Vivian McPhail wrote:
> > > class Forkable a where
> > > fork :: String -> a -> a -> a
....
> What I would like to be able to do is
> differentiate between Forkable (m a ->
> b) and Forkable (<function type> -> b).
Have you tried this combination of instances?
instance Forkable (IO a) where ...
-- and similarly for all the concrete
-- monad types you will use fork with
instance (Forkable a, Forkable b) =>
Forkable (a -> b) where ...
Alternatively, since the fork function seems to be all about
propagating a value (the String), would Control.Monad.Reader
serve your purpose?
Regards,
Tom
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