The title says it all: the Mac OS X system headers are inconsistent about the minimum value of a wchar_t. The C++ <limits> header has it right, but the definition of WCHAR_MIN in <cwchar>/<wchar.h> is wrong (0). If there are no complains, I'm going to commit the following patch. I don't believe this will affect CodeWarrior on the Mac, but I can't test against it. Index: integer_traits.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/integer_traits.hpp,v retrieving revision 1.26 diff -u -r1.26 integer_traits.hpp --- integer_traits.hpp 17 Dec 2004 11:56:15 -0000 1.26 +++ integer_traits.hpp 6 May 2005 15:46:36 -0000 @@ -88,7 +88,9 @@ template<> class integer_traits<wchar_t> : public std::numeric_limits<wchar_t>, -#if defined(WCHAR_MIN) && defined(WCHAR_MAX) + // Don't trust WCHAR_MIN and WCHAR_MAX with Mac OS X's native + // library: they are wrong! +#if defined(WCHAR_MIN) && defined(WCHAR_MAX) && !defined(__APPLE__) public detail::integer_traits_base<wchar_t, WCHAR_MIN, WCHAR_MAX> #elif defined(__BORLANDC__) || defined(__CYGWIN__) || defined(__MINGW32__) || (defined(__BEOS__) && defined(__GNUC__)) // No WCHAR_MIN and WCHAR_MAX, whar_t is short and unsigned: Doug