janakmshah

protocol Refuelable {
    func refuel()
}

protocol Drivable {
    func drive()
}

struct Car: Refuelable, Drivable {}

janakmshah

struct Car: Refuelable, Drivable {}
struct Motorbike: Refuelable, Rideable {}
struct CleanerCar: Refuelable, Drivable, Cleaner {}
struct MechanicRobot: VehicleFinder, Maintainer {}
struct CleanerRobot: VehicleFinder, Cleaner {}

janakmshah

protocol Refuelable {
  func refuel()
}

protocol Drivable {
  func drive()
}

protocol Rideable {
  func ride()

janakmshah

Car           = Refuelable + Drivable;
Motorbike     = Refuelable + Rideable;
CleanerCar    = Refuelable + Driveable + Cleaner;
MechanicRobot = VehicleFinder + Maintainer;
CleanerRobot  = VehicleFinder + Cleaner;

janakmshah

class Vehicle {
    func refuel()
}

class Car: Vehicle {
    func drive()
}

class CleanerCar: Car {
    func cleanVehicle() //DUPLICATE

janakmshah

class GlobalObject {
    func cleanVehicle()
}

class Vehicle: GlobalObject {
    func refuel()
}

class Car: Vehicle {
    func drive()

janakmshah

class Vehicle {
    func refuel()
}

class Car: Vehicle {
    func drive()
}

class Motorbike: Vehicle {
    func ride()

janakmshah

class Robot {
  func findVehicle()
}

class Mechanic: Robot {
  func maintainVehicle()
}

class Cleaner: Robot {
  func cleanVehicle()

janakmshah

class CleanerRobot {
  func findVehicle()
  func cleanVehicle()
}

janakmshah

class MechanicRobot {
  func findVehicle()
  func maintainVehicle()
}