Behavioral Design Patterns in C++ - Basic Implementation - II

The video tutorial explains the command pattern by creating a new clause and implementing a command interface. It introduces the concept of a concrete command that interacts with a receiver, storing state before executing actions. The tutorial covers the execution method, state management, and the removal of inheritance relationships. It also analyzes the class diagram, highlighting differences from previous implementations. The video concludes with a summary and a preview of the next topic, which involves decoupling the invoker and receiver.

What is the purpose of adding a receiver pointer in the concrete command?

• To execute the command independently

• To allow the concrete command to interact with the receiver

• To initialize the command interface

• To store the command state permanently

In the execute method of the concrete command, what is the primary action performed?

• Storing the command state

• Initializing the receiver pointer

• Removing the inheritance relationship

• Invoking the action method of the receiver

Why is the inheritance relationship removed in the new implementation?

• To allow multiple inheritance

• To simplify the class diagram

• Because the command is already implemented in the concrete command

• To enable the receiver to execute commands

What is a key difference in the new class diagram compared to the earlier implementation?

• The command interface is implemented by a separate class

• The receiver now implements the command interface

• The concrete command stores the receiver's state

• The invoker directly executes the receiver's method

What role does the invoker play in the new implementation?

• It initializes the receiver

• It directly executes the command

• It invokes the method in the concrete command

• It stores the command state