Copyright	(C) 2013-2015 Edward Kmett and Dan Doel
License	BSD-style (see the file LICENSE)
Maintainer	Edward Kmett <ekmett@gmail.com>
Stability	provisional
Portability	Rank2Types, TFs
Safe Haskell	Safe
Language	Haskell2010

Data.Profunctor.Ran

Description

Synopsis

newtype Ran p q a b = Ran {
- runRan :: forall x. p x a -> q x b
}
decomposeRan :: Procompose (Ran q p) q :-> p
precomposeRan :: Profunctor q => Procompose q (Ran p (->)) :-> Ran p q
curryRan :: (Procompose p q :-> r) -> p :-> Ran q r
uncurryRan :: (p :-> Ran q r) -> Procompose p q :-> r
newtype Codensity p a b = Codensity {
- runCodensity :: forall x. p x a -> p x b
}
decomposeCodensity :: Procompose (Codensity p) p a b -> p a b

Documentation

newtype Ran p q a b #

This represents the right Kan extension of a Profunctor q along a Profunctor p in a limited version of the 2-category of Profunctors where the only object is the category Hask, 1-morphisms are profunctors composed and compose with Profunctor composition, and 2-morphisms are just natural transformations.

Constructors

Ran
Fields runRan :: forall x. p x a -> q x b

Instances

Category p => ProfunctorComonad (Ran p) #
Instance details Defined in Data.Profunctor.Ran Methods proextract :: Profunctor p0 => Ran p p0 :-> p0 # produplicate :: Profunctor p0 => Ran p p0 :-> Ran p (Ran p p0) #
ProfunctorFunctor (Ran p) #
Instance details Defined in Data.Profunctor.Ran Methods promap :: Profunctor p0 => (p0 :-> q) -> Ran p p0 :-> Ran p q #
p ~ q => Category (Ran p q :: Type -> Type -> Type) #	`Ran p p` forms a `Monad` in the `Profunctor` 2-category, which is isomorphic to a Haskell `Category` instance.
Instance details Defined in Data.Profunctor.Ran Methods id :: Ran p q a a # (.) :: Ran p q b c -> Ran p q a b -> Ran p q a c #
(Profunctor p, Profunctor q) => Profunctor (Ran p q) #
Instance details Defined in Data.Profunctor.Ran Methods dimap :: (a -> b) -> (c -> d) -> Ran p q b c -> Ran p q a d # lmap :: (a -> b) -> Ran p q b c -> Ran p q a c # rmap :: (b -> c) -> Ran p q a b -> Ran p q a c # (#.) :: Coercible c b => q0 b c -> Ran p q a b -> Ran p q a c # (.#) :: Coercible b a => Ran p q b c -> q0 a b -> Ran p q a c #
Profunctor q => Functor (Ran p q a) #
Instance details Defined in Data.Profunctor.Ran Methods fmap :: (a0 -> b) -> Ran p q a a0 -> Ran p q a b # (<$) :: a0 -> Ran p q a b -> Ran p q a a0 #

decomposeRan :: Procompose (Ran q p) q :-> p #

The 2-morphism that defines a right Kan extension.

Note: When q is left adjoint to Ran q (->) then decomposeRan is the counit of the adjunction.

precomposeRan :: Profunctor q => Procompose q (Ran p (->)) :-> Ran p q #

curryRan :: (Procompose p q :-> r) -> p :-> Ran q r #

uncurryRan :: (p :-> Ran q r) -> Procompose p q :-> r #

newtype Codensity p a b #

This represents the right Kan extension of a Profunctor p along itself. This provides a generalization of the "difference list" trick to profunctors.

Constructors

Codensity
Fields runCodensity :: forall x. p x a -> p x b

Instances

Profunctor p => Profunctor (Codensity p) #
Instance details Defined in Data.Profunctor.Ran Methods dimap :: (a -> b) -> (c -> d) -> Codensity p b c -> Codensity p a d # lmap :: (a -> b) -> Codensity p b c -> Codensity p a c # rmap :: (b -> c) -> Codensity p a b -> Codensity p a c # (#.) :: Coercible c b => q b c -> Codensity p a b -> Codensity p a c # (.#) :: Coercible b a => Codensity p b c -> q a b -> Codensity p a c #
Category (Codensity p :: Type -> Type -> Type) #
Instance details Defined in Data.Profunctor.Ran Methods id :: Codensity p a a # (.) :: Codensity p b c -> Codensity p a b -> Codensity p a c #
Profunctor p => Functor (Codensity p a) #
Instance details Defined in Data.Profunctor.Ran Methods fmap :: (a0 -> b) -> Codensity p a a0 -> Codensity p a b # (<$) :: a0 -> Codensity p a b -> Codensity p a a0 #

decomposeCodensity :: Procompose (Codensity p) p a b -> p a b #