What is the difference between override and final in C++?

What is the difference between override and final in C++?

In C++, 'override' is used in a derived class to indicate that a method is intended to override a virtual method in the base class. 'final' is used to prevent further overriding of a method in derived classes.

Can you give me an example of how to use them?

Sure! Here's a simple example:

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

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

class FinalDerived : public Derived {
public:
    void display() final { std::cout << "FinalDerived display"; }
};

What happens if I try to override a final method?

If you try to override a method marked as 'final', the compiler will throw an error, indicating that the method cannot be overridden.

Are there any performance implications of using these keywords?

Using 'override' and 'final' can help the compiler optimize the code, as it provides more information about method behavior, potentially leading to better performance.