On Wed, 11 Jul 2012, Joe Perches wrote:
> On Wed, 2012-07-11 at 13:32 -0400, Robert P. J. Day wrote:
> []
> > diff --git a/Documentation/CodingStyle b/Documentation/CodingStyle
> []
> > +A newer technique is to use the GCC extension of being able to place
> > +statements and declarations in an expression, as with this example from
> > +the <linux/kernel.h> header file:
> > +
> > +#define roundup(x, y) ( \
> > +{ \
> > + const typeof(y) __y = y; \
> > + (((x) + (__y - 1)) / __y) * __y; \
> > +} \
> > +)
>
> Hi Robert.
>
> How about the phrase "GCC's statement expression extension"
> or maybe give a link like:
> http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html
ok, i'll do that later today.
> Please put the opening ({ and closing )} on a single line.
> It's shorter and makes grep easier.
>
> #define statement_expression(args) \
> ({ \
> etc \
> })
i was simply transcribing what was in kernel.h verbatim, but i'll
tuck it together for brevity.
rday
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Robert P. J. Day Ottawa, Ontario, CANADA
http://crashcourse.ca
Twitter: http://twitter.com/rpjday
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