s"><em>coroutine-function</em></span>
        the state of the coroutine can be checked via <span class="emphasis"><em>asymmetric_coroutine&lt;&gt;::pull_type::operator
        bool</em></span> returning <code class="computeroutput"><span class="keyword">true</span></code>
        if the coroutine is still valid (<span class="emphasis"><em>coroutine-function</em></span>
        has not terminated). Unless the first template parameter is <code class="computeroutput"><span class="keyword">void</span></code>, 