NB4L1

template <class T>class Tree{	T *_value;	Tree<T> *_left;	Tree<T> *_right;	Tree<T> *_root;		Tree(T *value);	Tree(const Tree<T>&);	Tree& operator=(const Tree&);public:	Tree();	~Tree();	T& getValue();	int getDepth();	template <class t> friend ostream& operator<<(ostream&, const Tree<t>&);	Tree& operator+=(T*);		class TreeIterator	{		Tree<T> *_prev;		Tree<T> *_next;	public:		TreeIterator(Tree<T> *tree);		bool hasNext();		T& next();	};	TreeIterator& getIterator()	{		TreeIterator *ti = new TreeIterator(this);		return *ti;	}};