好友功能无法访问私人模因

我开始学习运算符重载，起初似乎很容易，但现在在尝试创建全局功能运算符时访问私有成员时遇到问题

玩家.hpp

#ifndef _PLAYER_HPP_
#define _PLAYER_HPP_
#include <iostream>
#include <string>
#include "item.h"
class player
{
friend player operator+(player& obj, player& tem);
static int numPlayer;
float *health;
int mspeed;
int damage;
int xp;
std::string name;
public:
// Constructors
player(std::string = "player", float _health = 100, int _xp = 0);
// Copy Constructor
player(const player& obj);
// Move Constructor
player(player&& obj);
// Functions
void display();

// Friends functions
friend void test(player user);
friend player operator+(player &&obj, const item &tem);
// Diconstructors
~player();
};

#endif // _PLAYER_HPP_

播放器.cpp

#include "player.hpp"
#include "item.h"
#include <iostream>
#include <cstring>
#include <string>
int player::numPlayer = 0;
// Constructors
player::player(std::string _name, float _health, int _xp) {
numPlayer++;
this->health = new float;
*this->health = _health;
this->xp = _xp;
this->name = _name;
std::cout << "constructor for " << this->name << std::endl;
}
// Copy constructors
player::player(const player& obj) {
this->health = new float;
*this->health = *obj.health;
this->xp = obj.xp;
this->name = obj.name;
std::cout << "copy constructor for " << this->name << std::endl;
}
// Move Constructors
player::player(player&& obj) {
this->damage = 60;
this->mspeed = 50;
this->health = obj.health;
this->xp = obj.xp;
this->name = obj.name;
obj.health = nullptr;
std::cout << "Move constructor for " << this->name << std::endl;
}
void player::display() {
std::cout << "========================" << std::endl
<< this->name << std::endl
<< *this->health << std::endl
<< this->xp << std::endl
<< this->damage << std::endl
<< this->mspeed << std::endl;
}
player::~player() {
delete[] health;
std::cout << "distruction for: " << name << std::endl;
}
void test(player user) {
std::cout << user.name << std::endl;
}
player operator+(player&& obj, const item& tem) {
*obj.health += tem.health;
obj.damage += tem.damage;
obj.mspeed += tem.ms;
return obj;
}

项.h

#ifndef _ITEM_H_
#define _ITEM_H_
#include <iostream>
#include <string>
#include "player.hpp"
class item {
int damage; // Bonus damage
int health; // Bonus health
int ms; // Bonus Movement speed
std::string name; // item name
public:
//constructor
item(std::string name, int _damage = 0, int _health = 0, int _ms = 0)
: name {name}, damage {_damage}, health{_health}, ms {_ms}{}

friend player operator+(player &&obj,const item &tem);
};
#endif // _ITEM_

主.cpp

#include <iostream>
#include <string>
#include "player.hpp"
#include "item.h"
player operator+(player&& obj, const item& tem);
void test(player user);
void main(int args, char* argv) {
player a("YASOU96");
item deathSword("death Sword", 150, 0, 20);
a.display();
a = a + deathSword;
a.display();
}

我没有看到那里有错误，但它一直显示在 Visual Studio 项目类成员是私有的(无法访问 em)，如果我在 player.hpp 和 item.h 标题顺序之间切换，我可以访问项目私有成员，然后我失去了对 player.hpp 私有成员的访问权限

任何帮助将不胜感激。