Data.Yoneda

newtype Yoneda f a

The Yoneda Functor

Yoneda f is a Functor for any type constructor f.

Constructors

• Yoneda (forall b. (a -> b) -> f b)

Instances

• (Eq1 f, Eq a) => Eq (Yoneda f a)
• (Eq1 f) => Eq1 (Yoneda f)
• (Ord1 f, Ord a) => Ord (Yoneda f a)
• (Ord1 f) => Ord1 (Yoneda f)
• Functor (Yoneda f)
• (Apply f) => Apply (Yoneda f)
• (Applicative f) => Applicative (Yoneda f)
• (Bind f) => Bind (Yoneda f)
• (Monad f) => Monad (Yoneda f)
• MonadTrans Yoneda
• (Extend w) => Extend (Yoneda w)
• (Comonad w) => Comonad (Yoneda w)

runYoneda :: forall b a f. Yoneda f a -> (a -> b) -> f b

Run a computation of type Yoneda f a.

liftYoneda :: forall a f. Functor f => f a -> Yoneda f a

Lift a value described by the Functor f to the Functor Yoneda f.

lowerYoneda :: forall a f. Yoneda f a -> f a

Lower a value of type Yoneda f a to the type constructor f.

hoistYoneda :: forall a g f. (f ~> g) -> Yoneda f a -> Yoneda g a

Use a natural transformation to change the generating type constructor of a Yoneda.