n class="identifier">t</span><span class="special">);</span>
    <span class="special">};</span>

    <span class="comment">// Input is the same type used as the first template parameter passed</span>
    <span class="comment">// while instantiating the multi_pass</span>
    <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Input</span><span class="special">&gt;</span>
    <span class="keyword">struct</span> <span class="ide