I'd try to avoid weak references if at all possible.

Some remarks:

• Calling DESTROY on an object to force it to destruct doesn't work at all as far as I know, but someone else might know more than I do.
• I would suggest you take a look at Graph::Directed. It keeps the graph as a seperated object from the nodes and edges, which should remove the need for references in the nodes and edges themselves.
• You can also try writing your own graph object that removes the references in the nodes/edges when it goes out of scope. That way you also don't need weak references.

HTH,
Joost

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