[Haskell-cafe] Non-advanced usage of Type classes

[Yves Parès]

...and the other one being operational (which I find simpler).


2011/6/8 Brandon Allbery <allbery.b at gmail.com>

> On Tue, Jun 7, 2011 at 16:16, Arnaud Bailly <arnaud.oqube at gmail.com>
> wrote:
> > For example, while designing some program (a game...) I defined a type
> class
> > thus:
> >
> >> class (Monad io) => CommandIO io where
> >>  readCommand  :: io Command
> >>  writeResult  :: CommandResult -> io ()
>
> This is in fact one of the reasons to use type classes.  In fact,
> you'll find a somewhat more general variety of it on Hackage in a
> couple of forms, the one I'm most familiar with being MonadPrompt.
>
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