I don't know if this is the right forum for that... In the following example I get the compile error (VS2005) Error 1 error C2027: use of undefined type 'boost::STATIC_ASSERTION_FAILURE<x>' c:\boost_1_33_1\boost\archive\detail\oserializer.hpp 567 Can anyone say me why? If I define const gps_position it works, otherwhise it fails class gps_position { private: friend class boost::serialization::access; // When the class Archive corresponds to an output archive, the // & operator is defined similar to <<. Likewise, when the class Archive // is a type of input archive the & operator is defined similar to >>. template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & degrees; ar & minutes; ar & seconds; } int degrees; int minutes; float seconds; public: gps_position(){}; gps_position(int d, int m, float s) : degrees(d), minutes(m), seconds(s) {} }; int _tmain(int argc, _TCHAR* argv[]) { gps_position newVector; const gps_position* poldVector = new gps_position(); { std::ofstream ofs("test.dat"); boost::archive::text_oarchive oa(ofs); oa << poldVector; } { std::ifstream ifs("test.dat", std::ios_base::binary); boost::archive::text_iarchive ia(ifs); ia >> newVector; // read data } return 0; } _______________________________________________________________ SMS schreiben mit WEB.DE FreeMail - einfach, schnell und kostenguenstig. Jetzt gleich testen! http://f.web.de/?mc=021192