Structural Design Patterns in Modern C++ - Basic Example - Proxy Design Pattern

The video tutorial explains the Proxy design pattern, starting with the creation of a subject base class and a real subject class. It then details the implementation of a proxy class that inherits from the subject, ensuring it has the same interface as the real subject. The proxy class manages the real subject's instantiation and provides additional behavior. The tutorial demonstrates how client code interacts with the proxy, highlighting that the client remains unaware of the proxy's presence. The video concludes with a promise of more examples in future lectures.

What is the first step in implementing the proxy design pattern?

• Create the client class

• Create the subject base class

• Create the destructor

• Create the proxy class

Why should the proxy class inherit from the subject?

• To have a different interface from the real subject

• To avoid using pointers

• To manage memory allocation

• To ensure it has the same interface as the real subject

What additional behavior does the proxy provide?

• It provides additional security

• It manages the creation of the real subject instance

• It changes the client code

• It alters the interface of the real subject

How does the client code interact with the proxy?

• By modifying the proxy class

• Through the proxy without noticing any difference

• Through a different interface

• Directly through the real subject

What happens when the request method is invoked on the proxy?

• The proxy alters the request

• The client code is modified

• The real subject is immediately created

• The real subject instance is created only if needed

What is emphasized in the conclusion about the proxy design pattern?

• The proxy requires a different client code

• The proxy seamlessly integrates with the real subject

• The proxy is not suitable for all applications

• The proxy changes the client interface

What is the role of the client in the proxy design pattern?

• To create instances of the proxy

• To directly manage the real subject

• To use the features of the real subject through the proxy

• To alter the proxy's behavior