I already sent a message on this topic a few weeks ago, however, my problem has a changed a bit so I decided to post a new message. I've been trying to get Boost serialization working for dynamically loaded shared libraries. Here's my basic structure simplified: 1. base.hpp - includes an abstract base class called base 2. derived.hpp - includes a derived class from base. includes base.hpp. 3. derived.cpp - includes code for derived class and for dynamically loading it 4. main.cpp - includes base.hpp but NOT derived.hpp. dynamically loads instantiates a base * which points to a derived object from derived.so Now in main I want to be able to serialize my pointer to the loaded derived class: base *obj = create_func(); //obj now points to a derived object obj->test(); //when test is run it correctly outputs the message from derived.cpp const base* const to_serialize = obj; std::ofstream ofs("filename"); boost::archive::text_oarchive oa(ofs); try { oa << (to_serialize); } catch(exception &e) { cout << "Exception: " << e.what() << "\n"; } It compiles fine and I got past the "unregisterd class" problem, but now when I try to serialize the pointer an exception is caught: "Unregistered void cast" This appears to be a problem with registering the derived pointer type from the base type when dynamically loaded from a shared library. However, I do register the derived-base relationship as suggested in the documentation. The serialize method in derived.hpp is as follows: template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar.template register_type(static_cast<derived *>(NULL)); //ar & boost::serialization::base_object<base>(*this); ar & data; boost::serialization::void_cast_register( static_cast<derived *>(NULL), static_cast<base *>(NULL) ); } If anyone knows the cause of this and/or a solution I would be very appreciative. I've been working at this for a long time now and I'm almost ready to write my own simple serialization for my specific purpose. Thank you for your help, Jeshua Bratman -- View this message in context: http://www.nabble.com/-boost%3A%3Aserialization--Serializing-Dynamically-Loa... Sent from the Boost - Users mailing list archive at Nabble.com.