capacity.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 "seq_preamble.h"
- int main()
- {
- vector<int> ivec;
- // size should be zero; capacity is implementation defined
- cout << "ivec: size: " << ivec.size()
- << " capacity: " << ivec.capacity() << endl;
- // give ivec 24 elements
- for (vector<int>::size_type ix = 0; ix != 24; ++ix)
- ivec.push_back(ix);
- // size should be 24; capacity will be >= 24 and is implementation defined
- cout << "ivec: size: " << ivec.size()
- << " capacity: " << ivec.capacity() << endl;
- ivec.reserve(50); // sets capacity to at least 50; might be more
- // size should be 24; capacity will be >= 50 and is implementation defined
- cout << "ivec: size: " << ivec.size()
- << " capacity: " << ivec.capacity() << endl;
- // add elements to use up the excess capacity
- while (ivec.size() != ivec.capacity())
- ivec.push_back(0);
- // size should be 50; capacity should be unchanged
- cout << "ivec: size: " << ivec.size()
- << " capacity: " << ivec.capacity() << endl;
- ivec.push_back(42); // add one more element
- // size should be 51; capacity will be >= 51 and is implementation defined
- cout << "ivec: size: " << ivec.size()
- << " capacity: " << ivec.capacity() << endl;
- return 0;
- }