ension similar to boost::asio::async_write(Peer_socket&amp;, Blob_const,...">async_write_with_native_handle()</a> in that case.)</li>
<li>If non-null <code>err_code</code>, then <code>N == 0</code> is returned; and <code>*err_code == E</code> is set to the triggering problem. If null, then <code>flow::error::Runtime_error</code> is thrown containing <code>Error_code E</code>.<ul>
<li><code>E == boost::asio::error::would_block</code> specifically indicates the non-fatal condition wherein <code>*peer_socket</