uantity</span><span class="special">&lt;</span><span class="identifier">unit</span><span class="special">&lt;</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">&gt;,</span><span class="identifier">Y</span><span class="special">&gt;,</span><span class="identifier">System</span> <span class="special">&gt;;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="