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;
	}
};