c++: Boost 1.48 type traits and Cocoa inclusion weirdness

Question

I just updated boost to version 1.48.0 on a project i am developing on OSX Lion that also includes the Cocoa headers. After doing so I got a load of errors all pointing to has_p

Answer 1

I had essentially the same problem, and with the clue from ildjam, I found the cause and a work-around.

The (terrible) macro name is check, defined in AssertMacros.h. According to the comments in that file, in the future Apple will remove the old names. For now Apple have added a work-around to suppress the old names which is to define __ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES to 0 before AssertMacros.h is processed. e.g.

#define __ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES 0
#import 

If you use a prefix file, then you could put the definition there. Alternatively, a direct work-around is to undef check before including type_traits.hpp.

#ifdef check
#undef check
#endif
#include "boost/type_traits.hpp"

(Details submitted to Boost Trac too: https://svn.boost.org/trac/boost/ticket/6219 )