Complete Modern C++ - Project - Part VI (Virtual Mechanism Walk-through and Virtual Destructor)

The video tutorial explores the implementation and debugging of virtual functions in C++. It covers how the compiler generates code for virtual functions, the role of virtual pointers, and the impact on class size. The tutorial also discusses the invocation of constructors and destructors in a class hierarchy, emphasizing the importance of virtual destructors for correct polymorphic behavior. The video concludes with a demonstration of creating objects on the heap and ensuring proper destructor calls.

What is the purpose of setting a breakpoint on a function during debugging?

• To compile the code faster

• To remove errors from the code

• To speed up the execution of the program

• To stop the program execution at that point

How does the presence of virtual functions affect the size of a class?

• It increases the size of the class by the size of a pointer

• It has no effect on the class size

• It decreases the size of the class

• It doubles the size of the class

What is the effect of marking a function as virtual in a class?

• It prevents the function from being overridden

• It allows the function to be overridden in derived classes

• It makes the function private

• It deletes the function from the class

Why is it important to have a virtual destructor in a base class?

• To ensure derived class destructors are called

• To prevent the base class from being inherited

• To reduce the size of the class

• To increase the performance of the program

What happens if a base class destructor is not virtual?

• The derived class destructor may not be called

• The base class destructor is never called

• The derived class destructor is always called

• The program will not compile

What is the role of a base class pointer in polymorphism?

• It can point to objects of any class

• It can only point to objects of its own class

• It can point to objects of its derived classes

• It cannot point to any objects

How does the compiler determine which destructor to call when using a base class pointer?

• It always calls the base class destructor

• Based on the type of the pointer

• It randomly selects a destructor

• Based on the type of the object being pointed to