Scala example source code file (variances_pos.scala)

This example Scala source code file (variances_pos.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

example, example, p, p, sls, sls, vector, vector

The Scala variances_pos.scala source code

abstract class P[+a, +b] { // SLS, Example 4.4.2
  def fst: a;
  def snd: b
}

trait Vector[+a] { // SLS, Example 4.4.3 b)
  def append[b >: a](x: Vector[b]): Vector[b]
}