Add present method on Maybe as the antithesis of unset

propensive · Dec 1, 2023 · d1b17d5 · d1b17d5
1 parent ef367e3
commit d1b17d5
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/core/maybe.scala b/src/core/maybe.scala
@@ -30,6 +30,7 @@ case class UnsetValueError() extends Error(Message("the value was not set".tt))
 
 extension [ValueType](maybe: Maybe[ValueType])
   inline def unset: Boolean = maybe == Unset
+  inline def present: Boolean = maybe != Unset
   inline def or(inline value: => ValueType): ValueType = if unset then value else maybe.asInstanceOf[ValueType]
   inline def vouch(using Unsafe): ValueType = or(throw Mistake(msg"a value was vouched but was unset"))