Copyright	(C) 2007-2015 Edward Kmett
License	BSD-style (see the file LICENSE)
Maintainer	Edward Kmett <ekmett@gmail.com>
Stability	provisional
Portability	portable
Safe Haskell	Safe
Language	Haskell2010

Data.Semigroupoid.Dual

Description

A semigroupoid satisfies all of the requirements to be a Category except for the existence of identity arrows.

Documentation

newtype Dual k a b Source #

Constructors

Dual
Fields getDual :: k b a

Instances details

Category k2 => Category (Dual k2 :: k1 -> k1 -> Type) Source #
Instance details Defined in Data.Semigroupoid.Dual Methods id :: forall (a :: k). Dual k2 a a # (.) :: forall (b :: k) (c :: k) (a :: k). Dual k2 b c -> Dual k2 a b -> Dual k2 a c #
Semigroupoid k2 => Semigroupoid (Dual k2 :: k1 -> k1 -> Type) Source #
Instance details Defined in Data.Semigroupoid.Dual Methods o :: forall (j :: k) (k :: k) (i :: k). Dual k2 j k -> Dual k2 i j -> Dual k2 i k Source #
Groupoid k2 => Groupoid (Dual k2 :: k1 -> k1 -> Type) Source #
Instance details Defined in Data.Groupoid Methods inv :: forall (a :: k) (b :: k). Dual k2 a b -> Dual k2 b a Source #