Just isn't working in 1.35. With the examples included and following this documentation: http://www.boost.org/doc/libs/1_35_0/libs/serialization/doc/derivation.html I get link errors if I don't include #include and compile errors if I do: impl/basic_binary_oprimitive.ipp: In member function ‘virtual int boost::archive::detail::output_streambuf_access::sync()’: impl/basic_binary_oprimitive.ipp:137: error: expected primary-expression before ‘,’ token impl/basic_binary_oprimitive.ipp:137: error: expected primary-expression before ‘>’ token binary_oarchive_impl.hpp:31: instantiated from here class boost::archive::detail::output_streambuf_access’ has no member named ‘basic_streambuf Am I doing something wrong? The examples don't compile so no wonder mine doesn't! Has anyone got this to work (in Boost 1.35)? I am using g++ 4.1.2 on Linux. My code: // Boost containers, algorithms etc. #include #include // Boost containers, algorithms etc. using boost::archive::save_access; using boost::archive::binary_oarchive_impl; using boost::archive::basic_binary_oarchive; using boost::archive::basic_binary_oprimitive; typedef ostream::char_type ctype; typedef ostream::traits_type ttype; template<class Archive> class binary_net_oarchive : public binary_oarchive_impl { public: friend class save_access; friend class basic_binary_oarchive<Archive>; friend class binary_oarchive_impl; friend class basic_binary_oprimitive; typedef binary_oarchive_impl base_bin_t; public: binary_net_oarchive(ostream &p_stream) : base_bin_t(p_stream, 0) { } template<class Type> void save(const Type &p_t) { base_bin_t::save(p_t); } }; #include #include #include namespace boost { namespace archive { using namespace fq::comms; template class binary_oarchive_impl; template class detail::archive_pointer_oserializer; } } #define BOOST_ARCHIVE_CUSTOM_OARCHIVE_TYPES base_msg Regards, Jim -- James Vanns Systems Programmer Framestore CFC Ltd.