struct IVehicle {
 
   // virtual double getTankVolume() const = 0;
   // virtual double getPetrolAmount() const = 0;
   // virtual void arrive() = 0;
   // virtual int leave() = 0;
 
   virtual ~IVehicle() {};
};
 
struct IBus : IVehicle {
 
   // virtual int getPeopleCount() const = 0;
   // virtual int getMaxPeople() const = 0;
};
 
struct ITruck : IVehicle {
 
   // virtual double getCurrentLoad() const = 0;
   // virtual double getMaxLoad() const = 0;
};
 
 
class Vehicle : public IVehicle { /* .. */ };
 
class Bus: public IBus { /* ... */ };
 
class Truck : public ITruck { /* ... */ };
 
class Expeditor : public IBus, public ITruck { /* ... */ };
 
 
 
int main() {
  IVehicle* v = new Bus;
}
 

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