s a -> a -> s -> s

(*~) :: Num a => ASetter s t a a -> a -> s -> t infixr 4 #

Multiply the target(s) of a numerically valued Lens, Iso, Setter or Traversal.

>>> (a,b) & _1 *~ c
(a * c,b)

>>> (a,b) & both *~ c
(a * c,b * c)

>>> (1,2) & _2 *~ 4
(1,8)

>>> Just 24 & mapped *~ 2
Just 48

(*~) :: Num a => Setter' s a    -> a -> s -> s
(*~) :: Num a => Iso' s a       -> a -> s -> s
(*~) :: Num a => Lens' s a      -> a -> s -> s
(*~) :: Num a => Traversal' s a -> a -> s -> s

(+~) :: Num a => ASetter s t a a -> a -> s -> t infixr 4 #

Increment the target(s) of a numerically valued Lens, Setter or Traversal.

>>> (a,b) & _1 +~ c
(a + c,b)

>>> (a,b) & both +~ c
(a + c,b + c)

>>> (1,2) & _2 +~ 1
(1,3)

>>> [(a,b),(c,d)] & traverse.both +~ e
[(a + e,b + e),(c + e,d + e)]

(+~) :: Num a => Setter' s a    -> a -> s -> s
(+~) :: Num a => Iso' s a       -> a -> s -> s
(+~) :: Num a => Lens' s a      -> a -> s -> s
(+~) :: Num a => Traversal' s a -> a -> s -> s

(<?~) :: ASetter s t a (Maybe b) -> b -> s -> (b, t) infixr 4 #

Set to Just a value with pass-through.

This is mostly present for consistency, but may be useful for for chaining assignments.

If you do not need a copy of the intermediate result, then using l ?~ d directly is a good idea.

>>> import qualified Data.Map as Map
>>> _2.at "hello" <?~ "world" $ (42,Map.fromList [("goodnight","gracie")])
("world",(42,fromList [("goodnight","gracie"),("hello","world")]))

(<?~) :: Setter s t a (Maybe b)    -> b -> s -> (b, t)
(<?~) :: Iso s t a (Maybe b)       -> b -> s -> (b, t)
(<?~) :: Lens s t a (Maybe b)      -> b -> s -> (b, t)
(<?~) :: Traversal s t a (Maybe b) -> b -> s -> (b, t)

(<.~) :: ASetter s t a b -> b -> s -> (b, t) infixr 4 #

Set with pass-through.

This is mostly present for consistency, but may be useful for chaining assignments.

If you do not need a copy of the intermediate result, then using l .~ t directly is a good idea.

>>> (a,b) & _1 <.~ c
(c,(c,b))

>>> ("good","morning","vietnam") & _3 <.~ "world"
("world",("good","morning","world"))

>>> (42,Map.fromList [("goodnight","gracie")]) & _2.at "hello" <.~ Just "world"
(Just "world",(42,fromList [("goodnight","gracie"),("hello","world")]))

(<.~) :: Setter s t a b    -> b -> s -> (b, t)
(<.~) :: Iso s t a b       -> b -> s -> (b, t)
(<.~) :: Lens s t a b      -> b -> s -> (b, t)
(<.~) :: Traversal s t a b -> b -> s -> (b, t)

(?~) :: ASetter s t a (Maybe b) -> b -> s -> t infixr 4 #

Set the target of a Lens, Traversal or Setter to Just a value.

l ?~ t ≡ set l (Just t)

>>> Nothing & id ?~ a
Just a

>>> Map.empty & at 3 ?~ x
fromList [(3,x)]

?~ can be used type-changily:

>>> ('a', ('b', 'c')) & _2.both ?~ 'x'
('a',(Just 'x',Just 'x'))

(?~) :: Setter s t a (Maybe b)    -> b -> s -> t
(?~) :: Iso s t a (Maybe b)       -> b -> s -> t
(?~) :: Lens s t a (Maybe b)      -> b -> s -> t
(?~) :: Traversal s t a (Maybe b) -> b -> s -> t

(.~) :: ASetter s t a b -> b -> s -> t infixr 4 #

Replace the target of a Lens or all of the targets of a Setter or Traversal with a constant value.

This is an infix version of set, provided for consistency with (.=).

f <$ a ≡ mapped .~ f $ a

>>> (a,b,c,d) & _4 .~ e
(a,b,c,e)

>>> (42,"world") & _1 .~ "hello"
("hello","world")

>>> (a,b) & both .~ c
(c,c)

(.~) :: Setter s t a b    -> b -> s -> t
(.~) :: Iso s t a b       -> b -> s -> t
(.~) :: Lens s t a b      -> b -> s -> t
(.~) :: Traversal s t a b -> b -> s -> t

(%~) :: ASetter s t a b -> (a -> b) -> s -> t infixr 4 #

Modifies the target of a Lens or all of the targets of a Setter or Traversal with a user supplied function.

This is an infix version of over.

fmap f ≡ mapped %~ f
fmapDefault f ≡ traverse %~ f

>>> (a,b,c) & _3 %~ f
(a,b,f c)

>>> (a,b) & both %~ f
(f a,f b)

>>> _2 %~ length $ (1,"hello")
(1,5)

>>> traverse %~ f $ [a,b,c]
[f a,f b,f c]

>>> traverse %~ even $ [1,2,3]
[False,True,False]

>>> traverse.traverse %~ length $ [["hello","world"],["!!!"]]
[[5,5],[3]]

(%~) :: Setter s t a b    -> (a -> b) -> s -> t
(%~) :: Iso s t a b       -> (a -> b) -> s -> t
(%~) :: Lens s t a b      -> (a -> b) -> s -> t
(%~) :: Traversal s t a b -> (a -> b) -> s -> t

set' :: ASetter' s a -> a -> s -> s #

Replace the target of a Lens or all of the targets of a Setter' or Traversal with a constant value, without changing its type.

This is a type restricted version of set, which retains the type of the original.

>>> set' mapped x [a,b,c,d]
[x,x,x,x]

>>> set' _2 "hello" (1,"world")
(1,"hello")

>>> set' mapped 0 [1,2,3,4]
[0,0,0,0]

Note: Attempting to adjust set' a Fold or Getter will fail at compile time with an relatively nice error message.

set' :: Setter' s a    -> a -> s -> s
set' :: Iso' s a       -> a -> s -> s
set' :: Lens' s a      -> a -> s -> s
set' :: Traversal' s a -> a -> s -> s

set :: ASetter s t a b -> b -> s -> t #

Replace the target of a Lens or all of the targets of a Setter or Traversal with a constant value.

(<$) ≡ set mapped

>>> set _2 "hello" (1,())
(1,"hello")

>>> set mapped () [1,2,3,4]
[(),(),(),()]

Note: Attempting to set a Fold or Getter will fail at compile time with an relatively nice error message.

set :: Setter s t a b    -> b -> s -> t
set :: Iso s t a b       -> b -> s -> t
set :: Lens s t a b      -> b -> s -> t
set :: Traversal s t a b -> b -> s -> t

over :: ASetter s t a b -> (a -> b) -> s -> t #

Modify the target of a Lens or all the targets of a Setter or Traversal with a function.

fmap ≡ over mapped
fmapDefault ≡ over traverse
sets . over ≡ id
over . sets ≡ id

Given any valid Setter l, you can also rely on the law:

over l f . over l g = over l (f . g)

e.g.

>>> over mapped f (over mapped g [a,b,c]) == over mapped (f . g) [a,b,c]
True

Another way to view over is to say that it transforms a Setter into a "semantic editor combinator".

>>> over mapped f (Just a)
Just (f a)

>>> over mapped (*10) [1,2,3]
[10,20,30]

>>> over _1 f (a,b)
(f a,b)

>>> over _1 show (10,20)
("10",20)

over :: Setter s t a b -> (a -> b) -> s -> t
over :: ASetter s t a b -> (a -> b) -> s -> t

cloneIndexedSetter :: AnIndexedSetter i s t a b -> IndexedSetter i s t a b #

Clone an IndexedSetter.

cloneIndexPreservingSetter :: ASetter s t a b -> IndexPreservingSetter s t a b #

Build an IndexPreservingSetter from any Setter.

cloneSetter :: ASetter s t a b -> Setter s t a b #

Restore ASetter to a full Setter.

sets :: (Profunctor p, Profunctor q, Settable f) => (p a b -> q s t) -> Optical p q f s t a b #

Build a Setter, IndexedSetter or IndexPreservingSetter depending on your choice of Profunctor.

sets :: ((a -> b) -> s -> t) -> Setter s t a b

setting :: ((a -> b) -> s -> t) -> IndexPreservingSetter s t a b #

Build an index-preserving Setter from a map-like function.

Your supplied function f is required to satisfy:

f id ≡ id
f g . f h ≡ f (g . h)

Equational reasoning:

setting . over ≡ id
over . setting ≡ id

Another way to view sets is that it takes a "semantic editor combinator" and transforms it into a Setter.

setting :: ((a -> b) -> s -> t) -> Setter s t a b

contramapped :: forall (f :: Type -> Type) b a. Contravariant f => Setter (f b) (f a) a b #

This Setter can be used to map over all of the inputs to a Contravariant.

contramap ≡ over contramapped

>>> getPredicate (over contramapped (*2) (Predicate even)) 5
True

>>> getOp (over contramapped (*5) (Op show)) 100
"500"

>>> Prelude.map ($ 1) $ over (mapped . _Unwrapping' Op . contramapped) (*12) [(*2),(+1),(^3)]
[24,13,1728]

lifted :: forall (m :: Type -> Type) a b. Monad m => Setter (m a) (m b) a b #

This setter can be used to modify all of the values in a Monad.

You sometimes have to use this rather than mapped -- due to temporary insanity Functor was not a superclass of Monad until GHC 7.10.

liftM ≡ over lifted

>>> over lifted f [a,b,c]
[f a,f b,f c]

>>> set lifted b (Just a)
Just b

If you want an IndexPreservingSetter use setting liftM.

mapped :: forall (f :: Type -> Type) a b. Functor f => Setter (f a) (f b) a b #

This Setter can be used to map over all of the values in a Functor.

fmap ≡ over mapped
fmapDefault ≡ over traverse
(<$) ≡ set mapped

>>> over mapped f [a,b,c]
[f a,f b,f c]

>>> over mapped (+1) [1,2,3]
[2,3,4]

>>> set mapped x [a,b,c]
[x,x,x]

>>> [[a,b],[c]] & mapped.mapped +~ x
[[a + x,b + x],[c + x]]

>>> over (mapped._2) length [("hello","world"),("leaders","!!!")]
[("hello",5),("leaders",3)]

mapped :: Functor f => Setter (f a) (f b) a b

If you want an IndexPreservingSetter use setting fmap.

type ASetter s t a b = (a -> Identity b) -> s -> Identity t #

Running a Setter instantiates it to a concrete type.

When consuming a setter directly to perform a mapping, you can use this type, but most user code will not need to use this type.

type ASetter' s a = ASetter s s a a #

This is a useful alias for use when consuming a Setter'.

Most user code will never have to use this type.

type ASetter' = Simple ASetter

type AnIndexedSetter i s t a b = Indexed i a (Identity b) -> s -> Identity t #

Running an IndexedSetter instantiates it to a concrete type.

When consuming a setter directly to perform a mapping, you can use this type, but most user code will not need to use this type.

type AnIndexedSetter' i s a = AnIndexedSetter i s s a a #

type AnIndexedSetter' i = Simple (AnIndexedSetter i)

type Setting (p :: Type -> Type -> Type) s t a b = p a (Identity b) -> s -> Identity t #

This is a convenient alias when defining highly polymorphic code that takes both ASetter and AnIndexedSetter as appropriate. If a function takes this it is expecting one of those two things based on context.

type Setting' (p :: Type -> Type -> Type) s a = Setting p s s a a #

This is a convenient alias when defining highly polymorphic code that takes both ASetter' and AnIndexedSetter' as appropriate. If a function takes this it is expecting one of those two things based on context.

type Lens s t a b = forall (f :: Type -> Type). Functor f => (a -> f b) -> s -> f t #

A Lens is actually a lens family as described in http://comonad.com/reader/2012/mirrored-lenses/.

With great power comes great responsibility and a Lens is subject to the three common sense Lens laws:

1) You get back what you put in:

view l (set l v s)  ≡ v

2) Putting back what you got doesn't change anything:

set l (view l s) s  ≡ s

3) Setting twice is the same as setting once:

set l v' (set l v s) ≡ set l v' s

These laws are strong enough that the 4 type parameters of a Lens cannot vary fully independently. For more on how they interact, read the "Why is it a Lens Family?" section of http://comonad.com/reader/2012/mirrored-lenses/.

There are some emergent properties of these laws:

1) set l s must be injective for every s This is a consequence of law #1

2) set l must be surjective, because of law #2, which indicates that it is possible to obtain any v from some s such that set s v = s

3) Given just the first two laws you can prove a weaker form of law #3 where the values v that you are setting match:

set l v (set l v s) ≡ set l v s

Every Lens can be used directly as a Setter or Traversal.

You can also use a Lens for Getting as if it were a Fold or Getter.

Since every Lens is a valid Traversal, the Traversal laws are required of any Lens you create:

l pure ≡ pure
fmap (l f) . l g ≡ getCompose . l (Compose . fmap f . g)

type Lens s t a b = forall f. Functor f => LensLike f s t a b

type Lens' s a = Lens s s a a #

type Lens' = Simple Lens

type IndexedLens i s t a b = forall (f :: Type -> Type) (p :: Type -> Type -> Type). (Indexable i p, Functor f) => p a (f b) -> s -> f t #

Every IndexedLens is a valid Lens and a valid IndexedTraversal.

type IndexedLens' i s a = IndexedLens i s s a a #

type IndexedLens' i = Simple (IndexedLens i)

type IndexPreservingLens s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Functor f) => p a (f b) -> p s (f t) #

An IndexPreservingLens leaves any index it is composed with alone.

type IndexPreservingLens' s a = IndexPreservingLens s s a a #

type IndexPreservingLens' = Simple IndexPreservingLens

type Traversal s t a b = forall (f :: Type -> Type). Applicative f => (a -> f b) -> s -> f t #

A Traversal can be used directly as a Setter or a Fold (but not as a Lens) and provides the ability to both read and update multiple fields, subject to some relatively weak Traversal laws.

These have also been known as multilenses, but they have the signature and spirit of

traverse :: Traversable f => Traversal (f a) (f b) a b

and the more evocative name suggests their application.

Most of the time the Traversal you will want to use is just traverse, but you can also pass any Lens or Iso as a Traversal, and composition of a Traversal (or Lens or Iso) with a Traversal (or Lens or Iso) using (.) forms a valid Traversal.

The laws for a Traversal t follow from the laws for Traversable as stated in "The Essence of the Iterator Pattern".

t pure ≡ pure
fmap (t f) . t g ≡ getCompose . t (Compose . fmap f . g)

One consequence of this requirement is that a Traversal needs to leave the same number of elements as a candidate for subsequent Traversal that it started with. Another testament to the strength of these laws is that the caveat expressed in section 5.5 of the "Essence of the Iterator Pattern" about exotic Traversable instances that traverse the same entry multiple times was actually already ruled out by the second law in that same paper!

type Traversal' s a = Traversal s s a a #

type Traversal' = Simple Traversal

type Traversal1 s t a b = forall (f :: Type -> Type). Apply f => (a -> f b) -> s -> f t #

A Traversal which targets at least one element.

Note that since Apply is not a superclass of Applicative, a Traversal1 cannot always be used in place of a Traversal. In such circumstances cloneTraversal will convert a Traversal1 into a Traversal.

type Traversal1' s a = Traversal1 s s a a #

type IndexedTraversal i s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Indexable i p, Applicative f) => p a (f b) -> s -> f t #

Every IndexedTraversal is a valid Traversal or IndexedFold.

The Indexed constraint is used to allow an IndexedTraversal to be used directly as a Traversal.

The Traversal laws are still required to hold.

In addition, the index i should satisfy the requirement that it stays unchanged even when modifying the value a, otherwise traversals like indices break the Traversal laws.

type IndexedTraversal' i s a = IndexedTraversal i s s a a #

type IndexedTraversal' i = Simple (IndexedTraversal i)

type IndexedTraversal1 i s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Indexable i p, Apply f) => p a (f b) -> s -> f t #

type IndexedTraversal1' i s a = IndexedTraversal1 i s s a a #

type IndexPreservingTraversal s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Applicative f) => p a (f b) -> p s (f t) #

An IndexPreservingLens leaves any index it is composed with alone.

type IndexPreservingTraversal' s a = IndexPreservingTraversal s s a a #

type IndexPreservingTraversal' = Simple IndexPreservingTraversal

type IndexPreservingTraversal1 s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Apply f) => p a (f b) -> p s (f t) #

type IndexPreservingTraversal1' s a = IndexPreservingTraversal1 s s a a #

type Setter s t a b = forall (f :: Type -> Type). Settable f => (a -> f b) -> s -> f t #

The only LensLike law that can apply to a Setter l is that

set l y (set l x a) ≡ set l y a

You can't view a Setter in general, so the other two laws are irrelevant.

However, two Functor laws apply to a Setter:

over l id ≡ id
over l f . over l g ≡ over l (f . g)

These can be stated more directly:

l pure ≡ pure
l f . untainted . l g ≡ l (f . untainted . g)

You can compose a Setter with a Lens or a Traversal using (.) from the Prelude and the result is always only a Setter and nothing more.

>>> over traverse f [a,b,c,d]
[f a,f b,f c,f d]

>>> over _1 f (a,b)
(f a,b)

>>> over (traverse._1) f [(a,b),(c,d)]
[(f a,b),(f c,d)]

>>> over both f (a,b)
(f a,f b)

>>> over (traverse.both) f [(a,b),(c,d)]
[(f a,f b),(f c,f d)]

type Setter' s a = Setter s s a a #

A Setter' is just a Setter that doesn't change the types.

These are particularly common when talking about monomorphic containers. e.g.

sets Data.Text.map :: Setter' Text Char

type Setter' = Simple Setter

type IndexedSetter i s t a b = forall (f :: Type -> Type) (p :: Type -> Type -> Type). (Indexable i p, Settable f) => p a (f b) -> s -> f t #

Every IndexedSetter is a valid Setter.

The Setter laws are still required to hold.

type IndexedSetter' i s a = IndexedSetter i s s a a #

type IndexedSetter' i = Simple (IndexedSetter i)

type IndexPreservingSetter s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Settable f) => p a (f b) -> p s (f t) #

An IndexPreservingSetter can be composed with a IndexedSetter, IndexedTraversal or IndexedLens and leaves the index intact, yielding an IndexedSetter.

type IndexPreservingSetter' s a = IndexPreservingSetter s s a a #

type IndexedPreservingSetter' i = Simple IndexedPreservingSetter

type Iso s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Profunctor p, Functor f) => p a (f b) -> p s (f t) #

Isomorphism families can be composed with another Lens using (.) and id.

Since every Iso is both a valid Lens and a valid Prism, the laws for those types imply the following laws for an Iso f:

f . from f ≡ id
from f . f ≡ id

Note: Composition with an Iso is index- and measure- preserving.

type Iso' s a = Iso s s a a #

type Iso' = Simple Iso

type Review t b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Choice p, Bifunctor p, Settable f) => Optic' p f t b #

This is a limited form of a Prism that can only be used for re operations.

Like with a Getter, there are no laws to state for a Review.

You can generate a Review by using unto. You can also use any Prism or Iso directly as a Review.

type AReview t b = Optic' (Tagged :: Type -> Type -> Type) Identity t b #

If you see this in a signature for a function, the function is expecting a Review (in practice, this usually means a Prism).

type Prism s t a b = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Choice p, Applicative f) => p a (f b) -> p s (f t) #

A Prism l is a Traversal that can also be turned around with re to obtain a Getter in the opposite direction.

There are three laws that a Prism should satisfy:

First, if I re or review a value with a Prism and then preview or use (^?), I will get it back:

preview l (review l b) ≡ Just b

Second, if you can extract a value a using a Prism l from a value s, then the value s is completely described by l and a:

preview l s ≡ Just a ⟹ review l a ≡ s

Third, if you get non-match t, you can convert it result back to s:

matching l s ≡ Left t ⟹ matching l t ≡ Left s

The first two laws imply that the Traversal laws hold for every Prism and that we traverse at most 1 element:

lengthOf l x <= 1

It may help to think of this as an Iso that can be partial in one direction.

Every Prism is a valid Traversal.

Every Iso is a valid Prism.

For example, you might have a Prism' Integer Natural allows you to always go from a Natural to an Integer, and provide you with tools to check if an Integer is a Natural and/or to edit one if it is.

nat :: Prism' Integer Natural
nat = prism toInteger $ \ i ->
   if i < 0
   then Left i
   else Right (fromInteger i)

Now we can ask if an Integer is a Natural.

>>> 5^?nat
Just 5

>>> (-5)^?nat
Nothing

We can update the ones that are:

>>> (-3,4) & both.nat *~ 2
(-3,8)

And we can then convert from a Natural to an Integer.

>>> 5 ^. re nat -- :: Natural
5

Similarly we can use a Prism to traverse the Left half of an Either:

>>> Left "hello" & _Left %~ length
Left 5

or to construct an Either:

>>> 5^.re _Left
Left 5

such that if you query it with the Prism, you will get your original input back.

>>> 5^.re _Left ^? _Left
Just 5

Another interesting way to think of a Prism is as the categorical dual of a Lens -- a co-Lens, so to speak. This is what permits the construction of outside.

Note: Composition with a Prism is index-preserving.

type Prism' s a = Prism s s a a #

A Simple Prism.

type Equality (s :: k1) (t :: k2) (a :: k1) (b :: k2) = forall k3 (p :: k1 -> k3 -> Type) (f :: k2 -> k3). p a (f b) -> p s (f t) #

A witness that (a ~ s, b ~ t).

Note: Composition with an Equality is index-preserving.

type Equality' (s :: k2) (a :: k2) = Equality s s a a #

A Simple Equality.

type As (a :: k2) = Equality' a a #

Composable asTypeOf. Useful for constraining excess polymorphism, foo . (id :: As Int) . bar.

type Getter s a = forall (f :: Type -> Type). (Contravariant f, Functor f) => (a -> f a) -> s -> f s #

A Getter describes how to retrieve a single value in a way that can be composed with other LensLike constructions.

Unlike a Lens a Getter is read-only. Since a Getter cannot be used to write back there are no Lens laws that can be applied to it. In fact, it is isomorphic to an arbitrary function from (s -> a).

Moreover, a Getter can be used directly as a Fold, since it just ignores the Applicative.

type IndexedGetter i s a = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Indexable i p, Contravariant f, Functor f) => p a (f a) -> s -> f s #

Every IndexedGetter is a valid IndexedFold and can be used for Getting like a Getter.

type IndexPreservingGetter s a = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Contravariant f, Functor f) => p a (f a) -> p s (f s) #

An IndexPreservingGetter can be used as a Getter, but when composed with an IndexedTraversal, IndexedFold, or IndexedLens yields an IndexedFold, IndexedFold or IndexedGetter respectively.

type Fold s a = forall (f :: Type -> Type). (Contravariant f, Applicative f) => (a -> f a) -> s -> f s #

A Fold describes how to retrieve multiple values in a way that can be composed with other LensLike constructions.

A Fold s a provides a structure with operations very similar to those of the Foldable typeclass, see foldMapOf and the other Fold combinators.

By convention, if there exists a foo method that expects a Foldable (f a), then there should be a fooOf method that takes a Fold s a and a value of type s.

A Getter is a legal Fold that just ignores the supplied Monoid.

Unlike a Traversal a Fold is read-only. Since a Fold cannot be used to write back there are no Lens laws that apply.

type IndexedFold i s a = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Indexable i p, Contravariant f, Applicative f) => p a (f a) -> s -> f s #

Every IndexedFold is a valid Fold and can be used for Getting.

type IndexPreservingFold s a = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Contravariant f, Applicative f) => p a (f a) -> p s (f s) #

An IndexPreservingFold can be used as a Fold, but when composed with an IndexedTraversal, IndexedFold, or IndexedLens yields an IndexedFold respectively.

type Fold1 s a = forall (f :: Type -> Type). (Contravariant f, Apply f) => (a -> f a) -> s -> f s #

A relevant Fold (aka Fold1) has one or more targets.

type IndexedFold1 i s a = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Indexable i p, Contravariant f, Apply f) => p a (f a) -> s -> f s #

type IndexPreservingFold1 s a = forall (p :: Type -> Type -> Type) (f :: Type -> Type). (Conjoined p, Contravariant f, Apply f) => p a (f a) -> p s (f s) #

type Simple (f :: k1 -> k1 -> k2 -> k2 -> k) (s :: k1) (a :: k2) = f s s a a #

A Simple Lens, Simple Traversal, ... can be used instead of a Lens,Traversal, ... whenever the type variables don't change upon setting a value.

_imagPart :: Simple Lens (Complex a) a
traversed :: Simple (IndexedTraversal Int) [a] a

Note: To use this alias in your own code with LensLike f or Setter, you may have to turn on LiberalTypeSynonyms.

This is commonly abbreviated as a "prime" marker, e.g. Lens' = Simple Lens.

type Optic (p :: k -> k1 -> Type) (f :: k2 -> k1) (s :: k) (t :: k2) (a :: k) (b :: k2) = p a (f b) -> p s (f t) #

A valid Optic l should satisfy the laws:

l pure ≡ pure
l (Procompose f g) = Procompose (l f) (l g)

This gives rise to the laws for Equality, Iso, Prism, Lens, Traversal, Traversal1, Setter, Fold, Fold1, and Getter as well along with their index-preserving variants.

type LensLike f s t a b = Optic (->) f s t a b

type Optic' (p :: k -> k1 -> Type) (f :: k -> k1) (s :: k) (a :: k) = Optic p f s s a a #

type Optic' p f s a = Simple (Optic p f) s a

type Optical (p :: k -> k1 -> Type) (q :: k2 -> k1 -> Type) (f :: k3 -> k1) (s :: k2) (t :: k3) (a :: k) (b :: k3) = p a (f b) -> q s (f t) #

type LensLike f s t a b = Optical (->) (->) f s t a b

type Over p f s t a b = Optical p (->) f s t a b

type Optic p f s t a b = Optical p p f s t a b

type Optical' (p :: k -> k1 -> Type) (q :: k -> k1 -> Type) (f :: k -> k1) (s :: k) (a :: k) = Optical p q f s s a a #

type Optical' p q f s a = Simple (Optical p q f) s a

type LensLike (f :: k -> Type) s (t :: k) a (b :: k) = (a -> f b) -> s -> f t #

Many combinators that accept a Lens can also accept a Traversal in limited situations.

They do so by specializing the type of Functor that they require of the caller.

If a function accepts a LensLike f s t a b for some Functor f, then they may be passed a Lens.

Further, if f is an Applicative, they may also be passed a Traversal.

type LensLike' (f :: Type -> Type) s a = LensLike f s s a a #

type LensLike' f = Simple (LensLike f)

type IndexedLensLike i (f :: k -> Type) s (t :: k) a (b :: k) = forall (p :: Type -> Type -> Type). Indexable i p => p a (f b) -> s -> f t #

Convenient alias for constructing indexed lenses and their ilk.

type IndexedLensLike' i (f :: Type -> Type) s a = IndexedLensLike i f s s a a #

Convenient alias for constructing simple indexed lenses and their ilk.

type Over (p :: k -> Type -> Type) (f :: k1 -> Type) s (t :: k1) (a :: k) (b :: k1) = p a (f b) -> s -> f t #

This is a convenient alias for use when you need to consume either indexed or non-indexed lens-likes based on context.

type Over' (p :: Type -> Type -> Type) (f :: Type -> Type) s a = Over p f s s a a #

This is a convenient alias for use when you need to consume either indexed or non-indexed lens-likes based on context.

type Over' p f = Simple (Over p f)

class (Applicative f, Distributive f, Traversable f) => Settable (f :: Type -> Type) #

Anything Settable must be isomorphic to the Identity Functor.

Minimal complete definition

untainted

Instances

Instances details

Settable Identity	So you can pass our `Setter` into combinators from other lens libraries.
Instance details Defined in Control.Lens.Internal.Setter Methods untainted :: Identity a -> a # untaintedDot :: Profunctor p => p a (Identity b) -> p a b # taintedDot :: Profunctor p => p a b -> p a (Identity b) #
Settable f => Settable (Backwards f)	`backwards`
Instance details Defined in Control.Lens.Internal.Setter Methods untainted :: Backwards f a -> a # untaintedDot :: Profunctor p => p a (Backwards f b) -> p a b # taintedDot :: Profunctor p => p a b -> p a (Backwards f b) #
(Settable f, Settable g) => Settable (Compose f g)
Instance details Defined in Control.Lens.Internal.Setter Methods untainted :: Compose f g a -> a # untaintedDot :: Profunctor p => p a (Compose f g b) -> p a b # taintedDot :: Profunctor p => p a b -> p a (Compose f g b) #

retagged :: (Profunctor p, Bifunctor p) => p a b -> p s b #

This is a profunctor used internally to implement Review

It plays a role similar to that of Accessor or Const do for Control.Lens.Getter

class (Profunctor p, Bifunctor p) => Reviewable (p :: Type -> Type -> Type) #

This class is provided mostly for backwards compatibility with lens 3.8, but it can also shorten type signatures.

Instances

Instances details

(Profunctor p, Bifunctor p) => Reviewable p
Instance details Defined in Control.Lens.Internal.Review

data Magma i t b a #

This provides a way to peek at the internal structure of a Traversal or IndexedTraversal

Instances

Instances details

FoldableWithIndex i (Magma i t b)
Instance details Defined in Control.Lens.Internal.Magma Methods ifoldMap :: Monoid m => (i -> a -> m) -> Magma i t b a -> m # ifoldMap' :: Monoid m => (i -> a -> m) -> Magma i t b a -> m # ifoldr :: (i -> a -> b0 -> b0) -> b0 -> Magma i t b a -> b0 # ifoldl :: (i -> b0 -> a -> b0) -> b0 -> Magma i t b a -> b0 # ifoldr' :: (i -> a -> b0 -> b0) -> b0 -> Magma i t b a -> b0 # ifoldl' :: (i -> b0 -> a -> b0) -> b0 -> Magma i t b a -> b0 #
FunctorWithIndex i (Magma i t b)
Instance details Defined in Control.Lens.Internal.Magma Methods imap :: (i -> a -> b0) -> Magma i t b a -> Magma i t b b0 #
TraversableWithIndex i (Magma i t b)
Instance details Defined in Control.Lens.Internal.Magma Methods itraverse :: Applicative f => (i -> a -> f b0) -> Magma i t b a -> f (Magma i t b b0) #
Foldable (Magma i t b)
Instance details Defined in Control.Lens.Internal.Magma Methods fold :: Monoid m => Magma i t b m -> m # foldMap :: Monoid m => (a -> m) -> Magma i t b a -> m # foldMap' :: Monoid m => (a -> m) -> Magma i t b a -> m # foldr :: (a -> b0 -> b0) -> b0 -> Magma i t b a -> b0 # foldr' :: (a -> b0 -> b0) -> b0 -> Magma i t b a -> b0 # foldl :: (b0 -> a -> b0) -> b0 -> Magma i t b a -> b0 # foldl' :: (b0 -> a -> b0) -> b0 -> Magma i t b a -> b0 # foldr1 :: (a -> a -> a) -> Magma i t b a -> a # foldl1 :: (a -> a -> a) -> Magma i t b a -> a # toList :: Magma i t b a -> [a] # null :: Magma i t b a -> Bool # length :: Magma i t b a -> Int # elem :: Eq a => a -> Magma i t b a -> Bool # maximum :: Ord a => Magma i t b a -> a # minimum :: Ord a => Magma i t b a -> a # sum :: Num a => Magma i t b a -> a # product :: Num a => Magma i t b a -> a #
Traversable (Magma i t b)
Instance details Defined in Control.Lens.Internal.Magma Methods traverse :: Applicative f => (a -> f b0) -> Magma i t b a -> f (Magma i t b b0) # sequenceA :: Applicative f => Magma i t b (f a) -> f (Magma i t b a) # mapM :: Monad m => (a -> m b0) -> Magma i t b a -> m (Magma i t b b0) # sequence :: Monad m => Magma i t b (m a) -> m (Magma i t b a) #
Functor (Magma i t b)
Instance details Defined in Control.Lens.Internal.Magma Methods fmap :: (a -> b0) -> Magma i t b a -> Magma i t b b0 # (<$) :: a -> Magma i t b b0 -> Magma i t b a #
(Show i, Show a) => Show (Magma i t b a)
Instance details Defined in Control.Lens.Internal.Magma Methods showsPrec :: Int -> Magma i t b a -> ShowS # show :: Magma i t b a -> String # showList :: [Magma i t b a] -> ShowS #

newtype Bazaar (p :: Type -> Type -> Type) a b t #

This is used to characterize a Traversal.

a.k.a. indexed Cartesian store comonad, indexed Kleene store comonad, or an indexed FunList.

http://twanvl.nl/blog/haskell/non-regular1

A Bazaar is like a Traversal that has already been applied to some structure.

Where a Context a b t holds an a and a function from b to t, a Bazaar a b t holds N as and a function from N bs to t, (where N might be infinite).

Mnemonically, a Bazaar holds many stores and you can easily add more.

This is a final encoding of Bazaar.

Constructors

Bazaar
Fields runBazaar :: forall (f :: Type -> Type). Applicative f => p a (f b) -> f t

Instances

Instances details

Profunctor p => Bizarre p (Bazaar p)
Instance details Defined in Control.Lens.Internal.Bazaar Methods bazaar :: Applicative f => p a (f b) -> Bazaar p a b t -> f t #
Corepresentable p => Sellable p (Bazaar p)
Instance details Defined in Control.Lens.Internal.Bazaar Methods sell :: p a (Bazaar p a b b) #
Conjoined p => IndexedComonad (Bazaar p)
Instance details Defined in Control.Lens.Internal.Bazaar Methods iextract :: Bazaar p a a t -> t # iduplicate :: Bazaar p a c t -> Bazaar p a b (Bazaar p b c t) # iextend :: (Bazaar p b c t -> r) -> Bazaar p a c t -> Bazaar p a b r #
IndexedFunctor (Bazaar p)
Instance details Defined in Control.Lens.Internal.Bazaar Methods ifmap :: (s -> t) -> Bazaar p a b s -> Bazaar p a b t #
Applicative (Bazaar p a b)
Instance details Defined in Control.Lens.Internal.Bazaar Methods pure :: a0 -> Bazaar p a b a0 # (<>) :: Bazaar p a b (a0 -> b0) -> Bazaar p a b a0 -> Bazaar p a b b0 # liftA2 :: (a0 -> b0 -> c) -> Bazaar p a b a0 -> Bazaar p a b b0 -> Bazaar p a b c # (>) :: Bazaar p a b a0 -> Bazaar p a b b0 -> Bazaar p a b b0 # (<*) :: Bazaar p a b a0 -> Bazaar p a b b0 -> Bazaar p a b a0 #
Functor (Bazaar p a b)
Instance details Defined in Control.Lens.Internal.Bazaar Methods fmap :: (a0 -> b0) -> Bazaar p a b a0 -> Bazaar p a b b0 # (<$) :: a0 -> Bazaar p a b b0 -> Bazaar p a b a0 #
(a ~ b, Conjoined p) => Comonad (Bazaar p a b)
Instance details Defined in Control.Lens.Internal.Bazaar Methods extract :: Bazaar p a b a0 -> a0 # duplicate :: Bazaar p a b a0 -> Bazaar p a b (Bazaar p a b a0) # extend :: (Bazaar p a b a0 -> b0) -> Bazaar p a b a0 -> Bazaar p a b b0 #
(a ~ b, Conjoined p) => ComonadApply (Bazaar p a b)
Instance details Defined in Control.Lens.Internal.Bazaar Methods (<@>) :: Bazaar p a b (a0 -> b0) -> Bazaar p a b a0 -> Bazaar p a b b0 # (@>) :: Bazaar p a b a0 -> Bazaar p a b b0 -> Bazaar p a b b0 # (<@) :: Bazaar p a b a0 -> Bazaar p a b b0 -> Bazaar p a b a0 #
Apply (Bazaar p a b)
Instance details Defined in Control.Lens.Internal.Bazaar Methods (<.>) :: Bazaar p a b (a0 -> b0) -> Bazaar p a b a0 -> Bazaar p a b b0 # (.>) :: Bazaar p a b a0 -> Bazaar p a b b0 -> Bazaar p a b b0 # (<.) :: Bazaar p a b a0 -> Bazaar p a b b0 -> Bazaar p a b a0 # liftF2 :: (a0 -> b0 -> c) -> Bazaar p a b a0 -> Bazaar p a b b0 -> Bazaar p a b c #

type Bazaar' (p :: Type -> Type -> Type) a = Bazaar p a a #

This alias is helpful when it comes to reducing repetition in type signatures.

type Bazaar' p a t = Bazaar p a a t

newtype Bazaar1 (p :: Type -> Type -> Type) a b t #

This is used to characterize a Traversal.

a.k.a. indexed Cartesian store comonad, indexed Kleene store comonad, or an indexed FunList.

http://twanvl.nl/blog/haskell/non-regular1

A Bazaar1 is like a Traversal that has already been applied to some structure.

Where a Context a b t holds an a and a function from b to t, a Bazaar1 a b t holds N as and a function from N bs to t, (where N might be infinite).

Mnemonically, a Bazaar1 holds many stores and you can easily add more.

This is a final encoding of Bazaar1.

Constructors

Bazaar1
Fields runBazaar1 :: forall (f :: Type -> Type). Apply f => p a (f b) -> f t

Instances

Instances details

Profunctor p => Bizarre1 p (Bazaar1 p)
Instance details Defined in Control.Lens.Internal.Bazaar Methods bazaar1 :: Apply f => p a (f b) -> Bazaar1 p a b t -> f t #
Corepresentable p => Sellable p (Bazaar1 p)
Instance details Defined in Control.Lens.Internal.Bazaar Methods sell :: p a (Bazaar1 p a b b) #
Conjoined p => IndexedComonad (Bazaar1 p)
Instance details Defined in Control.Lens.Internal.Bazaar Methods iextract :: Bazaar1 p a a t -> t # iduplicate :: Bazaar1 p a c t -> Bazaar1 p a b (Bazaar1 p b c t) # iextend :: (Bazaar1 p b c t -> r) -> Bazaar1 p a c t -> Bazaar1 p a b r #
IndexedFunctor (Bazaar1 p)
Instance details Defined in Control.Lens.Internal.Bazaar Methods ifmap :: (s -> t) -> Bazaar1 p a b s -> Bazaar1 p a b t #
Functor (Bazaar1 p a b)
Instance details Defined in Control.Lens.Internal.Bazaar Methods fmap :: (a0 -> b0) -> Bazaar1 p a b a0 -> Bazaar1 p a b b0 # (<$) :: a0 -> Bazaar1 p a b b0 -> Bazaar1 p a b a0 #
(a ~ b, Conjoined p) => Comonad (Bazaar1 p a b)
Instance details Defined in Control.Lens.Internal.Bazaar Methods extract :: Bazaar1 p a b a0 -> a0 # duplicate :: Bazaar1 p a b a0 -> Bazaar1 p a b (Bazaar1 p a b a0) # extend :: (Bazaar1 p a b a0 -> b0) -> Bazaar1 p a b a0 -> Bazaar1 p a b b0 #
(a ~ b, Conjoined p) => ComonadApply (Bazaar1 p a b)
Instance details Defined in Control.Lens.Internal.Bazaar Methods (<@>) :: Bazaar1 p a b (a0 -> b0) -> Bazaar1 p a b a0 -> Bazaar1 p a b b0 # (@>) :: Bazaar1 p a b a0 -> Bazaar1 p a b b0 -> Bazaar1 p a b b0 # (<@) :: Bazaar1 p a b a0 -> Bazaar1 p a b b0 -> Bazaar1 p a b a0 #
Apply (Bazaar1 p a b)
Instance details Defined in Control.Lens.Internal.Bazaar Methods (<.>) :: Bazaar1 p a b (a0 -> b0) -> Bazaar1 p a b a0 -> Bazaar1 p a b b0 # (.>) :: Bazaar1 p a b a0 -> Bazaar1 p a b b0 -> Bazaar1 p a b b0 # (<.) :: Bazaar1 p a b a0 -> Bazaar1 p a b b0 -> Bazaar1 p a b a0 # liftF2 :: (a0 -> b0 -> c) -> Bazaar1 p a b a0 -> Bazaar1 p a b b0 -> Bazaar1 p a b c #

type Bazaar1' (p :: Type -> Type -> Type) a = Bazaar1 p a a #

This alias is helpful when it comes to reducing repetition in type signatures.

type Bazaar1' p a t = Bazaar1 p a a t

data Context a b t #

The indexed store can be used to characterize a Lens and is used by cloneLens.

Context a b t is isomorphic to newtype Context a b t = Context { runContext :: forall f. Functor f => (a -> f b) -> f t }, and to exists s. (s, Lens s t a b).

A Context is like a Lens that has already been applied to a some structure.

Constructors

Context (b -> t) a

Instances

Instances details

IndexedComonad Context
Instance details Defined in Control.Lens.Internal.Context Methods iextract :: Context a a t -> t # iduplicate :: Context a c t -> Context a b (Context b c t) # iextend :: (Context b c t -> r) -> Context a c t -> Context a b r #
IndexedComonadStore Context
Instance details Defined in Control.Lens.Internal.Context Methods ipos :: Context a c t -> a # ipeek :: c -> Context a c t -> t # ipeeks :: (a -> c) -> Context a c t -> t # iseek :: b -> Context a c t -> Context b c t # iseeks :: (a -> b) -> Context a c t -> Context b c t # iexperiment :: Functor f => (b -> f c) -> Context b c t -> f t # context :: Context a b t -> Context a b t #
IndexedFunctor Context
Instance details Defined in Control.Lens.Internal.Context Methods ifmap :: (s -> t) -> Context a b s -> Context a b t #
a ~ b => ComonadStore a (Context a b)
Instance details Defined in Control.Lens.Internal.Context Methods pos :: Context a b a0 -> a # peek :: a -> Context a b a0 -> a0 # peeks :: (a -> a) -> Context a b a0 -> a0 # seek :: a -> Context a b a0 -> Context a b a0 # seeks :: (a -> a) -> Context a b a0 -> Context a b a0 # experiment :: Functor f => (a -> f a) -> Context a b a0 -> f a0 #
Functor (Context a b)
Instance details Defined in Control.Lens.Internal.Context Methods fmap :: (a0 -> b0) -> Context a b a0 -> Context a b b0 # (<$) :: a0 -> Context a b b0 -> Context a b a0 #
a ~ b => Comonad (Context a b)
Instance details Defined in Control.Lens.Internal.Context Methods extract :: Context a b a0 -> a0 # duplicate :: Context a b a0 -> Context a b (Context a b a0) # extend :: (Context a b a0 -> b0) -> Context a b a0 -> Context a b b0 #
Sellable (->) Context
Instance details Defined in Control.Lens.Internal.Context Methods sell :: a -> Context a b b #

type Context' a = Context a a #

type Context' a s = Context a a s

data Traversed a (f :: Type -> Type) #

Used internally by traverseOf_ and the like.

The argument a of the result should not be used!

Instances

Instances details

Applicative f => Monoid (Traversed a f)
Instance details Defined in Control.Lens.Internal.Fold Methods mempty :: Traversed a f # mappend :: Traversed a f -> Traversed a f -> Traversed a f # mconcat :: [Traversed a f] -> Traversed a f #
Applicative f => Semigroup (Traversed a f)
Instance details Defined in Control.Lens.Internal.Fold Methods (<>) :: Traversed a f -> Traversed a f -> Traversed a f # sconcat :: NonEmpty (Traversed a f) -> Traversed a f # stimes :: Integral b => b -> Traversed a f -> Traversed a f #

data Sequenced a (m :: Type -> Type) #

Used internally by mapM_ and the like.

The argument a of the result should not be used!

See 4.16 Changelog entry for the explanation of "why not Apply f =>"?

Instances

Instances details

Monad m => Monoid (Sequenced a m)
Instance details Defined in Control.Lens.Internal.Fold Methods mempty :: Sequenced a m # mappend :: Sequenced a m -> Sequenced a m -> Sequenced a m # mconcat :: [Sequenced a m] -> Sequenced a m #
Monad m => Semigroup (Sequenced a m)
Instance details Defined in Control.Lens.Internal.Fold Methods (<>) :: Sequenced a m -> Sequenced a m -> Sequenced a m # sconcat :: NonEmpty (Sequenced a m) -> Sequenced a m # stimes :: Integral b => b -> Sequenced a m -> Sequenced a m #

data Leftmost a #

Used for firstOf.

Instances

Instances details

Monoid (Leftmost a)
Instance details Defined in Control.Lens.Internal.Fold Methods mempty :: Leftmost a # mappend :: Leftmost a -> Leftmost a -> Leftmost a # mconcat :: [Leftmost a] -> Leftmost a #
Semigroup (Leftmost a)
Instance details Defined in Control.Lens.Internal.Fold Methods (<>) :: Leftmost a -> Leftmost a -> Leftmost a # sconcat :: NonEmpty (Leftmost a) -> Leftmost a # stimes :: Integral b => b -> Leftmost a -> Leftmost a #

data Rightmost a #

Used for lastOf.

Instances

Instances details

Monoid (Rightmost a)
Instance details Defined in Control.Lens.Internal.Fold Methods mempty :: Rightmost a # mappend :: Rightmost a -> Rightmost a -> Rightmost a # mconcat :: [Rightmost a] -> Rightmost a #
Semigroup (Rightmost a)
Instance details Defined in Control.Lens.Internal.Fold Methods (<>) :: Rightmost a -> Rightmost a -> Rightmost a # sconcat :: NonEmpty (Rightmost a) -> Rightmost a # stimes :: Integral b => b -> Rightmost a -> Rightmost a #

asIndex :: (Indexable i p, Contravariant f, Functor f) => p i (f i) -> Indexed i s (f s) #

When composed with an IndexedFold or IndexedTraversal this yields an (Indexed) Fold of the indices.

withIndex :: (Indexable i p, Functor f) => p (i, s) (f (j, t)) -> Indexed i s (f t) #

Fold a container with indices returning both the indices and the values.

The result is only valid to compose in a Traversal, if you don't edit the index as edits to the index have no effect.

>>> [10, 20, 30] ^.. ifolded . withIndex
[(0,10),(1,20),(2,30)]

>>> [10, 20, 30] ^.. ifolded . withIndex . alongside negated (re _Show)
[(0,"10"),(-1,"20"),(-2,"30")]

indexing64 :: Indexable Int64 p => ((a -> Indexing64 f b) -> s -> Indexing64 f t) -> p a (f b) -> s -> f t #

Transform a Traversal into an IndexedTraversal or a Fold into an IndexedFold, etc.

This combinator is like indexing except that it handles large traversals and folds gracefully.

indexing64 :: Traversal s t a b -> IndexedTraversal Int64 s t a b
indexing64 :: Prism s t a b     -> IndexedTraversal Int64 s t a b
indexing64 :: Lens s t a b      -> IndexedLens Int64 s t a b
indexing64 :: Iso s t a b       -> IndexedLens Int64 s t a b
indexing64 :: Fold s a          -> IndexedFold Int64 s a
indexing64 :: Getter s a        -> IndexedGetter Int64 s a

indexing64 :: Indexable Int64 p => LensLike (Indexing64 f) s t a b -> Over p f s t a b

indexing :: Indexable Int p => ((a -> Indexing f b) -> s -> Indexing f t) -> p a (f b) -> s -> f t #

Transform a Traversal into an IndexedTraversal or a Fold into an IndexedFold, etc.

indexing :: Traversal s t a b -> IndexedTraversal Int s t a b
indexing :: Prism s t a b     -> IndexedTraversal Int s t a b
indexing :: Lens s t a b      -> IndexedLens Int  s t a b
indexing :: Iso s t a b       -> IndexedLens Int s t a b
indexing :: Fold s a          -> IndexedFold Int s a
indexing :: Getter s a        -> IndexedGetter Int s a

indexing :: Indexable Int p => LensLike (Indexing f) s t a b -> Over p f s t a b

class (Choice p, Corepresentable p, Comonad (Corep p), Traversable (Corep p), Strong p, Representable p, Monad (Rep p), MonadFix (Rep p), Distributive (Rep p), Costrong p, ArrowLoop p, ArrowApply p, ArrowChoice p, Closed p) => Conjoined (p :: Type -> Type -> Type) where #

This is a Profunctor that is both Corepresentable by f and Representable by g such that f is left adjoint to g. From this you can derive a lot of structure due to the preservation of limits and colimits.

Minimal complete definition

Nothing

Methods

distrib :: Functor f => p a b -> p (f a) (f b) #

Conjoined is strong enough to let us distribute every Conjoined Profunctor over every Haskell Functor. This is effectively a generalization of fmap.

conjoined :: (p ~ (->) => q (a -> b) r) -> q (p a b) r -> q (p a b) r #

This permits us to make a decision at an outermost point about whether or not we use an index.

Ideally any use of this function should be done in such a way so that you compute the same answer, but this cannot be enforced at the type level.

Instances

Instances details

Conjoined ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods distrib :: Functor f => ReifiedGetter a b -> ReifiedGetter (f a) (f b) # conjoined :: (ReifiedGetter ~ (->) => q (a -> b) r) -> q (ReifiedGetter a b) r -> q (ReifiedGetter a b) r #
Conjoined (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Methods distrib :: Functor f => Indexed i a b -> Indexed i (f a) (f b) # conjoined :: (Indexed i ~ (->) => q (a -> b) r) -> q (Indexed i a b) r -> q (Indexed i a b) r #
Conjoined (->)
Instance details Defined in Control.Lens.Internal.Indexed Methods distrib :: Functor f => (a -> b) -> f a -> f b # conjoined :: ((->) ~ (->) => q (a -> b) r) -> q (a -> b) r -> q (a -> b) r #

class Conjoined p => Indexable i (p :: Type -> Type -> Type) #

This class permits overloading of function application for things that also admit a notion of a key or index.

Minimal complete definition

indexed

Instances

Instances details

i ~ j => Indexable i (Indexed j)
Instance details Defined in Control.Lens.Internal.Indexed Methods indexed :: Indexed j a b -> i -> a -> b #
Indexable i (->)
Instance details Defined in Control.Lens.Internal.Indexed Methods indexed :: (a -> b) -> i -> a -> b #

newtype Indexed i a b #

A function with access to a index. This constructor may be useful when you need to store an Indexable in a container to avoid ImpredicativeTypes.

index :: Indexed i a b -> i -> a -> b

Constructors

Indexed
Fields runIndexed :: i -> a -> b

Instances

Instances details

Category (Indexed i :: Type -> Type -> TYPE LiftedRep)
Instance details Defined in Control.Lens.Internal.Indexed Methods id :: forall (a :: k). Indexed i a a # (.) :: forall (b :: k) (c :: k) (a :: k). Indexed i b c -> Indexed i a b -> Indexed i a c #
i ~ j => Indexable i (Indexed j)
Instance details Defined in Control.Lens.Internal.Indexed Methods indexed :: Indexed j a b -> i -> a -> b #
Arrow (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Methods arr :: (b -> c) -> Indexed i b c # first :: Indexed i b c -> Indexed i (b, d) (c, d) # second :: Indexed i b c -> Indexed i (d, b) (d, c) # (***) :: Indexed i b c -> Indexed i b' c' -> Indexed i (b, b') (c, c') # (&&&) :: Indexed i b c -> Indexed i b c' -> Indexed i b (c, c') #
ArrowApply (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Methods app :: Indexed i (Indexed i b c, b) c #
ArrowChoice (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Methods left :: Indexed i b c -> Indexed i (Either b d) (Either c d) # right :: Indexed i b c -> Indexed i (Either d b) (Either d c) # (+++) :: Indexed i b c -> Indexed i b' c' -> Indexed i (Either b b') (Either c c') # (\|\|\|) :: Indexed i b d -> Indexed i c d -> Indexed i (Either b c) d #
ArrowLoop (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Methods loop :: Indexed i (b, d) (c, d) -> Indexed i b c #
Conjoined (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Methods distrib :: Functor f => Indexed i a b -> Indexed i (f a) (f b) # conjoined :: (Indexed i ~ (->) => q (a -> b) r) -> q (Indexed i a b) r -> q (Indexed i a b) r #
Choice (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Methods left' :: Indexed i a b -> Indexed i (Either a c) (Either b c) # right' :: Indexed i a b -> Indexed i (Either c a) (Either c b) #
Closed (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Methods closed :: Indexed i a b -> Indexed i (x -> a) (x -> b) #
Corepresentable (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Associated Types type Corep (Indexed i) :: Type -> Type # Methods cotabulate :: (Corep (Indexed i) d -> c) -> Indexed i d c #
Representable (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Associated Types type Rep (Indexed i) :: Type -> Type # Methods tabulate :: (d -> Rep (Indexed i) c) -> Indexed i d c #
Costrong (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Methods unfirst :: Indexed i (a, d) (b, d) -> Indexed i a b # unsecond :: Indexed i (d, a) (d, b) -> Indexed i a b #
Strong (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Methods first' :: Indexed i a b -> Indexed i (a, c) (b, c) # second' :: Indexed i a b -> Indexed i (c, a) (c, b) #
Profunctor (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Methods dimap :: (a -> b) -> (c -> d) -> Indexed i b c -> Indexed i a d # lmap :: (a -> b) -> Indexed i b c -> Indexed i a c # rmap :: (b -> c) -> Indexed i a b -> Indexed i a c # (#.) :: forall a b c q. Coercible c b => q b c -> Indexed i a b -> Indexed i a c # (.#) :: forall a b c q. Coercible b a => Indexed i b c -> q a b -> Indexed i a c #
Bizarre (Indexed Int) Mafic
Instance details Defined in Control.Lens.Internal.Magma Methods bazaar :: Applicative f => Indexed Int a (f b) -> Mafic a b t -> f t #
Bizarre (Indexed i) (Molten i)
Instance details Defined in Control.Lens.Internal.Magma Methods bazaar :: Applicative f => Indexed i a (f b) -> Molten i a b t -> f t #
Sellable (Indexed i) (Molten i)
Instance details Defined in Control.Lens.Internal.Magma Methods sell :: Indexed i a (Molten i a b b) #
Cosieve (Indexed i) ((,) i)
Instance details Defined in Control.Lens.Internal.Indexed Methods cosieve :: Indexed i a b -> (i, a) -> b #
Sieve (Indexed i) ((->) i)
Instance details Defined in Control.Lens.Internal.Indexed Methods sieve :: Indexed i a b -> a -> i -> b #
MonadFix (Indexed i a)
Instance details Defined in Control.Lens.Internal.Indexed Methods mfix :: (a0 -> Indexed i a a0) -> Indexed i a a0 #
Applicative (Indexed i a)
Instance details Defined in Control.Lens.Internal.Indexed Methods pure :: a0 -> Indexed i a a0 # (<>) :: Indexed i a (a0 -> b) -> Indexed i a a0 -> Indexed i a b # liftA2 :: (a0 -> b -> c) -> Indexed i a a0 -> Indexed i a b -> Indexed i a c # (>) :: Indexed i a a0 -> Indexed i a b -> Indexed i a b # (<*) :: Indexed i a a0 -> Indexed i a b -> Indexed i a a0 #
Functor (Indexed i a)
Instance details Defined in Control.Lens.Internal.Indexed Methods fmap :: (a0 -> b) -> Indexed i a a0 -> Indexed i a b # (<$) :: a0 -> Indexed i a b -> Indexed i a a0 #
Monad (Indexed i a)
Instance details Defined in Control.Lens.Internal.Indexed Methods (>>=) :: Indexed i a a0 -> (a0 -> Indexed i a b) -> Indexed i a b # (>>) :: Indexed i a a0 -> Indexed i a b -> Indexed i a b # return :: a0 -> Indexed i a a0 #
Apply (Indexed i a)
Instance details Defined in Control.Lens.Internal.Indexed Methods (<.>) :: Indexed i a (a0 -> b) -> Indexed i a a0 -> Indexed i a b # (.>) :: Indexed i a a0 -> Indexed i a b -> Indexed i a b # (<.) :: Indexed i a a0 -> Indexed i a b -> Indexed i a a0 # liftF2 :: (a0 -> b -> c) -> Indexed i a a0 -> Indexed i a b -> Indexed i a c #
Bind (Indexed i a)
Instance details Defined in Control.Lens.Internal.Indexed Methods (>>-) :: Indexed i a a0 -> (a0 -> Indexed i a b) -> Indexed i a b # join :: Indexed i a (Indexed i a a0) -> Indexed i a a0 #
type Corep (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed type Corep (Indexed i) = (,) i
type Rep (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed type Rep (Indexed i) = (->) i

data Level i a #

This data type represents a path-compressed copy of one level of a source data structure. We can safely use path-compression because we know the depth of the tree.

Path compression is performed by viewing a Level as a PATRICIA trie of the paths into the structure to leaves at a given depth, similar in many ways to a IntMap, but unlike a regular PATRICIA trie we do not need to store the mask bits merely the depth of the fork.

One invariant of this structure is that underneath a Two node you will not find any Zero nodes, so Zero can only occur at the root.

Instances

Instances details

FoldableWithIndex i (Level i)
Instance details Defined in Control.Lens.Internal.Level Methods ifoldMap :: Monoid m => (i -> a -> m) -> Level i a -> m # ifoldMap' :: Monoid m => (i -> a -> m) -> Level i a -> m # ifoldr :: (i -> a -> b -> b) -> b -> Level i a -> b # ifoldl :: (i -> b -> a -> b) -> b -> Level i a -> b # ifoldr' :: (i -> a -> b -> b) -> b -> Level i a -> b # ifoldl' :: (i -> b -> a -> b) -> b -> Level i a -> b #
FunctorWithIndex i (Level i)
Instance details Defined in Control.Lens.Internal.Level Methods imap :: (i -> a -> b) -> Level i a -> Level i b #
TraversableWithIndex i (Level i)
Instance details Defined in Control.Lens.Internal.Level Methods itraverse :: Applicative f => (i -> a -> f b) -> Level i a -> f (Level i b) #
Foldable (Level i)
Instance details Defined in Control.Lens.Internal.Level Methods fold :: Monoid m => Level i m -> m # foldMap :: Monoid m => (a -> m) -> Level i a -> m # foldMap' :: Monoid m => (a -> m) -> Level i a -> m # foldr :: (a -> b -> b) -> b -> Level i a -> b # foldr' :: (a -> b -> b) -> b -> Level i a -> b # foldl :: (b -> a -> b) -> b -> Level i a -> b # foldl' :: (b -> a -> b) -> b -> Level i a -> b # foldr1 :: (a -> a -> a) -> Level i a -> a # foldl1 :: (a -> a -> a) -> Level i a -> a # toList :: Level i a -> [a] # null :: Level i a -> Bool # length :: Level i a -> Int # elem :: Eq a => a -> Level i a -> Bool # maximum :: Ord a => Level i a -> a # minimum :: Ord a => Level i a -> a # sum :: Num a => Level i a -> a # product :: Num a => Level i a -> a #
Traversable (Level i)
Instance details Defined in Control.Lens.Internal.Level Methods traverse :: Applicative f => (a -> f b) -> Level i a -> f (Level i b) # sequenceA :: Applicative f => Level i (f a) -> f (Level i a) # mapM :: Monad m => (a -> m b) -> Level i a -> m (Level i b) # sequence :: Monad m => Level i (m a) -> m (Level i a) #
Functor (Level i)
Instance details Defined in Control.Lens.Internal.Level Methods fmap :: (a -> b) -> Level i a -> Level i b # (<$) :: a -> Level i b -> Level i a #
(Read i, Read a) => Read (Level i a)
Instance details Defined in Control.Lens.Internal.Level Methods readsPrec :: Int -> ReadS (Level i a) # readList :: ReadS [Level i a] # readPrec :: ReadPrec (Level i a) # readListPrec :: ReadPrec [Level i a] #
(Show i, Show a) => Show (Level i a)
Instance details Defined in Control.Lens.Internal.Level Methods showsPrec :: Int -> Level i a -> ShowS # show :: Level i a -> String # showList :: [Level i a] -> ShowS #
(Eq i, Eq a) => Eq (Level i a)
Instance details Defined in Control.Lens.Internal.Level Methods (==) :: Level i a -> Level i a -> Bool # (/=) :: Level i a -> Level i a -> Bool #
(Ord i, Ord a) => Ord (Level i a)
Instance details Defined in Control.Lens.Internal.Level Methods compare :: Level i a -> Level i a -> Ordering # (<) :: Level i a -> Level i a -> Bool # (<=) :: Level i a -> Level i a -> Bool # (>) :: Level i a -> Level i a -> Bool # (>=) :: Level i a -> Level i a -> Bool # max :: Level i a -> Level i a -> Level i a # min :: Level i a -> Level i a -> Level i a #

class Reversing t where #

This class provides a generalized notion of list reversal extended to other containers.

Methods

reversing :: t -> t #

Instances

Instances details

Reversing ByteString
Instance details Defined in Control.Lens.Internal.Iso Methods reversing :: ByteString -> ByteString #
Reversing ByteString
Instance details Defined in Control.Lens.Internal.Iso Methods reversing :: ByteString -> ByteString #
Reversing Text
Instance details Defined in Control.Lens.Internal.Iso Methods reversing :: Text -> Text #
Reversing Text
Instance details Defined in Control.Lens.Internal.Iso Methods reversing :: Text -> Text #
Reversing (Seq a)
Instance details Defined in Control.Lens.Internal.Iso Methods reversing :: Seq a -> Seq a #
(Metric v, OrderedField n) => Reversing (Located (Trail v n)) Source #	Same as `reverseLocTrail`.
Instance details Defined in Diagrams.Trail Methods reversing :: Located (Trail v n) -> Located (Trail v n) #
(Metric v, OrderedField n) => Reversing (Located (Trail' l v n)) Source #	Same as `reverseLocLine` or `reverseLocLoop`.
Instance details Defined in Diagrams.Trail Methods reversing :: Located (Trail' l v n) -> Located (Trail' l v n) #
Reversing (Vector a)
Instance details Defined in Control.Lens.Internal.Iso Methods reversing :: Vector a -> Vector a #
Prim a => Reversing (Vector a)
Instance details Defined in Control.Lens.Internal.Iso Methods reversing :: Vector a -> Vector a #
Storable a => Reversing (Vector a)
Instance details Defined in Control.Lens.Internal.Iso Methods reversing :: Vector a -> Vector a #
Unbox a => Reversing (Vector a)
Instance details Defined in Control.Lens.Internal.Iso Methods reversing :: Vector a -> Vector a #
Reversing (NonEmpty a)
Instance details Defined in Control.Lens.Internal.Iso Methods reversing :: NonEmpty a -> NonEmpty a #
Reversing [a]
Instance details Defined in Control.Lens.Internal.Iso Methods reversing :: [a] -> [a] #
(Metric v, OrderedField n) => Reversing (Path v n) Source #	Same as `reversePath`.
Instance details Defined in Diagrams.Path Methods reversing :: Path v n -> Path v n #
Reversing (FixedSegment v n) Source #	Reverses the control points.
Instance details Defined in Diagrams.Segment Methods reversing :: FixedSegment v n -> FixedSegment v n #
(Metric v, OrderedField n) => Reversing (Trail v n) Source #	Same as `reverseTrail`.
Instance details Defined in Diagrams.Trail Methods reversing :: Trail v n -> Trail v n #
(Additive v, Num n) => Reversing (Offset c v n) Source #	Reverses the direction of closed offsets.
Instance details Defined in Diagrams.Segment Methods reversing :: Offset c v n -> Offset c v n #
(Additive v, Num n) => Reversing (Segment Closed v n) Source #	Reverse the direction of a segment.
Instance details Defined in Diagrams.Segment Methods reversing :: Segment Closed v n -> Segment Closed v n #
(Metric v, OrderedField n) => Reversing (Trail' l v n) Source #	Same as `reverseLine` or `reverseLoop`.
Instance details Defined in Diagrams.Trail Methods reversing :: Trail' l v n -> Trail' l v n #

class (Foldable1 t, Traversable t) => Traversable1 (t :: TYPE LiftedRep -> Type) where #

Minimal complete definition

traverse1 | sequence1

Methods

traverse1 :: Apply f => (a -> f b) -> t a -> f (t b) #

Instances

Instances details

Traversable1 Complex
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> Complex a -> f (Complex b) # sequence1 :: Apply f => Complex (f b) -> f (Complex b) #
Traversable1 Identity
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> Identity a -> f (Identity b) # sequence1 :: Apply f => Identity (f b) -> f (Identity b) #
Traversable1 First
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> First a -> f (First b) # sequence1 :: Apply f => First (f b) -> f (First b) #
Traversable1 Last
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> Last a -> f (Last b) # sequence1 :: Apply f => Last (f b) -> f (Last b) #
Traversable1 Max
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> Max a -> f (Max b) # sequence1 :: Apply f => Max (f b) -> f (Max b) #
Traversable1 Min
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> Min a -> f (Min b) # sequence1 :: Apply f => Min (f b) -> f (Min b) #
Traversable1 Dual
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> Dual a -> f (Dual b) # sequence1 :: Apply f => Dual (f b) -> f (Dual b) #
Traversable1 Product
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> Product a -> f (Product b) # sequence1 :: Apply f => Product (f b) -> f (Product b) #
Traversable1 Sum
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> Sum a -> f (Sum b) # sequence1 :: Apply f => Sum (f b) -> f (Sum b) #
Traversable1 Par1
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> Par1 a -> f (Par1 b) # sequence1 :: Apply f => Par1 (f b) -> f (Par1 b) #
Traversable1 Tree
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> Tree a -> f (Tree b) # sequence1 :: Apply f => Tree (f b) -> f (Tree b) #
Traversable1 Plucker
Instance details Defined in Linear.Plucker Methods traverse1 :: Apply f => (a -> f b) -> Plucker a -> f (Plucker b) # sequence1 :: Apply f => Plucker (f b) -> f (Plucker b) #
Traversable1 V1
Instance details Defined in Linear.V1 Methods traverse1 :: Apply f => (a -> f b) -> V1 a -> f (V1 b) # sequence1 :: Apply f => V1 (f b) -> f (V1 b) #
Traversable1 V2
Instance details Defined in Linear.V2 Methods traverse1 :: Apply f => (a -> f b) -> V2 a -> f (V2 b) # sequence1 :: Apply f => V2 (f b) -> f (V2 b) #
Traversable1 V3
Instance details Defined in Linear.V3 Methods traverse1 :: Apply f => (a -> f b) -> V3 a -> f (V3 b) # sequence1 :: Apply f => V3 (f b) -> f (V3 b) #
Traversable1 V4
Instance details Defined in Linear.V4 Methods traverse1 :: Apply f => (a -> f b) -> V4 a -> f (V4 b) # sequence1 :: Apply f => V4 (f b) -> f (V4 b) #
Traversable1 NonEmpty
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> NonEmpty a -> f (NonEmpty b) # sequence1 :: Apply f => NonEmpty (f b) -> f (NonEmpty b) #
Traversable1 (V1 :: TYPE LiftedRep -> Type)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> V1 a -> f (V1 b) # sequence1 :: Apply f => V1 (f b) -> f (V1 b) #
Traversable1 f => Traversable1 (Cofree f)
Instance details Defined in Control.Comonad.Cofree Methods traverse1 :: Apply f0 => (a -> f0 b) -> Cofree f a -> f0 (Cofree f b) # sequence1 :: Apply f0 => Cofree f (f0 b) -> f0 (Cofree f b) #
Traversable1 f => Traversable1 (Free f)
Instance details Defined in Control.Monad.Free Methods traverse1 :: Apply f0 => (a -> f0 b) -> Free f a -> f0 (Free f b) # sequence1 :: Apply f0 => Free f (f0 b) -> f0 (Free f b) #
(Monad m, Traversable1 m) => Traversable1 (IterT m)
Instance details Defined in Control.Monad.Trans.Iter Methods traverse1 :: Apply f => (a -> f b) -> IterT m a -> f (IterT m b) # sequence1 :: Apply f => IterT m (f b) -> f (IterT m b) #
Traversable1 f => Traversable1 (Yoneda f)
Instance details Defined in Data.Functor.Yoneda Methods traverse1 :: Apply f0 => (a -> f0 b) -> Yoneda f a -> f0 (Yoneda f b) # sequence1 :: Apply f0 => Yoneda f (f0 b) -> f0 (Yoneda f b) #
Traversable1 f => Traversable1 (Lift f)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f0 => (a -> f0 b) -> Lift f a -> f0 (Lift f b) # sequence1 :: Apply f0 => Lift f (f0 b) -> f0 (Lift f b) #
Traversable1 ((,) a)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a0 -> f b) -> (a, a0) -> f (a, b) # sequence1 :: Apply f => (a, f b) -> f (a, b) #
Traversable1 f => Traversable1 (Alt f)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f0 => (a -> f0 b) -> Alt f a -> f0 (Alt f b) # sequence1 :: Apply f0 => Alt f (f0 b) -> f0 (Alt f b) #
Traversable1 f => Traversable1 (Rec1 f)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f0 => (a -> f0 b) -> Rec1 f a -> f0 (Rec1 f b) # sequence1 :: Apply f0 => Rec1 f (f0 b) -> f0 (Rec1 f b) #
Bitraversable1 p => Traversable1 (Join p)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a -> f b) -> Join p a -> f (Join p b) # sequence1 :: Apply f => Join p (f b) -> f (Join p b) #
Traversable1 f => Traversable1 (AlongsideLeft f b)
Instance details Defined in Control.Lens.Internal.Getter Methods traverse1 :: Apply f0 => (a -> f0 b0) -> AlongsideLeft f b a -> f0 (AlongsideLeft f b b0) # sequence1 :: Apply f0 => AlongsideLeft f b (f0 b0) -> f0 (AlongsideLeft f b b0) #
Traversable1 f => Traversable1 (AlongsideRight f a)
Instance details Defined in Control.Lens.Internal.Getter Methods traverse1 :: Apply f0 => (a0 -> f0 b) -> AlongsideRight f a a0 -> f0 (AlongsideRight f a b) # sequence1 :: Apply f0 => AlongsideRight f a (f0 b) -> f0 (AlongsideRight f a b) #
Traversable1 (Tagged a)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a0 -> f b) -> Tagged a a0 -> f (Tagged a b) # sequence1 :: Apply f => Tagged a (f b) -> f (Tagged a b) #
Traversable1 f => Traversable1 (Backwards f)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f0 => (a -> f0 b) -> Backwards f a -> f0 (Backwards f b) # sequence1 :: Apply f0 => Backwards f (f0 b) -> f0 (Backwards f b) #
Traversable1 f => Traversable1 (IdentityT f)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f0 => (a -> f0 b) -> IdentityT f a -> f0 (IdentityT f b) # sequence1 :: Apply f0 => IdentityT f (f0 b) -> f0 (IdentityT f b) #
Traversable1 f => Traversable1 (Reverse f)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f0 => (a -> f0 b) -> Reverse f a -> f0 (Reverse f b) # sequence1 :: Apply f0 => Reverse f (f0 b) -> f0 (Reverse f b) #
(Traversable1 f, Traversable1 g) => Traversable1 (Product f g)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f0 => (a -> f0 b) -> Product f g a -> f0 (Product f g b) # sequence1 :: Apply f0 => Product f g (f0 b) -> f0 (Product f g b) #
(Traversable1 f, Traversable1 g) => Traversable1 (Sum f g)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f0 => (a -> f0 b) -> Sum f g a -> f0 (Sum f g b) # sequence1 :: Apply f0 => Sum f g (f0 b) -> f0 (Sum f g b) #
(Traversable1 f, Traversable1 g) => Traversable1 (f :*: g)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f0 => (a -> f0 b) -> (f :: g) a -> f0 ((f :: g) b) # sequence1 :: Apply f0 => (f :: g) (f0 b) -> f0 ((f :: g) b) #
(Traversable1 f, Traversable1 g) => Traversable1 (f :+: g)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f0 => (a -> f0 b) -> (f :+: g) a -> f0 ((f :+: g) b) # sequence1 :: Apply f0 => (f :+: g) (f0 b) -> f0 ((f :+: g) b) #
(Traversable1 f, Traversable1 g) => Traversable1 (Compose f g)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f0 => (a -> f0 b) -> Compose f g a -> f0 (Compose f g b) # sequence1 :: Apply f0 => Compose f g (f0 b) -> f0 (Compose f g b) #
(Traversable1 f, Traversable1 g) => Traversable1 (f :.: g)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f0 => (a -> f0 b) -> (f :.: g) a -> f0 ((f :.: g) b) # sequence1 :: Apply f0 => (f :.: g) (f0 b) -> f0 ((f :.: g) b) #
Traversable1 f => Traversable1 (M1 i c f)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f0 => (a -> f0 b) -> M1 i c f a -> f0 (M1 i c f b) # sequence1 :: Apply f0 => M1 i c f (f0 b) -> f0 (M1 i c f b) #
Traversable1 g => Traversable1 (Joker g a)
Instance details Defined in Data.Semigroup.Traversable.Class Methods traverse1 :: Apply f => (a0 -> f b) -> Joker g a a0 -> f (Joker g a b) # sequence1 :: Apply f => Joker g a (f b) -> f (Joker g a b) #

foldBy :: Foldable t => (a -> a -> a) -> a -> t a -> a #

Fold a value using its Foldable instance using explicitly provided Monoid operations. This is like fold where the Monoid instance can be manually specified.

foldBy mappend mempty ≡ fold

>>> foldBy (++) [] ["hello","world"]
"helloworld"

foldMapBy :: Foldable t => (r -> r -> r) -> r -> (a -> r) -> t a -> r #

Fold a value using its Foldable instance using explicitly provided Monoid operations. This is like foldMap where the Monoid instance can be manually specified.

foldMapBy mappend mempty ≡ foldMap

>>> foldMapBy (+) 0 length ["hello","world"]
10

traverseBy :: Traversable t => (forall x. x -> f x) -> (forall x y. f (x -> y) -> f x -> f y) -> (a -> f b) -> t a -> f (t b) #

Traverse a container using its Traversable instance using explicitly provided Applicative operations. This is like traverse where the Applicative instance can be manually specified.

sequenceBy :: Traversable t => (forall x. x -> f x) -> (forall x y. f (x -> y) -> f x -> f y) -> t (f a) -> f (t a) #

Sequence a container using its Traversable instance using explicitly provided Applicative operations. This is like sequence where the Applicative instance can be manually specified.

class Profunctor p => Choice (p :: Type -> Type -> Type) where #

The generalization of Costar of Functor that is strong with respect to Either.

Note: This is also a notion of strength, except with regards to another monoidal structure that we can choose to equip Hask with: the cocartesian coproduct.

Minimal complete definition

left' | right'

Methods

left' :: p a b -> p (Either a c) (Either b c) #

Laws:

left' ≡ dimap swapE swapE . right' where
  swapE :: Either a b -> Either b a
  swapE = either Right Left
rmap Left ≡ lmap Left . left'
lmap (right f) . left' ≡ rmap (right f) . left'
left' . left' ≡ dimap assocE unassocE . left' where
  assocE :: Either (Either a b) c -> Either a (Either b c)
  assocE (Left (Left a)) = Left a
  assocE (Left (Right b)) = Right (Left b)
  assocE (Right c) = Right (Right c)
  unassocE :: Either a (Either b c) -> Either (Either a b) c
  unassocE (Left a) = Left (Left a)
  unassocE (Right (Left b)) = Left (Right b)
  unassocE (Right (Right c)) = Right c

right' :: p a b -> p (Either c a) (Either c b) #

Laws:

right' ≡ dimap swapE swapE . left' where
  swapE :: Either a b -> Either b a
  swapE = either Right Left
rmap Right ≡ lmap Right . right'
lmap (left f) . right' ≡ rmap (left f) . right'
right' . right' ≡ dimap unassocE assocE . right' where
  assocE :: Either (Either a b) c -> Either a (Either b c)
  assocE (Left (Left a)) = Left a
  assocE (Left (Right b)) = Right (Left b)
  assocE (Right c) = Right (Right c)
  unassocE :: Either a (Either b c) -> Either (Either a b) c
  unassocE (Left a) = Left (Left a)
  unassocE (Right (Left b)) = Left (Right b)
  unassocE (Right (Right c)) = Right c

Instances

Instances details

Choice ReifiedFold
Instance details Defined in Control.Lens.Reified Methods left' :: ReifiedFold a b -> ReifiedFold (Either a c) (Either b c) # right' :: ReifiedFold a b -> ReifiedFold (Either c a) (Either c b) #
Choice ReifiedGetter
Instance details Defined in Control.Lens.Reified Methods left' :: ReifiedGetter a b -> ReifiedGetter (Either a c) (Either b c) # right' :: ReifiedGetter a b -> ReifiedGetter (Either c a) (Either c b) #
Monad m => Choice (Kleisli m)
Instance details Defined in Data.Profunctor.Choice Methods left' :: Kleisli m a b -> Kleisli m (Either a c) (Either b c) # right' :: Kleisli m a b -> Kleisli m (Either c a) (Either c b) #
Choice (Indexed i)
Instance details Defined in Control.Lens.Internal.Indexed Methods left' :: Indexed i a b -> Indexed i (Either a c) (Either b c) # right' :: Indexed i a b -> Indexed i (Either c a) (Either c b) #
Choice (PastroSum p)
Instance details Defined in Data.Profunctor.Choice Methods left' :: PastroSum p a b -> PastroSum p (Either a c) (Either b c) # right' :: PastroSum p a b -> PastroSum p (Either c a) (Either c b) #
Profunctor p => Choice (TambaraSum p)
Instance details Defined in Data.Profunctor.Choice Methods left' :: TambaraSum p a b -> TambaraSum p (Either a c) (Either b c) # right' :: TambaraSum p a b -> TambaraSum p (Either c a) (Either c b) #
Choice p => Choice (Tambara p)
Instance details Defined in Data.Profunctor.Choice Methods left' :: Tambara p a b -> Tambara p (Either a c) (Either b c) # right' :: Tambara p a b -> Tambara p (Either c a) (Either c b) #
Choice (Tagged :: Type -> Type -> Type)
Instance details Defined in Data.Profunctor.Choice Methods left' :: Tagged a b -> Tagged (Either a c) (Either b c) # right' :: Tagged a b -> Tagged (Either c a) (Either c b) #
Comonad w => Choice (Cokleisli w)	`extract` approximates `costrength`
Instance details Defined in Data.Profunctor.Choice Methods left' :: Cokleisli w a b -> Cokleisli w (Either a c) (Either b c) # right' :: Cokleisli w a b -> Cokleisli w (Either c a) (Either c b) #
Choice (Market a b)
Instance details Defined in Control.Lens.Internal.Prism Methods left' :: Market a b a0 b0 -> Market a b (Either a0 c) (Either b0 c) # right' :: Market a b a0 b0 -> Market a b (Either c a0) (Either c b0) #
Monoid r => Choice (Forget r :: Type -> Type -> TYPE LiftedRep)
Instance details Defined in Data.Profunctor.Choice Methods left' :: Forget r a b -> Forget r (Either a c) (Either b c) # right' :: Forget r a b -> Forget r (Either c a) (Either c b) #
Applicative f => Choice (Star f)
Instance details Defined in Data.Profunctor.Choice Methods left' :: Star f a b -> Star f (Either a c) (Either b c) # right' :: Star f a b -> Star f (Either c a) (Either c b) #
Choice (->)
Instance details Defined in Data.Profunctor.Choice Methods left' :: (a -> b) -> Either a c -> Either b c # right' :: (a -> b) -> Either c a -> Either c b #
Functor f => Choice (Joker f :: Type -> Type -> Type)
Instance details Defined in Data.Profunctor.Choice Methods left' :: Joker f a b -> Joker f (Either a c) (Either b c) # right' :: Joker f a b -> Joker f (Either c a) (Either c b) #
ArrowChoice p => Choice (WrappedArrow p)
Instance details Defined in Data.Profunctor.Choice Methods left' :: WrappedArrow p a b -> WrappedArrow p (Either a c) (Either b c) # right' :: WrappedArrow p a b -> WrappedArrow p (Either c a) (Either c b) #
(Choice p, Choice q) => Choice (Product p q)
Instance details Defined in Data.Profunctor.Choice Methods left' :: Product p q a b -> Product p q (Either a c) (Either b c) # right' :: Product p q a b -> Product p q (Either c a) (Either c b) #
(Choice p, Choice q) => Choice (Sum p q)
Instance details Defined in Data.Profunctor.Choice Methods left' :: Sum p q a b -> Sum p q (Either a c) (Either b c) # right' :: Sum p q a b -> Sum p q (Either c a) (Either c b) #
(Functor f, Choice p) => Choice (Tannen f p)
Instance details Defined in Data.Profunctor.Choice Methods left' :: Tannen f p a b -> Tannen f p (Either a c) (Either b c) # right' :: Tannen f p a b -> Tannen f p (Either c a) (Either c b) #
(Functor f, Choice p) => Choice (Cayley f p)
Instance details Defined in Data.Profunctor.Cayley Methods left' :: Cayley f p a b -> Cayley f p (Either a c) (Either b c) # right' :: Cayley f p a b -> Cayley f p (Either c a) (Either c b) #
(Choice p, Choice q) => Choice (Procompose p q)
Instance details Defined in Data.Profunctor.Composition Methods left' :: Procompose p q a b -> Procompose p q (Either a c) (Either b c) # right' :: Procompose p q a b -> Procompose p q (Either c a) (Either c b) #

class Functor f => Applicative (f :: Type -> Type) where #

A functor with application, providing operations to

embed pure expressions (pure), and
sequence computations and combine their results (<*> and liftA2).

A minimal complete definition must include implementations of pure and of either <*> or liftA2. If it defines both, then they must behave the same as their default definitions:

(<*>) = liftA2 id

liftA2 f x y = f <$> x <*> y

Further, any definition must satisfy the following:

Identity

pure id <*> v = v

Composition

pure (.) <*> u <*> v <*> w = u <*> (v <*> w)

Homomorphism

pure f <*> pure x = pure (f x)

Interchange

u <*> pure y = pure ($ y) <*> u

The other methods have the following default definitions, which may be overridden with equivalent specialized implementations:

```
u *> v = (id <$ u) <*> v
```
```
u <* v = liftA2 const u v
```

As a consequence of these laws, the Functor instance for f will satisfy

```
fmap f x = pure f <*> x
```

It may be useful to note that supposing

forall x y. p (q x y) = f x . g y

it follows from the above that

liftA2 p (liftA2 q u v) = liftA2 f u . liftA2 g v

If f is also a Monad, it should satisfy

```
pure = return
```

m1 <*> m2 = m1 >>= (x1 -> m2 >>= (x2 -> return (x1 x2)))

```
(*>) = (>>)
```

(which implies that pure and <*> satisfy the applicative functor laws).

Minimal complete definition

pure, ((<*>) | liftA2)

Methods

pure :: a -> f a #

Lift a value.

(<*>) :: f (a -> b) -> f a -> f b infixl 4 #

Sequential application.

A few functors support an implementation of <*> that is more efficient than the default one.

Example

Expand

Used in combination with (<$>), (<*>) can be used to build a record.

>>> data MyState = MyState {arg1 :: Foo, arg2 :: Bar, arg3 :: Baz}

>>> produceFoo :: Applicative f => f Foo

>>> produceBar :: Applicative f => f Bar
>>> produceBaz :: Applicative f => f Baz

>>> mkState :: Applicative f => f MyState
>>> mkState = MyState <$> produceFoo <*> produceBar <*> produceBaz

liftA2 :: (a -> b -> c) -> f a -> f b -> f c #

Lift a binary function to actions.

Some functors support an implementation of liftA2 that is more efficient than the default one. In particular, if fmap is an expensive operation, it is likely better to use liftA2 than to fmap over the structure and then use <*>.

This became a typeclass method in 4.10.0.0. Prior to that, it was a function defined in terms of <*> and fmap.

Example

Expand

>>> liftA2 (,) (Just 3) (Just 5)
Just (3,5)

(*>) :: f a -> f b -> f b infixl 4 #

Sequence actions, discarding the value of the first argument.

Examples

Expand

If used in conjunction with the Applicative instance for Maybe, you can chain Maybe computations, with a possible "early return" in case of Nothing.

>>> Just 2 *> Just 3
Just 3

>>> Nothing *> Just 3
Nothing

Of course a more interesting use case would be to have effectful computations instead of just returning pure values.

>>> import Data.Char
>>> import Text.ParserCombinators.ReadP
>>> let p = string "my name is " *> munch1 isAlpha <* eof
>>> readP_to_S p "my name is Simon"
[("Simon","")]

(<*) :: f a -> f b -> f a infixl 4 #

Sequence actions, discarding the value of the second argument.

Instances

Instances details

Applicative Active
Instance details Defined in Data.Active Methods pure :: a -> Active a # (<>) :: Active (a -> b) -> Active a -> Active b # liftA2 :: (a -> b -> c) -> Active a -> Active b -> Active c # (>) :: Active a -> Active b -> Active b # (<*) :: Active a -> Active b -> Active a #
Applicative Duration
Instance details Defined in Data.Active Methods pure :: a -> Duration a # (<>) :: Duration (a -> b) -> Duration a -> Duration b # liftA2 :: (a -> b -> c) -> Duration a -> Duration b -> Duration c # (>) :: Duration a -> Duration b -> Duration b # (<*) :: Duration a -> Duration b -> Duration a #
Applicative ZipList	f <$> ZipList xs1 <> ... <> ZipList xsN = ZipList (zipWithN f xs1 ... xsN) where `zipWithN` refers to the `zipWith` function of the appropriate arity (`zipWith`, `zipWith3`, `zipWith4`, ...). For example: (\a b c -> stimes c [a, b]) <$> ZipList "abcd" <> ZipList "567" <> ZipList [1..] = ZipList (zipWith3 (\a b c -> stimes c [a, b]) "abcd" "567" [1..]) = ZipList {getZipList = ["a5","b6b6","c7c7c7"]} Since: base-2.1
Instance details Defined in Control.Applicative Methods pure :: a -> ZipList a # (<>) :: ZipList (a -> b) -> ZipList a -> ZipList b # liftA2 :: (a -> b -> c) -> ZipList a -> ZipList b -> ZipList c # (>) :: ZipList a -> ZipList b -> ZipList b # (<*) :: ZipList a -> ZipList b -> ZipList a #
Applicative Complex	Since: base-4.9.0.0
Instance details Defined in Data.Complex Methods pure :: a -> Complex a # (<>) :: Complex (a -> b) -> Complex a -> Complex b # liftA2 :: (a -> b -> c) -> Complex a -> Complex b -> Complex c # (>) :: Complex a -> Complex b -> Complex b # (<*) :: Complex a -> Complex b -> Complex a #
Applicative Identity	Since: base-4.8.0.0
Instance details Defined in Data.Functor.Identity Methods pure :: a -> Identity a # (<>) :: Identity (a -> b) -> Identity a -> Identity b # liftA2 :: (a -> b -> c) -> Identity a -> Identity b -> Identity c # (>) :: Identity a -> Identity b -> Identity b # (<*) :: Identity a -> Identity b -> Identity a #
Applicative First	Since: base-4.8.0.0
Instance details Defined in Data.Monoid Methods pure :: a -> First a # (<>) :: First (a -> b) -> First a -> First b # liftA2 :: (a -> b -> c) -> First a -> First b -> First c # (>) :: First a -> First b -> First b # (<*) :: First a -> First b -> First a #
Applicative Last	Since: base-4.8.0.0
Instance details Defined in Data.Monoid Methods pure :: a -> Last a # (<>) :: Last (a -> b) -> Last a -> Last b # liftA2 :: (a -> b -> c) -> Last a -> Last b -> Last c # (>) :: Last a -> Last b -> Last b # (<*) :: Last a -> Last b -> Last a #
Applicative Down	Since: base-4.11.0.0
Instance details Defined in Data.Ord Methods pure :: a -> Down a # (<>) :: Down (a -> b) -> Down a -> Down b # liftA2 :: (a -> b -> c) -> Down a -> Down b -> Down c # (>) :: Down a -> Down b -> Down b # (<*) :: Down a -> Down b -> Down a #
Applicative First	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods pure :: a -> First a # (<>) :: First (a -> b) -> First a -> First b # liftA2 :: (a -> b -> c) -> First a -> First b -> First c # (>) :: First a -> First b -> First b # (<*) :: First a -> First b -> First a #
Applicative Last	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods pure :: a -> Last a # (<>) :: Last (a -> b) -> Last a -> Last b # liftA2 :: (a -> b -> c) -> Last a -> Last b -> Last c # (>) :: Last a -> Last b -> Last b # (<*) :: Last a -> Last b -> Last a #
Applicative Max	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods pure :: a -> Max a # (<>) :: Max (a -> b) -> Max a -> Max b # liftA2 :: (a -> b -> c) -> Max a -> Max b -> Max c # (>) :: Max a -> Max b -> Max b # (<*) :: Max a -> Max b -> Max a #
Applicative Min	Since: base-4.9.0.0
Instance details Defined in Data.Semigroup Methods pure :: a -> Min a # (<>) :: Min (a -> b) -> Min a -> Min b # liftA2 :: (a -> b -> c) -> Min a -> Min b -> Min c # (>) :: Min a -> Min b -> Min b # (<*) :: Min a -> Min b -> Min a #
Applicative Dual	Since: base-4.8.0.0
Instance details Defined in Data.Semigroup.Internal Methods pure :: a -> Dual a # (<>) :: Dual (a -> b) -> Dual a -> Dual b # liftA2 :: (a -> b -> c) -> Dual a -> Dual b -> Dual c # (>) :: Dual a -> Dual b -> Dual b # (<*) :: Dual a -> Dual b -> Dual a #
Applicative Product	Since: base-4.8.0.0
Instance details Defined in Data.Semigroup.Internal Methods pure :: a -> Product a # (<>) :: Product (a -> b) -> Product a -> Product b # liftA2 :: (a -> b -> c) -> Product a -> Product b -> Product c # (>) :: Product a -> Product b -> Product b # (<*) :: Product a -> Product b -> Product a #
Applicative Sum	Since: base-4.8.0.0
Instance details Defined in Data.Semigroup.Internal Methods pure :: a -> Sum a # (<>) :: Sum (a -> b) -> Sum a -> Sum b # liftA2 :: (a -> b -> c) -> Sum a -> Sum b -> Sum c # (>) :: Sum a -> Sum b -> Sum b # (<*) :: Sum a -> Sum b -> Sum a #
Applicative STM	Since: base-4.8.0.0
Instance details Defined in GHC.Conc.Sync Methods pure :: a -> STM a # (<>) :: STM (a -> b) -> STM a -> STM b # liftA2 :: (a -> b -> c) -> STM a -> STM b -> STM c # (>) :: STM a -> STM b -> STM b # (<*) :: STM a -> STM b -> STM a #
Applicative Par1	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Methods pure :: a -> Par1 a # (<>) :: Par1 (a -> b) -> Par1 a -> Par1 b # liftA2 :: (a -> b -> c) -> Par1 a -> Par1 b -> Par1 c # (>) :: Par1 a -> Par1 b -> Par1 b # (<*) :: Par1 a -> Par1 b -> Par1 a #
Applicative P	Since: base-4.5.0.0
Instance details Defined in Text.ParserCombinators.ReadP Methods pure :: a -> P a # (<>) :: P (a -> b) -> P a -> P b # liftA2 :: (a -> b -> c) -> P a -> P b -> P c # (>) :: P a -> P b -> P b # (<*) :: P a -> P b -> P a #
Applicative ReadP	Since: base-4.6.0.0
Instance details Defined in Text.ParserCombinators.ReadP Methods pure :: a -> ReadP a # (<>) :: ReadP (a -> b) -> ReadP a -> ReadP b # liftA2 :: (a -> b -> c) -> ReadP a -> ReadP b -> ReadP c # (>) :: ReadP a -> ReadP b -> ReadP b # (<*) :: ReadP a -> ReadP b -> ReadP a #
Applicative ReadPrec	Since: base-4.6.0.0
Instance details Defined in Text.ParserCombinators.ReadPrec Methods pure :: a -> ReadPrec a # (<>) :: ReadPrec (a -> b) -> ReadPrec a -> ReadPrec b # liftA2 :: (a -> b -> c) -> ReadPrec a -> ReadPrec b -> ReadPrec c # (>) :: ReadPrec a -> ReadPrec b -> ReadPrec b # (<*) :: ReadPrec a -> ReadPrec b -> ReadPrec a #
Applicative Put
Instance details Defined in Data.ByteString.Builder.Internal Methods pure :: a -> Put a # (<>) :: Put (a -> b) -> Put a -> Put b # liftA2 :: (a -> b -> c) -> Put a -> Put b -> Put c # (>) :: Put a -> Put b -> Put b # (<*) :: Put a -> Put b -> Put a #
Applicative Get
Instance details Defined in Data.Serialize.Get Methods pure :: a -> Get a # (<>) :: Get (a -> b) -> Get a -> Get b # liftA2 :: (a -> b -> c) -> Get a -> Get b -> Get c # (>) :: Get a -> Get b -> Get b # (<*) :: Get a -> Get b -> Get a #
Applicative PutM
Instance details Defined in Data.Serialize.Put Methods pure :: a -> PutM a # (<>) :: PutM (a -> b) -> PutM a -> PutM b # liftA2 :: (a -> b -> c) -> PutM a -> PutM b -> PutM c # (>) :: PutM a -> PutM b -> PutM b # (<*) :: PutM a -> PutM b -> PutM a #
Applicative RGB
Instance details Defined in Data.Colour.RGB Methods pure :: a -> RGB a # (<>) :: RGB (a -> b) -> RGB a -> RGB b # liftA2 :: (a -> b -> c) -> RGB a -> RGB b -> RGB c # (>) :: RGB a -> RGB b -> RGB b # (<*) :: RGB a -> RGB b -> RGB a #
Applicative Seq	Since: containers-0.5.4
Instance details Defined in Data.Sequence.Internal Methods pure :: a -> Seq a # (<>) :: Seq (a -> b) -> Seq a -> Seq b # liftA2 :: (a -> b -> c) -> Seq a -> Seq b -> Seq c # (>) :: Seq a -> Seq b -> Seq b # (<*) :: Seq a -> Seq b -> Seq a #
Applicative Tree
Instance details Defined in Data.Tree Methods pure :: a -> Tree a # (<>) :: Tree (a -> b) -> Tree a -> Tree b # liftA2 :: (a -> b -> c) -> Tree a -> Tree b -> Tree c # (>) :: Tree a -> Tree b -> Tree b # (<*) :: Tree a -> Tree b -> Tree a #
Applicative Angle Source #
Instance details Defined in Diagrams.Angle Methods pure :: a -> Angle a # (<>) :: Angle (a -> b) -> Angle a -> Angle b # liftA2 :: (a -> b -> c) -> Angle a -> Angle b -> Angle c # (>) :: Angle a -> Angle b -> Angle b # (<*) :: Angle a -> Angle b -> Angle a #
Applicative IO	Since: base-2.1
Instance details Defined in GHC.Base Methods pure :: a -> IO a # (<>) :: IO (a -> b) -> IO a -> IO b # liftA2 :: (a -> b -> c) -> IO a -> IO b -> IO c # (>) :: IO a -> IO b -> IO b # (<*) :: IO a -> IO b -> IO a #
Applicative Interval
Instance details Defined in Numeric.Interval.Kaucher Methods pure :: a -> Interval a # (<>) :: Interval (a -> b) -> Interval a -> Interval b # liftA2 :: (a -> b -> c) -> Interval a -> Interval b -> Interval c # (>) :: Interval a -> Interval b -> Interval b # (<*) :: Interval a -> Interval b -> Interval a #
Applicative Plucker
Instance details Defined in Linear.Plucker Methods pure :: a -> Plucker a # (<>) :: Plucker (a -> b) -> Plucker a -> Plucker b # liftA2 :: (a -> b -> c) -> Plucker a -> Plucker b -> Plucker c # (>) :: Plucker a -> Plucker b -> Plucker b # (<*) :: Plucker a -> Plucker b -> Plucker a #
Applicative Quaternion
Instance details Defined in Linear.Quaternion Methods pure :: a -> Quaternion a # (<>) :: Quaternion (a -> b) -> Quaternion a -> Quaternion b # liftA2 :: (a -> b -> c) -> Quaternion a -> Quaternion b -> Quaternion c # (>) :: Quaternion a -> Quaternion b -> Quaternion b # (<*) :: Quaternion a -> Quaternion b -> Quaternion a #
Applicative V0
Instance details Defined in Linear.V0 Methods pure :: a -> V0 a # (<>) :: V0 (a -> b) -> V0 a -> V0 b # liftA2 :: (a -> b -> c) -> V0 a -> V0 b -> V0 c # (>) :: V0 a -> V0 b -> V0 b # (<*) :: V0 a -> V0 b -> V0 a #
Applicative V1
Instance details Defined in Linear.V1 Methods pure :: a -> V1 a # (<>) :: V1 (a -> b) -> V1 a -> V1 b # liftA2 :: (a -> b -> c) -> V1 a -> V1 b -> V1 c # (>) :: V1 a -> V1 b -> V1 b # (<*) :: V1 a -> V1 b -> V1 a #
Applicative V2
Instance details Defined in Linear.V2 Methods pure :: a -> V2 a # (<>) :: V2 (a -> b) -> V2 a -> V2 b # liftA2 :: (a -> b -> c) -> V2 a -> V2 b -> V2 c # (>) :: V2 a -> V2 b -> V2 b # (<*) :: V2 a -> V2 b -> V2 a #
Applicative V3
Instance details Defined in Linear.V3 Methods pure :: a -> V3 a # (<>) :: V3 (a -> b) -> V3 a -> V3 b # liftA2 :: (a -> b -> c) -> V3 a -> V3 b -> V3 c # (>) :: V3 a -> V3 b -> V3 b # (<*) :: V3 a -> V3 b -> V3 a #
Applicative V4
Instance details Defined in Linear.V4 Methods pure :: a -> V4 a # (<>) :: V4 (a -> b) -> V4 a -> V4 b # liftA2 :: (a -> b -> c) -> V4 a -> V4 b -> V4 c # (>) :: V4 a -> V4 b -> V4 b # (<*) :: V4 a -> V4 b -> V4 a #
Applicative Parser
Instance details Defined in Options.Applicative.Types Methods pure :: a -> Parser a # (<>) :: Parser (a -> b) -> Parser a -> Parser b # liftA2 :: (a -> b -> c) -> Parser a -> Parser b -> Parser c # (>) :: Parser a -> Parser b -> Parser b # (<*) :: Parser a -> Parser b -> Parser a #
Applicative ParserM
Instance details Defined in Options.Applicative.Types Methods pure :: a -> ParserM a # (<>) :: ParserM (a -> b) -> ParserM a -> ParserM b # liftA2 :: (a -> b -> c) -> ParserM a -> ParserM b -> ParserM c # (>) :: ParserM a -> ParserM b -> ParserM b # (<*) :: ParserM a -> ParserM b -> ParserM a #
Applicative ParserResult
Instance details Defined in Options.Applicative.Types Methods pure :: a -> ParserResult a # (<>) :: ParserResult (a -> b) -> ParserResult a -> ParserResult b # liftA2 :: (a -> b -> c) -> ParserResult a -> ParserResult b -> ParserResult c # (>) :: ParserResult a -> ParserResult b -> ParserResult b # (<*) :: ParserResult a -> ParserResult b -> ParserResult a #
Applicative ReadM
Instance details Defined in Options.Applicative.Types Methods pure :: a -> ReadM a # (<>) :: ReadM (a -> b) -> ReadM a -> ReadM b # liftA2 :: (a -> b -> c) -> ReadM a -> ReadM b -> ReadM c # (>) :: ReadM a -> ReadM b -> ReadM b # (<*) :: ReadM a -> ReadM b -> ReadM a #
Applicative Array
Instance details Defined in Data.Primitive.Array Methods pure :: a -> Array a # (<>) :: Array (a -> b) -> Array a -> Array b # liftA2 :: (a -> b -> c) -> Array a -> Array b -> Array c # (>) :: Array a -> Array b -> Array b # (<*) :: Array a -> Array b -> Array a #
Applicative SmallArray
Instance details Defined in Data.Primitive.SmallArray Methods pure :: a -> SmallArray a # (<>) :: SmallArray (a -> b) -> SmallArray a -> SmallArray b # liftA2 :: (a -> b -> c) -> SmallArray a -> SmallArray b -> SmallArray c # (>) :: SmallArray a -> SmallArray b -> SmallArray b # (<*) :: SmallArray a -> SmallArray b -> SmallArray a #
Applicative Q
Instance details Defined in Language.Haskell.TH.Syntax Methods pure :: a -> Q a # (<>) :: Q (a -> b) -> Q a -> Q b # liftA2 :: (a -> b -> c) -> Q a -> Q b -> Q c # (>) :: Q a -> Q b -> Q b # (<*) :: Q a -> Q b -> Q a #
Applicative Vector
Instance details Defined in Data.Vector Methods pure :: a -> Vector a # (<>) :: Vector (a -> b) -> Vector a -> Vector b # liftA2 :: (a -> b -> c) -> Vector a -> Vector b -> Vector c # (>) :: Vector a -> Vector b -> Vector b # (<*) :: Vector a -> Vector b -> Vector a #
Applicative Id
Instance details Defined in Data.Vector.Fusion.Util Methods pure :: a -> Id a # (<>) :: Id (a -> b) -> Id a -> Id b # liftA2 :: (a -> b -> c) -> Id a -> Id b -> Id c # (>) :: Id a -> Id b -> Id b # (<*) :: Id a -> Id b -> Id a #
Applicative Stream
Instance details Defined in Codec.Compression.Zlib.Stream Methods pure :: a -> Stream a # (<>) :: Stream (a -> b) -> Stream a -> Stream b # liftA2 :: (a -> b -> c) -> Stream a -> Stream b -> Stream c # (>) :: Stream a -> Stream b -> Stream b # (<*) :: Stream a -> Stream b -> Stream a #
Applicative NonEmpty	Since: base-4.9.0.0
Instance details Defined in GHC.Base Methods pure :: a -> NonEmpty a # (<>) :: NonEmpty (a -> b) -> NonEmpty a -> NonEmpty b # liftA2 :: (a -> b -> c) -> NonEmpty a -> NonEmpty b -> NonEmpty c # (>) :: NonEmpty a -> NonEmpty b -> NonEmpty b # (<*) :: NonEmpty a -> NonEmpty b -> NonEmpty a #
Applicative Maybe	Since: base-2.1
Instance details Defined in GHC.Base Methods pure :: a -> Maybe a # (<>) :: Maybe (a -> b) -> Maybe a -> Maybe b # liftA2 :: (a -> b -> c) -> Maybe a -> Maybe b -> Maybe c # (>) :: Maybe a -> Maybe b -> Maybe b # (<*) :: Maybe a -> Maybe b -> Maybe a #
Applicative Solo	Since: base-4.15
Instance details Defined in GHC.Base Methods pure :: a -> Solo a # (<>) :: Solo (a -> b) -> Solo a -> Solo b # liftA2 :: (a -> b -> c) -> Solo a -> Solo b -> Solo c # (>) :: Solo a -> Solo b -> Solo b # (<*) :: Solo a -> Solo b -> Solo a #
Applicative []	Since: base-2.1
Instance details Defined in GHC.Base Methods pure :: a -> [a] # (<>) :: [a -> b] -> [a] -> [b] # liftA2 :: (a -> b -> c) -> [a] -> [b] -> [c] # (>) :: [a] -> [b] -> [b] # (<*) :: [a] -> [b] -> [a] #
Applicative (Fold a)
Instance details Defined in Codec.Picture.ColorQuant Methods pure :: a0 -> Fold a a0 # (<>) :: Fold a (a0 -> b) -> Fold a a0 -> Fold a b # liftA2 :: (a0 -> b -> c) -> Fold a a0 -> Fold a b -> Fold a c # (>) :: Fold a a0 -> Fold a b -> Fold a b # (<*) :: Fold a a0 -> Fold a b -> Fold a a0 #
Representable f => Applicative (Co f)
Instance details Defined in Data.Functor.Rep Methods pure :: a -> Co f a # (<>) :: Co f (a -> b) -> Co f a -> Co f b # liftA2 :: (a -> b -> c) -> Co f a -> Co f b -> Co f c # (>) :: Co f a -> Co f b -> Co f b # (<*) :: Co f a -> Co f b -> Co f a #
Monad m => Applicative (WrappedMonad m)	Since: base-2.1
Instance details Defined in Control.Applicative Methods pure :: a -> WrappedMonad m a # (<>) :: WrappedMonad m (a -> b) -> WrappedMonad m a -> WrappedMonad m b # liftA2 :: (a -> b -> c) -> WrappedMonad m a -> WrappedMonad m b -> WrappedMonad m c # (>) :: WrappedMonad m a -> WrappedMonad m b -> WrappedMonad m b # (<*) :: WrappedMonad m a -> WrappedMonad m b -> WrappedMonad m a #
Arrow a => Applicative (ArrowMonad a)	Since: base-4.6.0.0
Instance details Defined in Control.Arrow Methods pure :: a0 -> ArrowMonad a a0 # (<>) :: ArrowMonad a (a0 -> b) -> ArrowMonad a a0 -> ArrowMonad a b # liftA2 :: (a0 -> b -> c) -> ArrowMonad a a0 -> ArrowMonad a b -> ArrowMonad a c # (>) :: ArrowMonad a a0 -> ArrowMonad a b -> ArrowMonad a b # (<*) :: ArrowMonad a a0 -> ArrowMonad a b -> ArrowMonad a a0 #
Applicative (Either e)	Since: base-3.0
Instance details Defined in Data.Either Methods pure :: a -> Either e a # (<>) :: Either e (a -> b) -> Either e a -> Either e b # liftA2 :: (a -> b -> c) -> Either e a -> Either e b -> Either e c # (>) :: Either e a -> Either e b -> Either e b # (<*) :: Either e a -> Either e b -> Either e a #
Applicative (Proxy :: Type -> Type)	Since: base-4.7.0.0
Instance details Defined in Data.Proxy Methods pure :: a -> Proxy a # (<>) :: Proxy (a -> b) -> Proxy a -> Proxy b # liftA2 :: (a -> b -> c) -> Proxy a -> Proxy b -> Proxy c # (>) :: Proxy a -> Proxy b -> Proxy b # (<*) :: Proxy a -> Proxy b -> Proxy a #
Applicative (U1 :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Methods pure :: a -> U1 a # (<>) :: U1 (a -> b) -> U1 a -> U1 b # liftA2 :: (a -> b -> c) -> U1 a -> U1 b -> U1 c # (>) :: U1 a -> U1 b -> U1 b # (<*) :: U1 a -> U1 b -> U1 a #
Applicative (ST s)	Since: base-4.4.0.0
Instance details Defined in GHC.ST Methods pure :: a -> ST s a # (<>) :: ST s (a -> b) -> ST s a -> ST s b # liftA2 :: (a -> b -> c) -> ST s a -> ST s b -> ST s c # (>) :: ST s a -> ST s b -> ST s b # (<*) :: ST s a -> ST s b -> ST s a #
Applicative (Measured n)
Instance details Defined in Diagrams.Core.Measure Methods pure :: a -> Measured n a # (<>) :: Measured n (a -> b) -> Measured n a -> Measured n b # liftA2 :: (a -> b -> c) -> Measured n a -> Measured n b -> Measured n c # (>) :: Measured n a -> Measured n b -> Measured n b # (<*) :: Measured n a -> Measured n b -> Measured n a #
Monad m => Applicative (CatchT m)
Instance details Defined in Control.Monad.Catch.Pure Methods pure :: a -> CatchT m a # (<>) :: CatchT m (a -> b) -> CatchT m a -> CatchT m b # liftA2 :: (a -> b -> c) -> CatchT m a -> CatchT m b -> CatchT m c # (>) :: CatchT m a -> CatchT m b -> CatchT m b # (<*) :: CatchT m a -> CatchT m b -> CatchT m a #
Applicative (Alt f)
Instance details Defined in Control.Alternative.Free Methods pure :: a -> Alt f a # (<>) :: Alt f (a -> b) -> Alt f a -> Alt f b # liftA2 :: (a -> b -> c) -> Alt f a -> Alt f b -> Alt f c # (>) :: Alt f a -> Alt f b -> Alt f b # (<*) :: Alt f a -> Alt f b -> Alt f a #
Applicative (AltF f)
Instance details Defined in Control.Alternative.Free Methods pure :: a -> AltF f a # (<>) :: AltF f (a -> b) -> AltF f a -> AltF f b # liftA2 :: (a -> b -> c) -> AltF f a -> AltF f b -> AltF f c # (>) :: AltF f a -> AltF f b -> AltF f b # (<*) :: AltF f a -> AltF f b -> AltF f a #
Alternative f => Applicative (Cofree f)
Instance details Defined in Control.Comonad.Cofree Methods pure :: a -> Cofree f a # (<>) :: Cofree f (a -> b) -> Cofree f a -> Cofree f b # liftA2 :: (a -> b -> c) -> Cofree f a -> Cofree f b -> Cofree f c # (>) :: Cofree f a -> Cofree f b -> Cofree f b # (<*) :: Cofree f a -> Cofree f b -> Cofree f a #
Functor f => Applicative (Free f)
Instance details Defined in Control.Monad.Free Methods pure :: a -> Free f a # (<>) :: Free f (a -> b) -> Free f a -> Free f b # liftA2 :: (a -> b -> c) -> Free f a -> Free f b -> Free f c # (>) :: Free f a -> Free f b -> Free f b # (<*) :: Free f a -> Free f b -> Free f a #
Monad m => Applicative (IterT m)
Instance details Defined in Control.Monad.Trans.Iter Methods pure :: a -> IterT m a # (<>) :: IterT m (a -> b) -> IterT m a -> IterT m b # liftA2 :: (a -> b -> c) -> IterT m a -> IterT m b -> IterT m c # (>) :: IterT m a -> IterT m b -> IterT m b # (<*) :: IterT m a -> IterT m b -> IterT m a #
Applicative f => Applicative (Yoneda f)
Instance details Defined in Data.Functor.Yoneda Methods pure :: a -> Yoneda f a # (<>) :: Yoneda f (a -> b) -> Yoneda f a -> Yoneda f b # liftA2 :: (a -> b -> c) -> Yoneda f a -> Yoneda f b -> Yoneda f c # (>) :: Yoneda f a -> Yoneda f b -> Yoneda f b # (<*) :: Yoneda f a -> Yoneda f b -> Yoneda f a #
Applicative f => Applicative (Indexing f)
Instance details Defined in Control.Lens.Internal.Indexed Methods pure :: a -> Indexing f a # (<>) :: Indexing f (a -> b) -> Indexing f a -> Indexing f b # liftA2 :: (a -> b -> c) -> Indexing f a -> Indexing f b -> Indexing f c # (>) :: Indexing f a -> Indexing f b -> Indexing f b # (<*) :: Indexing f a -> Indexing f b -> Indexing f a #
Applicative f => Applicative (Indexing64 f)
Instance details Defined in Control.Lens.Internal.Indexed Methods pure :: a -> Indexing64 f a # (<>) :: Indexing64 f (a -> b) -> Indexing64 f a -> Indexing64 f b # liftA2 :: (a -> b -> c) -> Indexing64 f a -> Indexing64 f b -> Indexing64 f c # (>) :: Indexing64 f a -> Indexing64 f b -> Indexing64 f b # (<*) :: Indexing64 f a -> Indexing64 f b -> Indexing64 f a #
Applicative (ReifiedFold s)
Instance details Defined in Control.Lens.Reified Methods pure :: a -> ReifiedFold s a # (<>) :: ReifiedFold s (a -> b) -> ReifiedFold s a -> ReifiedFold s b # liftA2 :: (a -> b -> c) -> ReifiedFold s a -> ReifiedFold s b -> ReifiedFold s c # (>) :: ReifiedFold s a -> ReifiedFold s b -> ReifiedFold s b # (<*) :: ReifiedFold s a -> ReifiedFold s b -> ReifiedFold s a #
Applicative (ReifiedGetter s)
Instance details Defined in Control.Lens.Reified Methods pure :: a -> ReifiedGetter s a # (<>) :: ReifiedGetter s (a -> b) -> ReifiedGetter s a -> ReifiedGetter s b # liftA2 :: (a -> b -> c) -> ReifiedGetter s a -> ReifiedGetter s b -> ReifiedGetter s c # (>) :: ReifiedGetter s a -> ReifiedGetter s b -> ReifiedGetter s b # (<*) :: ReifiedGetter s a -> ReifiedGetter s b -> ReifiedGetter s a #
Applicative f => Applicative (Point f)
Instance details Defined in Linear.Affine Methods pure :: a -> Point f a # (<>) :: Point f (a -> b) -> Point f a -> Point f b # liftA2 :: (a -> b -> c) -> Point f a -> Point f b -> Point f c # (>) :: Point f a -> Point f b -> Point f b # (<*) :: Point f a -> Point f b -> Point f a #
Applicative (Covector r)
Instance details Defined in Linear.Covector Methods pure :: a -> Covector r a # (<>) :: Covector r (a -> b) -> Covector r a -> Covector r b # liftA2 :: (a -> b -> c) -> Covector r a -> Covector r b -> Covector r c # (>) :: Covector r a -> Covector r b -> Covector r b # (<*) :: Covector r a -> Covector r b -> Covector r a #
Applicative (Inf p)
Instance details Defined in Data.Monoid.Inf Methods pure :: a -> Inf p a # (<>) :: Inf p (a -> b) -> Inf p a -> Inf p b # liftA2 :: (a -> b -> c) -> Inf p a -> Inf p b -> Inf p c # (>) :: Inf p a -> Inf p b -> Inf p b # (<*) :: Inf p a -> Inf p b -> Inf p a #
Apply f => Applicative (MaybeApply f)
Instance details Defined in Data.Functor.Bind.Class Methods pure :: a -> MaybeApply f a # (<>) :: MaybeApply f (a -> b) -> MaybeApply f a -> MaybeApply f b # liftA2 :: (a -> b -> c) -> MaybeApply f a -> MaybeApply f b -> MaybeApply f c # (>) :: MaybeApply f a -> MaybeApply f b -> MaybeApply f b # (<*) :: MaybeApply f a -> MaybeApply f b -> MaybeApply f a #
Applicative f => Applicative (WrappedApplicative f)
Instance details Defined in Data.Functor.Bind.Class Methods pure :: a -> WrappedApplicative f a # (<>) :: WrappedApplicative f (a -> b) -> WrappedApplicative f a -> WrappedApplicative f b # liftA2 :: (a -> b -> c) -> WrappedApplicative f a -> WrappedApplicative f b -> WrappedApplicative f c # (>) :: WrappedApplicative f a -> WrappedApplicative f b -> WrappedApplicative f b # (<*) :: WrappedApplicative f a -> WrappedApplicative f b -> WrappedApplicative f a #
Semigroup a => Applicative (These a)
Instance details Defined in Data.Strict.These Methods pure :: a0 -> These a a0 # (<>) :: These a (a0 -> b) -> These a a0 -> These a b # liftA2 :: (a0 -> b -> c) -> These a a0 -> These a b -> These a c # (>) :: These a a0 -> These a b -> These a b # (<*) :: These a a0 -> These a b -> These a a0 #
Semigroup a => Applicative (These a)
Instance details Defined in Data.These Methods pure :: a0 -> These a a0 # (<>) :: These a (a0 -> b) -> These a a0 -> These a b # liftA2 :: (a0 -> b -> c) -> These a a0 -> These a b -> These a c # (>) :: These a a0 -> These a b -> These a b # (<*) :: These a a0 -> These a b -> These a a0 #
Applicative m => Applicative (ListT m)
Instance details Defined in Control.Monad.Trans.List Methods pure :: a -> ListT m a # (<>) :: ListT m (a -> b) -> ListT m a -> ListT m b # liftA2 :: (a -> b -> c) -> ListT m a -> ListT m b -> ListT m c # (>) :: ListT m a -> ListT m b -> ListT m b # (<*) :: ListT m a -> ListT m b -> ListT m a #
(Functor m, Monad m) => Applicative (MaybeT m)
Instance details Defined in Control.Monad.Trans.Maybe Methods pure :: a -> MaybeT m a # (<>) :: MaybeT m (a -> b) -> MaybeT m a -> MaybeT m b # liftA2 :: (a -> b -> c) -> MaybeT m a -> MaybeT m b -> MaybeT m c # (>) :: MaybeT m a -> MaybeT m b -> MaybeT m b # (<*) :: MaybeT m a -> MaybeT m b -> MaybeT m a #
Monoid a => Applicative ((,) a)	For tuples, the `Monoid` constraint on `a` determines how the first values merge. For example, `String`s concatenate: ("hello ", (+15)) <> ("world!", 2002) ("hello world!",2017) Since: base-2.1*
Instance details Defined in GHC.Base Methods pure :: a0 -> (a, a0) # (<>) :: (a, a0 -> b) -> (a, a0) -> (a, b) # liftA2 :: (a0 -> b -> c) -> (a, a0) -> (a, b) -> (a, c) # (>) :: (a, a0) -> (a, b) -> (a, b) # (<*) :: (a, a0) -> (a, b) -> (a, a0) #
Arrow a => Applicative (WrappedArrow a b)	Since: base-2.1
Instance details Defined in Control.Applicative Methods pure :: a0 -> WrappedArrow a b a0 # (<>) :: WrappedArrow a b (a0 -> b0) -> WrappedArrow a b a0 -> WrappedArrow a b b0 # liftA2 :: (a0 -> b0 -> c) -> WrappedArrow a b a0 -> WrappedArrow a b b0 -> WrappedArrow a b c # (>) :: WrappedArrow a b a0 -> WrappedArrow a b b0 -> WrappedArrow a b b0 # (<*) :: WrappedArrow a b a0 -> WrappedArrow a b b0 -> WrappedArrow a b a0 #
Applicative m => Applicative (Kleisli m a)	Since: base-4.14.0.0
Instance details Defined in Control.Arrow Methods pure :: a0 -> Kleisli m a a0 # (<>) :: Kleisli m a (a0 -> b) -> Kleisli m a a0 -> Kleisli m a b # liftA2 :: (a0 -> b -> c) -> Kleisli m a a0 -> Kleisli m a b -> Kleisli m a c # (>) :: Kleisli m a a0 -> Kleisli m a b -> Kleisli m a b # (<*) :: Kleisli m a a0 -> Kleisli m a b -> Kleisli m a a0 #
Monoid m => Applicative (Const m :: Type -> Type)	Since: base-2.0.1
Instance details Defined in Data.Functor.Const Methods pure :: a -> Const m a # (<>) :: Const m (a -> b) -> Const m a -> Const m b # liftA2 :: (a -> b -> c) -> Const m a -> Const m b -> Const m c # (>) :: Const m a -> Const m b -> Const m b # (<*) :: Const m a -> Const m b -> Const m a #
Applicative f => Applicative (Ap f)	Since: base-4.12.0.0
Instance details Defined in Data.Monoid Methods pure :: a -> Ap f a # (<>) :: Ap f (a -> b) -> Ap f a -> Ap f b # liftA2 :: (a -> b -> c) -> Ap f a -> Ap f b -> Ap f c # (>) :: Ap f a -> Ap f b -> Ap f b # (<*) :: Ap f a -> Ap f b -> Ap f a #
Applicative f => Applicative (Alt f)	Since: base-4.8.0.0
Instance details Defined in Data.Semigroup.Internal Methods pure :: a -> Alt f a # (<>) :: Alt f (a -> b) -> Alt f a -> Alt f b # liftA2 :: (a -> b -> c) -> Alt f a -> Alt f b -> Alt f c # (>) :: Alt f a -> Alt f b -> Alt f b # (<*) :: Alt f a -> Alt f b -> Alt f a #
Applicative f => Applicative (Rec1 f)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Methods pure :: a -> Rec1 f a # (<>) :: Rec1 f (a -> b) -> Rec1 f a -> Rec1 f b # liftA2 :: (a -> b -> c) -> Rec1 f a -> Rec1 f b -> Rec1 f c # (>) :: Rec1 f a -> Rec1 f b -> Rec1 f b # (<*) :: Rec1 f a -> Rec1 f b -> Rec1 f a #
Applicative (Mag a b)
Instance details Defined in Data.Biapplicative Methods pure :: a0 -> Mag a b a0 # (<>) :: Mag a b (a0 -> b0) -> Mag a b a0 -> Mag a b b0 # liftA2 :: (a0 -> b0 -> c) -> Mag a b a0 -> Mag a b b0 -> Mag a b c # (>) :: Mag a b a0 -> Mag a b b0 -> Mag a b b0 # (<*) :: Mag a b a0 -> Mag a b b0 -> Mag a b a0 #
Biapplicative p => Applicative (Fix p)
Instance details Defined in Data.Bifunctor.Fix Methods pure :: a -> Fix p a # (<>) :: Fix p (a -> b) -> Fix p a -> Fix p b # liftA2 :: (a -> b -> c) -> Fix p a -> Fix p b -> Fix p c # (>) :: Fix p a -> Fix p b -> Fix p b # (<*) :: Fix p a -> Fix p b -> Fix p a #
Biapplicative p => Applicative (Join p)
Instance details Defined in Data.Bifunctor.Join Methods pure :: a -> Join p a # (<>) :: Join p (a -> b) -> Join p a -> Join p b # liftA2 :: (a -> b -> c) -> Join p a -> Join p b -> Join p c # (>) :: Join p a -> Join p b -> Join p b # (<*) :: Join p a -> Join p b -> Join p a #
Applicative w => Applicative (TracedT m w)
Instance details Defined in Control.Comonad.Trans.Traced Methods pure :: a -> TracedT m w a # (<>) :: TracedT m w (a -> b) -> TracedT m w a -> TracedT m w b # liftA2 :: (a -> b -> c) -> TracedT m w a -> TracedT m w b -> TracedT m w c # (>) :: TracedT m w a -> TracedT m w b -> TracedT m w b # (<*) :: TracedT m w a -> TracedT m w b -> TracedT m w a #
(Applicative f, Monad f) => Applicative (WhenMissing f x)	Equivalent to `ReaderT k (ReaderT x (MaybeT f))`. Since: containers-0.5.9
Instance details Defined in Data.IntMap.Internal Methods pure :: a -> WhenMissing f x a # (<>) :: WhenMissing f x (a -> b) -> WhenMissing f x a -> WhenMissing f x b # liftA2 :: (a -> b -> c) -> WhenMissing f x a -> WhenMissing f x b -> WhenMissing f x c # (>) :: WhenMissing f x a -> WhenMissing f x b -> WhenMissing f x b # (<*) :: WhenMissing f x a -> WhenMissing f x b -> WhenMissing f x a #
Applicative (Query v n)
Instance details Defined in Diagrams.Core.Query Methods pure :: a -> Query v n a # (<>) :: Query v n (a -> b) -> Query v n a -> Query v n b # liftA2 :: (a -> b -> c) -> Query v n a -> Query v n b -> Query v n c # (>) :: Query v n a -> Query v n b -> Query v n b # (<*) :: Query v n a -> Query v n b -> Query v n a #
Applicative g => Applicative (ApF f g)
Instance details Defined in Control.Applicative.Trans.Free Methods pure :: a -> ApF f g a # (<>) :: ApF f g (a -> b) -> ApF f g a -> ApF f g b # liftA2 :: (a -> b -> c) -> ApF f g a -> ApF f g b -> ApF f g c # (>) :: ApF f g a -> ApF f g b -> ApF f g b # (<*) :: ApF f g a -> ApF f g b -> ApF f g a #
Applicative g => Applicative (ApT f g)
Instance details Defined in Control.Applicative.Trans.Free Methods pure :: a -> ApT f g a # (<>) :: ApT f g (a -> b) -> ApT f g a -> ApT f g b # liftA2 :: (a -> b -> c) -> ApT f g a -> ApT f g b -> ApT f g c # (>) :: ApT f g a -> ApT f g b -> ApT f g b # (<*) :: ApT f g a -> ApT f g b -> ApT f g a #
(Alternative f, Applicative w) => Applicative (CofreeT f w)
Instance details Defined in Control.Comonad.Trans.Cofree Methods pure :: a -> CofreeT f w a # (<>) :: CofreeT f w (a -> b) -> CofreeT f w a -> CofreeT f w b # liftA2 :: (a -> b -> c) -> CofreeT f w a -> CofreeT f w b -> CofreeT f w c # (>) :: CofreeT f w a -> CofreeT f w b -> CofreeT f w b # (<*) :: CofreeT f w a -> CofreeT f w b -> CofreeT f w a #
(Functor f, Monad m) => Applicative (FreeT f m)
Instance details Defined in Control.Monad.Trans.Free Methods pure :: a -> FreeT f m a # (<>) :: FreeT f m (a -> b) -> FreeT f m a -> FreeT f m b # liftA2 :: (a -> b -> c) -> FreeT f m a -> FreeT f m b -> FreeT f m c # (>) :: FreeT f m a -> FreeT f m b -> FreeT f m b # (<*) :: FreeT f m a -> FreeT f m b -> FreeT f m a #
Applicative f => Applicative (Indexing f)
Instance details Defined in WithIndex Methods pure :: a -> Indexing f a # (<>) :: Indexing f (a -> b) -> Indexing f a -> Indexing f b # liftA2 :: (a -> b -> c) -> Indexing f a -> Indexing f b -> Indexing f c # (>) :: Indexing f a -> Indexing f b -> Indexing f b # (<*) :: Indexing f a -> Indexing f b -> Indexing f a #
(Applicative f, Applicative g) => Applicative (Day f g)
Instance details Defined in Data.Functor.Day Methods pure :: a -> Day f g a # (<>) :: Day f g (a -> b) -> Day f g a -> Day f g b # liftA2 :: (a -> b -> c) -> Day f g a -> Day f g b -> Day f g c # (>) :: Day f g a -> Day f g b -> Day f g b # (<*) :: Day f g a -> Day f g b -> Day f g a #
(Functor g, g ~ h) => Applicative (Curried g h)
Instance details Defined in Data.Functor.Day.Curried Methods pure :: a -> Curried g h a # (<>) :: Curried g h (a -> b) -> Curried g h a -> Curried g h b # liftA2 :: (a -> b -> c) -> Curried g h a -> Curried g h b -> Curried g h c # (>) :: Curried g h a -> Curried g h b -> Curried g h b # (<*) :: Curried g h a -> Curried g h b -> Curried g h a #
Applicative (Indexed i a)
Instance details Defined in Control.Lens.Internal.Indexed Methods pure :: a0 -> Indexed i a a0 # (<>) :: Indexed i a (a0 -> b) -> Indexed i a a0 -> Indexed i a b # liftA2 :: (a0 -> b -> c) -> Indexed i a a0 -> Indexed i a b -> Indexed i a c # (>) :: Indexed i a a0 -> Indexed i a b -> Indexed i a b # (<*) :: Indexed i a a0 -> Indexed i a b -> Indexed i a a0 #
Applicative (Flows i b)	This is an illegal `Applicative`.
Instance details Defined in Control.Lens.Internal.Level Methods pure :: a -> Flows i b a # (<>) :: Flows i b (a -> b0) -> Flows i b a -> Flows i b b0 # liftA2 :: (a -> b0 -> c) -> Flows i b a -> Flows i b b0 -> Flows i b c # (>) :: Flows i b a -> Flows i b b0 -> Flows i b b0 # (<*) :: Flows i b a -> Flows i b b0 -> Flows i b a #
Applicative (Mafic a b)
Instance details Defined in Control.Lens.Internal.Magma Methods pure :: a0 -> Mafic a b a0 # (<>) :: Mafic a b (a0 -> b0) -> Mafic a b a0 -> Mafic a b b0 # liftA2 :: (a0 -> b0 -> c) -> Mafic a b a0 -> Mafic a b b0 -> Mafic a b c # (>) :: Mafic a b a0 -> Mafic a b b0 -> Mafic a b b0 # (<*) :: Mafic a b a0 -> Mafic a b b0 -> Mafic a b a0 #
Monoid m => Applicative (Holes t m)
Instance details Defined in Control.Lens.Traversal Methods pure :: a -> Holes t m a # (<>) :: Holes t m (a -> b) -> Holes t m a -> Holes t m b # liftA2 :: (a -> b -> c) -> Holes t m a -> Holes t m b -> Holes t m c # (>) :: Holes t m a -> Holes t m b -> Holes t m b # (<*) :: Holes t m a -> Holes t m b -> Holes t m a #
Dim n => Applicative (V n)
Instance details Defined in Linear.V Methods pure :: a -> V n a # (<>) :: V n (a -> b) -> V n a -> V n b # liftA2 :: (a -> b -> c) -> V n a -> V n b -> V n c # (>) :: V n a -> V n b -> V n b # (<*) :: V n a -> V n b -> V n a #
(Profunctor p, Arrow p) => Applicative (Closure p a)
Instance details Defined in Data.Profunctor.Closed Methods pure :: a0 -> Closure p a a0 # (<>) :: Closure p a (a0 -> b) -> Closure p a a0 -> Closure p a b # liftA2 :: (a0 -> b -> c) -> Closure p a a0 -> Closure p a b -> Closure p a c # (>) :: Closure p a a0 -> Closure p a b -> Closure p a b # (<*) :: Closure p a a0 -> Closure p a b -> Closure p a a0 #
(Applicative (Rep p), Representable p) => Applicative (Prep p)
Instance details Defined in Data.Profunctor.Rep Methods pure :: a -> Prep p a # (<>) :: Prep p (a -> b) -> Prep p a -> Prep p b # liftA2 :: (a -> b -> c) -> Prep p a -> Prep p b -> Prep p c # (>) :: Prep p a -> Prep p b -> Prep p b # (<*) :: Prep p a -> Prep p b -> Prep p a #
(Profunctor p, Arrow p) => Applicative (Tambara p a)
Instance details Defined in Data.Profunctor.Strong Methods pure :: a0 -> Tambara p a a0 # (<>) :: Tambara p a (a0 -> b) -> Tambara p a a0 -> Tambara p a b # liftA2 :: (a0 -> b -> c) -> Tambara p a a0 -> Tambara p a b -> Tambara p a c # (>) :: Tambara p a a0 -> Tambara p a b -> Tambara p a b # (<*) :: Tambara p a a0 -> Tambara p a b -> Tambara p a a0 #
Applicative f => Applicative (Static f a)
Instance details Defined in Data.Semigroupoid.Static Methods pure :: a0 -> Static f a a0 # (<>) :: Static f a (a0 -> b) -> Static f a a0 -> Static f a b # liftA2 :: (a0 -> b -> c) -> Static f a a0 -> Static f a b -> Static f a c # (>) :: Static f a a0 -> Static f a b -> Static f a b # (<*) :: Static f a a0 -> Static f a b -> Static f a a0 #
Applicative (Tagged s)
Instance details Defined in Data.Tagged Methods pure :: a -> Tagged s a # (<>) :: Tagged s (a -> b) -> Tagged s a -> Tagged s b # liftA2 :: (a -> b -> c) -> Tagged s a -> Tagged s b -> Tagged s c # (>) :: Tagged s a -> Tagged s b -> Tagged s b # (<*) :: Tagged s a -> Tagged s b -> Tagged s a #
Applicative f => Applicative (Backwards f)	Apply `f`-actions in the reverse order.
Instance details Defined in Control.Applicative.Backwards Methods pure :: a -> Backwards f a # (<>) :: Backwards f (a -> b) -> Backwards f a -> Backwards f b # liftA2 :: (a -> b -> c) -> Backwards f a -> Backwards f b -> Backwards f c # (>) :: Backwards f a -> Backwards f b -> Backwards f b # (<*) :: Backwards f a -> Backwards f b -> Backwards f a #
(Functor m, Monad m) => Applicative (ErrorT e m)
Instance details Defined in Control.Monad.Trans.Error Methods pure :: a -> ErrorT e m a # (<>) :: ErrorT e m (a -> b) -> ErrorT e m a -> ErrorT e m b # liftA2 :: (a -> b -> c) -> ErrorT e m a -> ErrorT e m b -> ErrorT e m c # (>) :: ErrorT e m a -> ErrorT e m b -> ErrorT e m b # (<*) :: ErrorT e m a -> ErrorT e m b -> ErrorT e m a #
(Functor m, Monad m) => Applicative (ExceptT e m)
Instance details Defined in Control.Monad.Trans.Except Methods pure :: a -> ExceptT e m a # (<>) :: ExceptT e m (a -> b) -> ExceptT e m a -> ExceptT e m b # liftA2 :: (a -> b -> c) -> ExceptT e m a -> ExceptT e m b -> ExceptT e m c # (>) :: ExceptT e m a -> ExceptT e m b -> ExceptT e m b # (<*) :: ExceptT e m a -> ExceptT e m b -> ExceptT e m a #
Applicative m => Applicative (IdentityT m)
Instance details Defined in Control.Monad.Trans.Identity Methods pure :: a -> IdentityT m a # (<>) :: IdentityT m (a -> b) -> IdentityT m a -> IdentityT m b # liftA2 :: (a -> b -> c) -> IdentityT m a -> IdentityT m b -> IdentityT m c # (>) :: IdentityT m a -> IdentityT m b -> IdentityT m b # (<*) :: IdentityT m a -> IdentityT m b -> IdentityT m a #
Applicative m => Applicative (ReaderT r m)
Instance details Defined in Control.Monad.Trans.Reader Methods pure :: a -> ReaderT r m a # (<>) :: ReaderT r m (a -> b) -> ReaderT r m a -> ReaderT r m b # liftA2 :: (a -> b -> c) -> ReaderT r m a -> ReaderT r m b -> ReaderT r m c # (>) :: ReaderT r m a -> ReaderT r m b -> ReaderT r m b # (<*) :: ReaderT r m a -> ReaderT r m b -> ReaderT r m a #
(Functor m, Monad m) => Applicative (StateT s m)
Instance details Defined in Control.Monad.Trans.State.Lazy Methods pure :: a -> StateT s m a # (<>) :: StateT s m (a -> b) -> StateT s m a -> StateT s m b # liftA2 :: (a -> b -> c) -> StateT s m a -> StateT s m b -> StateT s m c # (>) :: StateT s m a -> StateT s m b -> StateT s m b # (<*) :: StateT s m a -> StateT s m b -> StateT s m a #
(Functor m, Monad m) => Applicative (StateT s m)
Instance details Defined in Control.Monad.Trans.State.Strict Methods pure :: a -> StateT s m a # (<>) :: StateT s m (a -> b) -> StateT s m a -> StateT s m b # liftA2 :: (a -> b -> c) -> StateT s m a -> StateT s m b -> StateT s m c # (>) :: StateT s m a -> StateT s m b -> StateT s m b # (<*) :: StateT s m a -> StateT s m b -> StateT s m a #
(Monoid w, Applicative m) => Applicative (WriterT w m)
Instance details Defined in Control.Monad.Trans.Writer.Lazy Methods pure :: a -> WriterT w m a # (<>) :: WriterT w m (a -> b) -> WriterT w m a -> WriterT w m b # liftA2 :: (a -> b -> c) -> WriterT w m a -> WriterT w m b -> WriterT w m c # (>) :: WriterT w m a -> WriterT w m b -> WriterT w m b # (<*) :: WriterT w m a -> WriterT w m b -> WriterT w m a #
(Monoid w, Applicative m) => Applicative (WriterT w m)
Instance details Defined in Control.Monad.Trans.Writer.Strict Methods pure :: a -> WriterT w m a # (<>) :: WriterT w m (a -> b) -> WriterT w m a -> WriterT w m b # liftA2 :: (a -> b -> c) -> WriterT w m a -> WriterT w m b -> WriterT w m c # (>) :: WriterT w m a -> WriterT w m b -> WriterT w m b # (<*) :: WriterT w m a -> WriterT w m b -> WriterT w m a #
Monoid a => Applicative (Constant a :: Type -> Type)
Instance details Defined in Data.Functor.Constant Methods pure :: a0 -> Constant a a0 # (<>) :: Constant a (a0 -> b) -> Constant a a0 -> Constant a b # liftA2 :: (a0 -> b -> c) -> Constant a a0 -> Constant a b -> Constant a c # (>) :: Constant a a0 -> Constant a b -> Constant a b # (<*) :: Constant a a0 -> Constant a b -> Constant a a0 #
Applicative f => Applicative (Reverse f)	Derived instance.
Instance details Defined in Data.Functor.Reverse Methods pure :: a -> Reverse f a # (<>) :: Reverse f (a -> b) -> Reverse f a -> Reverse f b # liftA2 :: (a -> b -> c) -> Reverse f a -> Reverse f b -> Reverse f c # (>) :: Reverse f a -> Reverse f b -> Reverse f b # (<*) :: Reverse f a -> Reverse f b -> Reverse f a #
(Monoid a, Monoid b) => Applicative ((,,) a b)	Since: base-4.14.0.0
Instance details Defined in GHC.Base Methods pure :: a0 -> (a, b, a0) # (<>) :: (a, b, a0 -> b0) -> (a, b, a0) -> (a, b, b0) # liftA2 :: (a0 -> b0 -> c) -> (a, b, a0) -> (a, b, b0) -> (a, b, c) # (>) :: (a, b, a0) -> (a, b, b0) -> (a, b, b0) # (<*) :: (a, b, a0) -> (a, b, b0) -> (a, b, a0) #
(Applicative f, Applicative g) => Applicative (Product f g)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Product Methods pure :: a -> Product f g a # (<>) :: Product f g (a -> b) -> Product f g a -> Product f g b # liftA2 :: (a -> b -> c) -> Product f g a -> Product f g b -> Product f g c # (>) :: Product f g a -> Product f g b -> Product f g b # (<*) :: Product f g a -> Product f g b -> Product f g a #
(Applicative f, Applicative g) => Applicative (f :*: g)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Methods pure :: a -> (f :: g) a # (<>) :: (f :: g) (a -> b) -> (f :: g) a -> (f :: g) b # liftA2 :: (a -> b -> c) -> (f :: g) a -> (f :: g) b -> (f :: g) c # (>) :: (f :: g) a -> (f :: g) b -> (f :: g) b # (<) :: (f :: g) a -> (f :: g) b -> (f :: g) a #
Monoid c => Applicative (K1 i c :: Type -> Type)	Since: base-4.12.0.0
Instance details Defined in GHC.Generics Methods pure :: a -> K1 i c a # (<>) :: K1 i c (a -> b) -> K1 i c a -> K1 i c b # liftA2 :: (a -> b -> c0) -> K1 i c a -> K1 i c b -> K1 i c c0 # (>) :: K1 i c a -> K1 i c b -> K1 i c b # (<*) :: K1 i c a -> K1 i c b -> K1 i c a #
Applicative (Cokleisli w a)
Instance details Defined in Control.Comonad Methods pure :: a0 -> Cokleisli w a a0 # (<>) :: Cokleisli w a (a0 -> b) -> Cokleisli w a a0 -> Cokleisli w a b # liftA2 :: (a0 -> b -> c) -> Cokleisli w a a0 -> Cokleisli w a b -> Cokleisli w a c # (>) :: Cokleisli w a a0 -> Cokleisli w a b -> Cokleisli w a b # (<*) :: Cokleisli w a a0 -> Cokleisli w a b -> Cokleisli w a a0 #
(Monad f, Applicative f) => Applicative (WhenMatched f x y)	Equivalent to `ReaderT Key (ReaderT x (ReaderT y (MaybeT f)))` Since: containers-0.5.9
Instance details Defined in Data.IntMap.Internal Methods pure :: a -> WhenMatched f x y a # (<>) :: WhenMatched f x y (a -> b) -> WhenMatched f x y a -> WhenMatched f x y b # liftA2 :: (a -> b -> c) -> WhenMatched f x y a -> WhenMatched f x y b -> WhenMatched f x y c # (>) :: WhenMatched f x y a -> WhenMatched f x y b -> WhenMatched f x y b # (<*) :: WhenMatched f x y a -> WhenMatched f x y b -> WhenMatched f x y a #
(Applicative f, Monad f) => Applicative (WhenMissing f k x)	Equivalent to `ReaderT k (ReaderT x (MaybeT f))` . Since: containers-0.5.9
Instance details Defined in Data.Map.Internal Methods pure :: a -> WhenMissing f k x a # (<>) :: WhenMissing f k x (a -> b) -> WhenMissing f k x a -> WhenMissing f k x b # liftA2 :: (a -> b -> c) -> WhenMissing f k x a -> WhenMissing f k x b -> WhenMissing f k x c # (>) :: WhenMissing f k x a -> WhenMissing f k x b -> WhenMissing f k x b # (<*) :: WhenMissing f k x a -> WhenMissing f k x b -> WhenMissing f k x a #
Applicative (Bazaar p a b)
Instance details Defined in Control.Lens.Internal.Bazaar Methods pure :: a0 -> Bazaar p a b a0 # (<>) :: Bazaar p a b (a0 -> b0) -> Bazaar p a b a0 -> Bazaar p a b b0 # liftA2 :: (a0 -> b0 -> c) -> Bazaar p a b a0 -> Bazaar p a b b0 -> Bazaar p a b c # (>) :: Bazaar p a b a0 -> Bazaar p a b b0 -> Bazaar p a b b0 # (<*) :: Bazaar p a b a0 -> Bazaar p a b b0 -> Bazaar p a b a0 #
Applicative (Molten i a b)
Instance details Defined in Control.Lens.Internal.Magma Methods pure :: a0 -> Molten i a b a0 # (<>) :: Molten i a b (a0 -> b0) -> Molten i a b a0 -> Molten i a b b0 # liftA2 :: (a0 -> b0 -> c) -> Molten i a b a0 -> Molten i a b b0 -> Molten i a b c # (>) :: Molten i a b a0 -> Molten i a b b0 -> Molten i a b b0 # (<*) :: Molten i a b a0 -> Molten i a b b0 -> Molten i a b a0 #
Applicative (Costar f a)
Instance details Defined in Data.Profunctor.Types Methods pure :: a0 -> Costar f a a0 # (<>) :: Costar f a (a0 -> b) -> Costar f a a0 -> Costar f a b # liftA2 :: (a0 -> b -> c) -> Costar f a a0 -> Costar f a b -> Costar f a c # (>) :: Costar f a a0 -> Costar f a b -> Costar f a b # (<*) :: Costar f a a0 -> Costar f a b -> Costar f a a0 #
Applicative f => Applicative (Star f a)
Instance details Defined in Data.Profunctor.Types Methods pure :: a0 -> Star f a a0 # (<>) :: Star f a (a0 -> b) -> Star f a a0 -> Star f a b # liftA2 :: (a0 -> b -> c) -> Star f a a0 -> Star f a b -> Star f a c # (>) :: Star f a a0 -> Star f a b -> Star f a b # (<*) :: Star f a a0 -> Star f a b -> Star f a a0 #
Applicative (ContT r m)
Instance details Defined in Control.Monad.Trans.Cont Methods pure :: a -> ContT r m a # (<>) :: ContT r m (a -> b) -> ContT r m a -> ContT r m b # liftA2 :: (a -> b -> c) -> ContT r m a -> ContT r m b -> ContT r m c # (>) :: ContT r m a -> ContT r m b -> ContT r m b # (<*) :: ContT r m a -> ContT r m b -> ContT r m a #
(Monoid a, Monoid b, Monoid c) => Applicative ((,,,) a b c)	Since: base-4.14.0.0
Instance details Defined in GHC.Base Methods pure :: a0 -> (a, b, c, a0) # (<>) :: (a, b, c, a0 -> b0) -> (a, b, c, a0) -> (a, b, c, b0) # liftA2 :: (a0 -> b0 -> c0) -> (a, b, c, a0) -> (a, b, c, b0) -> (a, b, c, c0) # (>) :: (a, b, c, a0) -> (a, b, c, b0) -> (a, b, c, b0) # (<*) :: (a, b, c, a0) -> (a, b, c, b0) -> (a, b, c, a0) #
Applicative ((->) r)	Since: base-2.1
Instance details Defined in GHC.Base Methods pure :: a -> r -> a # (<>) :: (r -> (a -> b)) -> (r -> a) -> r -> b # liftA2 :: (a -> b -> c) -> (r -> a) -> (r -> b) -> r -> c # (>) :: (r -> a) -> (r -> b) -> r -> b # (<*) :: (r -> a) -> (r -> b) -> r -> a #
(Applicative f, Applicative g) => Applicative (Compose f g)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Compose Methods pure :: a -> Compose f g a # (<>) :: Compose f g (a -> b) -> Compose f g a -> Compose f g b # liftA2 :: (a -> b -> c) -> Compose f g a -> Compose f g b -> Compose f g c # (>) :: Compose f g a -> Compose f g b -> Compose f g b # (<*) :: Compose f g a -> Compose f g b -> Compose f g a #
(Applicative f, Applicative g) => Applicative (f :.: g)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Methods pure :: a -> (f :.: g) a # (<>) :: (f :.: g) (a -> b) -> (f :.: g) a -> (f :.: g) b # liftA2 :: (a -> b -> c) -> (f :.: g) a -> (f :.: g) b -> (f :.: g) c # (>) :: (f :.: g) a -> (f :.: g) b -> (f :.: g) b # (<*) :: (f :.: g) a -> (f :.: g) b -> (f :.: g) a #
Applicative f => Applicative (M1 i c f)	Since: base-4.9.0.0
Instance details Defined in GHC.Generics Methods pure :: a -> M1 i c f a # (<>) :: M1 i c f (a -> b) -> M1 i c f a -> M1 i c f b # liftA2 :: (a -> b -> c0) -> M1 i c f a -> M1 i c f b -> M1 i c f c0 # (>) :: M1 i c f a -> M1 i c f b -> M1 i c f b # (<*) :: M1 i c f a -> M1 i c f b -> M1 i c f a #
(Monad f, Applicative f) => Applicative (WhenMatched f k x y)	Equivalent to `ReaderT k (ReaderT x (ReaderT y (MaybeT f)))` Since: containers-0.5.9
Instance details Defined in Data.Map.Internal Methods pure :: a -> WhenMatched f k x y a # (<>) :: WhenMatched f k x y (a -> b) -> WhenMatched f k x y a -> WhenMatched f k x y b # liftA2 :: (a -> b -> c) -> WhenMatched f k x y a -> WhenMatched f k x y b -> WhenMatched f k x y c # (>) :: WhenMatched f k x y a -> WhenMatched f k x y b -> WhenMatched f k x y b # (<*) :: WhenMatched f k x y a -> WhenMatched f k x y b -> WhenMatched f k x y a #
Applicative (BazaarT p g a b)
Instance details Defined in Control.Lens.Internal.Bazaar Methods pure :: a0 -> BazaarT p g a b a0 # (<>) :: BazaarT p g a b (a0 -> b0) -> BazaarT p g a b a0 -> BazaarT p g a b b0 # liftA2 :: (a0 -> b0 -> c) -> BazaarT p g a b a0 -> BazaarT p g a b b0 -> BazaarT p g a b c # (>) :: BazaarT p g a b a0 -> BazaarT p g a b b0 -> BazaarT p g a b b0 # (<*) :: BazaarT p g a b a0 -> BazaarT p g a b b0 -> BazaarT p g a b a0 #
Applicative (TakingWhile p f a b)
Instance details Defined in Control.Lens.Internal.Magma Methods pure :: a0 -> TakingWhile p f a b a0 # (<>) :: TakingWhile p f a b (a0 -> b0) -> TakingWhile p f a b a0 -> TakingWhile p f a b b0 # liftA2 :: (a0 -> b0 -> c) -> TakingWhile p f a b a0 -> TakingWhile p f a b b0 -> TakingWhile p f a b c # (>) :: TakingWhile p f a b a0 -> TakingWhile p f a b b0 -> TakingWhile p f a b b0 # (<*) :: TakingWhile p f a b a0 -> TakingWhile p f a b b0 -> TakingWhile p f a b a0 #
Reifies s (ReifiedApplicative f) => Applicative (ReflectedApplicative f s)
Instance details Defined in Data.Reflection Methods pure :: a -> ReflectedApplicative f s a # (<>) :: ReflectedApplicative f s (a -> b) -> ReflectedApplicative f s a -> ReflectedApplicative f s b # liftA2 :: (a -> b -> c) -> ReflectedApplicative f s a -> ReflectedApplicative f s b -> ReflectedApplicative f s c # (>) :: ReflectedApplicative f s a -> ReflectedApplicative f s b -> ReflectedApplicative f s b # (<*) :: ReflectedApplicative f s a -> ReflectedApplicative f s b -> ReflectedApplicative f s a #
(Monoid w, Functor m, Monad m) => Applicative (RWST r w s m)
Instance details Defined in Control.Monad.Trans.RWS.Lazy Methods pure :: a -> RWST r w s m a # (<>) :: RWST r w s m (a -> b) -> RWST r w s m a -> RWST r w s m b # liftA2 :: (a -> b -> c) -> RWST r w s m a -> RWST r w s m b -> RWST r w s m c # (>) :: RWST r w s m a -> RWST r w s m b -> RWST r w s m b # (<*) :: RWST r w s m a -> RWST r w s m b -> RWST r w s m a #
(Monoid w, Functor m, Monad m) => Applicative (RWST r w s m)
Instance details Defined in Control.Monad.Trans.RWS.Strict Methods pure :: a -> RWST r w s m a # (<>) :: RWST r w s m (a -> b) -> RWST r w s m a -> RWST r w s m b # liftA2 :: (a -> b -> c) -> RWST r w s m a -> RWST r w s m b -> RWST r w s m c # (>) :: RWST r w s m a -> RWST r w s m b -> RWST r w s m b # (<*) :: RWST r w s m a -> RWST r w s m b -> RWST r w s m a #

(*>) :: Applicative f => f a -> f b -> f b infixl 4 #

Sequence actions, discarding the value of the first argument.

Examples

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If used in conjunction with the Applicative instance for Maybe, you can chain Maybe computations, with a possible "early return" in case of Nothing.

>>> Just 2 *> Just 3
Just 3

>>> Nothing *> Just 3
Nothing

Of course a more interesting use case would be to have effectful computations instead of just returning pure values.

>>> import Data.Char
>>> import Text.ParserCombinators.ReadP
>>> let p = string "my name is " *> munch1 isAlpha <* eof
>>> readP_to_S p "my name is Simon"
[("Simon","")]

(<*) :: Applicative f => f a -> f b -> f a infixl 4 #

Sequence actions, discarding the value of the second argument.

(<$>) :: Functor f => (a -> b) -> f a -> f b infixl 4 #

An infix synonym for fmap.

The name of this operator is an allusion to $. Note the similarities between their types:

 ($)  ::              (a -> b) ->   a ->   b
(<$>) :: Functor f => (a -> b) -> f a -> f b

Whereas $ is function application, <$> is function application lifted over a Functor.

Examples

Expand

Convert from a Maybe Int to a Maybe String using show:

>>> show <$> Nothing
Nothing
>>> show <$> Just 3
Just "3"

Convert from an Either Int Int to an Either Int String using show:

>>> show <$> Left 17
Left 17
>>> show <$> Right 17
Right "17"

Double each element of a list:

>>> (*2) <$> [1,2,3]
[2,4,6]

Apply even to the second element of a pair:

>>> even <$> (2,2)
(2,True)

(<$) :: Functor f => a -> f b -> f a infixl 4 #

Replace all locations in the input with the same value. The default definition is fmap . const, but this may be overridden with a more efficient version.

liftA :: Applicative f => (a -> b) -> f a -> f b #

Lift a function to actions. Equivalent to Functor's fmap but implemented using only Applicative's methods: `liftA f a = pure f * a`

As such this function may be used to implement a Functor instance from an Applicative one.

liftA2 :: Applicative f => (a -> b -> c) -> f a -> f b -> f c #

Lift a binary function to actions.

Some functors support an implementation of liftA2 that is more efficient than the default one. In particular, if fmap is an expensive operation, it is likely better to use liftA2 than to fmap over the structure and then use <*>.

This became a typeclass method in 4.10.0.0. Prior to that, it was a function defined in terms of <*> and fmap.

Example

Expand

>>> liftA2 (,) (Just 3) (Just 5)
Just (3,5)

liftA3 :: Applicative f => (a -> b -> c -> d) -> f a -> f b -> f c -> f d #

Lift a ternary function to actions.