V</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">DT</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">get_system_tag_of_dim</span><span class="special">&lt;</span><span class="identifier">S</span><span cla