From: Xavier Leroy <Xavier.Leroy@inria.fr>
To: Olivier Andrieu <andrieu@oxygene.ijm.jussieu.fr>
Cc: Alan Schmitt <alan.schmitt@inria.fr>,
caml-list@inria.fr,
Juergen Pfitzenmaier <pfitzen@informatik.uni-tuebingen.de>
Subject: Re: [Caml-list] Comparison of functional values
Date: Wed, 7 Mar 2001 09:56:58 +0100 [thread overview]
Message-ID: <20010307095658.A31660@pauillac.inria.fr> (raw)
In-Reply-To: <15013.63022.363394.271012@akasha.ijm.jussieu.fr>; from andrieu@oxygene.ijm.jussieu.fr on Wed, Mar 07, 2001 at 09:49:50AM +0100
> What I meant actually, was a «physical compare». I found out that
> this (crude) C function works :
>
> value phys_comp(value a, value b)
> {
> if(a<b)
> return Val_int(-1) ;
> else if(a>b)
> return Val_int(+1) ;
> else
> return Val_int(0);
> }
No, it does not: the GC can copy heap blocks and change the relative
ordering of their memory addresses. You really need to pair your
functions with unique identifying integers.
- Xavier Leroy
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next prev parent reply other threads:[~2001-03-07 8:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-06 21:51 Olivier Andrieu
2001-03-07 5:20 ` Alan Schmitt
2001-03-06 22:08 ` Juergen Pfitzenmaier
2001-03-07 8:49 ` [Caml-list] Comparison of functional values Olivier Andrieu
2001-03-07 8:56 ` Xavier Leroy [this message]
2001-03-06 22:17 Arturo Borquez
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