Behavioral Design Patterns in C++ - Basic Example-2

The video tutorial explains the implementation of the state design pattern, focusing on creating context and state classes. It covers the addition of concrete state classes and the main function, highlighting the state transitions. The tutorial also addresses issues like memory management and suggests solutions such as using smart pointers or singletons. A class diagram is generated to illustrate the design pattern.

What is the primary role of the context class in the state design pattern?

• To store the state objects

• To implement the handle function

• To manage state transitions and delegate behavior to state objects

• To define the behavior of each state

Which function in the state class is responsible for defining the behavior of a state?

• handle

• transition

• execute

• request

What happens when the handle function is called in a concrete state class?

• It deletes the current state

• It initializes the context class

• It creates a new state object

• It prints a message and transitions to another state

What is a potential issue mentioned regarding the instances created on the heap?

• They are not visible to the context class

• They do not transition correctly

• They are not initialized properly

• They are not deleted, leading to memory leaks

How can the issue of undeleted instances be addressed according to the lecture?

• By using global variables

• By implementing a destructor

• By avoiding heap allocation

• By using smart pointers or making classes Singleton