Many, many warnings of the following type (g++ 3.2)... /home/jody/boost_1_32_0/libs/serialization/src/basic_iarchive.cpp: In member function `bool boost::archive::detail::basic_iarchive_impl::track(boost::archive::deta il::basic_iarchive&, void*&)': /home/jody/boost_1_32_0/libs/serialization/src/basic_iarchive.cpp:291: warning: choosing `boost::archive::object_id_type::operator unsigned int&()' over ` boost::archive::object_id_type::operator unsigned int() const' /home/jody/boost_1_32_0/libs/serialization/src/basic_iarchive.cpp:291: warning: for conversion from `boost::archive::object_id_type' to `unsigned int' /home/jody/boost_1_32_0/libs/serialization/src/basic_iarchive.cpp:291: warning: because conversion sequence for the argument is better /home/jody/boost_1_32_0/libs/serialization/src/basic_iarchive.cpp: In member function `void boost::archive::detail::basic_iarchive_impl::load_object(boost::archive ::detail::basic_iarchive&, void*, const boost::archive::detail::basic_iserializer&)':