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/* NSC -- new Scala compiler
* Copyright 2005-2012 LAMP/EPFL
* @author Martin Odersky
*/
package scala.reflect
package base
/**
* Defines the type hierachy for compile-time constants.
*
* @see [[scala.reflect]] for a description on how the class hierarchy is encoded here.
*/
trait Constants {
self: Universe =>
/** The type of compile-time constants.
*/
type Constant >: Null <: AnyRef
/** A tag that preserves the identity of the `Constant` abstract type from erasure.
* Can be used for pattern matching, instance tests, serialization and likes.
*/
implicit val ConstantTag: ClassTag[Constant]
/** The constructor/deconstructor for `Constant` instances. */
val Constant: ConstantExtractor
/** An extractor class to create and pattern match with syntax `Constant(value)`
* where `value` is the Scala value of the constant.
*/
abstract class ConstantExtractor {
def apply(value: Any): Constant
def unapply(arg: Constant): Option[Any]
}
}
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