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Asynchronously establishes a socket connection by trying each endpoint in a sequence.
template<
typename Protocol,
typename Iterator,
typename IteratorConnectHandler>
DEDUCED async_connect(
basic_socket< Protocol > & s,
Iterator begin,
Iterator end,
IteratorConnectHandler && handler);
This function attempts to connect a socket to one of a sequence of endpoints.
It does this by repeated calls to the socket's async_connect
member function, once for each endpoint in the sequence, until a connection
is successfully established.
The socket to be connected. If the socket is already open, it will be closed.
An iterator pointing to the start of a sequence of endpoints.
An iterator pointing to the end of a sequence of endpoints.
The handler to be called when the connect operation completes. Copies will be made of the handler as required. The function signature of the handler must be:
void handler( // Result of operation. if the sequence is empty, set to // boost::asio::error::not_found. Otherwise, contains the // error from the last connection attempt. const boost::system::error_code& error, // On success, an iterator denoting the successfully // connected endpoint. Otherwise, the end iterator. Iterator iterator );
Regardless of whether the asynchronous operation completes immediately
or not, the handler will not be invoked from within this function.
Invocation of the handler will be performed in a manner equivalent
to using boost::asio::io_context::post().
std::vector<tcp::endpoint> endpoints = ...;
tcp::socket s(io_context);
boost::asio::async_connect(s,
endpoints.begin(), endpoints.end(),
connect_handler);
// ...
void connect_handler(
const boost::system::error_code& ec,
std::vector<tcp::endpoint>::iterator i)
{
// ...
}