Node iterator.
This is an "iterator to an iterator" - it iterates over nodes, and de-referencing it returns one of the tree's iterators
| Class | Derivation Type | 
| trie::const_node_iterator | public | 
| Type | Definition | Description | 
| size_type | typename trie::const_node_iterator::size_type | Size type. | 
| Type | Definition | Description | 
| value_type | container_base::iterator | Iterator's value type. | 
| reference | value_type | Iterator's reference type. | 
| const_reference | value_type | Iterator's const reference type. | 
| Method | Description | 
| inline pat_trie_node_it_ () | Default constructor. | 
| Method | Description | 
| inline reference operator* () const | Access; returns the iterator associated with the current leaf. Should be called only for leaf nodes. | 
| Method | Description | 
| node_iterator get_child (size_type i) const | Returns a node iterator to the corresponding node's i-th child. |