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From: Dave Steffen (dgsteffen_at_[hidden])
Date: 2005-06-30 16:55:49

Gen Zhang writes:
> On Thu, 2005-06-30 at 08:30 -0400, David Abrahams wrote:
> > Dave Steffen <dgsteffen_at_[hidden]> writes:
> >
> > > I claim that our macros and use thereof is A) correct and B) safe.
> > > It just so happens that these macro constructs occasionally expand to
> > > something that has an extra semicolon, which triggers a warning in
> > > GCC 3.4 that we haven't seen before.
> >
> > The warning will be an error on other compilers. The semicolons
> > aren't just "bad style;" they're illegal.
> I believe The Book specifically allows an optional semicolon at the end
> of a function declaration in the global scope. They are illegal in a
> class. And necessary at the end of a class/struct definition. I have a
> friend who runs into this problem a lot. :D

 Yeah, this is one question - is it legal?

 If so, the next question is : can we find anything to stick on the
 end of these macros to make it legal? For example, I think a
 variable declaration might be OK there. So maybe we do something
 like having the macro expand into (this is nasty, but it might work)

 int Foo() { ... } int i_am_a_variable_at_line_970_of_file_X

 in which case a trailing semicolon would be perfectly at home.

 Of course, this is rather nasty for all kinds of reasons. Is there a
 way to make a "null declaration"? :-)

Dave Steffen, Ph.D. "There are two ways to write error-free
Software Engineer IV programs; only the third one works."
Numerica Corporation
ph (970) 419-8343 x27 "Pie are not square. Pie are round.
fax (970) 223-6797 Cornbread are square"
dgsteffen_at_[hidden] ... anon (usenet)
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