pe</span><span class="special">,</span> <span class="identifier">qi</span><span class="special">::</span><span class="identifier">unused_type</span><span class="special">)</span> <span class="keyword">const</span>
        <span class="special">{</span>
            <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">i</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span