Hello, I'm having an issue with serializing derived classes from a base class pointer. I think I've narrowed it down to the simplest possible code. I get an "unregistered class" exception at runtime even though I've registered the derived class with BOOST_CLASS_EXPORT. Here's the code: ---------------------------------------------- main.cpp: #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <sstream> #include "A.hpp" #include "X.hpp" int main() { std::stringstream ss; const A * const test = new X; { boost::archive::text_oarchive oa(ss); oa << test; } A *test2; { boost::archive::text_iarchive ia(ss); ia >> test2; } return 0; } ----------------------------------------------- A.hpp: #pragma once #include <boost/serialization/access.hpp> class A { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int) { ar & test; } int test; public: A() : test(0) {} virtual ~A() {} }; ----------------------------------------------- X.hpp: #pragma once #include <boost/serialization/base_object.hpp> #include "A.hpp" class X : public A { friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int) { ar & boost::serialization::base_object<A>(*this); } }; ------------------------------------------------ X.cpp: #include "X.hpp" #include <boost/serialization/export.hpp> BOOST_CLASS_EXPORT(X) ----------------------------------------------- As you can see, I don't have BOOST_CLASS_EXPORT in the X.hpp header. This is the way I originally had it but then I got multiple definition link errors when more than one class derived from A. The suggestion in the serialization docs was to move the macro to a .cpp file. Full output when I run this: terminate called after throwing an instance of 'boost::archive::archive_exception' what(): unregistered class Aborted (core dumped) Any help would be appreciated greatly, Avery