Might not be exactly what you're looking for, but Control.Arrow has a rich set of operators that can be used to combine functions.
For instance, there's an example on http://en.wikibooks.org/wiki/Haskell/Understanding_arrows showing an addA function that can be used to apply two functions to the same argument and add the results: Prelude> import Control.Arrow Prelude Control.Arrow> let addA f g = f &&& g >>> arr (\ (y, z) -> y + z) Prelude Control.Arrow> addA (+2) (*5) 10 62 If you're set on using the + and * operators, I'm guessing it's not possible to define a (sane) instance of Num for (->), but it would probably be instructive to try. On Sat, Aug 31, 2013 at 10:01 PM, Christopher Howard < christopher.how...@frigidcode.com> wrote: > Hi. I was just curious about something. In one of my math textbooks I see > expressions like this > > f + g > > or > > (f + g)(a) > > where f and g are functions. What is meant is > > f(a) + g(a) > > Is there a way in Haskell you can make use of syntax like that (i.e., > expressions like f + g and f * g to create a new function), perhaps by > loading a module or something? > > ______________________________**_________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/**mailman/listinfo/haskell-cafe<http://www.haskell.org/mailman/listinfo/haskell-cafe> >
_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
