Re: C99 variadic macros

From: John Baldwin (jhb_at_FreeBSD.org)
Date: 02/05/04

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    To: Stefan Farfeleder <stefan@fafoe.narf.at>
Date: Thu, 5 Feb 2004 15:44:48 -0500

    On Thursday 05 February 2004 03:04 pm, Stefan Farfeleder wrote:
    > On Thu, Feb 05, 2004 at 02:05:59PM -0500, John Baldwin wrote:
    > > On Thursday 05 February 2004 11:46 am, Stefan Farfeleder wrote:
    > > > #define foo(fmt, args...) printf("%s: " fmt "\n", __func__, ##args)
    > >
    > > C99 macros don't work when args is 0. I.e., if I did:
    > >
    > > foo("test");
    > >
    > > The C99 _VA_ARGS_ think doesn't delete the , whereas the GCC way does.
    >
    > While it's true that the ellipsis must match a positive number of
    > arguments, this isn't necessarily a problem. You just use "..." for
    > both the format string and its arguments.

    Not always easily done in my experience, though the 3 printf thing (ugh) might
    serve as a workaround as I didn't try that before when I've tried to use the
    C99 way. 

    -- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
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