On Fri, 2008-10-03 at 12:22 +0200, Florian Weimer wrote: > I'm trying to encode a well-known, informally-specified type system in > Haskell. What causes problems for me is that type classes force types > to be of a specific kind. The system I'm targeting however assumes that > its equivalent of type classes are kind-agnositic. > > For instance, I've got > > class Assignable a where > assign :: a -> a -> IO () > > class Swappable a where > swap :: a -> a -> IO () > > class CopyConstructible a where > copy :: a -> IO a > > class (Assignable a, CopyConstructible a) => ContainerType a > > class (Swappable c, Assignable c, CopyConstructible c) => Container c where > size :: (Num i, ContainerType t) => c t -> IO i
instane Container Maybe where... What does copy :: Maybe -> IO Maybe mean? _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
