From: Paul Eggert <eggert@cs.ucla.edu>
To: Bruno Haible <bruno@clisp.org>
Cc: bug-gnulib@gnu.org
Subject: Re: intptr_t vs. uintptr_t
Date: Fri, 13 Dec 2019 19:19:46 -0800 [thread overview]
Message-ID: <5120e6e1-1116-dc47-292f-d721014e3aea@cs.ucla.edu> (raw)
In-Reply-To: <2169340.l2UmpkpDhn@omega>
On 12/13/19 6:35 PM, Bruno Haible wrote:
> "Prefer intptr_t for internal representations of pointers"
>
> I disagree with this advice. uintptr_t ought to be used for representing the
> address of a pointer.
It depends on the application. For example, with two char * pointers P and Q
into an array, it can be helpful that P - Q yields the same integer as
((intptr_t) P - (intptr_t) Q), assuming the usual representation. That's not
true for uintptr_t.
In practice, Emacs uses uintptr_t quite a bit for things like hashes and tags;
but it uses intptr_t a bit more, so the advice seems reasonable for Emacs.
next prev parent reply other threads:[~2019-12-14 3:20 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-22 23:06 [PATCH] grep: a kwset matcher not work in a grep matcher Norihiro Tanaka
2019-03-23 2:49 ` bug#34951: " Norihiro Tanaka
2019-03-23 2:58 ` Budi
2019-03-23 2:59 ` Budi
2019-03-23 12:39 ` Eric Blake
2019-03-29 10:58 ` arnold
2019-12-11 23:25 ` Paul Eggert
2019-12-12 7:23 ` arnold
2019-12-12 7:31 ` arnold
2019-12-12 7:47 ` arnold
2019-12-12 22:26 ` Paul Eggert
2019-12-13 8:09 ` arnold
2019-12-13 12:08 ` arnold
2019-12-13 17:53 ` Jim Meyering
2019-12-13 20:00 ` Paul Eggert
2019-12-14 2:35 ` intptr_t vs. uintptr_t Bruno Haible
2019-12-14 3:19 ` Paul Eggert [this message]
2019-12-14 9:14 ` Bruno Haible
2019-12-14 22:29 ` Paul Eggert
2019-12-15 0:35 ` Bruno Haible
2019-12-16 10:02 ` Paul Eggert
2019-12-15 8:14 ` bug#34951: [PATCH] grep: a kwset matcher not work in a grep matcher arnold
2019-12-16 9:56 ` Paul Eggert
2019-12-16 10:12 ` arnold
2019-12-20 3:18 ` Paul Eggert
2019-12-20 10:35 ` arnold
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