ze()</code>; or there is a truthy <code>Error_code</code>, and <code>N</code> will be strictly less than <code>payload_blob.size()</code>. </td></tr>
    <tr><td class="paramname">on_sent_or_error</td><td>Handler to execute at most once on completion of the async op. It is executed as if via <code>post(peer_socket-&gt;get_executor())</code>, fully respecting any executor bound to it (via <code>bind_executor()</code>, such as a strand). It shall be passed <code>Error_code</code>. The semantics of these value