The actual problem is quite similar to the one that I provided or to the one in the description of the proposed extension that you linked.
Someone on another forum suggested record functions but I'm not sure I understood correctly how that would work around this problem. Any suggestion is greatly appreciated! Thanks, -Gabor Martijn van Steenbergen-2 wrote: > > siki wrote: >> I'm not sure if this is possible at all. I'd like to do something like >> this: >> >> class A a where >> foo :: a -> Double >> >> foo a = 5.0 >> >> >> class (A a) => B a where >> foo a = 7.0 > > This is currently not possible in Haskell. It's been proposed, though: > > http://haskell.org/haskellwiki/Class_system_extension_proposal > > If you have an actual example we might be able to come up with a > different way of modelling it so that it does what you want, though. > > Martijn. > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > > -- View this message in context: http://www.nabble.com/Can-subclass-override-its-super-class%27-default-implementation-of-a-function--tp23264975p23265759.html Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
