From: art yerkes <ayerkes@speakeasy.net>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Subclasses and pattern matching
Date: Fri, 19 Sep 2003 11:32:07 -0500 [thread overview]
Message-ID: <20030919113207.14fbae30.ayerkes@speakeasy.net> (raw)
In-Reply-To: <20030919155431.GA31387@henchmonkey.org>
On Fri, 19 Sep 2003 11:54:31 -0400
katre <katre@henchmonkey.org> wrote:
> art yerkes wrote:
> > You could wrap your items in a union:
> >
> > exception NoExternalRepForBase
> >
> > type 'a base_extern_t =
> > Derived1 of 'a | Derived2 of 'a
> >
> > class virtual base =
> > object
> > method virtual as_external : unit -> base base_extern_t
> > end
> >
>
> Will this allow me to call methods that only exist on the derived
> classes after the pattern match? I'm not sure this type lets the
> typechecker know exactly which derived class I have.
>
> katre
I've heard that coca-ml does the rest (though I haven't tried it myself).
http://www.pps.jussieu.fr/~emmanuel/Public/Dev/coca-ml/index-en.html
--
"Should array indices start at 0 or 1? My compromise of 0.5 was rejected
without, I thought, proper consideration."
- S. Kelly-Bootle
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next prev parent reply other threads:[~2003-09-19 16:22 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-19 14:21 katre
2003-09-19 14:52 ` Richard Jones
2003-09-19 15:22 ` katre
2003-09-19 15:58 ` art yerkes
[not found] ` <20030919155431.GA31387@henchmonkey.org>
2003-09-19 16:32 ` art yerkes [this message]
2003-09-19 16:40 ` Claude Marche
2003-09-20 15:00 ` Michal Moskal
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