在 C++ 中，如何跨多个类文件访问声明的对象？

Question

我没有包含 Player.h 文件或 .cpp 文件，因为它们与我的 Monster.h 和 .cpp 文件完全相同。

我正在制作一个游戏，并在我的 Login.cpp 文件中创建了一个玩家对象，该对象将用户名和一个 int 作为参数。有没有办法在我的 BattleSystem.cpp 文件中访问我的 BattleStats() 函数中的对象参数？我的目标是最终在玩家被怪物击中时更新参数并输出这些更新的参数。

这是我的代码，谢谢你的帮助：

Main.cpp

#include "Login.h"
#include "GameManager.h"
#include "BattleSystem.h"

#include <iostream>

using namespace std;

int main() {
    BattleSystem bs;
    GameManager gm(&bs);
    Login login(&gm);

    login.StartMenu();
    cout << "ENDING" << endl;

    system("pause"); //Pause console.
    return 0; //Terminated without errors.
}

登录.h

    #pragma once
    
    #include "GameManager.h"
    #include <iostream>     
    
    using namespace std;
    
    class Player;
    class GameManager;
    class Login {
    public:
        Login(GameManager* gmPtr) : manager(gmPtr) {}
        void StartMenu();
    
    private:
        string username = "Kujo";
        Player* player;
        GameManager* manager;
    
    };

登录.cpp

#include "Login.h"              
#include "Player.h"
#include "GameManager.h"

void Login::StartMenu() {
    player = new Player(username, 100);
    manager->GameStart();

}

GameManager.h

#pragma once

class BattleSystem;
class GameManager {
public:
    GameManager(BattleSystem* bsPtr) : battle(bsPtr) {}
    void GameScenario();
    
private:
    int level = 1;
    BattleSystem* battle;

};

GameManager.cpp

#include "BattleSystem.h"
#include "Login.h"
#include "GameManager.h"

void GameManager::GameScenario() {
    battle->Encounter();

}

BattleSystem.h

#pragma once

class Player;
class Monster;
class BattleSystem {
public:
    void Encounter();
    void BattleStats();

private:
    Monster* monster;
    Player* player;

};

BattleSystem.cpp

#include "Player.h"
#include "Monster.h"
#include "BattleSystem.h"

void BattleSystem::Encounter() {
        monster = new Monster("Mini Orc", 100);
        cout << "A " << monster->GetName() << " has appeared!" << endl;
        BattleStats();
}

void BattleSystem::BattleStats() {
    cout << "Monster name: " << monster->GetName() << endl;
    cout << "Monster HP: " << monster->GetHP() << endl << endl;
    cout << "Player name: " << "PLAYER NAME HERE" << endl;
    cout << "Player HP: " << "PLAYER HP HERE" << endl << endl;
}

怪物.h

#pragma once

#include <string>
#include <iostream>

using namespace std;

class Monster {
public:
    Monster();
    Monster(string monsterName, int health);

    void SetName(string monsterName);
    void SetHP(int health);

    string GetName() const;
    int GetHP() const;

private:
    string name = "Monster";
    int healthPoints = 0;

};

怪物.cpp

#include "Monster.h"

Monster::Monster() : name("Player"), healthPoints(0) {}

Monster::Monster(string monsterName, int health) {
    name = monsterName;
    healthPoints = health;
}

void Monster::SetName(string monsterName) {
    name = monsterName;
}
void Monster::SetHP(int health) {
    healthPoints = health;
}

string Monster::GetName() const {
    return name;
}

int Monster::GetHP() const {
    return healthPoints;
}

Answer 1

尝试将friend BattleSystem 插入到您的 Player 类中。 然后您将可以从 BattleSystem 访问 Player 的私有字段。