ead</span></code> overloads should adjust
                the usage of the returned value as needed.
              </li></ul></div>
        </li>
<li class="listitem">
          Metafunctions <code class="computeroutput"><span class="identifier">has_get_executor</span></code>,
          <code class="computeroutput"><span class="identifier">is_sync_stream</span></code>, <code class="computeroutput"><span class="identifier">is_sync_read_stream</span></code>, <code class="computeroutput"><span class="identifie