std::map<int, std::string >::iterator it_lv_nb = lvlist.begin();
std::map<int, std::string >::iterator it_lv = lvlist.begin();
it_lv_nb++;
std::map<int, std::string >::iterator it_lv_nb = lvlist.begin();
std::map<int, std::string >::iterator it_lv = lvlist.begin();
it_lv_nb++;