"is_unit_of_sy_idp109487840.html" title="Struct template is_unit_of_system&lt;unit&lt; Dim, System &gt;, System&gt;">is_unit_of_system</a><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="special">,</span> <span class="identifier">System</span><span class="special">&gt;</span> <span class="special">{</span>