From: Matthew William Cox <matt@mattcox.ca>
To: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] equality operators in OCaml
Date: Fri, 25 Jul 2008 16:14:22 -0400 [thread overview]
Message-ID: <20080725201421.GA6015@saturn.mattcox.ca> (raw)
In-Reply-To: <200807242140.40245.peng.zang@gmail.com>
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On Thu, Jul 24, 2008 at 09:40:36PM -0400, Peng Zang wrote:
> Yeah, that always seemed broken to me. If two things are physically equal
> (they occupy the same memory space) it doesn't make sense for them to be
> structurally unequal (contain different content). Personally, one of the
> first things I did is redefined (=) to fix this.
It's not broken at all, but complient with a common and longstanding
idiom (at least amoung scientists working with numerical codes.) The way
we test for NaN is by comparing to itself, eg:
if x = x then (* x is a number *) else (* x is NaN *)
Matt
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next prev parent reply other threads:[~2008-07-25 20:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-24 19:27 Raj Bandyopadhyay
2008-07-24 22:15 ` [Caml-list] " Vincent Hanquez
2008-07-24 22:32 ` Jon Harrop
2008-07-25 1:40 ` Peng Zang
2008-07-25 10:34 ` Christophe TROESTLER
2008-07-25 12:04 ` Peng Zang
2008-07-25 20:14 ` Matthew William Cox [this message]
2008-07-25 22:27 ` Peng Zang
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