Copyright | (c) Ross Paterson 2010 |
---|---|
License | BSD-style (see the file LICENSE) |
Maintainer | R.Paterson@city.ac.uk |
Stability | experimental |
Portability | portable |
Safe Haskell | Trustworthy |
Language | Haskell98 |
Data.Functor.Compose
Description
Composition of functors.
- newtype Compose f g a = Compose {
- getCompose :: f (g a)
Documentation
newtype Compose f g a infixr 9
Right-to-left composition of functors. The composition of applicative functors is always applicative, but the composition of monads is not always a monad.
Constructors
Compose infixr 9 | |
Fields
|
Instances
(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) | |
Functor f => Generic1 (Compose * * f g) | |
(Alternative f, Applicative g) => Alternative (Compose * * f g) | |
(Show1 f, Show1 g) => Show1 (Compose * * f g) | |
(Read1 f, Read1 g) => Read1 (Compose * * f g) | |
(Ord1 f, Ord1 g) => Ord1 (Compose * * f g) | |
(Eq1 f, Eq1 g) => Eq1 (Compose * * f g) | |
(Eq1 f, Eq1 g, Eq a) => Eq (Compose * * f g a) | |
(Data (f (g a)), Typeable (* -> *) f, Typeable (* -> *) g, Typeable * a) => Data (Compose * * f g a) | |
(Ord1 f, Ord1 g, Ord a) => Ord (Compose * * f g a) | |
(Read1 f, Read1 g, Read a) => Read (Compose * * f g a) | |
(Show1 f, Show1 g, Show a) => Show (Compose * * f g a) | |
Generic (Compose k k f g a) | |
type Rep1 (Compose * * f g) | |
type Rep (Compose k k1 f g a) |