What is virtual inheritance in C++?

What is virtual inheritance in C++?

Virtual inheritance is a C++ feature that helps prevent ambiguity in the diamond problem when using multiple inheritance.

Can you explain the diamond problem?

The diamond problem occurs when a class inherits from two classes that have a common base class, leading to ambiguity in method resolution.

How does virtual inheritance solve this problem?

Virtual inheritance ensures that only one instance of the common base class is shared among the derived classes, eliminating ambiguity.

Can you provide a code example?

Sure! Here's a simple example:

class Base {
public:
    void display() { std::cout << "Base class"; }
};

class Derived1 : virtual public Base {};
class Derived2 : virtual public Base {};

class Final : public Derived1, public Derived2 {};

int main() {
    Final obj;
    obj.display(); // Calls Base::display()
}