Num instance for functions
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Revision as of 13:08, 17 April 2007
Some people have argued, thatNum
(->)
to add functions nicely, say for
f, g :: Num a => b -> a
you would define
(f+g) x = f x + g x
fromInteger
fromInteger = const
numeric literals would also denote constant functions. This allows
f+2 == \x -> f x + 2
Even nicer, the mathematically established notation of omitting the multiplication dot
2(x+y) :: Integer
will now be parsed by a Haskell compiler to the most obvious meaning
2 :: Integer
! :-)
