cats.kernel.Comparison.scala Maven / Gradle / Ivy
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package cats.kernel
/** ADT encoding the possible results of a comparison */
sealed abstract class Comparison(val toInt: Int, val toDouble: Double) extends Product with Serializable
object Comparison {
final case object GreaterThan extends Comparison(1, 1.0)
final case object EqualTo extends Comparison(0, 0.0)
final case object LessThan extends Comparison(-1, -1.0)
// Used for fromDouble
private val SomeGt = Some(Comparison.GreaterThan)
private val SomeEq = Some(Comparison.EqualTo)
private val SomeLt = Some(Comparison.LessThan)
def fromInt(int: Int): Comparison =
if (int > 0) Comparison.GreaterThan
else if (int == 0) Comparison.EqualTo
else Comparison.LessThan // scalastyle:ignore ensure.single.space.after.token
def fromDouble(double: Double): Option[Comparison] =
if (double.isNaN) None
else if (double > 0.0) SomeGt
else if (double == 0.0) SomeEq
else SomeLt
implicit val catsKernelEqForComparison: Eq[Comparison] = Eq.fromUniversalEquals
}