c++ - Set timeout for boost socket.connect -

i using boost::asio::connect on tcp::socket. when goes fine, connect returns on poor network, connect times out after log wait of 15 seconds. cannot afford wait long , want reduce timeout. unfortunately have not come across solution far.

i see solutions async_wait been used deadline_timer examples receive / send operations , not connect.

can me sample code boost::asio::connect(socket, endpoints);. requirement should timeout in 5 seconds instead of 15.

have take following example? contains sample code async_connect timeout.

http://www.boost.org/doc/libs/1_52_0/doc/html/boost_asio/example/timeouts/blocking_tcp_client.cpp

the connect timeout method implemented using following code:

void connect(const std::string& host, const std::string& service,   boost::posix_time::time_duration timeout)  { // resolve host name , service list of endpoints. tcp::resolver::query query(host, service); tcp::resolver::iterator iter = tcp::resolver(io_service_).resolve(query);  // set deadline asynchronous operation. host name may // resolve multiple endpoints, function uses composed operation // async_connect. deadline applies entire operation, rather // individual connection attempts. deadline_.expires_from_now(timeout);  // set variable receives result of asynchronous // operation. error code set would_block signal // operation incomplete. asio guarantees asynchronous // operations never fail would_block, other value in // ec indicates completion. boost::system::error_code ec = boost::asio::error::would_block;  // start asynchronous operation itself. boost::lambda function // object used callback , update ec variable when // operation completes. blocking_udp_client.cpp example shows how // can use boost::bind rather boost::lambda. boost::asio::async_connect(socket_, iter, var(ec) = _1);  // block until asynchronous operation has completed. io_service_.run_one(); while (ec == boost::asio::error::would_block);  // determine whether connection established. // deadline actor may have had chance run , close our socket, // though connect operation notionally succeeded. therefore must // check whether socket still open before deciding if succeeded // or failed. if (ec || !socket_.is_open())   throw boost::system::system_error(       ec ? ec : boost::asio::error::operation_aborted); }