From: Didier Le Botlan <lebotlan@beaune.inria.fr>
To: Patrick M Doane <patrick@watson.org>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Unbound type variables
Date: Thu, 13 Sep 2001 19:47:11 +0200 [thread overview]
Message-ID: <3BA0F11F.DE0303F1@beaune.inria.fr> (raw)
In-Reply-To: <Pine.BSF.3.96.1010913130641.1440D-100000@fledge.watson.org>
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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next prev parent reply other threads:[~2001-09-13 17:39 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 [this message]
2001-09-13 17:40 ` Patrick M Doane
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