// we can ask a point to write its current state
// into new memento object and return it to us
public CMemento createMemento()
{
// create a new memento
CMemento memento = new CMemento();
// store actual data inside it
memento.setState(_x, _y);
// and return it
return(memento);
}
static void Main(string[] args)
{
// create a CPoint
CPoint p = new CPoint(10, 20);
// ask a CPoint to report its current state
p.report();
// ask a CPoint to create its current memento
CMemento memento = p.createMemento();
// now we can change a point to another destination
p.move(5, 5);
// ask a CPoint to report its current state
p.report();
// however, having a memento object, we can always ask CPoint
// to return back to the state it was when memento was created
p.updateFromMemento(memento);
// ask a CPoint to report its current state
p.report();
Console.ReadKey();
}
// we can give the object a memento it has created
// a long time ago, and to ask it to read its state from memento
public virtual void updateFromMemento(CMemento memento)
{
// read actual data from memento
memento.getState(ref _x, ref _y);
}
