Safe Haskell	Safe-Inferred
Language	Haskell2010

Data.Tuple.Optics

Contents

Tuples
Strict variations

Description

This module defines Lenses for the fields of tuple types. These are overloaded using the Field1 to Field9 typeclasses, so that _1 can be used as a Lens for the first field of a tuple with any number of fields (up to the maximum supported tuple size, which is currently 9). For example:

>>> view _1 ('a','b','c')
'a'

>>> set _3 True ('a','b','c')
('a','b',True)

If a datatype has a Generic instance, the corresponding FieldN instances can be defined using their default methods:

>>> :set -XDeriveGeneric
>>> import GHC.Generics (Generic)
>>> data T a b = MkT a Int b deriving (Generic, Show)
>>> instance Field1 (T a c) (T b c) a b
>>> instance Field2 (T a b) (T a b) Int Int
>>> instance Field3 (T c a) (T c b) a b

>>> set _3 'x' (MkT False 1 ())
MkT False 1 'x'

For a generalization of this pattern see GPosition.

Synopsis

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
_1' :: Field1 s t a b => Lens s t a b
_2' :: Field2 s t a b => Lens s t a b
_3' :: Field3 s t a b => Lens s t a b
_4' :: Field4 s t a b => Lens s t a b
_5' :: Field5 s t a b => Lens s t a b
_6' :: Field6 s t a b => Lens s t a b
_7' :: Field7 s t a b => Lens s t a b
_8' :: Field8 s t a b => Lens s t a b
_9' :: Field9 s t a b => Lens s t a b

Tuples

class Field1 s t a b | s -> a, t -> b, s b -> t, t a -> s where Source #

Provides access to 1st field of a tuple.

Minimal complete definition

Nothing

Methods

_1 :: Lens s t a b Source #

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

>>> (1,2) ^. _1
1

>>> (1,2) & _1 .~ "hello"
("hello",2)

>>> traverseOf _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)

default _1 :: GPosition 1 s t a b => Lens s t a b Source #

Instances

Instances details

Field1 (Identity a) (Identity b) a b Source #
Instance details Defined in Data.Tuple.Optics Methods _1 :: Lens (Identity a) (Identity b) a b Source #
Field1 (a, b) (a', b) a a' Source #
Instance details Defined in Data.Tuple.Optics Methods _1 :: Lens (a, b) (a', b) a a' Source #
Field1 (a, b, c) (a', b, c) a a' Source #
Instance details Defined in Data.Tuple.Optics Methods _1 :: Lens (a, b, c) (a', b, c) a a' Source #
Field1 (a, b, c, d) (a', b, c, d) a a' Source #
Instance details Defined in Data.Tuple.Optics Methods _1 :: Lens (a, b, c, d) (a', b, c, d) a a' Source #
Field1 (Product f g a) (Product f' g a) (f a) (f' a) Source #
Instance details Defined in Data.Tuple.Optics Methods _1 :: Lens (Product f g a) (Product f' g a) (f a) (f' a) Source #
Field1 ((f :: g) p) ((f' :: g) p) (f p) (f' p) Source #
Instance details Defined in Data.Tuple.Optics Methods _1 :: Lens ((f :: g) p) ((f' :: g) p) (f p) (f' p) Source #
Field1 (a, b, c, d, e) (a', b, c, d, e) a a' Source #
Instance details Defined in Data.Tuple.Optics Methods _1 :: Lens (a, b, c, d, e) (a', b, c, d, e) a a' Source #
Field1 (a, b, c, d, e, f) (a', b, c, d, e, f) a a' Source #
Instance details Defined in Data.Tuple.Optics Methods _1 :: Lens (a, b, c, d, e, f) (a', b, c, d, e, f) a a' Source #
Field1 (a, b, c, d, e, f, g) (a', b, c, d, e, f, g) a a' Source #
Instance details Defined in Data.Tuple.Optics Methods _1 :: Lens (a, b, c, d, e, f, g) (a', b, c, d, e, f, g) a a' Source #
Field1 (a, b, c, d, e, f, g, h) (a', b, c, d, e, f, g, h) a a' Source #
Instance details Defined in Data.Tuple.Optics Methods _1 :: Lens (a, b, c, d, e, f, g, h) (a', b, c, d, e, f, g, h) a a' Source #
Field1 (a, b, c, d, e, f, g, h, i) (a', b, c, d, e, f, g, h, i) a a' Source #
Instance details Defined in Data.Tuple.Optics Methods _1 :: Lens (a, b, c, d, e, f, g, h, i) (a', b, c, d, e, f, g, h, i) a a' Source #

class Field2 s t a b | s -> a, t -> b, s b -> t, t a -> s where Source #

Provides access to the 2nd field of a tuple.

Minimal complete definition

Nothing

Methods

_2 :: Lens s t a b Source #

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)

>>> traverseOf _2 print (1,2)
2
(1,())

default _2 :: GPosition 2 s t a b => Lens s t a b Source #

Instances

Instances details

Field2 (a, b) (a, b') b b' Source #
Instance details Defined in Data.Tuple.Optics Methods _2 :: Lens (a, b) (a, b') b b' Source #
Field2 (a, b, c) (a, b', c) b b' Source #
Instance details Defined in Data.Tuple.Optics Methods _2 :: Lens (a, b, c) (a, b', c) b b' Source #
Field2 (a, b, c, d) (a, b', c, d) b b' Source #
Instance details Defined in Data.Tuple.Optics Methods _2 :: Lens (a, b, c, d) (a, b', c, d) b b' Source #
Field2 (Product f g a) (Product f g' a) (g a) (g' a) Source #
Instance details Defined in Data.Tuple.Optics Methods _2 :: Lens (Product f g a) (Product f g' a) (g a) (g' a) Source #
Field2 ((f :: g) p) ((f :: g') p) (g p) (g' p) Source #
Instance details Defined in Data.Tuple.Optics Methods _2 :: Lens ((f :: g) p) ((f :: g') p) (g p) (g' p) Source #
Field2 (a, b, c, d, e) (a, b', c, d, e) b b' Source #
Instance details Defined in Data.Tuple.Optics Methods _2 :: Lens (a, b, c, d, e) (a, b', c, d, e) b b' Source #
Field2 (a, b, c, d, e, f) (a, b', c, d, e, f) b b' Source #
Instance details Defined in Data.Tuple.Optics Methods _2 :: Lens (a, b, c, d, e, f) (a, b', c, d, e, f) b b' Source #
Field2 (a, b, c, d, e, f, g) (a, b', c, d, e, f, g) b b' Source #
Instance details Defined in Data.Tuple.Optics Methods _2 :: Lens (a, b, c, d, e, f, g) (a, b', c, d, e, f, g) b b' Source #
Field2 (a, b, c, d, e, f, g, h) (a, b', c, d, e, f, g, h) b b' Source #
Instance details Defined in Data.Tuple.Optics Methods _2 :: Lens (a, b, c, d, e, f, g, h) (a, b', c, d, e, f, g, h) b b' Source #
Field2 (a, b, c, d, e, f, g, h, i) (a, b', c, d, e, f, g, h, i) b b' Source #
Instance details Defined in Data.Tuple.Optics Methods _2 :: Lens (a, b, c, d, e, f, g, h, i) (a, b', c, d, e, f, g, h, i) b b' Source #

class Field3 s t a b | s -> a, t -> b, s b -> t, t a -> s where Source #

Provides access to the 3rd field of a tuple.

Minimal complete definition

Nothing

Methods

_3 :: Lens s t a b Source #

Access the 3rd field of a tuple.

default _3 :: GPosition 3 s t a b => Lens s t a b Source #

Instances

Instances details

Field3 (a, b, c) (a, b, c') c c' Source #
Instance details Defined in Data.Tuple.Optics Methods _3 :: Lens (a, b, c) (a, b, c') c c' Source #
Field3 (a, b, c, d) (a, b, c', d) c c' Source #
Instance details Defined in Data.Tuple.Optics Methods _3 :: Lens (a, b, c, d) (a, b, c', d) c c' Source #
Field3 (a, b, c, d, e) (a, b, c', d, e) c c' Source #
Instance details Defined in Data.Tuple.Optics Methods _3 :: Lens (a, b, c, d, e) (a, b, c', d, e) c c' Source #
Field3 (a, b, c, d, e, f) (a, b, c', d, e, f) c c' Source #
Instance details Defined in Data.Tuple.Optics Methods _3 :: Lens (a, b, c, d, e, f) (a, b, c', d, e, f) c c' Source #
Field3 (a, b, c, d, e, f, g) (a, b, c', d, e, f, g) c c' Source #
Instance details Defined in Data.Tuple.Optics Methods _3 :: Lens (a, b, c, d, e, f, g) (a, b, c', d, e, f, g) c c' Source #
Field3 (a, b, c, d, e, f, g, h) (a, b, c', d, e, f, g, h) c c' Source #
Instance details Defined in Data.Tuple.Optics Methods _3 :: Lens (a, b, c, d, e, f, g, h) (a, b, c', d, e, f, g, h) c c' Source #
Field3 (a, b, c, d, e, f, g, h, i) (a, b, c', d, e, f, g, h, i) c c' Source #
Instance details Defined in Data.Tuple.Optics Methods _3 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c', d, e, f, g, h, i) c c' Source #

class Field4 s t a b | s -> a, t -> b, s b -> t, t a -> s where Source #

Provide access to the 4th field of a tuple.

Minimal complete definition

Nothing

Methods

_4 :: Lens s t a b Source #

Access the 4th field of a tuple.

default _4 :: GPosition 4 s t a b => Lens s t a b Source #

Instances

Instances details

Field4 (a, b, c, d) (a, b, c, d') d d' Source #
Instance details Defined in Data.Tuple.Optics Methods _4 :: Lens (a, b, c, d) (a, b, c, d') d d' Source #
Field4 (a, b, c, d, e) (a, b, c, d', e) d d' Source #
Instance details Defined in Data.Tuple.Optics Methods _4 :: Lens (a, b, c, d, e) (a, b, c, d', e) d d' Source #
Field4 (a, b, c, d, e, f) (a, b, c, d', e, f) d d' Source #
Instance details Defined in Data.Tuple.Optics Methods _4 :: Lens (a, b, c, d, e, f) (a, b, c, d', e, f) d d' Source #
Field4 (a, b, c, d, e, f, g) (a, b, c, d', e, f, g) d d' Source #
Instance details Defined in Data.Tuple.Optics Methods _4 :: Lens (a, b, c, d, e, f, g) (a, b, c, d', e, f, g) d d' Source #
Field4 (a, b, c, d, e, f, g, h) (a, b, c, d', e, f, g, h) d d' Source #
Instance details Defined in Data.Tuple.Optics Methods _4 :: Lens (a, b, c, d, e, f, g, h) (a, b, c, d', e, f, g, h) d d' Source #
Field4 (a, b, c, d, e, f, g, h, i) (a, b, c, d', e, f, g, h, i) d d' Source #
Instance details Defined in Data.Tuple.Optics Methods _4 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c, d', e, f, g, h, i) d d' Source #

class Field5 s t a b | s -> a, t -> b, s b -> t, t a -> s where Source #

Provides access to the 5th field of a tuple.

Minimal complete definition

Nothing

Methods

_5 :: Lens s t a b Source #

Access the 5th field of a tuple.

default _5 :: GPosition 5 s t a b => Lens s t a b Source #

Instances

Instances details

Field5 (a, b, c, d, e) (a, b, c, d, e') e e' Source #
Instance details Defined in Data.Tuple.Optics Methods _5 :: Lens (a, b, c, d, e) (a, b, c, d, e') e e' Source #
Field5 (a, b, c, d, e, f) (a, b, c, d, e', f) e e' Source #
Instance details Defined in Data.Tuple.Optics Methods _5 :: Lens (a, b, c, d, e, f) (a, b, c, d, e', f) e e' Source #
Field5 (a, b, c, d, e, f, g) (a, b, c, d, e', f, g) e e' Source #
Instance details Defined in Data.Tuple.Optics Methods _5 :: Lens (a, b, c, d, e, f, g) (a, b, c, d, e', f, g) e e' Source #
Field5 (a, b, c, d, e, f, g, h) (a, b, c, d, e', f, g, h) e e' Source #
Instance details Defined in Data.Tuple.Optics Methods _5 :: Lens (a, b, c, d, e, f, g, h) (a, b, c, d, e', f, g, h) e e' Source #
Field5 (a, b, c, d, e, f, g, h, i) (a, b, c, d, e', f, g, h, i) e e' Source #
Instance details Defined in Data.Tuple.Optics Methods _5 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c, d, e', f, g, h, i) e e' Source #

class Field6 s t a b | s -> a, t -> b, s b -> t, t a -> s where Source #

Provides access to the 6th element of a tuple.

Minimal complete definition

Nothing

Methods

_6 :: Lens s t a b Source #

Access the 6th field of a tuple.

default _6 :: GPosition 6 s t a b => Lens s t a b Source #

Instances

Instances details

Field6 (a, b, c, d, e, f) (a, b, c, d, e, f') f f' Source #
Instance details Defined in Data.Tuple.Optics Methods _6 :: Lens (a, b, c, d, e, f) (a, b, c, d, e, f') f f' Source #
Field6 (a, b, c, d, e, f, g) (a, b, c, d, e, f', g) f f' Source #
Instance details Defined in Data.Tuple.Optics Methods _6 :: Lens (a, b, c, d, e, f, g) (a, b, c, d, e, f', g) f f' Source #
Field6 (a, b, c, d, e, f, g, h) (a, b, c, d, e, f', g, h) f f' Source #
Instance details Defined in Data.Tuple.Optics Methods _6 :: Lens (a, b, c, d, e, f, g, h) (a, b, c, d, e, f', g, h) f f' Source #
Field6 (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f', g, h, i) f f' Source #
Instance details Defined in Data.Tuple.Optics Methods _6 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f', g, h, i) f f' Source #

class Field7 s t a b | s -> a, t -> b, s b -> t, t a -> s where Source #

Provide access to the 7th field of a tuple.

Minimal complete definition

Nothing

Methods

_7 :: Lens s t a b Source #

Access the 7th field of a tuple.

default _7 :: GPosition 7 s t a b => Lens s t a b Source #

Instances

Instances details

Field7 (a, b, c, d, e, f, g) (a, b, c, d, e, f, g') g g' Source #
Instance details Defined in Data.Tuple.Optics Methods _7 :: Lens (a, b, c, d, e, f, g) (a, b, c, d, e, f, g') g g' Source #
Field7 (a, b, c, d, e, f, g, h) (a, b, c, d, e, f, g', h) g g' Source #
Instance details Defined in Data.Tuple.Optics Methods _7 :: Lens (a, b, c, d, e, f, g, h) (a, b, c, d, e, f, g', h) g g' Source #
Field7 (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f, g', h, i) g g' Source #
Instance details Defined in Data.Tuple.Optics Methods _7 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f, g', h, i) g g' Source #

class Field8 s t a b | s -> a, t -> b, s b -> t, t a -> s where Source #

Provide access to the 8th field of a tuple.

Minimal complete definition

Nothing

Methods

_8 :: Lens s t a b Source #

Access the 8th field of a tuple.

default _8 :: GPosition 8 s t a b => Lens s t a b Source #

Instances

Instances details

Field8 (a, b, c, d, e, f, g, h) (a, b, c, d, e, f, g, h') h h' Source #
Instance details Defined in Data.Tuple.Optics Methods _8 :: Lens (a, b, c, d, e, f, g, h) (a, b, c, d, e, f, g, h') h h' Source #
Field8 (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f, g, h', i) h h' Source #
Instance details Defined in Data.Tuple.Optics Methods _8 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f, g, h', i) h h' Source #

class Field9 s t a b | s -> a, t -> b, s b -> t, t a -> s where Source #

Provides access to the 9th field of a tuple.

Minimal complete definition

Nothing

Methods

_9 :: Lens s t a b Source #

Access the 9th field of a tuple.

default _9 :: GPosition 9 s t a b => Lens s t a b Source #

Instances

Instances details

Field9 (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f, g, h, i') i i' Source #
Instance details Defined in Data.Tuple.Optics Methods _9 :: Lens (a, b, c, d, e, f, g, h, i) (a, b, c, d, e, f, g, h, i') i i' Source #

Strict variations

_1' :: Field1 s t a b => Lens s t a b Source #

Strict version of _1

_2' :: Field2 s t a b => Lens s t a b Source #

Strict version of _2

_3' :: Field3 s t a b => Lens s t a b Source #

Strict version of _3

_4' :: Field4 s t a b => Lens s t a b Source #

Strict version of _4

_5' :: Field5 s t a b => Lens s t a b Source #

Strict version of _5

_6' :: Field6 s t a b => Lens s t a b Source #

Strict version of _6

_7' :: Field7 s t a b => Lens s t a b Source #

Strict version of _7

_8' :: Field8 s t a b => Lens s t a b Source #

Strict version of _8

_9' :: Field9 s t a b => Lens s t a b Source #

Strict version of _9