Hello,
Avl_node_base::remove function removes itself from the Avl_tree and leaves
the _parent and _child[] variables as they are.
Since someone could try to remove the same Avl_node_base twice by mistake,
it results in the crash of Avl_tree datastructure.
So, how about setting _parent and _child[] to NULL at Avl_node_base::remove
and, at the entry of the remove function, if someone tries to remove twice,
we could warn him.
Best regards,
Jaeyong
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