Smart pointers for modelling a general tree structure & its iterators?

Shared_ptr is total overkill: it's a tree so there is no shared ownership of nodes. Each node has a single owner: its parent.

For parent pointer: You have to ensure it always points to the actual parent in the setters for the children in parent, so adding an unset to the Treenode destructor is comparably simple. In which case dumb pointer will do.

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