On Fri, Jan 27, 2006 at 08:20:07PM +0100, Sven Biedermann wrote: > I have a problem with a function taken from class Arrow. > > arr :: (b -> c) -> a b c > > To build my own arrow, i need to distinguish between different kinds > of > b or c. > For instance, if b has the form (d,e), i want to construct something > different as when having form (d,e,f).
If you want a different instance in each case, then you'll need a different class: arr is polymorphic in b and c. But perhaps there's another way to do what you want. Can you give more details? _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
