On Tue, Aug 3, 2010 at 9:45 PM, Ryan Ingram <ryani.s...@gmail.com> wrote: > So I believe the "final" way to do this, which is not yet implemented, > works something like this: > > type family LeftToRight a > type family RightToLeft b > > class (LeftToRight a ~ b, RightToLeft b ~ a) => Bijection a b where > ... > > I agree, the fact that this doesn't work is really dumb. >
I think it is more simple like: class Bijection a b where ... type LeftToRight a = (Bijection a b) => b type RightToLeft b = (Bijection a b) => a -- Victor Nazarov _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
