vtbl example

vtbl.cpp

#include <iostream>

class Base {
public:
    virtual void function1() { std::cout << "Base::function1()" << std::endl; }
    virtual void function2() { std::cout << "Base::function2()" << std::endl; }
    virtual ~Base() { std::cout << "Base destructor" << std::endl; }
};

class Derived1 : public Base {
  virtual void function1() override { std::cout << "Base::function1()" << std::endl; }
  virtual ~Derived1() { std::cout << "Derived1 destructor" << std::endl; }
};

class Derived2 : public Base {
  virtual void function2() override { std::cout << "Base::function2()" << std::endl; }
  virtual ~Derived2() { std::cout << "Derived2 destructor" << std::endl; }
};

int main() {
    Derived1* d1 = new Derived1;
    Base* b = d1;

    b->function1();
    b->function2();

    delete(b);

    return 0;
}