compdata-0.5.2: Compositional Data Types

Portabilitynon-portable (GHC Extensions)
Stabilityexperimental
MaintainerTom Hvitved <hvitved@diku.dk>
Safe HaskellNone

Data.Comp.MultiParam.HDitraversable

Description

This module defines traversable higher-order difunctors.

Synopsis

Documentation

class HDifunctor f => HDitraversable f whereSource

HDifunctors representing data structures that can be traversed from left to right.

Methods

hdimapM :: Monad m => NatM m b c -> NatM m (f a b) (f a c)Source

class HFoldable t => HTraversable t whereSource

Methods

hmapM :: Monad m => NatM m a b -> NatM m (t a) (t b)Source

Map each element of a structure to a monadic action, evaluate these actions from left to right, and collect the results.

Alternative type in terms of natural transformations using functor composition :.::

hmapM :: Monad m => (a :-> m :.: b) -> t a :-> m :.: (t b)

htraverse :: Applicative f => NatM f a b -> NatM f (t a) (t b)Source