           A basic_socket is always the lowest layer.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../basic_raw_socket/message_flags.html" title="basic_raw_socket::message_flags"><span class="bold"><strong>message_flags</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Bitmask type for flags that can be passed to send and receive
                    operations.
      