fork download
copy 
  1. object Main extends App {
  2.   trait A {
  3.     def sample: String
  4.  
  5.     def stacked: String = "A"
  6.   }
  7.  
  8.   trait B extends A {
  9.     override def sample: String = "Implemented in B"
  10.  
  11.     override def stacked: String = super.stacked + "B"
  12.   }
  13.  
  14.   trait C extends A {
  15.     override def sample: String = "Implemented in C"
  16.  
  17.     override def stacked: String = super.stacked + "C"
  18.   }
  19.  
  20.   class D extends A with B with C
  21.  
  22.   val diamond = new D
  23.  
  24.   println(diamond.isInstanceOf[A])
  25.   println(diamond.isInstanceOf[B])
  26.   println(diamond.isInstanceOf[C])
  27.  
  28.   println(diamond.sample)
  29.  
  30.   println((new A with C with B).sample)
  31.   println((new A with B with C).sample)
  32.  
  33.   println((new A with C with B).stacked)
  34.   println((new A with B with C).stacked)
  35.   println(new A with B with C {
  36.     override def stacked: String = super[A].stacked
  37.   }.stacked)
  38.   println(new A with B with C {
  39.     override def stacked: String = super[B].stacked
  40.   }.stacked)
  41.  
  42. }
Success #stdin #stdout 0.38s 2181632KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
true
true
true
Implemented in C
Implemented in B
Implemented in C
ACB
ABC
A
AB
https://ideone.com/eSxh8e
language:
Scala (scala 2.12.8)
created:
5 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!