id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
929,BOOST_RE_USE_FACET macro def wrong,chuckm,John Maddock,"{{{
When using STLPort (4.1 beta 6) with VC6, the 
BOOST_RE_USE_FACET() macro definition is wrong.  I've 
been unable to trace how it gets to be this way, but 
here's an example of the problem.  In 
cpp_regex_traits.cpp, we have:

    const std::messages<char>* pm = &BOOST_RE_USE_FACET
(l, std::messages<char>);

This gets expanded by the preprocessor to:

    const _STL::messages<char>* pm = &_STL::*_Use_facet
(l, (_STL::messages<char>*)0, true);

Note that STLPort defines std to _STL.  That's nothing 
to worry about.  The problem is 
that ""_STL::*_Use_facet"" is a syntax error.

I tried tracking this down in regex_config.hpp, but 
got lost.  Here are all the possible definitions for 
BOOST_RE_USE_FACET:

    #define BOOST_RE_USE_FACET(l, m) 
(*std::_Use_facet<m >(l))

This can't be the one being used -- the * is in the 
wrong place.  I'd expect it to come just before the 
_Use_facet.

    #define BOOST_RE_USE_FACET(l, type) std::use_facet
(l, (type*)0, true)

This is obviously not it.

    #define BOOST_RE_USE_FACET(l, type) std::use_facet
(l, (type*)0)

Neither is this.

    #define BOOST_RE_USE_FACET(l, type) 
std::use_facet< type >(l)

Niether is this.

    #define BOOST_RE_USE_FACET(l, type) std::use_facet
(l, (type*)0)

Nor this.

So, I'm unable to figure out how the preprocessor is 
ending up with a * just in front of _Use_facet.  It's 
pretty hard to debug the preprocessor!

So, as it stands, something is broken.  Whether it's 
VC6 or regex_config.hpp, I can't tell...
}}}",Bugs,closed,,regex,None,,Fixed,,