From: Ken Raeburn <raeburn@raeburn.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: grischka <grishka@gmx.de>, emacs-devel@gnu.org
Subject: Re: enum may be signed
Date: Sat, 1 May 2010 14:37:00 -0400 [thread overview]
Message-ID: <B61270D4-2B13-4234-BF81-A7CE1DA4E18F@raeburn.org> (raw)
In-Reply-To: <jwvmxwjo6gr.fsf-monnier+emacs@gnu.org>
On May 1, 2010, at 13:56, Stefan Monnier wrote:
> Interesting. I didn't know about that part of the C language. Is it
> possible to specify that this is an unsigned enum somehow?
Not really... nothing in standard C supports it (in fact IIRC it doesn't allow enum bitfields anyways, but that's a common extension), and anything MSVC-specific won't help when the next such compiler comes along.
> Of course we can add one more bit (we have plenty of bits left there),
> but I'd first like to know how this is usually handled, since it seems
> to imply that MSVC always requires one extra bit to store enums.
I think adding the extra bit and using "unsigned int" bitfields are the two usual ways to deal with it.
Ken
next prev parent reply other threads:[~2010-05-01 18:37 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-01 15:47 enum may be signed grischka
2010-05-01 17:56 ` Stefan Monnier
2010-05-01 18:37 ` Ken Raeburn [this message]
2010-05-01 18:51 ` grischka
2010-05-03 17:04 ` Tom Tromey
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