notepad_memento.puml

@startuml
skinparam classAttributeIconSize 0

interface "Interface \n Memento" as Memento{
    +{abstract} state():string
    +{abstract} date():string
    +{abstract} getName():string
}

class ConcreteMemento{

- string m_state
- string m_date
+ ConcreteMemento(string state)
+ string state()
+ string date()
+ string getName()
}


class Originator
{
    -string m_state;
    + Originator(string state) : m_state(state)
    Memento *Save()
    Restore(Memento* memento)
    changeText(string text):void
}

note "this->m_state = text" as OriginatorChangeText

OriginatorChangeText .. Originator::changeText

class CareTaker
{
    -stack<Memento*> m_mementos;
    -Originator *m_originator;
    +CareTaker(Originator *originator)
    +backUp():void
    +undo():void
}



note  "this->m_mementos.push(this->m_originator->Save())" as CareTakerBackUp



note "Memento* memento= m_mementos.top() \n m_mementos.pop() \n this->m_originator->Restore(memento)" as CareTakerUndo
       

CareTakerBackUp .. CareTaker::backUp
CareTaker::undo ..  CareTakerUndo

ConcreteMemento -up..|>  Memento
Originator -up..> Memento
Originator <--> ConcreteMemento
CareTaker -up--> Memento
@enduml