fcnobj.cpp
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上传日期:2022-06-29
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书籍源码
开发平台:
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 <functional>
- using std::plus; using std::negate;
- #include <iostream>
- using std::cout; using std::endl;
- #include <vector>
- #include <algorithm>
- using std::count_if; using std::bind2nd; using std::not1; using std::ptr_fun;
- using std::less_equal; using std::vector;
- #include <iostream>
- using std::cin;
- #include <string>
- using std::string;
- bool size_compare(string s, string::size_type sz)
- {
- return s.size() >= sz;
- }
- int main() {
- cout << plus<int>()(3,4) << endl; // prints 7
- plus<int> intAdd; // function object that can add two int values
- negate<int> intNegate; // function object that can negate an int value
- // uses intAdd::operator(int, int) to add 10 and 20
- int sum = intAdd(10, 20); // sum = 30
- cout << sum << endl;
- // uses intNegate::operator(int) to generate -10 as second parameter
- // to intAdd::operator(int, int)
- sum = intAdd(10, intNegate(10)); // sum = 0
- cout << sum << endl;
- int arry[] = {0,1,2,3,4,5,16,17,18,19};
- vector<int> vec(arry, arry + 10);
- cout <<
- count_if(vec.begin(), vec.end(),
- bind2nd(less_equal<int>(), 10));
- cout << endl;
- cout <<
- count_if(vec.begin(), vec.end(),
- not1(bind2nd(less_equal<int>(), 10)));
- cout << endl;
- return 0;
- }