From: Olivier Andrieu <andrieu@oxygene.ijm.jussieu.fr>
To: Alan Schmitt <alan.schmitt@inria.fr>
Cc: caml-list@inria.fr,
Juergen Pfitzenmaier <pfitzen@informatik.uni-tuebingen.de>
Subject: Re: [Caml-list] Comparison of functional values
Date: Wed, 7 Mar 2001 09:49:50 +0100 [thread overview]
Message-ID: <15013.63022.363394.271012@akasha.ijm.jussieu.fr> (raw)
In-Reply-To: <20010307062028.O7121@alan-schm1p.inria.fr>
Alan Schmitt [Wednesday 7 March 2001] :
> As stated in http://caml.inria.fr/ocaml/htmlman/manual031.html, != is
> the negation of ==.
Salut Alan !
I known. But to use the Set functor, you need a `compare' function of
type ('a -> 'a -> int) whereas != and == have type ('a -> bool).
So != does not seem very helpful here.
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);
}
Olivier
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next prev parent reply other threads:[~2001-03-07 8:49 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 ` Olivier Andrieu [this message]
2001-03-07 8:56 ` [Caml-list] Comparison of functional values Xavier Leroy
2001-03-06 22:17 Arturo Borquez
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