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  1. case class Layering[+C[_]](fn: Any => C[Any]) {
  2.   def apply(x: Any): C[Any] = fn(x)
  3. }
  4.  
  5. object Layering {
  6.   val list = Layering[List](List(_))
  7.  
  8.   def compose[C[_]](layerings: Seq[Layering[C]]) =
  9.     layerings.reduce[Layering[C]] { case (l1, l2) =>
  10.       Layering[C](x => l1.fn(l2.fn(x)))
  11.     }
  12. }
  13.  
  14. object Main extends App {
  15.   import Layering._
  16.   val layerings = Seq(list, list)
  17.   println(compose(layerings)(12))
  18. }
Success #stdin #stdout 0.41s 382080KB
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List(List(12))
https://ideone.com/1fBW00
language:
Scala (scala 2.12.8)
created:
10 years ago
visibility:
public

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