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After the data in the top node is saved in the variable result, the pointer top is moved to the next node in the linked list, effectively removing the top node from the list The pointer top is moved with the statement
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top = top->getLink( );
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However, before the pointer top is moved, a temporary pointer, called discard, is positioned so that it points to the node that is about to be removed from the list The storage for the removed node can then be recycled with the following call to delete:
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Each node that is removed from the linked list by the member function pop has its memory recycled with a call to delete, so all that the destructor needs to do is remove each item from the stack with a call to pop Each node will then have its memory returned to the freestore for recycling
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11 Give the definition of the member function push of the template class Stack described in Displays 1713 and 1715 12 Give the definition of the copy constructor for the template class Stack described in Displays 1713 and 1715 13 Give the definition of the overloaded assignment operator for the template class Stack described in Displays 1713 and 1715
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A stack is a last-in/first-out data structure Another common data structure is a queue, which handles data in a first-in/first-out fashion A queue can be implemented with a linked list in a manner similar to our implementation of the Stack template class However, a queue needs a pointer at both the head of the list and at the end of the linked list, since action takes place in both locations It is easier to remove a node from the head of a linked list than from the other end of the linked list Therefore, our implementation will remove nodes from the head of the list (which we will now call the front of the list) and will add nodes to the other end of the list, which we will now call the back of the list (or the back of the queue) The definition of the Queue template class is given in Display 1716 A sample application that uses the class Queue is shown in Display 1717 The definitions of the member functions are left as SelfTest Exercises (but remember that the answers are given at the end of the chapter should you have any problems filling in the details)
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A queue is a first-in/first-out data structure; that is, the data items are removed from the queue in the same order that they were added to the queue
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 //This is the header file queueh This is the interface for the class //Queue, which is a template class for a queue of items of type T #ifndef QUEUE_H #define QUEUE_H This is the same definition of the template class Node
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that we gave for the stack interface in Display 1713 See namespace QueueSavitch the tip A Comment on Namespaces for a discussion of { this duplication template<class T> class Node { public: Node(T theData, Node<T>* theLink) : data(theData), link(theLink){} Node<T>* getLink( ) const { return link; } const T getData( ) const { return data; } void setData(const T& theData) { data = theData; } void setLink(Node<T>* pointer) { link = pointer; } private: T data;
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19 20 Node<T> *link; };
You might prefer to replace the parameter type T with const T&
21 22 23 24 25 26 template<class T> class Queue { public: Queue( ); //Initializes the object to an empty queue