From: Martin Jambon <martin.jambon@ens-lyon.org>
To: Alain Frisch <alain@frisch.fr>
Cc: caml-list <caml-list@yquem.inria.fr>
Subject: Re: [Caml-list] Compiler feature - useful or not?
Date: Fri, 16 Nov 2007 17:43:39 +0100 (CET) [thread overview]
Message-ID: <Pine.LNX.4.64.0711161739580.15563@martin.ec.wink.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0711161538260.13982@martin.ec.wink.com>
On Fri, 16 Nov 2007, Martin Jambon wrote:
> On Fri, 16 Nov 2007, Alain Frisch wrote:
>
>> Martin Jambon wrote:
>> > You can write
>> > match (x : Priv_int.t) with 0 -> true | _ -> false
>>
>> Actually, you cannot do that, at least with private types as implemented
>> in OCaml's CVS. And this is to be expected given the lack of implicit
>> subsumption in OCaml. If you were able to do such a thing, what type
>> schema would you give to:
>>
>> let f = function 0 -> true | _ -> false
>>
>> ?
>
> Using the notation for polymorphic variant types:
>
> val f : [< int ] -> bool
>
> Type [> int ] would be the same as [ int ] or int.
Please don't take my suggestions too seriously, but it could be cool to
define types such as:
type bit = [ 0 | 1 ]
Martin
--
http://wink.com/profile/mjambon
http://martin.jambon.free.fr
next prev parent reply other threads:[~2007-11-16 16:43 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-13 23:41 Edgar Friendly
2007-11-14 0:08 ` [Caml-list] " Yaron Minsky
2007-11-14 0:21 ` Martin Jambon
2007-11-14 7:58 ` Pierre Weis
2007-11-14 12:37 ` Alain Frisch
2007-11-14 13:56 ` Virgile Prevosto
2007-11-14 14:35 ` Pierre Weis
2007-11-14 16:38 ` Alain Frisch
2007-11-14 18:43 ` Pierre Weis
2007-11-14 19:19 ` Edgar Friendly
2007-11-15 6:29 ` Alain Frisch
2007-11-15 13:26 ` Pierre Weis
2007-11-15 17:29 ` Edgar Friendly
2007-11-15 20:28 ` Fernando Alegre
2007-11-16 0:47 ` Brian Hurt
2007-11-15 22:37 ` Michaël Le Barbier
2007-11-15 22:24 ` Michaël Le Barbier
2007-11-16 0:30 ` Yaron Minsky
2007-11-16 1:51 ` Martin Jambon
2007-11-16 9:23 ` Alain Frisch
2007-11-16 14:17 ` rossberg
2007-11-16 15:08 ` Martin Jambon
2007-11-16 16:43 ` Martin Jambon [this message]
2007-11-16 16:46 ` Till Varoquaux
2007-11-16 17:27 ` Edgar Friendly
2007-11-16 17:47 ` Martin Jambon
2007-11-16 17:54 ` Edgar Friendly
2007-11-16 18:10 ` Fernando Alegre
2007-11-16 19:18 ` David Allsopp
2007-11-16 19:32 ` Fernando Alegre
2007-11-16 19:50 ` Gerd Stolpmann
2007-11-16 17:31 ` Fernando Alegre
2007-11-16 17:43 ` Edgar Friendly
2007-11-16 0:46 ` Christophe TROESTLER
2007-11-16 8:23 ` Andrej Bauer
2007-11-16 8:58 ` Jean-Christophe Filliâtre
2007-11-16 9:13 ` Andrej Bauer
2007-11-16 9:48 ` Christophe TROESTLER
2007-11-14 16:57 ` Edgar Friendly
2007-11-14 21:04 ` Pierre Weis
2007-11-14 22:09 ` Edgar Friendly
2007-11-15 0:17 ` Jacques Garrigue
2007-11-15 6:23 ` Edgar Friendly
2007-11-15 10:53 ` Vincent Hanquez
2007-11-15 13:48 ` Jacques Carette
2007-11-15 14:43 ` Jon Harrop
2007-11-15 16:54 ` Martin Jambon
2007-11-14 16:09 ` Edgar Friendly
2007-11-14 16:20 ` Brian Hurt
2007-11-14 11:01 ` Gerd Stolpmann
2007-11-14 10:57 ` Jon Harrop
2007-11-14 14:37 ` Zheng Li
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