char_main.cpp

C++Primer 第四版 包括windows 平台下各章的例子程序

/*
 * 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 "char_queue.h"

#include <cstring>
using std::strncpy;
#include <string>
using std::string;

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

int main()
{
    Queue<const char*> q1;

    // dynamically allocate and initialize a char array
    char *cp = "hello";
    const size_t len = strlen("hello");
    char* hi = new char[len + 1];
    strncpy(hi, cp, len + 1);

    q1.push(hi);   // put pointer to dynamically allocated array in q1

    // delete the dynamically allocated array -- 
    // disaster if Queue holds original pointer and not a copy of the array!
    delete[] hi;     
    q1.push("world");
    q1.push("bye");

    cout << q1 << endl;

    for (int i = 0; i != 3; ++i) {
        cout << q1.front() << endl;
        q1.pop();
    }
    
    cout << "q1 is empty? " << ((q1.empty()) ? "yes" : "no") << endl;

    string hi2 = "hello";
    Queue<string> q2;
    q2.push(hi2);
    q2.push("world");
    q2.push("bye");

    cout << q2 << endl;

    for (int i = 0; i != 3; ++i) {
        cout << q2.front() << endl;
        q2.pop();
    }
    
    cout << "q2 is empty? " << ((q2.empty()) ? "yes" : "no") << endl;

    return 0;
}