<tt>Idx = term()</tt></li></ul></p>
</div><p>
  Returns a map with the nodes of the Tree as values and the
  result of applying Fun to them as keys.</p>

<h3 class="function"><a name="is_node_pair-1">is_node_pair/1</a></h3>
<div class="spec">
<p><tt>is_node_pair(Node::<a href="tree.html#type-tree_node">tree:tree_node()</a>) -&gt; boolean()</tt><br></p>
</div><p>
  Returns whether a node is a node pair</p>

<h3 class="function"><a name="new-0">new/0</a></h3>
<div class="spec">
<p><tt>new() -&gt; <a href="#ty