rfc: macros accepting constructors

[Tim Hollebeek]

On Thu, Jun 27, 2002 at 10:02:32AM -0700, Aldy Hernandez wrote:
> 
> > Perhaps the best suggestion (if anything is desirable) is to modify
> > grammar so that ()'s are allowed around any grammar element which is
> > surrounded by {}'s.  Then all you have to do is remember to use ({ and
> 
> this already works.

I think you misunderstood.  The part of the grammar I was proposing to
modify was the C grammar, not the preprocessor grammar.  What I suggested
most definitely does NOT work right now:

d1.c: void foo(void) ({ int x, y; })
d2.c: int x[2] = ({ 0, 0 });

d1.c:1: parse error before `{'
d2.c:1: braced-group within expression allowed only inside a function

> but foo({1,2}) doesn't. 

What I'm proposing would allow foo({1,2}) to safely be rewritten as
foo(({1,2})) regardless of how the { ends up getting used.

-Tim