int
main() {
Singleton *p = Singleton::CreateInstance();
Singleton a(*p); // -- 복제 생성자 호출
a.SetData(20);
cout << "p->data = " << p->GetData() << endl; // -- p->data = 10
cout << "a.data = " << a.GetData() << endl; // -- a.data = 20
return 0;
}
