CheckedPtr.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 "CheckedPtr.h"
- #include <iostream>
- using std::cerr;
- #include <stdexcept>
- using std::out_of_range;
- int& CheckedPtr::operator*()
- {
- if (curr == end)
- throw out_of_range("dereference past the end");
- return *curr;
- }
- const int& CheckedPtr::operator*() const
- {
- if (curr == end)
- throw out_of_range("dereference past the end");
- return *curr;
- }
- // postfix: increment/decrement object but return unchanged value
- CheckedPtr CheckedPtr::operator++(int)
- {
- // no check needed here, the call to prefix increment will do the check
- CheckedPtr ret(*this); // save current value
- ++*this; // advance one element, checking the increment
- return ret; // return saved state
- }
- CheckedPtr CheckedPtr::operator--(int)
- {
- // no check needed here, the call to prefix decrement will do the check
- CheckedPtr ret(*this); // save current value
- --*this; // move backward one element and check
- return ret; // return saved state
- }
- // prefix: return reference to incremented/decremented object
- CheckedPtr& CheckedPtr::operator++()
- {
- if (curr == end)
- throw out_of_range
- ("increment past the end of CheckedPtr");
- ++curr; // advance current state
- return *this;
- }
- CheckedPtr& CheckedPtr::operator--()
- {
- if (curr == beg)
- throw out_of_range
- ("decrement past the beginning of CheckedPtr");
- --curr; // move current state back one element
- return *this;
- }