#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; 
}