class Game {
    fun addSystems(vararg system: System) {
        TODO()
    }
}

interface Component

class Position : Component
class Velocity : Component
class Sprite : Component


interface System {
    val track: List<KClass<out Component>>
}

inline fun <reified T : Component> System.track(): List<KClass<out Component>> {
    return listOf(T::class)
}

inline fun <reified T : Component, reified U: Component> System.track2(): List<KClass<out Component>> {
    return listOf(T::class, U::class)
}

abstract class AbstractSystem(vararg systems: KClass<out Component>) : System {
    override val track: List<KClass<out Component>> = systems.toList()
}

fun main() {
    class PhysicsSystem : AbstractSystem(
        Position::class,
        Velocity::class
    )

    class PositionSystem : System {
        override val track = track<Position>()
    }

    class RenderSystem : System {
        override val track = track2<Position, Sprite>()
    }


    Game().addSystems(
        PhysicsSystem(),
        RenderSystem()
    )
}