C++ 继承 vector 问题(无限循环+在其他类中使用 vector 的问题)

Question

我正在制作一个表面，让用户输入信息并打印出来。

这就是它的样子。

main <- menu <- Reservation
             <- BookingManager <- BookingRecord

我创建了一个 vector vector<string> CompanyName在预订中，
这是outputdataInfo()添加公司名称，

void Reservation::outputdataInfo()
{
    string CompName;
    cout << "Company Name <-" << endl;
    cin >> CompName;
    Reservation::setCompanyName(string (CompName) );
    cout << CompanyName.at(0) << endl;
    // Use for test and it works
    cout << CompanyName.size() << endl;
    // Use for test and it works
    cout << "End of Reservation, thank you." << endl;
}

CompanyName 的设置者:(工作)

void Reservation::setCompanyName(const string& cn)
{this->CompanyName.push_back(cn);}

但是现在BookingRecord::outputdataInfo()想打印预订记录。

void BookingRecord::outputdataInfo()
{
    cout << "      ----- Booking Record -----" << endl;
    Reservation::printBookingRecord();
}

我这样写(不确定这是否正确):

void Reservation::printBookingRecord() {
    for (int i = 0; i < CompanyName.size(); i++) {
        cout << " ---- Company ---- " << endl;
        cout << "Name: " << CompanyName.at(i) << endl;
    }
}

但是 CompanyName 突然看起来好像什么都忘记了，或者像重置了大小。
结果是BookingRecord::outputdataInfo()无限不停地打印，但 Reservation::printBookingRecord() 没有任何 react .这很奇怪，因为假设 BookingRecord::outputdataInfo() 中没有 for 循环.
我想知道如何打印数据( Reservation::printBookingRecord() 由 BookingRecord::outputdataInfo() 调用，但 vector 位于“保留”处)
(或者 vector 可以在其他类中使用)
非常感谢 :)

源代码 (有点长)

//
//  main.cpp
//
#include <iostream>
#include <string>
#include <cstdlib>
#include <vector>
#include "Menu.h"
#include "Reservation.h"
#include "BookingManager.h"
using namespace std;
int main(int argc, const char* argv[]) {
    Menu m;
    Reservation R;
    BookingManager BM;
    char choice;
    do {
        choice = m.menu();
        switch (choice)
        {
        case 'R': case 'r':
            R.outputdataInfo();
            break;
        case 'B': case 'b':
            BM.outputdataInfo();
            break;
        default:
            cout << "Invalid Alphabet. Please try again." << endl;
            break;
        }
    } while (choice == 'R' || choice == 'r' || choice == 'B' || choice == 'b');
    return 0;
}
//.....................
//  Menu.h
//
#include <iostream>
#ifndef Menu_h  
#define Menu_h  
class Menu {
public:   //Accessibility as public
    char option;
    char menu();
};
#endif
//.....................
//  Menu.cpp
//
#include <iostream>
#include "Menu.h"
using namespace std;
char Menu::menu() {
    cout << "" << endl;
    cout << "        BNC Exhibition Tour in European Cities" << endl;
    cout << "               Exhibition Recruitment         " << endl;
    cout << "                                              " << endl;
    cout << "Please type:" << endl;
    cout << "R -> for Reservation Page" << endl;
    cout << "B -> for Booking Manager Page" << endl;
    cout << "And Press ENTER." << endl;
    cin >> option;
    cout << "" << endl;
    return option;
}
//.............................
//  Reservation.h
//
#include <iostream>
#include <vector>
using namespace std;
#ifndef Reservation_h  
#define Reservation_h  
class Reservation {
private:
    vector<string> CompanyName;
public:   //Accessibility as public
    void outputdataInfo();
    void setCompanyName(const string& cn);
    Reservation();
    ~Reservation();
    void printBookingRecord();
};
#endif
//.....................................
//  Reservation.cpp
//
#include <iostream>
#include <string>
#include <sstream>
#include <cstdlib>
#include <vector>
using namespace std;
#include "Reservation.h"
void Reservation::outputdataInfo()
{
    cout << "Please input detail information first :" << endl;
    string CompName;
    cout << "Company Name <-" << endl;
    cin >> CompName;
    Reservation::setCompanyName(string (CompName) );
    cout << CompanyName.at(0) << endl; //it works
    cout << CompanyName.size() << endl; //it works
    cout << "End of Reservation, thank you." << endl;
}
//////////////////////// S E T T E R ////////////////////
void Reservation::setCompanyName(const string& cn)
{
    this->CompanyName.push_back(cn);
}
//////////////////////// S E T T E R ////////////////////
Reservation::Reservation() {}
Reservation::~Reservation() {}
/////////////////////// P R I N T ///////////////////////
void Reservation::printBookingRecord() {
    for (int i = 0; i < CompanyName.size(); i++) {
        cout << " ---- Company ---- " << endl;
        cout << "Name: " << CompanyName.at(i) << endl;
    }
}
//.............................
//  BookingManager.h
//
#include <iostream>
#include <vector>
#ifndef BookingManager_h  
#define BookingManager_h  
class BookingManager {
public:   //Accessibility as public
    char option;
    void outputdataInfo();
};
//..........................................
//  BookingManager.cpp
//
#include <iostream>
#include <string>
#include <sstream>
#include <cstdlib>
#include <vector>
#include "BookingManager.h"
#include "BookingRecord.h"
using namespace std;
void BookingManager::outputdataInfo() {
    BookingRecord BR;
    cout << "" << endl;
    cout << "      ----- Booking Manager -----" << endl;
    cout << "" << endl;
    cout << "Please type:" << endl;
    cout << "B -> for Booking Record" << endl;
    cout << "And Press ENTER." << endl;
    cin >> option;
    cout << "" << endl;
    do {
        switch (option)
        {
        case 'B': case 'b':
            BR.outputdataInfo();
            break;
        default:
            cout << "Invalid Alphabet. Please try again." << endl;
            break;
        }
    } while (option == 'B' || option == 'b');
}
#endif
//...........................................
//  BookingRecord.h
//
#include <iostream>
#include <vector>
#include "Reservation.h"
#ifndef BookingRecord_h  
#define BookingRecord_h  
class BookingRecord : public Reservation {
public:   //Accessibility as public
    void outputdataInfo();
};
#endif
//..........................................
//  BookingRecord.cpp
//
#include <iostream>
#include <string>
#include <vector>
#include "Reservation.h"
#include "BookingRecord.h"
void BookingRecord::outputdataInfo()
{
    cout << "" << endl;
    cout << "      ----- Booking Record -----" << endl;
    cout << "" << endl;
    cout << "     Print all the information..." << endl;
    Reservation::printBookingRecord();
}
// END

Answer 1

所以你有两个 CompanyNames在你的代码中。

一个在这里，R 的一部分多变的。

int main(int argc, const char* argv[]) {
    Menu m;
    Reservation R; 

另一个在这里

void BookingManager::outputdataInfo() {
    BookingRecord BR;

BookingRecord源自 Reservation , 所以它还包含一个 CompanyName .

我认为很明显，您正在向 CompanyName 添加名称在 R在 main但打印出 CompanyName在 BR在 BookingManager::outputdataInfo .

类设计在我看来是错误的。例如，您的方法缺少参数。当然 BookingManager::outputdataInfo应该采取BookingRecord作为参数允许调用者指定哪个BookingRecord他们想输出。只需声明 BookingRecord作为 BookingManager::outputdataInfo 中的局部变量没有任何意义。

在您急于编写大量代码之前，请尝试考虑您的类的设计。不同的类应该如何相互关联，需要哪些成员变量，需要哪些方法，这些方法需要哪些参数和返回类型。考虑你的类如何模拟现实世界，而不是你将如何实现功能。稍后，请先正确设计。