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Reflection Library for the Scala Programming Language
/*
* Scala (https://www.scala-lang.org)
*
* Copyright EPFL and Lightbend, Inc.
*
* Licensed under Apache License 2.0
* (http://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package scala
package reflect.internal.util
/** A simple three value type for booleans with an unknown value */
object ThreeValues {
type ThreeValue = Byte
final val YES = 1
final val NO = -1
final val UNKNOWN = 0
def fromBoolean(b: Boolean): ThreeValue = if (b) YES else NO
def toBoolean(x: ThreeValue): Boolean = x == YES
}