 are inserted or erased from the set. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="keyword">void</span> <a name="idp57113536-bb"></a><span class="identifier">insert_unique_commit</span><span class="special">(</span><span class="identifier">node_ptr</span> header<span class="special">,</span> <span class="identifier">node_ptr</span> new_value<span class="special">,</span> 
                                 <span class="keyword">const</span> <span