From: Patrick M Doane <patrick@watson.org>
To: Didier Le Botlan <lebotlan@beaune.inria.fr>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Unbound type variables
Date: Thu, 13 Sep 2001 13:40:42 -0400 (EDT) [thread overview]
Message-ID: <Pine.BSF.3.96.1010913133902.1440E-100000@fledge.watson.org> (raw)
In-Reply-To: <3BA0F11F.DE0303F1@beaune.inria.fr>
Interesting - thanks to you and Olivier for pointing this out!
I wasn't aware of how to do this or what the 'constraint' aspect might be
used for.
Patrick
On Thu, 13 Sep 2001, Didier Le Botlan wrote:
> What do you think of a parameterized class ?
>
> class ['a] c = object
> method m (x:'a) =
> match x with
> | `A -> ()
> | `B -> ()
> | `C -> ()
> end
>
> class [[< `A | `B | `C] as 'b] c :
> object constraint 'b = 'b method m : 'b -> unit end
>
> Beware that the 'a parameter is freezed for each instance of the class,
> that is you cannot call method m twice on the same object with
> incompatible arguments.
>
>
> --
> Didier Le Botlan
> http://cristal.inria.fr/~lebotlan
>
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prev parent reply other threads:[~2001-09-13 17:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-13 17:15 Patrick M Doane
2001-09-13 17:36 ` Olivier Andrieu
2001-09-13 17:47 ` Didier Le Botlan
2001-09-13 17:40 ` Patrick M Doane [this message]
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