   Constructs an object <code class="computeroutput">result</code> of type <code class="computeroutput">async_result&lt;Handler&gt;</code>,
              initializing the object as <code class="computeroutput">result(handler)</code>.
            </li>
<li class="listitem">
              Obtains the handler's associated executor object <code class="computeroutput">ex</code> by
              performing <code class="computeroutput">get_associated_executor(handler)</code>.
            </li>
<li class="listitem"