(obj)</span>
<a name="l00219"></a>00219 <span class="comment">// returns a reference to Unit&lt;T&gt;, where Unit is the template used to generate H</span>
<a name="l00220"></a>00220 <span class="comment">//     and T is the i-th type in the typelist </span>
<a name="l00222"></a>00222 <span class="comment"></span>
<a name="l00223"></a>00223     <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> i, <span class="keyword">class</span> H&gt;
<a name="l00224"></a>00224     <span class