Hi, we discovered a compiler bug using Visual C++ 8.0 (SP1). This bug makes boost namespace items visible in the global namespace and so makes boost libraries conflict with other libraries. The following example [1] displays how this bug can make namespace items public. When moving the exception class definition outside the namespace everything works as expected. We encountered this problem when using boost::integer in combination with boost::serialization. After including the file shared_count_132.hpp all boost::integer types are public and conflict with other libraries. This leads to the problem shown in the example [0]. The uint32_t type is publicly visible. To our knowledge this bug is present in Visual C++ 8.0 (SP1). Visual C++ 9.0 does not show this bug anymore. [0] #include <boost/cstdint.hpp> #include <boost\serialization\detail\shared_count_132.hpp> int main(int argc, char **argv) { uint32_t hallo; // this should not be possible } [1] #include <stdexcept> namespace fu { typedef unsigned int uint32_fu; } // namespace fu namespace fu2 { using namespace fu; class bad_weak_ptr: public std::exception {}; namespace detail{ class sp_counted_base { void add_ref_lock() { throw bad_weak_ptr(); } }; } } int main(int argc, char **argv) { uint32_fu hallo; } -chris -- Christopher Lux | | Bauhaus-Universität Weimar | Faculty of Media - Virtual Reality Systems Group