From: qrczak@knm.org.pl (Marcin 'Qrczak' Kowalczyk)
To: caml-list@inria.fr
Subject: Re: [Caml-list] equality over functional value
Date: 21 Apr 2001 11:32:05 GMT [thread overview]
Message-ID: <slrn9e2rtl.6f5.qrczak@qrnik.zagroda> (raw)
In-Reply-To: <Pine.GSO.4.04.10104202315240.982-100000@clipper.ens.fr>
Fri, 20 Apr 2001 23:23:26 +0200 (MET DST), Alain Frisch <frisch@clipper.ens.fr> pisze:
> While we are about it, what is the reason for disallowing structural
> comparison over functional values (that is, comparing for instance the
> code address, then the environment) ?
It would say that (fun x -> x+1) is not equal to (fun x -> x+1).
Or maybe that it is, depending on how smart the compiler is.
And it's impossible to say whether (fun () -> 1+2) is equal to
(fun () -> 2+1).
Embedding pointer equality of immutable values into value equality
doesn't have a sane meaning.
--
__("< Marcin Kowalczyk * qrczak@knm.org.pl http://qrczak.ids.net.pl/
\__/
^^ SYGNATURA ZASTĘPCZA
QRCZAK
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next prev parent reply other threads:[~2001-04-21 17:04 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-20 20:12 Georges Brun-Cottan
2001-04-20 21:23 ` Alain Frisch
2001-04-21 11:32 ` Marcin 'Qrczak' Kowalczyk [this message]
2001-04-21 15:24 ` David Monniaux
2001-04-23 7:01 ` Jean-Christophe Filliatre
2001-04-23 7:56 ` Xavier Leroy
2001-04-23 14:04 ` Alain Frisch
2001-04-24 7:13 ` Fabrice Le Fessant
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