Behavioral Design Patterns in C++ - Introduction-Chain Of Responsibility

The video tutorial covers the Chain of Responsibility design pattern, which allows multiple objects to handle a request, reducing coupling between the sender and receiver. The pattern forms a chain of handlers, where each handler has a link to its successor. The request is passed along the chain until a handler processes it. The tutorial explains the pattern's intent, structure, and implementation, including handling unhandled requests using a null object.

What is the primary goal of the Chain of Responsibility pattern?

• To decouple the sender and receiver by allowing multiple handlers

• To couple the sender and receiver tightly

• To ensure only one handler processes a request

• To simplify the request handling process by using a single handler

What is a key characteristic of handlers in the Chain of Responsibility pattern?

• They must all handle the request

• They must all be known at compile time

• They are always executed in parallel

• They can be added or removed at runtime

In the Chain of Responsibility pattern, what happens if the first handler cannot process the request?

• The request is discarded

• The request is sent back to the sender

• The request is passed to the next handler in the chain

• The request is processed by the first handler anyway

What is the role of a null object in the Chain of Responsibility pattern?

• To handle requests that fall off the chain

• To ensure every request is processed by the first handler

• To act as a backup handler for all requests

• To terminate the chain immediately

How are handlers linked in the Chain of Responsibility pattern?

• By using a global variable

• By defining links in each handler or in a base handler class

• Through a static list of handlers

• Through a central dispatcher