The base class MUST be polymorphic - that is have at least one virtual function. AND the the pointer to the base class - not the derived class should be serialized. Robert Ramey #include "stdafx.h" #include "stdafx.h" #include <sstream> // include headers that implement a archive in simple text format #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/export.hpp> class base { public: base(){ m_val = 1; } void PrintVal( void ) { printf(" Value: %d\n", m_val ); } protected: // note:make polymporphic virtual void foo(void) = 0; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int file_version){ ar & m_val; } int m_val; }; class derived : public base { public: derived(){ m_val = 2; } private: void foo(void){} friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int file_version){ boost::serialization::base_object<base>(*this); } }; BOOST_CLASS_EXPORT_GUID(derived, "derived") void test4(){ std::stringstream ss; boost::archive::text_oarchive oa(ss); const base *b = new derived(); b->PrintVal(); oa & b; boost::archive::text_iarchive ar(ss); b = NULL; ar & b; b->PrintVal(); } int main() { test4(); return 0; } ------------------------------------------------------------------------------ _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users