connect (6 of 12 overloads)

Establishes a socket connection by trying each endpoint in a sequence.

template<
    typename Protocol,
    typename Iterator>
Iterator connect(
    basic_socket< Protocol > & s,
    Iterator begin,
    Iterator end,
    boost::system::error_code & ec);

This function attempts to connect a socket to one of a sequence of endpoints. It does this by repeated calls to the socket's connect member function, once for each endpoint in the sequence, until a connection is successfully established.

Parameters

s: The socket to be connected. If the socket is already open, it will be closed.
begin: An iterator pointing to the start of a sequence of endpoints.
end: An iterator pointing to the end of a sequence of endpoints.
ec: Set to indicate what error occurred, if any. If the sequence is empty, set to boost::asio::error::not_found. Otherwise, contains the error from the last connection attempt.

Return Value

On success, an iterator denoting the successfully connected endpoint. Otherwise, the end iterator.

Example

tcp::resolver r(io_context);
tcp::resolver::query q("host", "service");
tcp::resolver::results_type e = r.resolve(q);
tcp::socket s(io_context);
boost::system::error_code ec;
boost::asio::connect(s, e.begin(), e.end(), ec);
if (ec)
{
  // An error occurred.
}