Re: [PATCH] Documentation: Explain a second alternative for multi-line macros.

["Robert P. J. Day" <rpjday@mindspring.com>]

On Mon, 1 Jan 2007, Segher Boessenkool wrote:

> > > In this case, the second form
> > > should be used when the macro needs to return a value (and you can't
> > > use an inline function for whatever reason), whereas the first form
> > > should be used at all other times.
> >
> > that's a fair point, although it's certainly not the coding style
> > that's in play now.  for example,
> >
> >   #define setcc(cc) ({ \
> >     partial_status &= ~(SW_C0|SW_C1|SW_C2|SW_C3); \
> >     partial_status |= (cc) & (SW_C0|SW_C1|SW_C2|SW_C3); })
>
> This _does_ return a value though, bad example.

sigh ... you're right.  here's a thought.  my original patch
submission simply added an explanation for allowing the ({ }) notation
for defining a multi-line macro, without getting into recommending an
actual coding style.  at a minimum, something like that should be
added to the style document.

if someone wants to extend that explanation recommending *when* each
of those two styles should be used, feel free.  but a simple
decription of alternatives should *at least* be added, no?

rday
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/