r</span> h<span class="special">,</span> <span class="identifier">node_ptr</span> new_node<span class="special">,</span> <span class="identifier">NodePtrCompare</span> comp<span class="special">)</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Requires</strong></span>: "h" must be the header node of a tree. NodePtrCompare is a function object that induces a strict weak ordering compatible with the strict weak ordering used to create the the tree. NodePtrCompare compares two node_ptr