Scala example source code file (LiskovTest.scala)

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

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Java - Scala tags/keywords

anyref, co1, co1_2, co2_2, contra1_2, contra2_2, liskovtest, speclite, unit

The LiskovTest.scala Scala example source code

package scalaz

object LiskovTest extends SpecLite {

  trait Co1[+ _]

  trait Contra1[- _]

  trait Co1_2[+A, B]

  trait Co2_2[A, +B]

  trait Contra1_2[-A, B]

  trait Contra2_2[A, -B]

  import Liskov._

  "apply" in {
    implicitly[String <:< AnyRef].apply(""): AnyRef
    ()
  }

  "lift" in {
    def foo[A, B](implicit ev: A <~< B) {
      Liskov.co[Co1, A, B](ev)
      Liskov.contra[Contra1, A, B](ev)

      Liskov.co2[Co1_2, B, A, Unit](ev)
      Liskov.co2_2[Co2_2, B, Unit, A](ev)
      Liskov.contra1_2[Contra1_2, B, A, Unit](ev)
      Liskov.contra2_2[Contra2_2, B, Unit, A](ev)
    }

    foo[String, AnyRef]

  }
}