Behavioral Design Patterns in C++ - Undo - I

The video tutorial explains the concept of command patterns, focusing on their application in transactions and the ability to compose commands into macros or queues. It discusses implementing undo and redo functionalities by storing state, which can vary based on application needs. For single-level undo, only the last command is stored, while multiple levels require a history list. The tutorial highlights the importance of storing command copies to prevent state changes from affecting previous commands. Finally, it introduces the idea of using prototypes for command objects and the need for receivers to provide operations for state restoration.

Describe how a queue of command objects can be utilized in an application.

What role do receiver objects play in the undo and redo functionality?