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#include <iostream>

#include <string>

using namespace std;

class Memento {

private:

friend class Originator;

Memento(const string& st) {

_st = st;

}

void SetState(const string& st) {

_st = st;

}

string GetState() {

return _st;

}

private:

string _st;

};

class Originator {

public:

Originator() {

_mt = nullptr;

}

Originator(const string &st) {

_st = st;

_mt = nullptr;

}

Memento* CreateMemento() {

return new Memento(_st);

}

void SetMemento(Memento* mt) {

_mt = mt;

}

void RestoreToMemento(Memento* mt) {

_st = mt->GetState();

}

string GetState() {

return _st;

}

void SetState(const string& st) {

_st = st;

}

void PrintState() {

cout << _st << "..." << endl;

}

private:

string _st;

Memento *_mt;

};

int main() {

Originator *o = new Originator();

o->SetState("old");

o->PrintState();

Memento *m = o->CreateMemento();

o->SetState("new");

o->PrintState();

o->RestoreToMemento(m);

o->PrintState();

delete o;

delete m;

return 0;

}