www.gusucode.com > C++ Primer 书籍源代码源码程序 > C++ Primer 书籍源代码源码程序/code/9/capacity.cpp

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/*
 * 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;
}