class Passenger;
class Driver;
class Engine;
class Vehicle  {
  private:
std::vector<Passenger> _Passengers;
Engine _Engine;
std::shared_ptr<Driver*> _Driver;

  public:
Vehicle (const std::vector<Passenger>& passengers, std::shared_ptr<Driver*> pDriver, const Engine& engine)
:_Driver(pDriver)
,_Engine(_Engine)
,_Passengers(passengers)
{}
};