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  1. import scala.collection.mutable
  2.  
  3. trait Resources extends AutoCloseable {
  4.   private val resources = mutable.ListBuffer[AutoCloseable]()
  5.  
  6.   protected def resource[T <: AutoCloseable](r: T) = {
  7.     resources.prepend(r)
  8.     r
  9.   }
  10.  
  11.   override def close() =
  12.     resources.foreach(_.close())
  13. }
  14.  
  15. class Socket extends AutoCloseable {
  16.   override def close() =
  17.     println("Socket closed!")
  18. }
  19.  
  20. class Server extends Resources {
  21.   val socket = resource(new Socket())
  22.  
  23.   override def close() = {
  24.     super.close()
  25.     println("Server closed!")
  26.   }
  27. }
  28.  
  29. object Main extends App {
  30.   new Server().close()
  31. }
Success #stdin #stdout 0.4s 382144KB
comments (?)
stdin 
Standard input is empty
stdout 
Socket closed!
Server closed!
https://ideone.com/kdJ4XM
language:
Scala (scala 2.12.8)
created:
9 years ago
visibility:
public

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