Behavioral Design Patterns in C++ - Basic Implementation-Template Method

The video tutorial explains the template method pattern, starting with the creation of an abstract base class that defines the template method and primitive operations. It discusses how clients can modify the algorithm by implementing subclasses and overriding specific steps, while some steps remain fixed. The tutorial also highlights the importance of preventing clients from directly invoking primitive operations by declaring them as protected. Finally, it presents a class diagram to illustrate the pattern's structure.

What is the role of the template method in the pattern?

• To define the algorithm's structure and allow customization of certain steps

• To serve as a placeholder for future methods

• To handle all operations without any subclass involvement

• To provide a fixed implementation that cannot be changed

Which steps must a subclass implement in the template method pattern?

• Only the optional steps

• None, as the base class handles everything

• All steps, including fixed ones

• Compulsory steps that are pure virtual in the base class

Why is it important to prevent clients from directly invoking primitive operations?

• To ensure the algorithm remains flexible

• To avoid generating invalid output

• To make the code more complex

• To allow clients to modify the algorithm freely

How can subclasses access and override methods in the base class?

• By declaring them as public

• By declaring them as private

• By declaring them as protected

• By using global variables

What does the class diagram illustrate in the context of the template method pattern?

• The user interface of the application

• The structure of the pattern, including customizable and fixed steps

• The complete implementation of the algorithm

• Only the fixed steps of the algorithm