reverse-iter.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 "algs_preamble.h"
- int main()
- {
- vector<int> vec;
- istream_iterator<int> in(cin), eof;
- copy (in, eof, back_inserter(vec));
- // sorts vec in ``normal'' order
- sort(vec.begin(), vec.end());
- vector<int> vec2(vec);
- // sorts in reverse: puts smallest element at the end of vec
- sort(vec.rbegin(), vec.rend());
- ostream_iterator<int> out(cout, " ");
- copy(vec.begin(), vec.end(), out); // reverse sort
- cout << endl;
- copy(vec2.begin(), vec2.end(), out); // forward sort
- cout << endl;
- // it refers to the first element in vec
- vector<int>::iterator it = vec.begin();
- // rev_it refers one before the first element in vec
- vector<int>::reverse_iterator rev_it(it);
- cout << *(rev_it.base()) << endl; // prints first element in vec
- // ways to print value at beginning of vec through it and rev_it
- cout << *it << endl;
- cout << *(rev_it.base()) << endl;
- cout << *(rev_it - 1) << endl;
- return 0;
- }