C++实现备忘录模式

/*
备忘录模式：在不破坏一个对象的封装性的前提下，获取一个对象的内部状态，并将其保存在对象之外，
使得对象可以恢复到原先保存的状态。
Created by Phoenix_FuliMa
*/

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

class Memento
{
private:
string state;

public:
Memento(string state)
:state(state)
{}
string GetState()
{
return state;
}
void SetState(string state)
{
this->state = state;
}
};

class CareTaker
{
private:
Memento *memento;

public:
void SetMemento(Memento *memento)
{
this->memento = memento;
}
Memento* GetMemento()
{
return this->memento;
}
};

class Originator
{
private:
string state;

public:
Originator(string state)
{
this->state = state;
}

void RestoreMemento(Memento *memento)
{
state = memento->GetState();
}

Memento *CreateMemento()
{
return new Memento(state);
}

void SetState(string state)
{
this->state = state;
}

void  ShowState()
{
cout<< this->state <<endl;
}
};

int main()
{
Originator *originator = new Originator("2012年11月11日，光棍节，一个人，没有女朋友");
CareTaker  *caretaker  = new CareTaker();
caretaker->SetMemento(originator->CreateMemento());

cout<<"2012年11月11日，光棍节早晨的状态是："<<endl;

originator->ShowState();

originator->SetState("中午参加同学婚礼去了，锦府盐帮饭店");
originator->ShowState();

cout<<"晚上回来的状态是"<<endl;
originator->RestoreMemento(caretaker->GetMemento());
originator->ShowState();

cout<<"跟早晨一样，嗨"<<endl;

system("pause");
return 0;
}