 
  <a name="idp57099968-bb"></a><span class="identifier">insert_unique_check</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">const_node_ptr</span> <span class="special">&amp;</span> header<span class="special">,</span> <span class="keyword">const</span> <span class="identifier">node_ptr</span> <span class="special">&amp;</span> hint<span class="special">,</span> 
                      <span class="keyword">const</span> <span class="identifier">KeyType</span> 