From: "Andreas Rossberg" <AndreasRossberg@web.de>
To: <caml-list@yquem.inria.fr>
Subject: Re: [Caml-list] type of ==
Date: Mon, 18 Apr 2005 14:11:51 +0200 [thread overview]
Message-ID: <001901c5440f$ce1a5e80$14b2a8c0@wiko> (raw)
In-Reply-To: <200504181227.07108.jon@ffconsultancy.com>
Jon Harrop <jon@ffconsultancy.com>:
>
> If there were an "'a -> 'b -> bool" physical equality test, how could it
ever
> return "true"?
Either when 'a and 'b happen to be instantiated to the same type, or when
the representation happens to be the same, e.g. 0 == false.
The latter also provides a good argument against making physical equality
too polymorphic. It would break abstraction, much worse than it does
already. In particular, a program's meaning could depend on implementation
details (like false being represented by 0) in very questionable ways.
Cheers,
- Andreas
next prev parent reply other threads:[~2005-04-18 12:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-18 9:18 Christophe DEHLINGER
2005-04-18 11:27 ` [Caml-list] " Jon Harrop
2005-04-18 12:11 ` Andreas Rossberg [this message]
2005-04-18 13:10 ` Christophe DEHLINGER
2005-04-18 14:28 ` Jon Harrop
2005-04-19 7:12 ` [Caml-list] type of == - Bayesian Filter detected spam Christophe DEHLINGER
2005-04-18 16:16 ` [Caml-list] type of == Remi Vanicat
2008-01-05 16:41 Type_of? Dario Teixeira
2008-01-05 17:12 ` [Caml-list] Type_of? Jeremy Yallop
2008-01-05 17:43 ` Arnaud Spiwack
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