From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Paul Eggert <eggert@cs.ucla.edu>
Cc: 8611@debbugs.gnu.org
Subject: bug#8611: fixnum arithmetic should not wrap around
Date: Wed, 04 May 2011 09:57:10 -0300 [thread overview]
Message-ID: <jwvzkn2vd84.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <4DC0D198.7020506@cs.ucla.edu> (Paul Eggert's message of "Tue, 03 May 2011 21:10:00 -0700")
> I'm still not understanding the principle. For example,
> (string-to-number "536870912") operates entirely within Elisp,
> but it returns a float when the integer is out of range.
No: the content of a string is "external data", so string-to-number,
just like `read', brings external data into the Elisp world.
> In contrast, the principle "operations that would return
> an integer out of range, return a nearby float instead"
> is simple and easy to explain.
Conversion to float is in general not a good idea, as I'm sure you're
aware, since the semantics of floating point numbers is very different
from the semantics of integers. So I'd rather not do it more than we
currently do.
Also, I'd rather not fix something that's not broken, and AFAIK the
current inconsistent behavior has not caused any real problem.
Stefan
next prev parent reply other threads:[~2011-05-04 12:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-03 18:27 bug#8611: fixnum arithmetic should not wrap around Paul Eggert
2011-05-04 0:31 ` Stefan Monnier
2011-05-04 1:19 ` Paul Eggert
2011-05-04 1:29 ` Stefan Monnier
2011-05-04 4:10 ` Paul Eggert
2011-05-04 12:57 ` Stefan Monnier [this message]
2011-05-04 15:06 ` Paul Eggert
2011-05-04 18:41 ` Stefan Monnier
2016-06-11 0:00 ` Noam Postavsky
2018-08-22 17:02 ` bug#8611: close Tom Tromey
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