Francois wrote:

I am trying to use the serialization library to save an object and a pointer to the object, but the pointer has the type of the object's base class. Something like:

// declaration MyClass myObject; // object, not pointer MyBaseClass *myPointer = &myObject;

// serialization code ar & BOOST_SERIALIZATION_NVP(myObject); ar & BOOST_SERIALIZATION_NVP(myPointer);

And I get an exception (either null reference exception or access violation) during the deserialization. I am using xml archives. The xml generated code seems fine.

I would expect and "unregistered_class" exception on both serialization and de-serialization. If objects are to be serialized through a base class pointer, they must either: a) Be previously serialized directly or through the derived class pointer. or b) be "forward registered" with the archive. Or c) be "exported" via BOOST_CLASS_EXPORT

template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(Base); // What is the intended purpose for the following? // I can't see why one would want to do this. /* uncomment to avoid the exception * ar & BOOST_SERIALIZATION_NVP(this); */ } };

Robert Ramey