What is virtual inheritance in C++?

What is virtual inheritance in C++?

Virtual inheritance is a C++ feature that helps prevent the "diamond problem" in multiple inheritance by ensuring that only one instance of a base class is shared among derived classes.

Can you explain the diamond problem?

The diamond problem occurs when a class inherits from two classes that both inherit from a common base class, leading to ambiguity in accessing base class members.

How do I implement virtual inheritance?

To implement virtual inheritance, you declare the base class with the keyword 'virtual' in the derived class's inheritance list, like this: class Derived : virtual public Base {}.

What are the advantages of using virtual inheritance?

The main advantage is that it resolves ambiguity and ensures that only one instance of the base class is created, which saves memory and avoids inconsistencies.