lens-3.5.1: Lenses, Folds and Traversals

Portability Rank2Types provisional Edward Kmett Safe-Inferred

Control.Lens.Tuple

Contents

Description

Synopsis

• class Field1 s t a b | s -> a, t -> b, s b -> t, t a -> s where
• class Field2 s t a b | s -> a, t -> b, s b -> t, t a -> s where
• class Field3 s t a b | s -> a, t -> b, s b -> t, t a -> s where
• class Field4 s t a b | s -> a, t -> b, s b -> t, t a -> s where
• class Field5 s t a b | s -> a, t -> b, s b -> t, t a -> s where
• class Field6 s t a b | s -> a, t -> b, s b -> t, t a -> s where
• class Field7 s t a b | s -> a, t -> b, s b -> t, t a -> s where
• class Field8 s t a b | s -> a, t -> b, s b -> t, t a -> s where
• class Field9 s t a b | s -> a, t -> b, s b -> t, t a -> s where

# Tuples

class Field1 s t a b | s -> a, t -> b, s b -> t, t a -> s whereSource

Methods

_1 :: Lens s t a bSource

Access the 1st field of a tuple (and possibly change its type).

>>> (1,2)^._1
1
>>> _1 .~ "hello" \$ (1,2)
("hello",2)

This can also be used on larger tuples as well

>>> _1 +~ 41 \$ (1,2,3,4,5)
(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,c,d,e,f,g,h,i) (a',b,c,d,e,f,g,h,i) a a'

Instances

 Field1 (a, b) (a', b) a a' Field1 (a, b, c) (a', b, c) a a' Field1 (a, b, c, d) (a', b, c, d) a a' Field1 (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' Field1 (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' Field1 (a, b, c, d, e, f, g, h, i) (a', b, c, d, e, f, g, h, i) a a'

class Field2 s t a b | s -> a, t -> b, s b -> t, t a -> s whereSource

Methods

_2 :: Lens s t a bSource

Access the 2nd field of a tuple

>>> _2 .~ "hello" \$ (1,(),3,4)
(1,"hello",3,4)
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

 Field2 (a, b) (a, b') b b' Field2 (a, b, c) (a, b', c) b b' Field2 (a, b, c, d) (a, b', c, d) b b' Field2 (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' Field2 (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' Field2 (a, b, c, d, e, f, g, h, i) (a, b', c, d, e, f, g, h, i) b b'

class Field3 s t a b | s -> a, t -> b, s b -> t, t a -> s whereSource

Methods

_3 :: Lens s t a bSource

Access the 3rd field of a tuple

Instances

 Field3 (a, b, c) (a, b, c') c c' Field3 (a, b, c, d) (a, b, c', d) c c' Field3 (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' Field3 (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' Field3 (a, b, c, d, e, f, g, h, i) (a, b, c', d, e, f, g, h, i) c c'

class Field4 s t a b | s -> a, t -> b, s b -> t, t a -> s whereSource

Methods

_4 :: Lens s t a bSource

Access the 4th field of a tuple

Instances

 Field4 (a, b, c, d) (a, b, c, d') d d' Field4 (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' Field4 (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' Field4 (a, b, c, d, e, f, g, h, i) (a, b, c, d', e, f, g, h, i) d d'

class Field5 s t a b | s -> a, t -> b, s b -> t, t a -> s whereSource

Methods

_5 :: Lens s t a bSource

Access the 5th field of a tuple

Instances

 Field5 (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' Field5 (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' Field5 (a, b, c, d, e, f, g, h, i) (a, b, c, d, e', f, g, h, i) e e'

class Field6 s t a b | s -> a, t -> b, s b -> t, t a -> s whereSource

Methods

_6 :: Lens s t a bSource

Access the 6th field of a tuple

Instances

 Field6 (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' Field6 (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'

class Field7 s t a b | s -> a, t -> b, s b -> t, t a -> s whereSource

Methods

_7 :: Lens s t a bSource

Access the 7th field of a tuple

Instances

 Field7 (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' Field7 (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f, g', h, i) g g'

class Field8 s t a b | s -> a, t -> b, s b -> t, t a -> s whereSource

Methods

_8 :: Lens s t a bSource

Access the 8th field of a tuple

Instances

 Field8 (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'

class Field9 s t a b | s -> a, t -> b, s b -> t, t a -> s whereSource