From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Hua Zhong <hzhong@gmail.com>
Cc: "'Jiri Slaby'" <jirislaby@gmail.com>,
"'Heiko Carstens'" <heiko.carstens@de.ibm.com>,
"'Andrew Morton'" <akpm@osdl.org>,
linux-kernel@vger.kernel.org,
"'Martin Schwidefsky'" <schwidefsky@de.ibm.com>
Subject: RE: do { } while (0) question
Date: Tue, 01 Aug 2006 11:39:31 +0200 [thread overview]
Message-ID: <1154425171.32739.2.camel@taijtu> (raw)
In-Reply-To: <008e01c6b549$59e52f70$493d010a@nuitysystems.com>
On Tue, 2006-08-01 at 02:03 -0700, Hua Zhong wrote:
> > #if KILLER == 1
> > #define MACRO
> > #else
> > #define MACRO do { } while (0)
> > #endif
> >
> > {
> > if (some_condition)
> > MACRO
> >
> > if_this_is_not_called_you_loose_your_data();
> > }
> >
> > How do you want to define KILLER, 0 or 1? I personally choose 0.
>
> Really? Does it compile?
No, and that is the whole point.
The empty 'do {} while (0)' makes the missing semicolon a syntax error.
next prev parent reply other threads:[~2006-08-01 9:39 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-01 8:21 do { } while (0) question Heiko Carstens
2006-08-01 8:45 ` Jonathan Matthews-Levine
2006-08-01 8:53 ` Heiko Carstens
2006-08-01 16:26 ` Andrew James Wade
2006-08-01 8:49 ` Andrew Morton
2006-08-01 8:52 ` Jiri Slaby
2006-08-01 9:03 ` Hua Zhong
2006-08-01 9:39 ` Peter Zijlstra [this message]
2006-08-01 9:46 ` Jiri Slaby
2006-08-01 9:57 ` Russell King
2006-08-01 10:04 ` Jiri Slaby
2006-08-01 9:59 ` Peter Zijlstra
2006-08-01 10:03 ` Jiri Slaby
2006-08-01 14:49 ` Horst H. von Brand
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