Data.Validity

Validity is used to specify additional invariants upon values that are not enforced by the type system.

Let's take an example. Suppose we were to implement a type Prime that represents prime integers.

If you were to completely enforce the invariant that the represented number is a prime, then we could use Natural and only store the index of the given prime in the infinite sequence of prime numbers. This is very safe but also very expensive if we ever want to use the number, because we would have to calculcate all the prime numbers until that index.

Instead we choose to implement Prime by a newtype Prime = Prime Int. Now we have to maintain the invariant that the Int that we use to represent the prime is in fact positive and a prime.

The Validity typeclass allows us to specify this invariant (and enables testing via the genvalidity libraries: https://hackage.haskell.org/package/genvalidity ):

instance Validity Prime where
    validate (Prime n) = check (isPrime n) "The 'Int' is prime."

If certain typeclass invariants exist, you can make these explicit in the validity instance as well. For example, 'Fixed a' is only valid if a has an HasResolution instance, so the correct validity instance is HasResolution a => Validity (Fixed a).

Documentation

class Validity a where

A class of types that have additional invariants defined upon them

Minimal complete definition

Nothing

Methods

validate :: a -> Validation

validate :: (Generic a, GValidity (Rep a)) => a -> Validation

Instances

Validity Bool

Trivially valid

Defined in Data.Validity

Methods

validate :: Bool -> Validation

Validity Char

Trivially valid

Defined in Data.Validity

Methods

validate :: Char -> Validation

Validity Double

Trivially valid:

Defined in Data.Validity

Methods

validate :: Double -> Validation

Validity Float

Trivially valid:

Defined in Data.Validity

Methods

validate :: Float -> Validation

Validity Int

Trivially valid

Defined in Data.Validity

Methods

validate :: Int -> Validation

Validity Int8

Trivially valid

Defined in Data.Validity

Methods

validate :: Int8 -> Validation

Validity Int16

Trivially valid

Defined in Data.Validity

Methods

validate :: Int16 -> Validation

Validity Int32

Trivially valid

Defined in Data.Validity

Methods

validate :: Int32 -> Validation

Validity Int64

Trivially valid

Defined in Data.Validity

Methods

validate :: Int64 -> Validation

Validity Integer

Trivially valid

Integer is not trivially valid under the hood, but instantiating Validity correctly would force validity to depend on a specific (big integer library integer-gmp versus integer-simple). This is rather impractical so for the time being we have opted for assuming that an Integer is always valid. Even though this is not technically sound, it is good enough for now.

Defined in Data.Validity

Methods

validate :: Integer -> Validation

Validity Natural

Valid according to isValidNatural

Only available with base >= 4.8.

Defined in Data.Validity

Methods

validate :: Natural -> Validation

Validity Ordering

Trivially valid

Defined in Data.Validity

Methods

validate :: Ordering -> Validation

Validity Word

Trivially valid

Defined in Data.Validity

Methods

validate :: Word -> Validation

Validity Word8

Trivially valid

Defined in Data.Validity

Methods

validate :: Word8 -> Validation

Validity Word16

Trivially valid

Defined in Data.Validity

Methods

validate :: Word16 -> Validation

Validity Word32

Trivially valid

Defined in Data.Validity

Methods

validate :: Word32 -> Validation

Validity Word64

Trivially valid

Defined in Data.Validity

Methods

validate :: Word64 -> Validation

Validity ()

Trivially valid

Defined in Data.Validity

Methods

validate :: () -> Validation

Validity ValidationChain

Defined in Data.Validity

Methods

validate :: ValidationChain -> Validation

Validity a => Validity [a]

A list of things is valid if all of the things are valid.

This means that the empty list is considered valid. If the empty list should not be considered valid as part of your custom data type, make sure to write a custom Validity instance

Defined in Data.Validity

Methods

validate :: [a] -> Validation

Validity a => Validity (Maybe a)

A Maybe thing is valid if the thing inside is valid or it's nothing It makes sense to assume that Nothing is valid. If Nothing wasn't valid, you wouldn't have used a Maybe in the datastructure.

Defined in Data.Validity

Methods

validate :: Maybe a -> Validation

(Validity a, Ord a, Num a, Integral a) => Validity (Ratio a)

Valid if the contained numbers are valid and the denominator is strictly positive.

Defined in Data.Validity

Methods

validate :: Ratio a -> Validation

HasResolution a => Validity (Fixed a)

Valid according to the contained Integer.

Defined in Data.Validity

Methods

validate :: Fixed a -> Validation

Validity a => Validity (NonEmpty a)

A nonempty list is valid if all the elements are valid.

See the instance for 'Validity [a]' for more information.

Defined in Data.Validity

Methods

validate :: NonEmpty a -> Validation

(Validity a, Validity b) => Validity (Either a b)

Any Either of things is valid if the contents are valid in either of the cases.

Defined in Data.Validity

Methods

validate :: Either a b -> Validation

(Validity a, Validity b) => Validity (a, b)

Any tuple of things is valid if both of its elements are valid

Defined in Data.Validity

Methods

validate :: (a, b) -> Validation

(Validity a, Validity b, Validity c) => Validity (a, b, c)

Any triple of things is valid if all three of its elements are valid

Defined in Data.Validity

Methods

validate :: (a, b, c) -> Validation

(Validity a, Validity b, Validity c, Validity d) => Validity (a, b, c, d)

Any quadruple of things is valid if all four of its elements are valid

Defined in Data.Validity

Methods

validate :: (a, b, c, d) -> Validation

(Validity a, Validity b, Validity c, Validity d, Validity e) => Validity (a, b, c, d, e)

Any quintuple of things is valid if all five of its elements are valid

Defined in Data.Validity

Methods

validate :: (a, b, c, d, e) -> Validation

(Validity a, Validity b, Validity c, Validity d, Validity e, Validity f) => Validity (a, b, c, d, e, f)

Any sextuple of things is valid if all six of its elements are valid

Defined in Data.Validity

Methods

validate :: (a, b, c, d, e, f) -> Validation

Helper functions to define validate

trivialValidation :: a -> Validation

Declare any value to be valid in validation

trivialValidation a = seq a mempty

genericValidate :: (Generic a, GValidity (Rep a)) => a -> Validation

check :: Bool -> String -> Validation

Check that a given invariant holds.

The given string should describe the invariant, not the violation.

Example:

check (x < 5) "x is strictly smaller than 5"

instead of

check (x < 5) "x is greater than 5"

declare :: String -> Bool -> Validation

check, but with the arguments flipped

annotate :: Validity a => a -> String -> Validation

Declare a sub-part as a necessary part for validation, and annotate it with a name.

Example:

validate (a, b) =
    mconcat
        [ annotate a "The first element of the tuple"
        , annotate b "The second element of the tuple"
        ]

delve :: Validity a => String -> a -> Validation

annotate, but with the arguments flipped.

decorate :: String -> Validation -> Validation

Decorate a validation with a location

decorateList :: [a] -> (a -> Validation) -> Validation

Decorate a piecewise validation of a list with their location in the list

invalid :: String -> Validation

Construct a trivially invalid Validation

Example:

data Wrong
    = Wrong
    | Fine
    deriving (Show, Eq)

instance Validity Wrong where
    validate w =
        case w of
            Wrong -> invalid "Wrong"
            Fine -> valid

valid :: Validation

Helpers for specific types

Char

validateCharNotUtf16SurrogateCodePoint :: Char -> Validation

isUtf16SurrogateCodePoint :: Char -> Bool

RealFloat (Double)

validateNotNaN :: RealFloat a => a -> Validation

validateNotInfinite :: RealFloat a => a -> Validation

Ratio

validateRatioNotNaN :: Integral a => Ratio a -> Validation

validateRatioNotInfinite :: Integral a => Ratio a -> Validation

validateRatioNormalised :: Integral a => Ratio a -> Validation

Utilities

Utilities for validity checking

isValid :: Validity a => a -> Bool

Check whether a value is valid.

isInvalid :: Validity a => a -> Bool

Check whether a value is not valid.

isInvalid = not . isValid

constructValid :: Validity a => a -> Maybe a

Construct a valid element from an unchecked element

constructValidUnsafe :: (Show a, Validity a) => a -> a

Construct a valid element from an unchecked element, throwing error on invalid elements.

Utilities for validation

newtype Validation

The result of validating a value.

mempty means the value was valid.

This type intentionally doesn't have a Validity instance to make sure you can never accidentally use annotate or delve twice.

Constructors

Validation

Fields

• unValidation :: [ValidationChain]

Instances

Eq Validation

Defined in Data.Validity

Methods

(==) :: Validation -> Validation -> Bool

(/=) :: Validation -> Validation -> Bool

Show Validation

Defined in Data.Validity

Methods

showsPrec :: Int -> Validation -> ShowS

show :: Validation -> String

showList :: [Validation] -> ShowS

Generic Validation

Defined in Data.Validity

Associated Types

type Rep Validation :: Type -> Type

Methods

from :: Validation -> Rep Validation x

to :: Rep Validation x -> Validation

Semigroup Validation

Defined in Data.Validity

Methods

(<>) :: Validation -> Validation -> Validation

sconcat :: NonEmpty Validation -> Validation

stimes :: Integral b => b -> Validation -> Validation

Monoid Validation

Defined in Data.Validity

Methods

mempty :: Validation

mappend :: Validation -> Validation -> Validation

mconcat :: [Validation] -> Validation

type Rep Validation

Defined in Data.Validity

type Rep Validation = D1 (MetaData "Validation" "Data.Validity" "validity-0.9.0.3-4C20nMGz5mPJx03kCOo2IE" True) (C1 (MetaCons "Validation" PrefixI True) (S1 (MetaSel (Just "unValidation") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 [ValidationChain])))

data ValidationChain

Constructors

Violated String

Location String ValidationChain

Instances

Eq ValidationChain

Defined in Data.Validity

Methods

(==) :: ValidationChain -> ValidationChain -> Bool

(/=) :: ValidationChain -> ValidationChain -> Bool

Show ValidationChain

Defined in Data.Validity

Methods

showsPrec :: Int -> ValidationChain -> ShowS

show :: ValidationChain -> String

showList :: [ValidationChain] -> ShowS

Generic ValidationChain

Defined in Data.Validity

Associated Types

type Rep ValidationChain :: Type -> Type

Methods

from :: ValidationChain -> Rep ValidationChain x

to :: Rep ValidationChain x -> ValidationChain

Validity ValidationChain

Defined in Data.Validity

Methods

validate :: ValidationChain -> Validation

type Rep ValidationChain

Defined in Data.Validity

type Rep ValidationChain = D1 (MetaData "ValidationChain" "Data.Validity" "validity-0.9.0.3-4C20nMGz5mPJx03kCOo2IE" False) (C1 (MetaCons "Violated" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 String)) :+: C1 (MetaCons "Location" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 String) :*: S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 ValidationChain)))

checkValidity :: Validity a => a -> Either [ValidationChain] a

validate a given value.

This function returns either all the reasons why the given value is invalid, in the form of a list of ValidationChains, or it returns Right with the input value, as evidence that it is valid.

Note: You may want to use prettyValidation instead, if you want to display these ValidationChains to a user.

validationIsValid :: Validation -> Bool

Check if a Validation concerns a valid value.

prettyValidate :: Validity a => a -> Either String a

Validate a given value

This function will return a nice error if the value is invalid. It will return the original value in Right if it was valid, as evidence that it has been validated.

prettyValidation :: Validation -> Maybe String

Render a Validation in a somewhat pretty way.

This function will return Nothing if the Validation concerned a valid value.

Re-exports

class Semigroup a => Monoid a where

The class of monoids (types with an associative binary operation that has an identity). Instances should satisfy the following laws:

• x <> mempty = x

• mempty <> x = x

• x <> (y <> z) = (x <> y) <> z (Semigroup law)

• mconcat = foldr '(<>)' mempty

The method names refer to the monoid of lists under concatenation, but there are many other instances.

Some types can be viewed as a monoid in more than one way, e.g. both addition and multiplication on numbers. In such cases we often define newtypes and make those instances of Monoid, e.g. Sum and Product.

NOTE: Semigroup is a superclass of Monoid since base-4.11.0.0.

Minimal complete definition

mempty

Methods

mempty :: a

Identity of mappend

mappend :: a -> a -> a

An associative operation

NOTE: This method is redundant and has the default implementation mappend = '(<>)' since base-4.11.0.0.

mconcat :: [a] -> a

Fold a list using the monoid.

For most types, the default definition for mconcat will be used, but the function is included in the class definition so that an optimized version can be provided for specific types.

Instances

Monoid Ordering

Since: base-2.1

Defined in GHC.Base

Methods

mempty :: Ordering

mappend :: Ordering -> Ordering -> Ordering

mconcat :: [Ordering] -> Ordering

Monoid ()

Since: base-2.1

Defined in GHC.Base

Methods

mempty :: ()

mappend :: () -> () -> ()

mconcat :: [()] -> ()

Monoid All

Since: base-2.1

Defined in Data.Semigroup.Internal

Methods

mempty :: All

mappend :: All -> All -> All

mconcat :: [All] -> All

Monoid Any

Since: base-2.1

Defined in Data.Semigroup.Internal

Methods

mempty :: Any

mappend :: Any -> Any -> Any

mconcat :: [Any] -> Any

Monoid Validation

Defined in Data.Validity

Methods

mempty :: Validation

mappend :: Validation -> Validation -> Validation

mconcat :: [Validation] -> Validation

Monoid [a]

Since: base-2.1

Defined in GHC.Base

Methods

mempty :: [a]

mappend :: [a] -> [a] -> [a]

mconcat :: [[a]] -> [a]

Semigroup a => Monoid (Maybe a)

Lift a semigroup into Maybe forming a Monoid according to http://en.wikipedia.org/wiki/Monoid: "Any semigroup S may be turned into a monoid simply by adjoining an element e not in S and defining e*e = e and e*s = s = s*e for all s ∈ S."

Since 4.11.0: constraint on inner a value generalised from Monoid to Semigroup.

Since: base-2.1

Defined in GHC.Base

Methods

mempty :: Maybe a

mappend :: Maybe a -> Maybe a -> Maybe a

mconcat :: [Maybe a] -> Maybe a

Monoid a => Monoid (IO a)

Since: base-4.9.0.0

Defined in GHC.Base

Methods

mempty :: IO a

mappend :: IO a -> IO a -> IO a

mconcat :: [IO a] -> IO a

Monoid p => Monoid (Par1 p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

mempty :: Par1 p

mappend :: Par1 p -> Par1 p -> Par1 p

mconcat :: [Par1 p] -> Par1 p

Monoid a => Monoid (Identity a)

Since: base-4.9.0.0

Defined in Data.Functor.Identity

Methods

mempty :: Identity a

mappend :: Identity a -> Identity a -> Identity a

mconcat :: [Identity a] -> Identity a

Monoid (First a)

Since: base-2.1

Defined in Data.Monoid

Methods

mempty :: First a

mappend :: First a -> First a -> First a

mconcat :: [First a] -> First a

Monoid (Last a)

Since: base-2.1

Defined in Data.Monoid

Methods

mempty :: Last a

mappend :: Last a -> Last a -> Last a

mconcat :: [Last a] -> Last a

Monoid a => Monoid (Dual a)

Since: base-2.1

Defined in Data.Semigroup.Internal

Methods

mempty :: Dual a

mappend :: Dual a -> Dual a -> Dual a

mconcat :: [Dual a] -> Dual a

Monoid (Endo a)

Since: base-2.1

Defined in Data.Semigroup.Internal

Methods

mempty :: Endo a

mappend :: Endo a -> Endo a -> Endo a

mconcat :: [Endo a] -> Endo a

Num a => Monoid (Sum a)

Since: base-2.1

Defined in Data.Semigroup.Internal

Methods

mempty :: Sum a

mappend :: Sum a -> Sum a -> Sum a

mconcat :: [Sum a] -> Sum a

Num a => Monoid (Product a)

Since: base-2.1

Defined in Data.Semigroup.Internal

Methods

mempty :: Product a

mappend :: Product a -> Product a -> Product a

mconcat :: [Product a] -> Product a

Monoid a => Monoid (Down a)

Since: base-4.11.0.0

Defined in Data.Ord

Methods

mempty :: Down a

mappend :: Down a -> Down a -> Down a

mconcat :: [Down a] -> Down a

Monoid b => Monoid (a -> b)

Since: base-2.1

Defined in GHC.Base

Methods

mempty :: a -> b

mappend :: (a -> b) -> (a -> b) -> a -> b

mconcat :: [a -> b] -> a -> b

Monoid (U1 p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

mempty :: U1 p

mappend :: U1 p -> U1 p -> U1 p

mconcat :: [U1 p] -> U1 p

(Monoid a, Monoid b) => Monoid (a, b)

Since: base-2.1

Defined in GHC.Base

Methods

mempty :: (a, b)

mappend :: (a, b) -> (a, b) -> (a, b)

mconcat :: [(a, b)] -> (a, b)

Monoid (Proxy s)

Since: base-4.7.0.0

Defined in Data.Proxy

Methods

mempty :: Proxy s

mappend :: Proxy s -> Proxy s -> Proxy s

mconcat :: [Proxy s] -> Proxy s

Monoid (f p) => Monoid (Rec1 f p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

mempty :: Rec1 f p

mappend :: Rec1 f p -> Rec1 f p -> Rec1 f p

mconcat :: [Rec1 f p] -> Rec1 f p

(Monoid a, Monoid b, Monoid c) => Monoid (a, b, c)

Since: base-2.1

Defined in GHC.Base

Methods

mempty :: (a, b, c)

mappend :: (a, b, c) -> (a, b, c) -> (a, b, c)

mconcat :: [(a, b, c)] -> (a, b, c)

Monoid a => Monoid (Const a b)

Since: base-4.9.0.0

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

(Applicative f, Monoid a) => Monoid (Ap f a)

Since: base-4.12.0.0

Defined in Data.Monoid

Methods

mempty :: Ap f a

mappend :: Ap f a -> Ap f a -> Ap f a

mconcat :: [Ap f a] -> Ap f a

Alternative f => Monoid (Alt f a)

Since: base-4.8.0.0

Defined in Data.Semigroup.Internal

Methods

mempty :: Alt f a

mappend :: Alt f a -> Alt f a -> Alt f a

mconcat :: [Alt f a] -> Alt f a

Monoid c => Monoid (K1 i c p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

mempty :: K1 i c p

mappend :: K1 i c p -> K1 i c p -> K1 i c p

mconcat :: [K1 i c p] -> K1 i c p

(Monoid (f p), Monoid (g p)) => Monoid ((f :*: g) p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

mempty :: (f :*: g) p

mappend :: (f :*: g) p -> (f :*: g) p -> (f :*: g) p

mconcat :: [(f :*: g) p] -> (f :*: g) p

(Monoid a, Monoid b, Monoid c, Monoid d) => Monoid (a, b, c, d)

Since: base-2.1

Defined in GHC.Base

Methods

mempty :: (a, b, c, d)

mappend :: (a, b, c, d) -> (a, b, c, d) -> (a, b, c, d)

mconcat :: [(a, b, c, d)] -> (a, b, c, d)

Monoid (f p) => Monoid (M1 i c f p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

mempty :: M1 i c f p

mappend :: M1 i c f p -> M1 i c f p -> M1 i c f p

mconcat :: [M1 i c f p] -> M1 i c f p

Monoid (f (g p)) => Monoid ((f :.: g) p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

mempty :: (f :.: g) p

mappend :: (f :.: g) p -> (f :.: g) p -> (f :.: g) p

mconcat :: [(f :.: g) p] -> (f :.: g) p

(Monoid a, Monoid b, Monoid c, Monoid d, Monoid e) => Monoid (a, b, c, d, e)

Since: base-2.1

Defined in GHC.Base

Methods

mempty :: (a, b, c, d, e)

mappend :: (a, b, c, d, e) -> (a, b, c, d, e) -> (a, b, c, d, e)

mconcat :: [(a, b, c, d, e)] -> (a, b, c, d, e)

class Semigroup a where

The class of semigroups (types with an associative binary operation).

Instances should satisfy the associativity law:

• x <> (y <> z) = (x <> y) <> z

Since: base-4.9.0.0

Methods

(<>) :: a -> a -> a infixr 6

An associative operation.

Instances

Semigroup Ordering

Since: base-4.9.0.0

Defined in GHC.Base

Methods

(<>) :: Ordering -> Ordering -> Ordering

sconcat :: NonEmpty Ordering -> Ordering

stimes :: Integral b => b -> Ordering -> Ordering

Semigroup ()

Since: base-4.9.0.0

Defined in GHC.Base

Methods

(<>) :: () -> () -> ()

sconcat :: NonEmpty () -> ()

stimes :: Integral b => b -> () -> ()

Semigroup All

Since: base-4.9.0.0

Defined in Data.Semigroup.Internal

Methods

(<>) :: All -> All -> All

sconcat :: NonEmpty All -> All

stimes :: Integral b => b -> All -> All

Semigroup Any

Since: base-4.9.0.0

Defined in Data.Semigroup.Internal

Methods

(<>) :: Any -> Any -> Any

sconcat :: NonEmpty Any -> Any

stimes :: Integral b => b -> Any -> Any

Semigroup Validation

Defined in Data.Validity

Methods

(<>) :: Validation -> Validation -> Validation

sconcat :: NonEmpty Validation -> Validation

stimes :: Integral b => b -> Validation -> Validation

Semigroup [a]

Since: base-4.9.0.0

Defined in GHC.Base

Methods

(<>) :: [a] -> [a] -> [a]

sconcat :: NonEmpty [a] -> [a]

stimes :: Integral b => b -> [a] -> [a]

Semigroup a => Semigroup (Maybe a)

Since: base-4.9.0.0

Defined in GHC.Base

Methods

(<>) :: Maybe a -> Maybe a -> Maybe a

sconcat :: NonEmpty (Maybe a) -> Maybe a

stimes :: Integral b => b -> Maybe a -> Maybe a

Semigroup a => Semigroup (IO a)

Since: base-4.10.0.0

Defined in GHC.Base

Methods

(<>) :: IO a -> IO a -> IO a

sconcat :: NonEmpty (IO a) -> IO a

stimes :: Integral b => b -> IO a -> IO a

Semigroup p => Semigroup (Par1 p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

(<>) :: Par1 p -> Par1 p -> Par1 p

sconcat :: NonEmpty (Par1 p) -> Par1 p

stimes :: Integral b => b -> Par1 p -> Par1 p

Semigroup a => Semigroup (Identity a)

Since: base-4.9.0.0

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

Semigroup (First a)

Since: base-4.9.0.0

Defined in Data.Monoid

Methods

(<>) :: First a -> First a -> First a

sconcat :: NonEmpty (First a) -> First a

stimes :: Integral b => b -> First a -> First a

Semigroup (Last a)

Since: base-4.9.0.0

Defined in Data.Monoid

Methods

(<>) :: Last a -> Last a -> Last a

sconcat :: NonEmpty (Last a) -> Last a

stimes :: Integral b => b -> Last a -> Last a

Semigroup a => Semigroup (Dual a)

Since: base-4.9.0.0

Defined in Data.Semigroup.Internal

Methods

(<>) :: Dual a -> Dual a -> Dual a

sconcat :: NonEmpty (Dual a) -> Dual a

stimes :: Integral b => b -> Dual a -> Dual a

Semigroup (Endo a)

Since: base-4.9.0.0

Defined in Data.Semigroup.Internal

Methods

(<>) :: Endo a -> Endo a -> Endo a

sconcat :: NonEmpty (Endo a) -> Endo a

stimes :: Integral b => b -> Endo a -> Endo a

Num a => Semigroup (Sum a)

Since: base-4.9.0.0

Defined in Data.Semigroup.Internal

Methods

(<>) :: Sum a -> Sum a -> Sum a

sconcat :: NonEmpty (Sum a) -> Sum a

stimes :: Integral b => b -> Sum a -> Sum a

Num a => Semigroup (Product a)

Since: base-4.9.0.0

Defined in Data.Semigroup.Internal

Methods

(<>) :: Product a -> Product a -> Product a

sconcat :: NonEmpty (Product a) -> Product a

stimes :: Integral b => b -> Product a -> Product a

Semigroup a => Semigroup (Down a)

Since: base-4.11.0.0

Defined in Data.Ord

Methods

(<>) :: Down a -> Down a -> Down a

sconcat :: NonEmpty (Down a) -> Down a

stimes :: Integral b => b -> Down a -> Down a

Semigroup (NonEmpty a)

Since: base-4.9.0.0

Defined in GHC.Base

Methods

(<>) :: NonEmpty a -> NonEmpty a -> NonEmpty a

sconcat :: NonEmpty (NonEmpty a) -> NonEmpty a

stimes :: Integral b => b -> NonEmpty a -> NonEmpty a

Semigroup b => Semigroup (a -> b)

Since: base-4.9.0.0

Defined in GHC.Base

Methods

(<>) :: (a -> b) -> (a -> b) -> a -> b

sconcat :: NonEmpty (a -> b) -> a -> b

stimes :: Integral b0 => b0 -> (a -> b) -> a -> b

Semigroup (Either a b)

Since: base-4.9.0.0

Defined in Data.Either

Methods

(<>) :: Either a b -> Either a b -> Either a b

sconcat :: NonEmpty (Either a b) -> Either a b

stimes :: Integral b0 => b0 -> Either a b -> Either a b

Semigroup (V1 p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

(<>) :: V1 p -> V1 p -> V1 p

sconcat :: NonEmpty (V1 p) -> V1 p

stimes :: Integral b => b -> V1 p -> V1 p

Semigroup (U1 p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

(<>) :: U1 p -> U1 p -> U1 p

sconcat :: NonEmpty (U1 p) -> U1 p

stimes :: Integral b => b -> U1 p -> U1 p

(Semigroup a, Semigroup b) => Semigroup (a, b)

Since: base-4.9.0.0

Defined in GHC.Base

Methods

(<>) :: (a, b) -> (a, b) -> (a, b)

sconcat :: NonEmpty (a, b) -> (a, b)

stimes :: Integral b0 => b0 -> (a, b) -> (a, b)

Semigroup (Proxy s)

Since: base-4.9.0.0

Defined in Data.Proxy

Methods

(<>) :: Proxy s -> Proxy s -> Proxy s

sconcat :: NonEmpty (Proxy s) -> Proxy s

stimes :: Integral b => b -> Proxy s -> Proxy s

Semigroup (f p) => Semigroup (Rec1 f p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

(<>) :: Rec1 f p -> Rec1 f p -> Rec1 f p

sconcat :: NonEmpty (Rec1 f p) -> Rec1 f p

stimes :: Integral b => b -> Rec1 f p -> Rec1 f p

(Semigroup a, Semigroup b, Semigroup c) => Semigroup (a, b, c)

Since: base-4.9.0.0

Defined in GHC.Base

Methods

(<>) :: (a, b, c) -> (a, b, c) -> (a, b, c)

sconcat :: NonEmpty (a, b, c) -> (a, b, c)

stimes :: Integral b0 => b0 -> (a, b, c) -> (a, b, c)

Semigroup a => Semigroup (Const a b)

Since: base-4.9.0.0

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

(Applicative f, Semigroup a) => Semigroup (Ap f a)

Since: base-4.12.0.0

Defined in Data.Monoid

Methods

(<>) :: Ap f a -> Ap f a -> Ap f a

sconcat :: NonEmpty (Ap f a) -> Ap f a

stimes :: Integral b => b -> Ap f a -> Ap f a

Alternative f => Semigroup (Alt f a)

Since: base-4.9.0.0

Defined in Data.Semigroup.Internal

Methods

(<>) :: Alt f a -> Alt f a -> Alt f a

sconcat :: NonEmpty (Alt f a) -> Alt f a

stimes :: Integral b => b -> Alt f a -> Alt f a

Semigroup c => Semigroup (K1 i c p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

(<>) :: K1 i c p -> K1 i c p -> K1 i c p

sconcat :: NonEmpty (K1 i c p) -> K1 i c p

stimes :: Integral b => b -> K1 i c p -> K1 i c p

(Semigroup (f p), Semigroup (g p)) => Semigroup ((f :*: g) p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

(<>) :: (f :*: g) p -> (f :*: g) p -> (f :*: g) p

sconcat :: NonEmpty ((f :*: g) p) -> (f :*: g) p

stimes :: Integral b => b -> (f :*: g) p -> (f :*: g) p

(Semigroup a, Semigroup b, Semigroup c, Semigroup d) => Semigroup (a, b, c, d)

Since: base-4.9.0.0

Defined in GHC.Base

Methods

(<>) :: (a, b, c, d) -> (a, b, c, d) -> (a, b, c, d)

sconcat :: NonEmpty (a, b, c, d) -> (a, b, c, d)

stimes :: Integral b0 => b0 -> (a, b, c, d) -> (a, b, c, d)

Semigroup (f p) => Semigroup (M1 i c f p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

(<>) :: M1 i c f p -> M1 i c f p -> M1 i c f p

sconcat :: NonEmpty (M1 i c f p) -> M1 i c f p

stimes :: Integral b => b -> M1 i c f p -> M1 i c f p

Semigroup (f (g p)) => Semigroup ((f :.: g) p)

Since: base-4.12.0.0

Defined in GHC.Generics

Methods

(<>) :: (f :.: g) p -> (f :.: g) p -> (f :.: g) p

sconcat :: NonEmpty ((f :.: g) p) -> (f :.: g) p

stimes :: Integral b => b -> (f :.: g) p -> (f :.: g) p

(Semigroup a, Semigroup b, Semigroup c, Semigroup d, Semigroup e) => Semigroup (a, b, c, d, e)

Since: base-4.9.0.0

Defined in GHC.Base

Methods

(<>) :: (a, b, c, d, e) -> (a, b, c, d, e) -> (a, b, c, d, e)

sconcat :: NonEmpty (a, b, c, d, e) -> (a, b, c, d, e)

stimes :: Integral b0 => b0 -> (a, b, c, d, e) -> (a, b, c, d, e)