>
        <span class="comment">// The method is expected to return true if the destructed </span>
        <span class="comment">// instance is the last copy of a particular multi_pass. </span>
        <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">MultiPass</span><span class="special">&gt;</span>
        <span class="keyword">static</span> <span class="keyword">bool</span> <span class="identifier">release</span><span cla