./devel/hs-indexed-traversable, FunctorWithIndex, FoldableWithIndex, TraversableWithIndex

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Branch: pkgsrc-2021Q4, Version: 0.1.1nb1, Package name: hs-indexed-traversable-0.1.1nb1, Maintainer: pho

This package provides three useful generalizations:

class Functor f => FunctorWithIndex i f | f -> i where
imap :: (i -> a -> b) -> f a -> f b

class Foldable f => FoldableWithIndex i f | f -> i where
ifoldMap :: Monoid m => (i -> a -> m) -> f a -> m

class (FunctorWithIndex i t, FoldableWithIndex i t, Traversable t)
=> TraversableWithIndex i t | t -> i where
itraverse :: Applicative f => (i -> a -> f b) -> t a -> f (t b)

This package contains instances for types in GHC boot libraries. For
some additional instances see indexed-traversable-instances.

The keys package provides similar functionality, but uses (associated)
TypeFamilies instead of FunctionalDependencies.

Master sites:

Filesize: 8.227 KB

Version history: (Expand)