I am using the Tree::Nary module in a Perl program of mine in which I recently added a recursive function, recurse_tree.

I am finding that each time I call recurse_tree, an empty node, containing no data, is being added to my N-ary tree.

I need to traverse the children of parent nodes using Tree::Nary->children_foreach. To allow Tree::Nary->children_foreach to take each node in the {children} linked list as input I have had to include within my recurse_tree function the following wrapper function:

   my $call_recurse_tree = sub {
      my $node = shift;
      &recurse_tree($node);
   };

[download]


Which is used used by Tree::Nary->children_foreach as follows:

         # PROCESS CHILDREN LIST: recurse_tree will be called on each 
+child of the input Dir Node
         Tree::Nary->children_foreach($node, $Tree::Nary::TRAVERSE_ALL
+, $call_recurse_tree);

[download]


Empty nodes are being added to my N-ary tree in recurse_tree, even though neither this function nor its helpers calls any Tree::Nary append or prepend function -- yet empty, bogus nodes are somehow getting into my tree, one for each call to recurse_tree.

Has anyone ever had a similar problem with Tree::Nary? Could my workaround "my call_recurse_tree = sub" be the culprit? What really makes this problem maddening is that both recurse_tree and its helpers are receiving the node of the N-ary tree BY VALUE, not BY REFERENCE, so they ought not to be able to change my actual N-ary tree -- they are only working on local copies of this tree.

Thank You,
Amphiaraus

In reply to Tree::Nary -- my program is creating phantom nodes by Amphiaraus

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