Popularity
5.3
Declining
Activity
0.0
Stable
5
5
2
Monthly Downloads: 18
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags:
Generics
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README
Generate (derive) generalized fmap, foldMap and traverse for Bifunctors,
Trifunctors, or a functor with any arity
Example:
data U a b c d
= L [U a b c d] -- polymorphic recursion
| M (V (a,b) (Either c d)) -- mutually recursive
| a :+: Int -- infix syntax, record syntax, type synonyms
| R { c :: c, d :: String } -- and primitive data types supported
data V u v = X (U v v u u) | Z u
fmapU :: (a -> a') -> (b -> b') -> (c -> c') -> (d -> d') ->
U a b c d -> U a' b' c' d'
fmapU = $(genFmap ''U)
foldU :: Monoid m => (a -> m) -> (b -> m) -> (c -> m) -> (d -> m) ->
U a b c d -> m
foldU = $(genFoldMap ''U)
travU :: Applicative f =>
(a -> f a') -> (b -> f b') -> (c -> f c') -> (d -> f d') ->
U a b c d -> f (U a' b' c' d')
travU = $(genTraverse ''U)