#include <iostream>

#include <vector>

using namespace std;

//需保存的信息

class Memento

{

public:

    int m_vitality; //生命值

    int m_attack;   //进攻值

    int m_defense;  //防守值

public:

    Memento(int vitality, int attack, int defense):

      m_vitality(vitality),m_attack(attack),m_defense(defense){}

    Memento& operator=(const Memento &memento)

    {

        m_vitality = memento.m_vitality;

        m_attack = memento.m_attack;

        m_defense = memento.m_defense;

        return *this;

    }

};  

//游戏角色

class GameRole

{

private:

    int m_vitality;

    int m_attack;

    int m_defense;

public:

    GameRole(): m_vitality(),m_attack(),m_defense() {}

    Memento Save()  //保存进度，只与Memento对象交互，并不牵涉到Caretake

    {

        Memento memento(m_vitality, m_attack, m_defense);

        return memento;

    }

    void Load(Memento memento)  //载入进度，只与Memento对象交互，并不牵涉到Caretake

    {

        m_vitality = memento.m_vitality;

        m_attack = memento.m_attack;

        m_defense = memento.m_defense;

    }

    void Show() { cout<<"vitality : "<< m_vitality<<", attack : "<< m_attack<<", defense : "<< m_defense<<endl; }

    void Attack() { m_vitality -= ; m_attack -= ;  m_defense -= ; }

};

//保存的进度库

class Caretake

{

public:

    Caretake() {}

    void Save(Memento menento) { m_vecMemento.push_back(menento); }

    Memento Load(int state) { return m_vecMemento[state]; }

private:

    vector<Memento> m_vecMemento;

};

//测试案例

int main()

{

    Caretake caretake;

    GameRole role;

    role.Show();   //初始值

    caretake.Save(role.Save()); //保存状态

    role.Attack();

    role.Show();  //进攻后

    role.Load(caretake.Load()); //载入状态

    role.Show();  //恢复到状态0

    return ;

}