Behavioral Design Patterns in C++ - Basic Implementation-Observer

The video tutorial explains the basic implementation of the observer design pattern. It starts with an introduction to the pattern, followed by creating the base observer class with a pure virtual update function. The subject class is then implemented with attach, detach, and notify functions. Concrete subject and observer classes are added, managing state changes and notifications. The tutorial demonstrates using these classes in the main function and concludes with a summary and class diagram of the observer pattern.

What is the primary role of the observer class in the observer design pattern?

• To provide a pure virtual function for updates

• To manage the state of the subject

• To notify all observers of changes

• To implement the main application logic

Which function is NOT typically part of the subject class in the observer pattern?

• Execute

• Attach

• Detach

• Notify

What does the concrete subject class primarily manage?

• The user interface

• The main application logic

• The state of interest to observers

• The list of observers

How does the concrete observer respond to notifications from the subject?

• By printing a message

• By changing its own state

• By sending a notification back

• By detaching from the subject

What is a key characteristic of the relationship between the concrete subject and observers?

• Observers must return a result to the subject

• They are tightly coupled

• The subject knows the exact number of observers

• They are loosely coupled