</span>: 'node' is a node of the tree or a header node.</p>
<p><span class="bold"><strong>Effects</strong></span>: Returns the header of the tree.</p>
<p><span class="bold"><strong>Complexity</strong></span>: Logarithmic.</p>
<p><span class="bold"><strong>Throws</strong></span>: Nothing. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">node_ptr</span> <a name="idp56847760-bb"></a><span class="identifier">begin_node</span><span class="sp