rCompare<span class="special">&gt;</span> 
  <span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span> <span class="identifier">node_ptr</span><span class="special">,</span> <span class="keyword">bool</span> <span class="special">&gt;</span> 
  <a name="idp72506176-bb"></a><span class="identifier">insert_unique_check</span><span class="special">(</span><span class="keyword">const</span> <span cl