Scala example source code file (switch.scala)

This example Scala source code file (switch.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

annotation

The switch.scala Scala example source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2002-2013, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */
package scala.annotation

/** An annotation to be applied to a match expression.  If present,
 *  the compiler will verify that the match has been compiled to a
 *  [[http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-3.html#jvms-3.10 tableswitch or lookupswitch]]
 *  and issue an error if it instead compiles into a series of conditional expressions.
 *  Example usage:
{{{
  val Constant = 'Q'
  def tokenMe(ch: Char) = (ch: @switch) match {
    case ' ' | '\t' | '\n'  => 1
    case 'A' | 'Z' | '$'    => 2
    case '5' | Constant     => 3  // a non-literal may prevent switch generation: this would not compile
    case _                  => 4
  }
}}}
 *
 *  @author   Paul Phillips
 *  @since    2.8
 */
final class switch extends scala.annotation.StaticAnnotation