From: Francois Pottier <francois.pottier@inria.fr>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Breaking out of iterative loops
Date: Thu, 2 May 2002 11:14:22 +0200 [thread overview]
Message-ID: <20020502111422.A31527@pauillac.inria.fr> (raw)
In-Reply-To: <20020502083335.GB16030@fichte.ai.univie.ac.at>; from markus@oefai.at on Thu, May 02, 2002 at 10:33:35AM +0200
On Thu, May 02, 2002 at 10:33:35AM +0200, Markus Mottl wrote:
>
> I second this. Does anybody here really benefit from such cyclic
> structures?
Yes, they can be useful, at least when they are mutable. Sometimes
a pointer to a known node (i.e. a cyclic pointer) can be used instead
of None. This can save the use of an option type, for instance.
Anyway, in the presence of mutable fields, you can't prevent cyclic
structures from appearing, so there is no point in disallowing their
explicit definition.
The situation is different in the case of immutable structures. I
don't know of any situation where immutable, cyclic structures are
useful.
--
François Pottier
Francois.Pottier@inria.fr
http://pauillac.inria.fr/~fpottier/
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next prev parent reply other threads:[~2002-05-02 9:14 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-30 20:27 Vincent Foley
2002-04-30 21:38 ` Johan Baltié
2002-05-02 0:57 ` John Max Skaller
2002-05-02 2:18 ` John Prevost
2002-05-02 8:33 ` Markus Mottl
2002-05-02 9:14 ` Francois Pottier [this message]
2002-05-02 9:50 ` Alain Frisch
2002-05-02 14:35 ` Alessandro Baretta
2002-05-02 15:40 ` John Max Skaller
2002-05-02 13:15 Krishnaswami, Neel
2002-05-02 13:34 ` Markus Mottl
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