English version
Accueil     À propos     Téléchargement     Ressources     Contactez-nous    

Ce site est rarement mis à jour. Pour les informations les plus récentes, rendez-vous sur le nouveau site OCaml à l'adresse ocaml.org.

Browse thread
RE: [Caml-list] Semantics of physical equality
[ Home ] [ Index: by date | by threads ]
[ Search: ]

[ Message by date: previous | next ] [ Message in thread: previous | next ] [ Thread: previous | next ]
Date: 2004-02-29 (19:48)
From: Jed Davis <jdev@p...>
Subject: [Caml-list] Re: Semantics of physical equality
Michal Moskal <malekith@pld-linux.org> writes:

> On Fri, Feb 27, 2004 at 05:16:06PM -0600, Kevin S. Millikin wrote:
>> In the current problem, it can save me a great
>> deal of effort involved in generating temporary identifiers that are
>> guaranteed to be unique, and in wrapping library data structures that I
>> am unwilling to change in order merely to tag them.
> type t = V of int ref
> let t1 = V (ref 0)
> let t2 = V (ref 0)
> In this case you can assume t1 != t2. If it is not a sum type, but
> record type, you can use record with at least one mutable field.


type t = unit ref
let t1 : t = ref ()
let t2 : t = ref ()
let mt : _ -> t = ref

[Jed Davis]              A098 903E 9B9A DEF4 168F  AA09 BF07 807E F336 59F9
 <jdev@panix.com>                                               0xF33659F9
  "But life wasn't yes-no, on-off.  Life was shades of gray, and rainbows
   not in the order of the spectrum." -- L. E. Modesitt, Jr., _Adiamante_

To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr
Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/
Beginner's list: http://groups.yahoo.com/group/ocaml_beginners