class</a> <span class="special">&amp;&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="imported_class.html#idp40165760-bb">private member functions</a></span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span><span class="special">...</span> Args<span class="special">&gt;</span> 
    <span class="emphasis"><em>