C++ C++；-无法设置方法友谊

我试图在

Player

class上的class

GameSimulator

中将友谊设置为方法

由于某种原因，我犯了一个错误

GameSimulator.h：

---

您的GameSimulator类定义引用了指向

玩家的指针

，但不需要完整的类型。但是，您的

玩家

类定义确实需要完整类型的

游戏模拟器

从GameSimulator.h中删除

#include“Player.h”

，并取消对Player.h中

#include“GameSimulator.h”

的注释。然后，向前声明

类播放器在GameSimulator.h中

请注意，这些类的每个实现（.cpp文件）都需要包含另一个类的.h文件。
GameSimulator
是一种不完整的类型，因此编译器在编译
Player
时无法了解这些方法。相反，让
GameSimulator
在
GameSimulator.h
中向前声明
Player
，并让
Player.h
包含
GameSimulator.h
。非常感谢！伟大的回答和伟大的解释！有效还有一个小问题：当我在gameSimulator.h中编写“class player”时，我让编译器知道了player类？@nimrod我不知道你的意思。@rebert English不是我最好的。我试试看。@nimrod如果你还有问题，请再说一遍。
#ifndef GAMESIMULATOR_H_
#define GAMESIMULATOR_H_

#define NULL 0

#include "Player.h"

class GameSimulator {
public:
    void runSimulation();
    static GameSimulator* createGame();
    bool saveSession(string); // returns failure or successful
    bool loadSession(string); // returns failure or successful
    friend ostream& operator <<(ostream& out,GameSimulator& gs);
private:
    ~GameSimulator();
    GameSimulator();
    static GameSimulator* game;
    Player* *Population;
    unsigned numOfPlayers[4];
    int scores[4];
    unsigned numGeneration;
    unsigned numRounds;
};

#endif /* GAMESIMULATOR_H_ */

#ifndef PLAYER_H_
#define PLAYER_H_
// includes

#include <iostream>
using namespace std;
enum PlayerType {row,col}; // player type
enum Strategy {TrustingFool,nasty,rnd,winStayLooseShift,titForTwoTats}; // strategy type
enum Move {Cooparate , Defect}; // move type

//#include "GameSimulator.h"

class GameSimulator;

class Player {
protected:
    int *myPayoffs;
    int *otherPayoffs;
    PlayerType playerType;// row or col player
    Strategy myStrategy; // what strategy to play
    unsigned roundID;   // #id iteration
public:
    friend bool GameSimulator::saveSession(string filename);
    friend bool GameSimulator::loadSession(string filename);
    virtual ~Player() = 0;
    virtual Move getMove() = 0;
    virtual string getStartegy() = 0;
    Player();
};


#endif /* PLAYER_H_ */

../Player.h:30:56: error: invalid use of incomplete type ‘struct GameSimulator’
../Player.h:20:7: error: forward declaration of ‘struct GameSimulator’
../Player.h:31:56: error: invalid use of incomplete type ‘struct GameSimulator’
../Player.h:20:7: error: forward declaration of ‘struct GameSimulator’
../Player.h: In member function ‘bool GameSimulator::saveSession(std::string)’:
../Player.h:28:11: error: ‘unsigned int Player::roundID’ is protected
../GameSimulator.cpp:43:54: error: within this context
../Player.h:24:7: error: ‘int* Player::myPayoffs’ is protected
../GameSimulator.cpp:44:34: error: within this context
../Player.h:28:11: error: ‘unsigned int Player::roundID’ is protected
../GameSimulator.cpp:51:54: error: within this context
../Player.h:25:7: error: ‘int* Player::otherPayoffs’ is protected
../GameSimulator.cpp:52:34: error: within this context
../Player.h:28:11: error: ‘unsigned int Player::roundID’ is protected
../GameSimulator.cpp:58:33: error: within this context
../Player.h:26:13: error: ‘PlayerType Player::playerType’ is protected
../GameSimulator.cpp:71:34: error: within this context
make: *** [GameSimulator.o] Error 1