I have got one more question. If I were to use class A in some .cpp file, where I am not interested in serialization, do I still need to include serialization/archive/.. headers in that .cpp? Is it posssible to avoid that? ----------------------------------------------------------------------- A.h #include <boost/serialization/version.hpp> #include <boost/serialization/export.hpp> namespace boost { namespace serialization { class access; } } class A { }; BOOST_CLASS_VERSION(A, 1) BOOST_CLASS_EXPORT(A) ----------------------------------------------------------------------- A.cpp #include <boost/archive/polymorphic_archive.hpp> #include "A.h" <<implementation> ----------------------------------------------------------------------- B.cpp <<<<===== #include <boost/archive/polymorphic_archive.hpp>???? #include "A.h" void B::foo() { A a; a.DoSomething(); } ------------------------------------------------------------------------ Thank you very much in advance! Mikhail