Hi all, Boost:1.38.0 compiler:gcc4.1.1 I am trying to serialize and deserialize a pointer to the class, but ended with the segmentation fault, Is that the null pointer serialization gives the segmentation fault?. I read in document that, library will maintain the Null pointer. if not how can i serialize? ,any docs or related refference is a;so acceptable. Thanks in advance.... one more thing: what -1 in archive(text_archive) indicates? Example ------------ #include <fstream> #include "boost/archive/text_iarchive.hpp" #include "boost/archive/text_oarchive.hpp" #include "boost/serialization/access.hpp" #include "boost/serialization/assume_abstract.hpp" class Dkpt { public: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int file_version) { (void) file_version; ar & data_; ar & b_i; ar & f_er; ar & pa_er; ar & ct_c; } private: uint8_t data_; bool b_i; bool f_er; bool pa_er; bool ct_c; }; ---- class RB : public RM { public: virtual void checkpoint_save(boost::archive::text_oarchive & oa) { oa & dr; } virtual void checkpoint_retrive(boost::archive::text_iarchive & ia) { ia & dr; } private: Dkpt* dr; ;} Thanks. Niranjan