Depending on the software we are writing, we might have a requirement to be able to restore the state of an object back to its previous state.
The original memento design pattern is implemented with the help of three main objects:
- Originator: The object whose state we want to be able to restore
- Caretaker: The object that triggers the changes to the originator object and uses the memento objects for rollback, if needed
- Memento: The object that carries the actual state of the originator and can be used to restore to one of the previous states
It is important to know that ...