设计模式之备忘录模式(Memento)

#include <iostream>
#include <vector>

using namespace std;

//保存的信息
class Memento
{
public:
Memento(int vit, int att, int def)
:_vitality(vit),_attack(att),_defense(def)
{
}

Memento & operator =(const Memento &memento)
{
_vitality = memento._vitality;
_attack = memento._attack;
_defense = memento._defense;
}
public:
int _vitality; //生命值
int _attack;   //进攻值
int _defense;  //防守值
};

//游戏角色
class GameRole
{
public:
GameRole():_vitality(100),_attack(100),_defense(100){}

Memento save()
{
Memento memento(_vitality,_attack,_defense);
return memento;
}

void load(Memento memento)
{
_vitality = memento._vitality;
_attack = memento._attack;
_defense = memento._defense;
}

void show()
{
cout << "vitality : " << _vitality << ", attack : " << _attack
<< ", defense : "<< _defense << endl;
}

void attack()
{
_vitality -= 10;
_attack -= 10;
_defense -= 10;
}

private:
int _vitality;
int _attack;
int _defense;
};

//进度
class Caretake
{
public:
Caretake(){}
void save(Memento memento)
{
_VecMemento.push_back(memento);
}

Memento load(unsigned int state)
{
if(_VecMemento.size() > state)
return _VecMemento[state];
return Memento(100,100,100);
}

private:
vector<Memento> _VecMemento;
};

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(0)); //载入状态
role.show();    //恢复状态

return 0;
}