Data.Functor.Contravariant.Compose

Description

Composition of contravariant functors.

Synopsis

Documentation

newtype Compose f g a Source #

Composition of two contravariant functors

Constructors

Compose
Fields getCompose :: f (g a)

Instances details

(Contravariant f, Contravariant g) => Functor (Compose f g) Source #
Instance details Defined in Data.Functor.Contravariant.Compose Methods fmap :: (a -> b) -> Compose f g a -> Compose f g b # (<$) :: a -> Compose f g b -> Compose f g a #

Composition of covariant and contravariant functors

Constructors

ComposeFC
Fields getComposeFC :: f (g a)

Instances details

(Functor f, Contravariant g) => Contravariant (ComposeFC f g) Source #
Instance details Defined in Data.Functor.Contravariant.Compose Methods contramap :: (a' -> a) -> ComposeFC f g a -> ComposeFC f g a' # (>$) :: b -> ComposeFC f g b -> ComposeFC f g a #
(Functor f, Functor g) => Functor (ComposeFC f g) Source #
Instance details Defined in Data.Functor.Contravariant.Compose Methods fmap :: (a -> b) -> ComposeFC f g a -> ComposeFC f g b # (<$) :: a -> ComposeFC f g b -> ComposeFC f g a #
(Applicative f, Decidable g) => Decidable (ComposeFC f g) Source #
Instance details Defined in Data.Functor.Contravariant.Compose Methods lose :: (a -> Void) -> ComposeFC f g a Source # choose :: (a -> Either b c) -> ComposeFC f g b -> ComposeFC f g c -> ComposeFC f g a Source #
(Applicative f, Divisible g) => Divisible (ComposeFC f g) Source #
Instance details Defined in Data.Functor.Contravariant.Compose Methods divide :: (a -> (b, c)) -> ComposeFC f g b -> ComposeFC f g c -> ComposeFC f g a Source # conquer :: ComposeFC f g a Source #

Composition of contravariant and covariant functors

Constructors

ComposeCF
Fields getComposeCF :: f (g a)

Instances details

(Contravariant f, Functor g) => Contravariant (ComposeCF f g) Source #
Instance details Defined in Data.Functor.Contravariant.Compose Methods contramap :: (a' -> a) -> ComposeCF f g a -> ComposeCF f g a' # (>$) :: b -> ComposeCF f g b -> ComposeCF f g a #
(Functor f, Functor g) => Functor (ComposeCF f g) Source #
Instance details Defined in Data.Functor.Contravariant.Compose Methods fmap :: (a -> b) -> ComposeCF f g a -> ComposeCF f g b # (<$) :: a -> ComposeCF f g b -> ComposeCF f g a #
(Divisible f, Applicative g) => Divisible (ComposeCF f g) Source #
Instance details Defined in Data.Functor.Contravariant.Compose Methods divide :: (a -> (b, c)) -> ComposeCF f g b -> ComposeCF f g c -> ComposeCF f g a Source # conquer :: ComposeCF f g a Source #