xml - boost xml_iarchive crashes when destructors are called -

im having bit of trouble trying figure out why piece of code crash when start function returns 0;

i suspect when returns start function calls destructors xml_iarchive , failing inside there.

do have call flush or function clean before xml_iarchive calls destructors.

i have no idea, :)

    // serialize class filelayout  {  private:      std::string m_name;     int m_datetime;     std::string m_version;      std::string m_clientpath;     int m_length;  public:      filelayout()     {      };      filelayout(std::string name ,int datetime,                  std::string version, std::string clientpath,                  int length)     {         m_name = name;         m_datetime = datetime;         m_version = version;         m_clientpath = clientpath;         m_length = length;     };      // allow serialization access non-public data members.     friend class boost::serialization::access;      template<typename archive>     void serialize(archive& ar, const unsigned version)      {         ar & boost::serialization::make_nvp("name", m_name);         ar & boost::serialization::make_nvp("datetime", m_datetime);         ar & boost::serialization::make_nvp("version", m_version);         ar & boost::serialization::make_nvp("clientpath", m_clientpath);         ar & boost::serialization::make_nvp("length", m_length);     }      //      std::string name()     {         return m_name;     };      int datetime()     {         return m_datetime;     };      std::string version()     {         return m_version;     };      std::string clientpath()     {         return m_clientpath;     };      int length()     {         return m_length;     };  };       int start(std::string &data) // xml      {   // set filesize   // set name   boost::iostreams::basic_array_source<char> device(data.c_str(), data.size());   boost::iostreams::stream<boost::iostreams::basic_array_source<char> > s(device);   boost::archive::xml_iarchive ia(s,boost::archive::no_header);    ia >> boost_serialization_nvp(filelayout);    data.clear();    return 0; // fails here      } 

turns out problem packing, spent whole day on problem