C++ inheritance example

struct GameObject
{
  int x{}, y{};
  virtual void update();
  virtual ~GameObject(){}
};
struct Player : public GameObject
{
  void update() override
  {
    //player code
  }
};
struct Enemy : public GameObject
{
  void update() override
  {
    //enemy code
  }
};
int main()
{

  vector<GameObject*> vec;
  vec.push_back(new Player());
  vec.push_back(new Enemy());
  vec.push_back(new Enemy());

  bool gameIsRunning = true;
  while(gameIsRunning) //game loop
  {
    for(GameObject* gameObj : vec)
      gameObj->update();
    //rest of code
  }


  for(GameObject* gameObj : vec)
    delete gameObj;
}