ssion</td><td>The containing <a class="el" href="classipc_1_1session_1_1Session__base.html" title="Internal type containing data and types common to internal types Server_session_impl and Client_sessi...">Session_base</a>. </td></tr>
    <tr><td class="paramname">async_worker</td><td>The thread W of the containing <code>*_session_impl</code>. <code>GracefulSessionEnd</code> handler is at least partially invoked there (<code>hose(...)</code>); and <a class="el" href="classipc_1_1session_1_1Session__base_1_1G