Scala example source code file (StoreTTest.scala)

This example Scala source code file (StoreTTest.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.

Learn more about this Scala project at its project page.

Java - Scala tags/keywords

cobind, comonad, equal, functor, int, speclite, storet, storettest

The StoreTTest.scala Scala example source code

package scalaz

import std.AllInstances._
import scalaz.scalacheck.ScalazProperties._
import scalaz.scalacheck.ScalazArbitrary._

object StoreTTest extends SpecLite {

  implicit def storeTuple1IntEqual = new Equal[StoreT[Tuple1, Int, Int]] {
    def equal(a1: StoreT[Tuple1, Int, Int], a2: StoreT[Tuple1, Int, Int]) = (a1.run, a2.run) match {
      case ((tf1, x1), (tf2, x2)) => Equal[Int].equal(x1, x2) && Equal[Int].equal(tf1._1(0), tf2._1(0))
    }
  }

  checkAll(comonad.laws[StoreT[Tuple1, Int, ?]])

  object instances {
    type A = Int
    def functor[F[_] : Functor] = Functor[StoreT[F, A, ?]]
    def cobind[F[_] : Cobind] = Cobind[StoreT[F, A, ?]]
    def comonad[F[_] : Comonad] = Comonad[StoreT[F, A, ?]]

    // checking absence of ambiguity
    def functor[F[_] : Comonad] = Functor[StoreT[F, A, ?]]
    def cobind[F[_] : Comonad] = Cobind[StoreT[F, A, ?]]
  }

}