On Thu, 2006-10-05 at 10:34 -0700, Erick Tryzelaar wrote:
> I got a couple questions after my first attempt with the new
> typeclasses. First off, is it possible to call a function directly from
> an instance?
No, not at the moment. The current implementation is heavily
restricted, some of the restrictions will get lifted.
>
> Second, typeclasses support recursive types, right? If so, how do I use
> them? I couldn't get this section to compile:
>
> ///////////////////////////////////
> open List;
>
> fun foo[T with Str[T]] (x:list[T]):string =>
> match x with
> | Empty[T] => "()"
> | Cons(?h, ?t) => "(" + (str2 h) + ", " + (foo x) + ")"
> endmatch
> ;
> ///////////////////////////////////
>
>
> It errors out with this:
>
>
> Flx_exceptions.ClientError2(_, _, "Instantiate virtual function(2) str2")
Ok, I get that too.
--
John Skaller <skaller at users dot sf dot net>
Felix, successor to C++: http://felix.sf.net
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