// Typedef the node that linked_hash will be using internally.
typedef _linked_hash_node<Key, Data, HashFcn, EqualKey, Alloc> _Node;

// Typedef an allocator for allocating new nodes.
typedef typename Alloc::rebind<_Node>::other _Node_Alloc;

// Typedef an allocator for allocating node pointers.  This will be used in 
// the internal hash_map and list.
typedef typename Alloc::rebind<typename 
                                _Node_Alloc::pointer>::other _NodeP_Alloc;
// Typedefs for the internal hash_map and list	 
typedef hash_map<Key, typename _Node_Alloc::pointer, HashFcn, 
	 	               EqualKey, _NodeP_Alloc> _Hash_Map;
typedef list<_Node*, _NodeP_Alloc> _List;

Example 1: Typedefs of internal template classes.