html">00270</a>     <span class="keyword">class </span>GenLinearHierarchy&lt;Typelist&lt;T, NullType&gt;, Unit, Root&gt;
<a name="l00271"></a>00271         : <span class="keyword">public</span> Unit&lt;T, Root&gt;
<a name="l00272"></a>00272     {
<a name="l00273"></a>00273     };
<a name="l00274"></a>00274 
<a name="l00275"></a>00275     <span class="keyword">template</span>
<a name="l00276"></a>00276     &lt;
<a name="l00277"></a>00277         <span class="keyword">template</span> &lt;<span class="keyword"