RouterVisiter.kt

class RouterVisiter {
   fun route(item: TypeA){
     //route for TypeA
   }
   
   fun route(item: TypeB){
     //route for TypeB
   }
}

interface Routable {
  fun route(router: RouterVisiter)
}

class TypeA : Routable {
   override fun route(router: RouterVisiter){
     router.route(this)
   }
}

class TypeB : Routable {
   override fun route(router: RouterVisiter){
     router.route(this)
   }
}