Hi! Lets assume I have some kind of map : map<int, boost::asio::ip::tcp::acceptor> my_acceptors; AND map<int, boost::asio::ip::tcp::socket> my_sockets; I want to extend the maps with new objects, so what is the right way to (?): my_acceptors[someport_int].initialize(_my_ioservice,_my_endpoint); my_acceptors[another_int].initialize(_my_ioservice); I use such code, but not sure it is right: { // initialize new acceptor ip::tcp::endpoint _my_endpoint(ip::tcp::v4(),port); ip::tcp::acceptor _acc(_my_ioservice,_my_endpoint); my_acceptors[someport_int] = _acc; // initialize new socket ip::tcp::socket _thesock(_my_ioservice); my_sockets[another_int] = _thesock; // asycc_accept my_acceptors[someport_int].async_accept(my_sockets[new_neighbour_id],boost::bind(do_AsyncAcceptHandler,this,new_neighbour_id)); } Thanks!