ntifier">swap_nodes</span></a><span class="special">(</span><a class="link" href="unordered_set_base_hook.html" title="Class template unordered_set_base_hook">unordered_set_base_hook</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="unordered_set_base_hook.html#idp65830368-bb"><span class="identifier">is_linked</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword"