tml#a26d038e14e3c0e461e76de88c4ce76c5" title="The (internally used) session master channel is a transport::struc::Channel of this concrete type.">Master_structured_channel</a> is up, and the send op doesn't return failure).</li>
<li>Perform <code>m_opposing_session_done.get_future().wait()</code>, where <code>m_opposing_session_done</code> is a <code>promise&lt;void&gt;</code> that shall be fulfilled on these events (and only if it hasn't already been fulfilled before):<ul>
<li>The <a class="el" href="class