c++ - 枚举序列化？ C++

Question

我想先从总体上说我是初学者，所以我可能看不到任何东西。

我的主要目标是能够将已定义类的对象输出到文件，以便在另一个实例中读取。

即

Player obj 被写入包含其所有变量的文件。 前惠普。全科医生，高清但我也有两个枚举类型

枚举英雄{法师、战士、盗贼}；/enum RACE {HUMAN, ORC, ELF, DWARF, GNOME};

我一直在四处寻找，发现重载 << 和 >> 运算符是一种实现此目的的方法。我的问题是 >> 运算符不喜欢我的 HERO 和 RACE 类型。

这就是我的立场。

播放器.h

#pragma once
#include <iostream>

enum HERO {MAGE, WARRIOR, ROGUE}; 
enum RACE {HUMAN, ORC, ELF, DWARF, GNOME}; 
using namespace std;

class Player
{
public:
Player();
    Player();
int returnHP();
int returnATK();
int returnDEF();
int returnGP();
HERO returnCLASS();
RACE returnRACE();
int setHP(int x);
int setGP(int x);
int setATK(int x);
int setDEF(int x);
HERO setCLASS(HERO x);
RACE setRACE(RACE x);
void setNAME(string namei);


private:
int hp;
int gp;
int def;
int atkdmg;
char name[30];
HERO playerClass;
RACE playerRace;
friend istream& operator >> (istream& in, Player& obj);
friend ostream& operator << (ostream& out, const Player& obj);
 };

播放器.cpp

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

using namespace std;

Player::Player(){

    hp = 0;
    gp = 0;
    def = 0;
    atkdmg = 0;
    strcpy(name,"noname");
    playerClass = WARRIOR;
    playerRace = HUMAN;


}




istream& operator >> (istream& in, Player& obj)
{
in >> obj.hp;
in >> obj.gp;
in >> obj.def;
in >> obj.atkdmg;
in >> obj.name;
in >> obj.playerRace;
in >> obj.hp;

return in;
}
ostream& operator << (ostream& out, const Player& obj)
{
out << obj.hp;
out << obj.gp;
out << obj.def;
out << obj.atkdmg;
out << obj.name;
out << obj.playerRace;
out << obj.hp;
return out;
}

我知道这可能看起来像垃圾，但都是自学的。任何帮助表示赞赏!提前致谢!

Answer 1

解决问题的最简单方法是在为 Player 类定义流运算符之前为枚举类定义流运算符。例如，对于 RACE:

istream& operator >> (istream& in, RACE& race)
{
    unsigned u = 0;
    in >> u;
    //TODO: check that u is a valid RACE value
    race = static_cast<RACE>(u);
    return in;
}

ostream& operator << (ostream& out, RACE race)
{
    //TODO: check that race is a valid RACE value
    unsigned u = race;
    out << u;
    return out;
}

出于兼容性/对称性原因，还应定义输出运算符。