This is a question of instantiations. If A.cpp doesn't refer to a specific archive (e.g. text_?archive) the

code won't be generated. One way to do this for A.cpp is include the following at the end of the code:

"Fred Lupien" <fred.lupien@gmail.com> wrote in message news:32e6d6bf0709301357md97df93pa65405cefcb2cd05@mail.gmail.com...
Honestly I have been looking for a solution for hours before I made this post. I am not so familiar with boost, the only module I use is serialization so maybe my error is obvious but I went through all the doc on boost.org without luck.

I should have been more descriptive I my first post. I does not work because I get unresolved externals on the base class save / load functions when I implement the derived class save/load functions. I am using the intrusive version of serialization so their should be no particular namespace requirement. Here is a simplified example of my problem:

///////////////////////////////////// A.h
Class A:
{
    friend class boost::serialization::access;
    template<class Archive>
    void save(Archive & ar, const unsigned int version) const;
    template<class Archive>
    void load(Archive & ar, const unsigned int version);

    BOOST_SERIALIZATION_SPLIT_MEMBER()

};
/////////////////////////////////////

///////////////////////////////////// B.h
class B: public A
{
    friend class boost::serialization::access;
    template<class Archive>
    void save(Archive & ar, const unsigned int version) const;

    template<class Archive>
    void load(Archive & ar, const unsigned int file_version );

    BOOST_SERIALIZATION_SPLIT_MEMBER()
}
BOOST_CLASS_EXPORT_GUID(B, "B")
/////////////////////////////////////

///////////////////////////////////// A.cpp

template<class Archive>
void A::save(Archive & ar, const unsigned int version) const
{
    ar & var1;
}

template<class Archive>
void A::load(Archive & ar, const unsigned int file_version )
{
    ar & var;
    somestuff();
}

/////////////insert explicit instantiation for text archives /////////

#include <boost/archive/text_iarchive.hpp>

#include <boost/archive/text_iarchive.hpp>

template void A::load<boost::archive::text_iarchive>(boost::archive::text_iarchive & ar, const unsigned int file_version );
template void A::save<boost::archive::text_oarchive>(boost::archive::text_oarchive & ar, const unsigned int file_version );

/////////////////////////////////////