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co-dan/fnctrcomposition.hs

Created March 14, 2013 11:42
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fnctrcomposition.hs
import Data.Functor.Compose
data N n = N { unN :: n Int }
f :: (Functor n, Functor m) => (Int -> m Int) -> N n -> N (Compose n m)
f h = N . Compose . fmap h . unN
-- f h (N x) = N $ Compose (fmap h x)
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