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Add Cogen Instance For UUID #763

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Feb 27, 2021
Merged

Add Cogen Instance For UUID #763

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3 changes: 3 additions & 0 deletions jvm/src/test/scala/org/scalacheck/CogenSpecification.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,8 @@ import ScalaVersionSpecific._
import scala.util.Try
import scala.concurrent.duration.{Duration, FiniteDuration}

import java.util.UUID

object CogenSpecification extends Properties("Cogen") {

// We need a customized definition of equality for some of our tests.
Expand Down Expand Up @@ -162,4 +164,5 @@ object CogenSpecification extends Properties("Cogen") {
include(cogenLaws[Seq[Int]], "cogenSeq.")
include(cogenLaws[Duration], "cogenDuration.")
include(cogenLaws[FiniteDuration], "cogenFiniteDuration.")
include(cogenLaws[UUID], "cogenUUID.")
}
6 changes: 6 additions & 0 deletions src/main/scala/org/scalacheck/Cogen.scala
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Expand Up @@ -15,6 +15,7 @@ import scala.collection.immutable.BitSet
import scala.util.{Failure, Success, Try}
import scala.concurrent.duration.{Duration, FiniteDuration}
import java.math.BigInteger
import java.util.UUID
import rng.Seed

sealed trait Cogen[T] extends Serializable {
Expand Down Expand Up @@ -158,6 +159,11 @@ object Cogen extends CogenArities with CogenLowPriority with CogenVersionSpecifi
implicit def cogenPartialFunction[A: Arbitrary, B: Cogen]: Cogen[PartialFunction[A, B]] =
Cogen[A => Option[B]].contramap(_.lift)

implicit val cogenUUID: Cogen[UUID] =
Cogen[(Long, Long)].contramap(value =>
(value.getLeastSignificantBits, value.getMostSignificantBits)
)

def perturbPair[A, B](seed: Seed, ab: (A, B))(implicit A: Cogen[A], B: Cogen[B]): Seed =
B.perturb(A.perturb(seed, ab._1), ab._2)

Expand Down