48         struct iterator  struct
50             typedef std::bidirectional_iterator_tag iterator_category;
51             typedef ArrayBinaryTreeNode value_type;
52             typedef size_type difference_type;
53             typedef array_binary_tree_node* pointer;
54             typedef ArrayBinaryTreeNode& reference;
56             inline iterator() : i(0), n(0) {}  in iterator()  argument
57             inline iterator(const iterator& x)  in iterator()  argument
61             inline iterator& operator=(const iterator& x)  in operator =()
70             inline iterator(  in iterator()  function
75             inline array_binary_tree_node operator*()  in operator *()
79             inline iterator& operator++()  in operator ++()
84             inline iterator operator++(int)  in operator ++()
90             inline iterator& operator--()  in operator --()
95             inline iterator operator--(int)  in operator --()
101             inline bool operator==(const iterator& x) const { return i == x.i; }  in operator ==()
102             inline bool operator!=(const iterator& x) const  in operator !=()
106             rep_iterator r;
107             size_type i;
108             size_type n;
109             ID id;