Hi, I try to serialize a derived object by its base class pointer to an archive I derived from xml_oarchive_impl exactly the same way as it is documented in the example code here: http://www.boost.org/doc/libs/1_47_0/libs/serialization/example/log_archive.... http://www.boost.org/doc/libs/1_47_0/libs/serialization/example/log_archive.... However, when I start the program (to output to my derived archive) I get the assertion (“BOOST_ASSERT(false)”) in the following method in “basic_serializer_map.cpp” (I checked with the debugger (VS2010) and found the m_map.size() is 0). BOOST_ARCHIVE_DECL(const basic_serializer *) basic_serializer_map::find( const boost::serialization::extended_type_info & eti ) const { const basic_serializer_arg bs(eti); map_type::const_iterator it; it = m_map.find(& bs); if(it == m_map.end()){ BOOST_ASSERT(false); return 0; } return *it; } If I use the DERIVED class pointer it works fine with my own derived archive. If I use a BASE class pointer and use the ORIGINAL xml_oarchive it works fine too. Only when I combine both (using my own derived archive AND try to serialize through a base class pointer) it fails with the assertion. Here is an excerpt of my code and 3 cases, where the first and second work fine and the third asserts: THIS WORKS FINE: int _tmain(int argc, _TCHAR* argv[]) { Base* bptr = new Derived; // using base class ptr boost::archive::xml_oarchive oa(std::cout, boost::archive::no_header); // using original archive from boost::serialization oa & BOOST_SERIALIZATION_NVP(bptr); return 0; } THIS WORKS FINE TOO: int _tmain(int argc, _TCHAR* argv[]) { Derived* dptr = new Derived; // using derived class ptr log_archive oa(std::cout, boost::archive::no_header); // using derived archive oa & BOOST_SERIALIZATION_NVP(dptr); return 0; } THIS ASSERTS: int _tmain(int argc, _TCHAR* argv[]) { Base* bptr = new Derived; // using base class ptr log_archive oa(std::cout, boost::archive::no_header); // using derived archive oa & BOOST_SERIALIZATION_NVP(bptr); return 0; } Is there something I can do to get my derived archive correctly working or doesn’t support the boost::serialization lib the combination of deriving archives and serializing via base class pointers at the same time? One more hint: using the debugger I saw that the m_map member in "basic_serializer_map.hpp" is statically initialized before main() is started. Some information for all my derived classes which contain serialization-methods where inserted into m_map. So m_map isn't actually empty but it seems to be a different object than the one where m_map has been initialized. Cheers, Frank -- View this message in context: http://boost.2283326.n4.nabble.com/serialization-can-t-serialize-to-derived-... Sent from the Boost - Users mailing list archive at Nabble.com.