C++ OOP - 丢失数据

Question

我有几个简单的课程,我无法让他们工作.

TL; DR我有一个"播放器"实例,在我将一些数据设置到实例后,我可以将其恢复.如果我将实例推送到std :: vector Players; 如果我有Players.at(0).getName()则返回"".数据不存在!离开了.(调试应用程序,我在"vPlayer"和"Players"中设置"_name",我看到一个元素,"_ name"="")

这是代码:

//Player.h
#ifndef PLAYER_H
#define PLAYER_H

#include <iostream>

class Player
{
public:
    Player();
    Player(const Player &Player);
    Player& operator=(const Player &Player);
    std::string getName();
    bool        setName(const std::string &name);
    bool        nameValid(const std::string &name);

private:
    std::string _name;
};



#endif



//Player.cpp

#include "Player.h"
#include <iostream>
#include <string>
using namespace std;

Player::Player()
{

}
Player::Player(const Player &Player)
{

}
Player& Player::operator=(const Player &Player) {
    return *this;
}

std::string Player::getName()
{
    return this->_name;
}

bool Player::setName(const std::string &name)
{
    if ( ! this->nameValid(name) )
    {
        return false;
    }

    this->_name = name;
    return true;
}

bool Player::nameValid(const std::string &name)
{
    return name.empty() == false;
}




//Map.h
#ifndef MAP_H
#define MAP_H

#define MAP_X 40
#define MAP_Y 40

#include "Player.h"
#include "Point.h"
#include <vector>

class Map
{
public:
    Map();
    bool movePlayer(Player &Player, Point &Point);
    std::vector<Player> getPlayers();
private:

};

#endif //MAP_H



//Map.cpp

#include "Map.h"
#include "Player.h"
#include "Point.h"
#include <iostream>
#include <string>

using namespace std;

Map::Map()
{

}

bool Map::movePlayer(Player &Player, Point &Point)
{
    return true;
}
std::vector<Player> Map::getPlayers()
{
    Player vPlayer;
    vPlayer.setName(std::string("test"));
    std::vector<Player> Players;

    Players.push_back(vPlayer);

    return Players;
}

在主要:

  std::vector<Player> Players = vMap.getPlayers();
  cout<<"Test:"<<Players.at(0).getName()<<endl;

Answer 1

您可以定义类的复制构造函数和复制赋值运算符以不执行任何操作.您如何期望向量中的副本与放入向量的实例具有相同的数据？

使用默认的,编译器生成的复制构造函数和复制赋值运算符,您的类可以完全正常,因此只需删除它们的声明和定义,一切都会正常工作.