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chris-martin/ComposeApply.hs

Created August 4, 2021 23:52
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ComposeApply.hs
{-# language FlexibleContexts, FlexibleInstances, FunctionalDependencies #-}
module Idea where
class ComposeApply a b c | a b -> c where
(#) :: a -> b -> c
instance ComposeApply (a -> b) a b where
f # x = f x
instance ComposeApply (b -> c) (a -> b) (a -> c) where
f # g = \x -> f # (g # x)
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