span> Dim<span class="special">,</span> <span class="keyword">typename</span> System<span class="special">,</span> <span class="keyword">long</span> N<span class="special">,</span> <span class="keyword">long</span> D<span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="root_typeof_h_idp109881840.html" title="Struct template root_typeof_helper&lt;unit&lt; Dim, System &gt;, static_rational&lt; N, D &gt;&gt;">root_typeof_helper</a><span class="special">&lt;</span><span cl