Structural Design Patterns in Modern C++ - User Interface (UI) Example - Part II

The video tutorial addresses issues in a design involving add and remove methods in a base class. It discusses the challenges faced by leaf classes that cannot implement these methods and suggests handling them by throwing exceptions. The tutorial explores alternative solutions, such as using a Getframe function to manage method calls. It also covers memory management, emphasizing the importance of deleting objects created on the heap, especially in languages without garbage collection. The responsibility of deleting children in a composite is highlighted, ensuring no memory leaks occur.

Why are the add and remove methods kept empty in the leaf classes?

• To avoid runtime errors

• To allow for future implementation

• Because leaf classes cannot have children

• Because they are not needed in the composite class

What is the main drawback of removing add and remove methods from the base class?

• It simplifies the design

• It requires distinguishing between composite and leaf classes

• It allows for better error handling

• It makes the code more efficient

What is the purpose of the Getframe function?

• To handle exceptions in leaf classes

• To determine if a widget is a frame

• To add new widgets to a frame

• To remove widgets from a frame

What should the client do before calling add on a widget?

• Check if the widget is a frame using Getframe

• Directly call add without any checks

• Ensure the widget is a leaf class

• Throw an exception if the widget is not a frame

Why are UI components generally created on the heap?

• To improve performance

• To allow for dynamic memory allocation

• Because they are used across the application

• To simplify the code structure

Who is responsible for deleting the children in a composite?

• The leaf classes

• The composite itself

• The base class

• The client

What function is used to check for memory leaks in the program?

• LeakChecker

• MemoryLeakDetector

• Crtdummemoryleaks

• CheckMemoryLeaks