ass="special">(</span><span class="identifier">node_ptr</span> header1<span class="special">,</span> <span class="identifier">node_ptr</span> header2<span class="special">)</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Requires</strong></span>: header1 and header2 must be the header nodes of two trees.</p>
<p><span class="bold"><strong>Effects</strong></span>: Swaps two trees. After the function header1 will contain links to the second tree and header2 will have links to the first