Code Fragment: Position

  class Position {	                      		// a hash table position
  private:
    EntryPtr node;					// pointer to entry
  public:
    Position(EntryPtr n = NULL)				// constructor
      { node = n; }
    Element& element()  				// get element
      { return node->element(); }
    const Key& key() const 				// get key
      { return node->key(); }
    bool isNull() const 				// a null position?
      { return node == NULL; }
    friend LinearProbeHashTable;			// give hash table access
  };