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EXAMPLE 13.8 An Iterator Class Template for the Li s t Class Template #include 7Ast.h" #include "1terator.h" template<class T> class ListIter : public Iterator<T> { public: ListIter(ListcTS 1) : list(l) { reset(); > virtual void reset0 { previous = NULL; current = list.first; > virtual T operator0 () { return current->data; > virtual void operator=(T t) { current->data = t; > virtual int operator!(); // determine whether current exists // advance iterator to next item virtual int operator++(); void insert(T t); // insert t after current item void preInsert(T t); // insert t before current item void remove(); // remove current item protected: ListNodecT>* current; // points to current node ListNode<T>* previous; // points to previous node List<T>& list; // this is the list being traversed >;
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In addition to a constructor and the five fundamental operations, we have added three other functions that will make lists much more useful. They allow the insertion and deletion of items anywhere in the list. The operator! ( ) function serves two purposes. First it resets the current pointer if necessary, and then it reports back whether that pointer is NULL. The first purpose is to clean up after a call to the remove ( ) function which deletes the node to which current points.
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templatecclass T> int ListIter<T>::operator! () { if (current == NULL) // reset current pointer if (previous == NULL) current = list.first; else current = previous->next; return (current != NULL); // returns TRUE if current exists
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If the current and previous pointers are both NULL, then either the list is empty or it has only one item. So setting current equal to the list s first pointer will either make current NULL or leave it pointing to the first item in the list. If current is NULL but previous is pointing to a node, then we simply reset current to point to the item that follows that node. Finally, the function returns 0 or 1 according to whether current is NULL. This allows the function to be invoked in the form
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where i t is an iterator. The expression ( ! i t ) is read a current item exists, because the function will return 1 (i.e., true ) if current is not NULL. We use this function to check the status of the current pointer before invoking an insertion or deletion function that requires using the pointer.
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The operator++0 increments the iterator by advancing its current pointer to the next item in the list after advancing its previous pointer. It precedes this action with the same resetting procedure that the operator ! ( ) function performed if it finds the current pointer NULL:
template<class T>
int ListIter<Tx:operator++()
// reset current pointer if (current == NULL) == NULL) current = list.first; if (previous else current = previous->next; // advance current pointer else { previous = current; current = current->next; return (current != NULL); // returns TRUE if current exists
This operator allows for easy traversal of the list:
for (it.reset(); !it; it++) . . .
just like an ordinary for loop traversing an array. It resets the iterator to locate the first item in the list. Then after visiting that item, it increments the iterator to advance and visit the next item. The loop continues as long as ! it returns true , which means that there is still an item to be visited. The ins er t ( t > function creates a new node for t and then inserts that node immediately after the current node:
template<class T> void ListIter<T>::insert(T t) { ListNode<T>* p = list.newNode(t,O); if (list.isEmpty()) list-first = p; else { p->next = current->next; current->next = p;
The insert operation can be visualized like this:
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