Memento

#include <cstdlib>
#include <iostream>
#include <string>
using namespace std;
class Object;
class Memento
{
  string name;
public:
  Memento(string str):name(str){}
  friend class Object;
};
class Object
{
  string name;
public:
  void Setname(string str){name = str;}
  Memento* CreateMemento(){return new Memento(name);}
  void Print(){cout<<name<<endl;}
  void RestoreFromMemento(Memento* m){name = m->name;}
};
int main(int argc, char *argv[])
{
    Object obj;
    obj.Setname("old");
    obj.Print();
    Memento* pm = obj.CreateMemento();
    obj.Setname("new");
    obj.Print();
    obj.RestoreFromMemento(pm);
    obj.Print();
    system("PAUSE");
    return EXIT_SUCCESS;
}