Haskell | class Functor f where fma - Anonymous - m5b68c02c - Pastebin.com

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By Anonymous on the 4th of Feb 2010 07:52:15 PM Download | Raw | Embed | Report

class Functor f where
    fmap :: ( a -> b ) -> f a -> f b
 
class ContraFunctor f where
    contraMap :: ( a -> b ) -> (f b -> f a)
 
instance ContraFunctor Maybe where
    contraMap f (Just a) = Just (f a)

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