queue_push_char.cpp
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上传日期:2022-06-29
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书籍源码
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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
- */
- #include "MS_Queue.h"
- #include <stdexcept>
- using std::out_of_range;
- #include <iostream>
- using std::ostream;
- #include <cstring>
- using std::strlen; using std::strncpy;
- void Queue<const char*>::push(const char *const &val)
- {
- // allocate a new character array and copy characters from val
- char* new_item = new char[strlen(val) + 1];
- strncpy(new_item, val, strlen(val) + 1);
- // store pointer to newly allocated and initialized element
- QueueItem<const char*> *pt =
- new QueueItem<const char*>(new_item);
- // put item onto existing queue
- if (empty())
- head = tail = pt; // queue has only one element
- else {
- tail->next = pt; // add new element to end of queue
- tail = pt;
- }
- }
- void Queue<const char*>::pop()
- {
- // remember head so we can delete it
- QueueItem<const char*> *p = head;
- delete head->item; // delete the array allocated in push
- head = head->next; // head now points to next element
- delete p; // delete old head element
- }