What is the override keyword in C++?

What is the override keyword in C++?

The override keyword in C++ is used in derived classes to indicate that a member function is intended to override a virtual function in a base class.

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

Sure! Here's a simple example:

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

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

In this example, Derived::display overrides Base::display.

What happens if I don't use the override keyword?

If you don't use the override keyword, the compiler won't check if you're actually overriding a base class function. This can lead to subtle bugs if the function signatures don't match.

Is the override keyword mandatory?

No, it's not mandatory, but it's highly recommended as it improves code readability and helps catch errors at compile time.