simplified Kotlin type safe builder example

Kotlin_Type_safe_builder.kt

// Lets say I wanted to build a Car
//                                ->  wheel
//                                ->  engine
//                                ->  body
fun main() {
    //This is possible with type Safe builders and DSL
    car {
        // this: Car
        wheel {
            // thisL Wheel
            createWheel()
        }
        engine {
            //thisL Engine
            createEngine()
        }
        body {
            //this: Body
            createBody()
        }
    }
}

fun car(carBuilder: Car.() -> Unit): Car {
    val car = Car()
    car.carBuilder()
    return car
}

class Car() {
    fun wheel(wheelBuilder: Wheel.() -> Unit) {
        val wheel = Wheel()
        wheel.wheelBuilder()

    }

    fun engine(engineBuilder: Engine.() -> Unit) {
        val engine = Engine()
        engine.engineBuilder()
    }

    fun body(bodyBuilder: Body.() -> Unit) {
        val body = Body()
        body.bodyBuilder()
    }
}

class Wheel {
    fun createWheel() {
        TODO("Not yet implemented")
    }
}

class Engine {
    fun createEngine() {
        TODO("Not yet implemented")
    }
}

class Body {
    fun createBody() {
        TODO("Not yet implemented")
    }
}