Behavioral Design Patterns in C++ - Hangman - V

The lecture discusses an improved design for a game state structure, focusing on making attributes private and using a friend class to control access. It explains the creation of wide and narrow interfaces, the use of private constructors, and exception handling. The Memento design pattern is implemented, with the game state as a nested class of the originator, and the checkpoint manager acting as the caretaker. The lecture concludes with a promise to discuss alternative implementations in the next session.

Why was it necessary to make the game state attributes private?

• To restrict access to only the Hangman class

• To allow all classes to access them

• To make them accessible to the public

• To prevent the Hangman class from accessing them

What is the purpose of the friend declaration in this context?

• To enable the Hangman class to access private attributes

• To make the game state class public

• To allow any class to modify the game state

• To prevent the Hangman class from accessing the game state

How does the public destructor contribute to the narrow interface?

• It allows the game state to be created by any class

• It makes the game state attributes public

• It enables the caretaker class to destroy game state instances

• It prevents the Hangman class from accessing the game state

In the Memento design pattern, what role does the game state play?

• Originator

• Caretaker

• Memento

• Observer

What is the role of the checkpoint manager in the Memento design pattern?

• It acts as the originator

• It manages the game state for the Hangman class

• It is responsible for creating game state instances

• It serves as the memento