if (day_of_year % 256 == 0) Celebrate();

The code below has some contractions, please do not try to ... it.


class God
{
   void DoNothing ();

private:
   void CreateSomeWorld ();

   friend class Alien;
}



class Human : public God
{
   Human (const Human& mother, const Human& father);  // birth
   virtual ~Human (); // death

   virtual bool AreYouHappy () = 0;
   virtual void BeHappy (Stuff reason) = 0;

   virtual void WasteTime ()
   {
      DoNothing ();  // you know OOP, right? ;)
   }
}



class Programmer : public Human
{
   // many important things about beer, gadgets, junk food and stuff
}



class Sergey : public Programmer
{
   void MoveToCanada ();

   virtual void WasteTime ()
   {
      if (day_of_year % 256 == 0) 
         Celebrate ();
      else
         // TODO: should be call WorkHard (), fix in the next release
         Human::WasteTime ();  
   }    
}

.... somewhere in the big life loop ....

for (Human& item : all_people_heap)
{
   if (item.AreYouHappy ())
      item.WasteTime ();
   else
      item.BeHappy ();
}


Переводя вышеизложенное на обычный человеческий:
С Праздником, дорогие Программисты, Программеры и прочие сочувствующие!