#include <cassert>
#include <fstream>
#include <iostream>

#include <boost/serialization/serialization.hpp>
#include <boost/archive/xml_oarchive.hpp>
#include <boost/archive/xml_iarchive.hpp>
#include <boost/serialization/export.hpp>

#include <boost/serialization/nvp.hpp>

struct A {
    virtual ~A() {}
    virtual void foo() {}
    friend class boost::serialization::access;
    template<class Archive>
    void serialize(Archive &/*ar*/, const unsigned int /*version*/) {
    }
};

struct B : virtual A {
    friend class boost::serialization::access;
    template<class Archive>
    void serialize(Archive &ar, const unsigned int /*version*/) {
        ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(A);
    }
};

struct C : B {
    virtual void foo() { std::cout << "C" << std::endl; }
    friend class boost::serialization::access;
    template<class Archive>
    void serialize(Archive &ar, const unsigned int /*version*/) {
        ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(B);
    }
};

BOOST_CLASS_EXPORT(C)

int main()
{
    {
        std::ofstream ofs("outtarget.xml");
        boost::archive::xml_oarchive oa(ofs);
        assert(ofs);
        A* pA = new C;
        oa << boost::serialization::make_nvp("A", pA);
    }
    {
        std::ifstream ifs("outtarget.xml");
        assert(ifs);
        boost::archive::xml_iarchive ia(ifs);
        A* pA;
        ia >> boost::serialization::make_nvp("A", pA);
        pA->foo();
    }
}