On Thu, 12 Jul 2007, Andrew Coppin wrote: > peterv wrote: > > > Q3) Suppose I want to declare an instance of Num on all tuple types having > > (Num instances) as elements; is this possible? > > > > I tried > > > > instance Num a => Num (a,a) where . > > > > but this fails > > > > I also tried > > > > instance Num a => Num ((,) a a) where . > > > > but that also fails. > > I tried to do this a while ago and couldn't figure out how. :-(
The new approach of peterv using data Vector2 a = Vector2 a a is more sane. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
