Queue.h
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上传日期:2022-06-29
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Visual C++
- /*
- * This file contains code from "C++ Primer, Fourth Edition", by Stanley B.
- * Lippman, Jose Lajoie, and Barbara E. Moo, and is covered under the
- * copyright and warranty notices given in that book:
- *
- * "Copyright (c) 2005 by Objectwrite, Inc., Jose Lajoie, and Barbara E. Moo."
- *
- *
- * "The authors and publisher have taken care in the preparation of this book,
- * but make no expressed or implied warranty of any kind and assume no
- * responsibility for errors or omissions. No liability is assumed for
- * incidental or consequential damages in connection with or arising out of the
- * use of the information or programs contained herein."
- *
- * Permission is granted for this code to be used for educational purposes in
- * association with the book, given proper citation if and when posted or
- * reproduced.Any commercial use of this code requires the explicit written
- * permission of the publisher, Addison-Wesley Professional, a division of
- * Pearson Education, Inc. Send your request for permission, stating clearly
- * what code you would like to use, and in what specific way, to the following
- * address:
- *
- * Pearson Education, Inc.
- * Rights and Contracts Department
- * 75 Arlington Street, Suite 300
- * Boston, MA 02216
- * Fax: (617) 848-7047
- */
- #ifndef QUEUE_H
- #define QUEUE_H
- //NB: if change the interface in this file, also update Queue_interface.h!!!!
- // and int-Queue.h
- #include <iostream>
- // function template declaration must precede friend declaration in Queue
- template <class T> class Queue;
- template <class T>
- std::ostream& operator<<(std::ostream&, const Queue<T>&);
- template <class Type> class Queue {
- friend std::ostream&
- operator<< <Type> (std::ostream&, const Queue<Type>&);
- public:
- Queue(): head(0), tail(0) { }
- // construct a Queue from a pair of iterators on some sequence
- template <class It> Queue(It, It): head(0), tail(0)
- { copy(beg, end); }
- // copy control to manage pointers to QueueItems in the Queue
- Queue(const Queue &Q): head(0), tail(0) {copy(Q);}
- Queue& operator=(const Queue&);
- ~Queue() { destroy(); }
- // replace current Queue by contents delimited by a pair of iterators
- template <class Iter> void assign(Iter, Iter);
- // return element from head of Queue
- // unchecked operation: front on an empty Queue is undefined
- Type& front() { return head->item; }
- const Type front() const { return head->item; }
- void push(const Type &);// add element to back of Queue
- void pop(); // remove element from head of Queue
- bool empty() const { // true if no elements in the Queue
- return head == 0;
- }
- // interface functions to Queue are unchanged
- private:
- // public members are ok: QueueItem is a private member of Queue
- // only Queue and its friends may access the members of QueueItem
- struct QueueItem {
- QueueItem(const Type &);
- Type item; // value stored in this element
- QueueItem *next; // pointer to next element in the Queue
- };
- QueueItem *head; // pointer to first element in Queue
- QueueItem *tail; // pointer to last element in Queue
- // utility functions used by copy constructor, assignment and destructor
- void destroy(); // delete all the elements
- void copy(const Queue&); // copy all elements from parameter
- private:
- // copy all elements from input range denoted by iterator pair
- template <class Iter> void copy(Iter, Iter);
- };
- // Inclusion Compilation Model: include member function definitions as well
- #include "Queue.cc"
- #endif