Node iterator.
This is an
| Class | Derivation Type | 
| const_node_iterator | public | 
| Method | Description | Complexity Guarantee | Exception Guarantee | 
| inline node_iterator (const node_pointer p_nd = NULL) | Default constructor. | O(1) worst. | 3 | 
| Method | Description | Complexity Guarantee | Exception Guarantee | 
| inline iterator operator* () const | Access. | O(1) worst. | 3 | 
| Method | Description | Complexity Guarantee | Exception Guarantee | 
| inline node_iterator l_child () | Returns the node iterator associated with the left node. | O(1) worst. | 3 | 
| inline node_iterator r_child () | Returns the node iterator associated with the right node. | O(1) worst. | 3 |