From: Ken Raeburn <raeburn@raeburn.org>
To: Emacs Dev <emacs-devel@gnu.org>
Subject: Re: Proposal: immediate strings
Date: Thu, 24 May 2012 01:41:14 -0400 [thread overview]
Message-ID: <2E06A9F9-C4C2-49E4-8E09-17AC0F1AE686@raeburn.org> (raw)
In-Reply-To: <jwvk402dvsf.fsf-monnier+emacs@gnu.org>
On May 24, 2012, at 01:17, Stefan Monnier wrote:
>> +#define SDATA(string) (XSTRING (string)->u.imm.immbit ? \
>> + (XSTRING (string)->u.imm.data + 0) : \
>> + (XSTRING (string)->u.dat.data + 0))
>
> IIUC the "+ 0" are unneeded here, because using a "..?..:.." already
> makes sure we have an rvalue. Same for SCHARS.
FWIW, there used to be a GCC extension that caused the ternary operator to be an lvalue if both the second and third operands were lvalues. I'm not sure when it was removed; possible in 4.0, which might be old enough that we can ignore it...
Ken
next prev parent reply other threads:[~2012-05-24 5:41 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-22 8:44 Proposal: immediate strings Dmitry Antipov
2012-05-22 20:51 ` Miles Bader
2012-05-22 22:13 ` Paul Eggert
2012-05-24 5:17 ` Stefan Monnier
2012-05-24 5:41 ` Ken Raeburn [this message]
2012-05-24 5:50 ` Miles Bader
2012-05-24 6:08 ` Paul Eggert
2012-05-24 7:14 ` Stefan Monnier
2012-05-24 7:52 ` Paul Eggert
2012-05-24 12:51 ` Stefan Monnier
2012-05-24 16:35 ` Paul Eggert
2012-05-25 6:43 ` Dmitry Antipov
2012-05-25 7:30 ` Paul Eggert
2012-05-28 11:32 ` Dmitry Antipov
2012-05-28 14:25 ` Stefan Monnier
2012-05-29 6:55 ` Dmitry Antipov
2012-05-29 7:38 ` Paul Eggert
2012-05-29 13:33 ` Dmitry Antipov
2012-05-29 15:24 ` Paul Eggert
2012-05-31 9:28 ` Dmitry Antipov
2012-05-31 16:34 ` Paul Eggert
2012-06-06 6:14 ` Dmitry Antipov
2012-06-06 6:41 ` Paul Eggert
2012-06-06 7:29 ` Dmitry Antipov
2012-06-06 15:14 ` Eli Zaretskii
2012-06-06 21:44 ` Paul Eggert
2012-07-04 8:27 ` Old topic(s) again [was: Re: Proposal: immediate strings] Dmitry Antipov
2012-07-04 13:08 ` Stefan Monnier
2012-07-04 19:32 ` Paul Eggert
2012-05-29 7:38 ` Proposal: immediate strings Andreas Schwab
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