example2_virtual.cpp

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#include <iostream>

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

class Derived : public Base {
public:
    // This will cause a compile-time error
    // void show() override {
    //     std::cout << "Derived class show function" << std::endl;
    // }
};

int main() {
    Derived d;
    d.show();  // Calls Base::show()

    return 0;
}