Date: Sat, 26 Feb 2000 23:23:24 +0200 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: cjclark@home.com Cc: Alfred Perlstein <bright@wintelcom.net>, Marco Molteni <molter@csl.sri.com>, freebsd-chat@FreeBSD.ORG Subject: Re: how to do this C preprocessor trick? Message-ID: <20000226232324.C99617@hades.hell.gr> In-Reply-To: <20000226003741.C20702@cc942873-a.ewndsr1.nj.home.com>; from cjc@cc942873-a.ewndsr1.nj.home.com on Sat, Feb 26, 2000 at 12:37:41AM -0500 References: <20000225182432.A5017@sofia.csl.sri.com> <20000226001121.A20702@cc942873-a.ewndsr1.nj.home.com> <20000225214616.U21720@fw.wintelcom.net> <20000226003741.C20702@cc942873-a.ewndsr1.nj.home.com>
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On Sat, Feb 26, 2000 at 12:37:41AM -0500, Crist J. Clark wrote:
>
> Why a,
>
> do { <stuff> } while(0)
>
> Rather than just,
>
> { <stuff> }
>
> That's how I group multi-statement macros, but that does not work for
> this one.
One fairly good reason that I can clearly remember is that, with the
extra do { .. } while (0) wrapping, one gets the extra benefit of being
able to define properly scoped local variables within the macro body.
--
Giorgos Keramidas, < keramida @ ceid . upatras . gr >
For my public PGP key: finger keramida@diogenis.ceid.upatras.gr
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