From: Paul Eggert <eggert@cs.ucla.edu>
To: Eli Zaretskii <eliz@gnu.org>
Cc: stephen@xemacs.org, dmantipov@yandex.ru,
monnier@iro.umontreal.ca, emacs-devel@gnu.org
Subject: Re: ptrdiff_t misuse
Date: Fri, 06 Jul 2012 08:56:04 -0700 [thread overview]
Message-ID: <4FF70A94.4050700@cs.ucla.edu> (raw)
In-Reply-To: <834npk3nfa.fsf@gnu.org>
On 07/06/2012 08:43 AM, Eli Zaretskii wrote:
>> But not every use of ptrdiff_t is for buffer and string positions.
>> > Bitmap table sizes, for example.
> Do they really need to be large?
In some cases yes -- certainly in the memory allocators.
Maybe in some cases not, but nobody has taken the time
to think about it, and in the meantime ptrdiff_t is safer.
Generally speaking, if an object can grow and its size
is not limited for other reasons to INT_MAX-or-less,
code should not use 'int' to count its size.
> What for? they span the same range of values.
Yes, that's the point -- if ptrdiff_t and EMACS_POS
would span the same range of values, why bother to
distinguish the two? Whether a value is a
buffer position is usually clearly stated in the
variable name.
next prev parent reply other threads:[~2012-07-06 15:56 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-29 13:20 (unknown) Eli Zaretskii
2012-06-29 14:18 ` ptrdiff_t misuse [was :Re: (empty)] Dmitry Antipov
2012-06-29 17:07 ` Stefan Monnier
2012-06-30 7:13 ` Paul Eggert
2012-06-30 7:27 ` Eli Zaretskii
2012-06-30 13:12 ` Paul Eggert
2012-06-30 14:23 ` Stefan Monnier
2012-06-30 12:07 ` Stefan Monnier
2012-06-30 13:14 ` Paul Eggert
2012-06-30 14:23 ` Stefan Monnier
2012-07-04 6:25 ` Paul Eggert
2012-07-04 16:39 ` Eli Zaretskii
2012-07-04 18:19 ` Paul Eggert
2012-07-05 16:31 ` Eli Zaretskii
2012-07-05 19:34 ` Eli Zaretskii
2012-07-06 0:08 ` Paul Eggert
2012-07-06 6:43 ` Eli Zaretskii
2012-07-06 7:32 ` Paul Eggert
2012-07-06 8:34 ` ptrdiff_t misuse Eli Zaretskii
2012-07-06 14:51 ` Paul Eggert
2012-07-06 21:30 ` Stefan Monnier
2012-07-06 21:33 ` Samuel Bronson
2012-07-07 10:59 ` Stefan Monnier
2012-07-07 15:34 ` Paul Eggert
2012-07-06 8:46 ` Eli Zaretskii
2012-07-06 10:19 ` Stephen J. Turnbull
2012-07-06 11:01 ` Eli Zaretskii
2012-07-06 12:02 ` Stephen J. Turnbull
2012-07-06 13:37 ` Eli Zaretskii
2012-07-06 16:25 ` Stephen J. Turnbull
2012-07-06 14:56 ` Paul Eggert
2012-07-06 15:43 ` Eli Zaretskii
2012-07-06 15:56 ` Paul Eggert [this message]
2012-07-06 16:00 ` Eli Zaretskii
2012-07-06 16:42 ` Dmitry Antipov
2012-07-06 17:39 ` Paul Eggert
2012-07-07 1:31 ` Chong Yidong
2012-06-29 18:54 ` ptrdiff_t misuse [was :Re: (empty)] Eli Zaretskii
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