ass="keyword">bool</span> <a class="link" href="splaytree_algorithms.html#idp72458160-bb"><span class="identifier">unique</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">const_node_ptr</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">static</span> <span class="keyword">void</span> <a class="link" href="splaytree_algorithms.html#idp72460832-bb"><span class="identifier">unlink</span