[Boost-users] Serialization about polymorphism

From: Ng Pan (panng_wts_at_[hidden])
Date: 2007-05-21 06:08:08

Hi

I am facing a problem about serialization. There are several objects 
constructed from class base1. And I want to serialize/deserialize only the 
member attribute "m_nID" from these objects. That's why only class base is 
registered.

My problem is that when I try to serialize the objects construct from class 
base1, error message "unregistered_class" is throwed.

It doesn't have such problem if the class base doesn't inherented from class 
blackbox. As I know the class blackbox is also using boost library, but I 
don't which part it is using.

I have tryed to use marco
BOOST_CLASS_EXPORT_GUID(base, "Base")

but seems not useful in this case.

---------------------------------------------------------------------

class base: public blackbox
{
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive &ar, const unsigned int /* file_version */){
   ar & boost::serialization::make_nvp("ComponentID", m_nID);
    }
....
private:
unsigned int m_nID;
};

class base1: public base
{
//friend class boost::serialization::access;
//template<class Archive>
//void serialize(Archive &ar, const unsigned int /* file_version */){
//   ar & boost::serialization::make_nvp("ComponentID", m_nID);
//   ar & boost::serialization::make_nvp("BaseInt", m_nBInt);
//    }
....
};

Regards
Barr Ng

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