onstruct/copy/destruct</a></span>
  <span class="keyword">explicit</span> <a class="link" href="attribute_terminal.html#idp33832464-bb"><span class="identifier">attribute_terminal</span></a><span class="special">(</span><span class="identifier">attribute_name</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> U<spa