Code Fragment: AVLItem

template <typename Key, typename Element>
class AVLItem : public Item<Key,Element> {		// an AVL item
private:
  int hgt;						// node height
public:
  AVLItem(const Key& k = Key(), const Element& e = Element(), int h = 0)
  	: Item<Key, Element>(k, e), hgt(h) { }
  int height() const { return hgt; }			// get height
  void setHeight(int h) { hgt = h; }			// set height
};