c++ 23种设计模式之备忘录模式

#include <iostream>
#include <string>
using namespace std;

//c++ 23种设计模式之备忘录模式
class Memo;

// 发起人类
class Originator
{
public:
string state;
Memo* CreateMemo();
void SetMemo(Memo* memo);
void Show()
{
cout<<"状态："<<state<<endl;
}
};
// 备忘录类
class Memo
{
public:
string state;
Memo(string strState)
{
state= strState;
}
};

Memo* Originator::CreateMemo()
{
return new Memo(state);
}

void Originator::SetMemo(Memo* memo)
{
state = memo->state;
}

// 管理者类
class Caretaker
{
public:
Memo* memo;
};

//客户端：
int main()
{
Originator* on=new Originator();
on->state = "on";
on->Show();

Caretaker* c= new Caretaker();
c->memo = on->CreateMemo();

on->state = "off";
on->Show();

on->SetMemo(c->memo);
on->Show();
return 0;
}