72 bool save(
const std::string& out_fname)
const;
75 bool do_save(std::ostream& os)
const;
76 void do_load(std::istream& is);
106 bool save(
const std::string& out_fname)
const ;
108 bool do_save(std::ostream& os)
const;
109 void do_load(std::istream& is);