between the "insert_check" and "insert_commit" calls. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="keyword">bool</span> <a name="idp57121680-bb"></a><span class="identifier">is_header</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">const_node_ptr</span> <span class="special">&amp;</span> p<span class="special">)</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Requires</str