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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);
          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.
        
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.
An iterator denoting the successfully connected endpoint.
                Thrown on failure. If the sequence is empty, the associated error_code
                is boost::asio::error::not_found. Otherwise, contains
                the error from the last connection attempt.
              
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::asio::connect(s, e.begin(), e.end());