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tel/gist:e1f040a4e42887e6ab7a

Created December 2, 2014 14:51
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Num-in-Reader
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gistfile1.hs
-- We'll use the instance of Applicative for ((->) a) below
instance Num b => Num (a -> b) where
(+) = liftA2 (+)
(*) = liftA2 (*)
(-) = liftA2 (-)
negate = fmap negate
signum = fmap signum
abs = fmap abs
fromInteger = pure . fromInteger
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