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Make enum example serializable #1271

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Sep 12, 2022
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Make enum example serializable #1271

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10 changes: 7 additions & 3 deletions examples/src/main/scala/shapeless/examples/enum.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -49,9 +49,12 @@ object ScalaEnumDemo /*extends App*/ {
//
object ShapelessEnumDemo extends App {
// ADT as an enumeration. Barely any more boilerplate ...
sealed trait WeekDay
sealed abstract class WeekDay(val ordinal: Int) extends Serializable
object WeekDay {
val Mon, Tue, Wed, Thu, Fri, Sat, Sun = new WeekDay {}
private var ordinal = 0
val Mon, Tue, Wed, Thu, Fri, Sat, Sun =
try new WeekDay(ordinal) {}
finally ordinal += 1
val values: Set[WeekDay] = Values
}

Expand All @@ -68,7 +71,8 @@ object ShapelessEnumDemo extends App {
case _ => false // compile time non-exhaustive match warning/error without this case
}

assert(!isWeekend(Mon)) //
assert(!isWeekend(Mon))
assert(values.size == values.map(_.ordinal).size)
}

// Infrastructure for the above. Original version due to Travis Brown,
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