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Standard library for the Scala Programming Language

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/*
 * 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

/** A common supertype for companions of specializable types.
 *  Should not be extended in user code.
 */
trait Specializable

object Specializable {
  // No type parameter in @specialized annotation.
  trait SpecializedGroup { }

  // Smuggle a list of types by way of a tuple upon which Group is parameterized.
  class Group[T >: Null](value: T) extends SpecializedGroup { }

  final val Primitives  = new Group((Byte, Short, Int, Long, Char, Float, Double, Boolean, Unit))
  final val Everything  = new Group((Byte, Short, Int, Long, Char, Float, Double, Boolean, Unit, AnyRef))
  final val Bits32AndUp = new Group((Int, Long, Float, Double))
  final val Integral    = new Group((Byte, Short, Int, Long, Char))
  final val AllNumeric  = new Group((Byte, Short, Int, Long, Char, Float, Double))
  final val BestOfBreed = new Group((Int, Double, Boolean, Unit, AnyRef))
}