Data.Functor.Constant

Documentation

newtype Constant a b

Constructors

Constant a

Instances

Bicovariant (Constant :: * -> * -> *)

Defined in Data.Functor.Constant

Methods

bicomap :: (a -> b) -> (c -> d) -> Constant a c -> Constant b d

Contravariant (Constant a :: * -> *)

Defined in Data.Functor.Constant

Methods

(>$<) :: (a0 -> b) -> Constant a b -> Constant a a0

contramap :: (a0 -> b) -> Constant a b -> Constant a a0

(>$) :: b -> Constant a b -> Constant a a0

($<) :: Constant a b -> b -> Constant a a0

full :: Constant a () -> Constant a a0

Covariant (Constant a :: * -> *)

Defined in Data.Functor.Constant

Methods

(<$>) :: (a0 -> b) -> Constant a a0 -> Constant a b

comap :: (a0 -> b) -> Constant a a0 -> Constant a b

(<$) :: a0 -> Constant a b -> Constant a a0

($>) :: Constant a a0 -> b -> Constant a b

void :: Constant a a0 -> Constant a ()

Traversable (Constant a :: * -> *)

Defined in Data.Functor.Constant

Methods

(->>) :: (Pointable u, Applicative u) => Constant a a0 -> (a0 -> u b) -> (u :.: Constant a) b

traverse :: (Pointable u, Applicative u) => (a0 -> u b) -> Constant a a0 -> (u :.: Constant a) b

sequence :: (Pointable u, Applicative u) => (Constant a :.: u) a0 -> (u :.: Constant a) a0