ct datatype</b>: <tt>tree_node()</tt></p>


<h3 class="typedecl"><a name="type-tree_ph">tree_ph()</a></h3>
<p><b>abstract datatype</b>: <tt>tree_ph()</tt></p>


<h2><a name="index">Function Index</a></h2>
<table width="100%" border="1" cellspacing="0" cellpadding="2" summary="function index"><tr><td valign="top"><a href="#breadth_fold-3">breadth_fold/3</a></td><td>
  Folds a function through a tree in breadth first order.</td></tr>
<tr><td valign="top"><a href="#collapse_node-2">collapse_node/2</a></td><td>