subscript.cpp

C++_Primer_Book_and_Code.rar 第四版C++ PRIMER的中英文对照书和源代码

/*
 * 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: [phone]
*/ 

#include <vector>
using std::vector;
#include <iostream>
using std::cout; using std::endl;

class Foo {
public:
Foo(): data(100) { for (int i = 0; i != 100; ++i) data[i] = i; }
    int &operator[](const size_t);
    const int &operator[](const size_t) const;
    // other interface members
private:
    vector<int> data;
    // other member data and private utility functions
};

int& Foo::operator[](const size_t index)
{
	return data[index];   // no range checking on index
}

const int& Foo::operator[](const size_t index) const
{
	return data[index];   // no range checking on index
}

int main() {
    Foo f;

    cout << f[50] << endl;
    return 0;
}