From: David Brown <caml-list@davidb.org>
To: Michal Moskal <malekith@pld-linux.org>
Cc: John Carr <jfc@MIT.EDU>, Brian Hurt <brian.hurt@qlogic.com>,
caml-list@inria.fr
Subject: Re: [Caml-list] tree walking with... specular rec functions? what else?
Date: Mon, 12 May 2003 08:06:07 -0700 [thread overview]
Message-ID: <20030512150607.GA21915@opus.davidb.org> (raw)
In-Reply-To: <20030512133542.GA9977@roke.freak>
On Mon, May 12, 2003 at 03:35:42PM +0200, Michal Moskal wrote:
> On non-mutable structures, the behavior of (==) is
> implementation-dependent.
>
> Which means that lst = [] does not imply lst == [].
>
> In other words, one should use:
>
> if lst = [] then empty-code else full-code
>
> or pattern matching, as you said.
Is it really not defined by Ocaml? Ocaml implements the empty list as
the integer value zero. Although (==) won't tell you if two cons-cells
have the same contents, it will tell you if they are the same.
So is there any implementation of a caml language where [] == [] isn't
always true, for any way that [] is generated?
The (=) has more overhead, and in this case, I'm not sure it is
necessary.
Dave
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next prev parent reply other threads:[~2003-05-12 15:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-09 9:56 Stalkern 2
2003-05-09 15:23 ` Brian Hurt
2003-05-12 12:57 ` John Carr
2003-05-12 13:35 ` Michal Moskal
2003-05-12 15:06 ` David Brown [this message]
2003-05-12 15:24 ` Xavier Leroy
2003-05-11 16:02 ` Xavier Leroy
2003-05-12 6:55 ` Stalkern 2
2003-05-12 10:14 ` Gérard Huet
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