 class="special">,</span> <span class="identifier">proto</span><span class="special">::</span><span class="identifier">tag</span><span class="special">::</span><span class="identifier">dereference</span><span class="special">&gt;</span> <span class="comment">// enables *p</span>
  <span class="special">:</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span> <span class="special">{};</span>
</pre>
<p>
        </p>
<p>
          This is done in namespac