span> <span class="identifier">all</span> <span class="special">=</span> <span class="identifier">make_inverse</span><span class="special">&lt;</span><span class="identifier">box</span><span class="special">&gt;();</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">dsv</span><span class="special">(</span><span class="identifier">all</span><span class="special">)</span> <span class="s