ine">qi</span>
          engine. Here's how we do it:
        </p>
<p>
          First, we enable the prefix star operator. In proto, it's called the "dereference":
        </p>
<p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;&gt;</span>
<span class="keyword">struct</span> <span class="identifier">use_operator</span><span class="special">&lt;</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">domain</span><span