If there are no calls to constructors in the initialization list, an implicit copy constructor of a derived class always calls the copy constructors of the base classes. On the other hand an explicit copy constructor of the derived class (one defined by the programmer) will call the default constructors of the base classes.

Why the World Needs More Technology Leadership
As a fact, technology has touched every single aspect of our lives. And there are some technology giants in today’s world which have been frequently opined to have a strong influence on recent overall technological influence. Moreover, those tech giants have popular technology leaders leading the companies toward achieving greatness.