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 to indicate that a method is intended to override a virtual method in a base class. 'final' prevents further overriding of a method or class.

Can you give me an example of using override?

Sure! Here's a simple example:

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

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

What about final? How is it used?

'final' can be used in two ways: to prevent a method from being overridden or to prevent a class from being inherited. For example:

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

class Derived final : public Base {};

Are there any performance implications of using these keywords?

Using 'override' and 'final' can help the compiler optimize the code better, as it knows the intended behavior of the methods, potentially leading to improved performance.