<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_homogeneous_system</span><span class="special">&lt;</span> <span class="identifier">homogeneous_system</span><span class="special">&lt;</span><span class="identifier">S</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
<span class="keyword">template</