n> <span class="n">Template</span><span class="o">&lt;</span><span class="k">decltype</span><span class="p">(</span><span class="n">xs</span><span class="p">)...</span><span class="o">&gt;</span><span class="p">(</span><span class="n">xs</span><span class="p">...));</span>
<span class="n">assert</span><span class="p">(</span><span class="n">construct_meta</span><span class="o">&lt;</span><span class="n">MetafunctionClass</span><span class="o">&gt;</span><span class="p">()(</span><span class="n">xs</span><sp