class="keyword">bool</span> <span class="special">&gt;</span> 
    <a class="link" href="avltree_algorithms.html#idp57099968-bb"><span class="identifier">insert_unique_check</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="keyword">const</span> <span class="identifier">node_ptr</span> <span class="special">&amp;</span><span class="special">,</span> 
         