#include <fstream>
#include <boost/archive/xml_oarchive.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/serialization/export.hpp>
#include <boost/serialization/nvp.hpp>
using namespace std;
#define NVP(x) BOOST_SERIALIZATION_NVP(x)

#include "base.h"

B* get_b();

//BOOST_CLASS_EXPORT(D);

int main()
{
    ofstream ofs("xxx");
    boost::archive::xml_oarchive oa(ofs);
    
    B* b = new D;
    oa << NVP(get_b());
    ofs.close();
    return 0;
}