Hi, i just recently startet to dip into boost::serialization. In the examples directory, there is demo.cpp, in which text_archive is used. From my understanding of the tutorial ("In addition to text archives, the library includes archive class for native binary data and xml formatted data Interfaces to all archive classes are all identical.") it should be possible to switch from text_archive to xml_archive by just replacing text_[io]archive by xml_[io]archive and include the required header files. However, when I do this, I'm getting lots of compiler error messages like (Linux, gcc-4.1.2, boost-1.35.0) /usr/include/boost-1_35/boost/archive/basic_xml_oarchive.hpp: In member function 'void boost::archive::basic_xml_oarchive<Archive>::save_override(T&, int) [with T = const bus_schedule, Archive = boost::archive::xml_oarchive]': /usr/include/boost-1_35/boost/archive/detail/interface_oarchive.hpp:64: instantiated from 'Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = const bus_schedule, Archive = boost::archive::xml_oarchive]' demo-using-xml.cpp:286: instantiated from here /usr/include/boost-1_35/boost/archive/basic_xml_oarchive.hpp:88: error: no matching function for call to 'assertion_failed(mpl_::failed************ boost::serialization::is_wrapper<const bus_schedule>::************)' /usr/include/boost-1_35/boost/archive/basic_xml_iarchive.hpp: In member function 'void boost::archive::basic_xml_iarchive<Archive>::load_override(T&, int) [with T = bus_schedule, Archive = boost::archive::xml_iarchive]': /usr/include/boost-1_35/boost/archive/xml_iarchive.hpp:74: instantiated from 'void boost::archive::xml_iarchive_impl<Archive>::load_override(T&, int) [with T = bus_schedule, Archive = boost::archive::xml_iarchive]' /usr/include/boost-1_35/boost/archive/detail/interface_iarchive.hpp:63: instantiated from 'Archive& boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T = bus_schedule, Archive = boost::archive::xml_iarchive]' demo-using-xml.cpp:297: instantiated from here The original demo.cpp however compiles fine. The difference to the version using xml_archive is just: --- demo.cpp 2008-08-11 18:06:45.394403000 +0200 +++ demo-using-xml.cpp 2008-08-12 07:33:33.147259000 +0200 @@ -14,8 +14,8 @@ #include -#include -#include +#include +#include #include #include @@ -282,7 +282,7 @@ void save_schedule(const bus_schedule &s, const char * filename){ // make an archive std::ofstream ofs(filename); - boost::archive::text_oarchive oa(ofs); + boost::archive::xml_oarchive oa(ofs); oa << s; } @@ -291,7 +291,7 @@ { // open the archive std::ifstream ifs(filename); - boost::archive::text_iarchive ia(ifs); + boost::archive::xml_iarchive ia(ifs); // restore the schedule from the archive ia >> s; @@ -352,7 +352,7 @@ std::cout << original_schedule; std::string filename(boost::archive::tmpdir()); - filename += "/demofile.txt"; + filename += "/demofile.xml"; // save the schedule save_schedule(original_schedule, filename.c_str()); What am I doing wrong? Thanks, Markus Schwarzenberg