/Haskell 7


Copyright (c) Ross Paterson 2010
License BSD-style (see the file LICENSE)
Maintainer ross@soi.city.ac.uk
Stability experimental
Portability portable
Safe Haskell Safe
Language Haskell98


Composition of functors.

newtype Compose f g a infixr 9 Source

Right-to-left composition of functors. The composition of applicative functors is always applicative, but the composition of monads is not always a monad.


Compose infixr 9


getCompose :: f (g a)


(Functor f, Functor g) => Functor (Compose f g)
(Applicative f, Applicative g) => Applicative (Compose f g)
(Foldable f, Foldable g) => Foldable (Compose f g)
(Traversable f, Traversable g) => Traversable (Compose f g)
(Alternative f, Applicative g) => Alternative (Compose f g)
(Functor f, Show1 f, Show1 g) => Show1 (Compose f g)
(Functor f, Read1 f, Read1 g) => Read1 (Compose f g)
(Functor f, Ord1 f, Ord1 g) => Ord1 (Compose f g)
(Functor f, Eq1 f, Eq1 g) => Eq1 (Compose f g)
(Functor f, Eq1 f, Eq1 g, Eq a) => Eq (Compose f g a)
(Functor f, Ord1 f, Ord1 g, Ord a) => Ord (Compose f g a)
(Functor f, Read1 f, Read1 g, Read a) => Read (Compose f g a)
(Functor f, Show1 f, Show1 g, Show a) => Show (Compose f g a)

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Licensed under a BSD-style license (see top of the page).