For use with CMSC-341, Spring 99,  Project 2

Here is the definition of the ListIterator class. 

Copy it to your ListIterator.H file. 

Remember:
 -- implement the inline method(s)
 -- guard the file
 -- complete the documentation
------------------------------------------------

/* Iterators over Lists.  Forward and reverse
   iterators can be chosen by argument to the constructor.
   This is an abstract class -- it does not implement the
   Next() method of Iterator, its superclass.
   Author: Thomas Anastasio
   Version: 28 February 1999
*/
template <class T>
class ListIterator : public Iterator<T>
{
private:
  List<T> * _list;  // the list iterated over
  int _current;     // current position
protected:
  inline void SetCurrent(int cur);  // mutator for _current
  inline void SetList(List<T> *);  // mutator for _list
  inline List<T> * GetList();      // accessor for _list

  // Constructor for iterator
  // Param: lst the list over which to iterate.
  // Param: direction the direction in which to iterate
  //      (FORWARD or REVERSE  see IteratorConstants.H)
  // Defaults to FORWARD unless REVERSE is chosen
  ListIterator(List<T>* lst, int direction);

public:
  // Accessor for the current position
  // Return: the current position
  inline int GetCurrent();

  bool HasNext();
};