Demo of virtual methods in cpp

virtual.cpp

#include <iostream>
#include <vector>

class Parent {

public:
  virtual void say() {
    std::cout << "I'm the parent" << std::endl;
  }
};

class Child: public Parent {
public:
  virtual void say() {
    std::cout << "I'm the child" << std::endl;
  }
};

int main() {
  std::vector<Parent* > liste(2);
  liste[0] = new Parent();
  liste[1] = new Child();

  for(int i = 0; i < liste.size(); i++)
    liste[i]->say();
  return 0;
}