Hi @all I have a question to BOOST_CLASS_EXPORT_GUID(...) We have a lot of (derived) classes and want to register them by using BOOST_CLASS_EXPORT_GUID(...). Right now we do it like this: *** "main.cpp" *** ... #include "./../RCFExportForSerializedBasePtr.h" ... int main() { ... } *** "RCFExportForSerializedBasePtr.h" *** #include <boost/serialization/export.hpp> BOOST_CLASS_EXPORT_GUID(GbObject2D,"GbObject2D") BOOST_CLASS_EXPORT_GUID(GbCircle2D,"GbCircle2D") BOOST_CLASS_EXPORT_GUID(GbRectangle2D,"GbRectangle2D") BOOST_CLASS_EXPORT_GUID(AMR2DInteractor,"AMR2DInteractor") BOOST_CLASS_EXPORT_GUID(D2Q9AMRInteractor,"D2Q9AMRInteractor") ... But what we want to have the macro BOOST_CLASS_EXPORT_GUID(...) at the end of the header file of the derived class. That makes a lot of things much more easy. We tried that half a year ago and it doesn't work (we got errors, but I cannot say which one right now). Is this possible in gernerell? If what do I have to consider? "... For this implementaton to function, the header file export.hpp has to come after all the archive header files ..." (source: http://www.cs.brown.edu/~jwicks/boost/libs/serialization/doc/special.html) Does that mean that I only have to inlcude all archive header, then export.hpp and then the BOOST_CLASS_EXPORT_GUID can follow? Like that: *** inlcudeMe.h *** #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/archive/binary_iarchive.hpp> #include <boost/serialization/export.hpp> *** GbCircle2D.h *** #include " inlcudeMe.h" ... (declaration of GbCircle2D) BOOST_CLASS_EXPORT_GUID(GbCircle2D,"GbCircle2D") *** GbRectangle2D.h *** #include " inlcudeMe.h" ... (declaration of GbRectangle2D) BOOST_CLASS_EXPORT_GUID(GbRectangle2D," GbRectangle2D ") *** main.cpp *** ... #include "./GbCircle2D.h" #include "./ GbRectangle2D.h" ... int main() { ... } Best regards, SirAnn ______________________________________ iRMB - Institute for Computational Modeling in Civil Engineering TU Braunschweig Pockelsstr. 3 (9th Floor) D-38106, Braunschweig, Germany   phone +49 531/391-7595 fax   +49 531/391-7599 email freud@irmb.tu-bs.de web   www.irmb.tu-bs.de