</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Dim<span class="special">,</span> <span class="keyword">typename</span> System<span class="special">,</span> <span class="keyword">typename</span> Enable<span class="special">&gt;</span> 
<span class="keyword">class</span> <a class="link" href="unit.html" title="Class template unit">unit</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span