[Boost-users] asio:how to using iostream in blocking mode

Hi all： In asio iostream client example: 27 tcp::iostream s(argv[1], "7777"); 28 std::string line; 29 std::getline(s, line); 30 std::cout << line << std::endl; Can I using iostream s in blocking mode? Which means std::getline will blocking to wait for data coming? Best wishes, maosen