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This has to be done in a loop that traverses the list. Each node is deleted by invoking the de 1 et e operator on a pointer to the node. The insert ( ) function creates a new node containing the T value t and then inserts this new node at the beginning of the list:
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template<class T> void List<T>::insert(T t) { ListNode<T>* p = newNode(t,first); first = p;
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Since the new node will be made the first node in the list, its next pointer should point to the node that is currently first in the list. Passing the first pointer to the NewNode constructor does that. Then the f irs t pointer is reset to point to the new node. The remove ( ) function removes the first item from the list, returning its data value by reference in the parameter t. The function s return value is 1 or 0 according to whether the operation succeeded:
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templatecclass T> int List<T>: :remove(T& t) if (isEmpty return 0; t = first->data; ListNode<T>* p = first; first = first->next; delete p; return 1; // flag to signal no removal // data value returned by reference // advance first pointer to remove node // flag to signal successful removal
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The print ( ) function simply traverses the list, printing each node s data
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templatecclass T> void List<T>::print() 1 for (ListNodecT>* p=first; p; p=p->next) tout CC p->data CC ' --> "; tout CC "*\n"; >
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value:
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TEMPLATES AND ITERATORS
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Here is a test driver and a sample run:
#include ciostream.h> #include "List.h' #include '5tring.h" main0 1
List&tring>
friends;
friends.insert("Bowen, Van"); friends.insert('Dixon, Tom"); friends.insert("Mason, Joe"); friends.insert('White, Ann"); friends.print(); String name; friends.remove(name); tout << "Removed: H << name -CC endl; friends.print();
Notice that, since each item is inserted at the beginning of the list, they end up in the opposite order from their insertion. This friends list can be visualized like this:
ListNode<String> Jo)
qJ insert0
List&trim>
-List0 ti $J
data
This shows the situation at the moment that the insert ( ) function has invoked the newNode ( > function which has invoked the Li s tNode ( ) constructor to create a new node for 'I Whi t e , Ann 'I .
CHAP. 131
TEMPLATES AND ITERATORS
13.8 ITERATOR CLASSES
A common activity performed on a container object is the traversal of the object. For example, to traverse a L ist object means to travel through the list, visiting each element. This was done by means of a for loop in both the destructor and the print ( > function in our List class template (Example 13.7). An iterator is an object that has the ability to traverse through a container object. It acts like a pointer, locating one item in the container at a time. All iterators have the same basic functionality, regardless of the type of container to which they are attached. The five fundamental operations are:
initialize the iterator at some initial position in the container; return the data value stored at the current position; change the data value stored at the current position; determine whether there actually is an item at the iterator s current position; advance to the next position in the container.
Since these five operations should be implemented by every iterator, it makes sense to declare an abstract base class with these functions. We actually need an abstract base class template because the container classes will be template instances:
templatecclass T> class Iterator { public: virtual int reset0 =O; // initialize the iterator virtual T operator00 =O; // read current value virtual void operator=(T t) =O; // write current value virtual int operator! () =O; // determine whether item exists virtual int operator++0 =O; // advance to next item 1 ;
Recall that every pure virtual function prototype begins with the keyword virtual and ends with the code ( ) = 0 . The parentheses are required because it is a function, and the initializer = 0 makes it a pure virtual function. Also recall that an abstract base class is any class that contains at least one pure virtual function. (See Section 11.9.) Now we can use this abstract base class template to derive iterator templates for various container classes. The List class template in Example 13.7 had an obvious shortcoming: it allowed insertions and deletions only at the front of the list. A list iterator will solve this problem:
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