memento模式

 http://www.cnblogs.com/w0w0/archive/2012/05/21/2512153.html

http://www.cnblogs.com/mayvar/archive/2011/09/08/wanghonghua_201109080336.html

#include <iostream>
#include <string>
#include <vector>
#include <cstdlib>
#include <map>
#include <list>
#include <algorithm>
#include <cstring>
#include <string.h>

using namespace std;

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;
};


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;
}