Safe Haskell	Safe
Language	Haskell98

Data.Semifunctor

Synopsis

Documentation

class (Semigroupoid c, Semigroupoid d) => Semifunctor f c d | f c -> d, f d -> c where

Semifunctors map objects to objects, and arrows to arrows preserving connectivity as normal functors, but do not purport to preserve identity arrows. We apply them to semigroupoids, because those don't even claim to offer identity arrows!

Methods

semimap :: c a b -> d (f a) (f b)

Instances

Semifunctor f c d => Semifunctor f (Dual c) (Dual d)
Functor f => Semifunctor (WrappedFunctor f) (->) (->)
(Traversable1 f, Bind m) => Semifunctor (WrappedTraversable1 f) (Kleisli m) (Kleisli m)
(Distributive f, Extend w) => Semifunctor (WrappedFunctor f) (Cokleisli w) (Cokleisli w)
(Traversable f, Bind m, Monad m) => Semifunctor (WrappedFunctor f) (Kleisli m) (Kleisli m)
Semifunctor (Bi Either) (Product (->) (->)) (->)
Semifunctor (Bi (,)) (Product (->) (->)) (->)
Bind m => Semifunctor (Bi Either) (Product (Kleisli m) (Kleisli m)) (Kleisli m)
Bind m => Semifunctor (Bi (,)) (Product (Kleisli m) (Kleisli m)) (Kleisli m)
Extend w => Semifunctor (Bi (,)) (Product (Cokleisli w) (Cokleisli w)) (Cokleisli w)

data Bi p a where

Used to map a more traditional bifunctor into a semifunctor

Constructors

Bi :: p a b -> Bi p (a, b)

Instances

Disassociative (->) (Bi Either)
Disassociative (->) (Bi (,))
Associative (->) (Bi Either)
Associative (->) (Bi (,))
Symmetric (->) (Bi Either)
Symmetric (->) (Bi (,))
Braided (->) (Bi Either)
Braided (->) (Bi (,))
(Bind m, Monad m) => Disassociative (Kleisli m) (Bi (,))
(Bind m, Monad m) => Disassociative (Kleisli m) (Bi Either)
(Extend m, Comonad m) => Disassociative (Cokleisli m) (Bi (,))
(Bind m, Monad m) => Associative (Kleisli m) (Bi (,))
(Bind m, Monad m) => Associative (Kleisli m) (Bi Either)
(Extend m, Comonad m) => Associative (Cokleisli m) (Bi (,))
(Bind m, Monad m) => Symmetric (Kleisli m) (Bi (,))
(Bind m, Monad m) => Symmetric (Kleisli m) (Bi Either)
(Extend w, Comonad w) => Symmetric (Cokleisli w) (Bi (,))
(Bind m, Monad m) => Braided (Kleisli m) (Bi (,))
(Bind m, Monad m) => Braided (Kleisli m) (Bi Either)
(Extend w, Comonad w) => Braided (Cokleisli w) (Bi (,))
Semifunctor (Bi Either) (Product (->) (->)) (->)
Semifunctor (Bi (,)) (Product (->) (->)) (->)
Bind m => Semifunctor (Bi Either) (Product (Kleisli m) (Kleisli m)) (Kleisli m)
Bind m => Semifunctor (Bi (,)) (Product (Kleisli m) (Kleisli m)) (Kleisli m)
Extend w => Semifunctor (Bi (,)) (Product (Cokleisli w) (Cokleisli w)) (Cokleisli w)

(#) :: a -> b -> Bi (,) (a, b)

semibimap :: Semifunctor p (Product l r) cod => l a b -> r c d -> cod (p (a, c)) (p (b, d))

semifirst :: (Semifunctor p (Product l r) cod, Ob r c) => l a b -> cod (p (a, c)) (p (b, c))

semisecond :: (Semifunctor p (Product l r) cod, Ob l a) => r b c -> cod (p (a, b)) (p (a, c))

first :: (Semifunctor p (Product l r) cod, Category r) => l a b -> cod (p (a, c)) (p (b, c))

second :: (Semifunctor p (Product l r) cod, Category l) => r b c -> cod (p (a, b)) (p (a, c))

data WrappedFunctor f a

Constructors

WrapFunctor
Fields unwrapFunctor :: f a

Instances

Functor f => Semifunctor (WrappedFunctor f) (->) (->)
(Distributive f, Extend w) => Semifunctor (WrappedFunctor f) (Cokleisli w) (Cokleisli w)
(Traversable f, Bind m, Monad m) => Semifunctor (WrappedFunctor f) (Kleisli m) (Kleisli m)

data WrappedTraversable1 f a

Constructors

WrapTraversable1
Fields unwrapTraversable1 :: f a

Instances

(Traversable1 f, Bind m) => Semifunctor (WrappedTraversable1 f) (Kleisli m) (Kleisli m)

module Control.Category

module Data.Semigroupoid

module Data.Semigroupoid.Ob

module Data.Semigroupoid.Product