[Boost-users] Serializing using base pointer gives "unregistered void cast" exception

Class hiarchy: --- Event EventNotification EventNotificationUser --- Each class calls boost::serialization::base_object<...>(*this); and has BOOST_CLASS_EXPORT_GUID(..., "...") at the end of their header.

From what I can gather from the manual this is what's needed for boost to know the types and be able to serialize them, but I still get "unregistered void cast" exception when I do this:

EventNotificationUser e; Event* ep = &e; ar & ep; Thanks, Christian