trie::node_iterator Interface

# ``trie`::node_iterator` Interface

Node iterator.

This is an "iterator to an iterator" - it iterates over nodes, and de-referencing it returns one of the tree's iterators

## Base Classes

Class | Derivation Type
    trie::const_node_iterator
| public

## Public Types and Constants

### General Container Definitions

Type | Definition | Description
    size_type
    typename trie::const_node_iterator::size_type
| Size type.

### Value-Type Definitions

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.

## Public Methods

### Constructors, Destructor, and Related

Method | Description
    inline
      pat_trie_node_it_
      ()
| Default constructor.

### Access Methods

Method | Description
    inline reference
      operator*
      () const
| Access; returns the iterator associated with the current leaf. Should be called only for leaf nodes.

### Movement Methods

Method | Description
    node_iterator
      get_child
      (size_type i) const
| Returns a node iterator to the corresponding node's `i`-th child.