Structural Design Patterns in Modern C++ - Applying Virtual Proxy

The video tutorial explains the concept of a bitmap proxy, which inherits from an image class to maintain the same interface as a bitmap. It covers the use of inheriting constructors to simplify implementation and the importance of a destructor for managing bitmap instances. The tutorial demonstrates how to check if a bitmap is loaded, how to load it conditionally based on the file name, and the benefits of using a proxy to avoid expensive loading processes. It concludes with a class diagram illustrating the interaction between the client, bitmap proxy, and bitmap.

Why is it necessary for the Bitmap proxy to inherit from the image class?

• To maintain the same interface as the bitmap

• To reduce memory usage

• To implement additional features

• To simplify the code structure

What is the purpose of the boolean member variable in the Bitmap proxy?

• To manage memory allocation

• To handle error messages

• To track the loading state of the bitmap

• To store the file name

What mistake was identified in the initial implementation of the Bitmap proxy?

• Forgetting to include a destructor

• Incorrectly implementing the display function

• Using the wrong data type for file names

• Not creating instances of the bitmap class

How do delegating constructors help in the Bitmap proxy implementation?

• They reduce code repetition

• They enhance security

• They simplify error handling

• They improve performance

What is the main advantage of using a bitmap proxy?

• It reduces the complexity of the code

• It avoids the expensive loading process until necessary

• It increases the speed of loading

• It enhances the graphical quality

How does the bitmap proxy interact with the client and bitmap?

• It directly modifies the bitmap

• It acts as an intermediary, handling calls from the client to the bitmap

• It replaces the bitmap in the client

• It only interacts with the client

What is the next topic to be covered after the virtual proxy?

• Performance optimization

• Error handling

• Advanced graphics rendering

• Protection proxy