Hello,<br><br>Avl_node_base::remove function removes itself from the Avl_tree and leaves the _parent and _child[] variables as they are.<br>Since someone could try to remove the same Avl_node_base twice by mistake, it results in the crash of Avl_tree datastructure.<br>
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.<br><br>Best regards,<br>Jaeyong<br>