scala.annotation.switch.scala Maven / Gradle / Ivy

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/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2002-2010, 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
 *    tableswitch or
 *    lookupswitch, and issue an error if it
 *    instead compiles into a series of conditional expressions.

 *    Example:
 *  
 *   *    def fetchToken() {
 *      (ch: @switch) match {
 *        case ' ' | '\t' | CR | LF | FF =>
 *          nextChar()
 *          fetchToken()
 *        case 'A' /*..'Z'*/ | '$' | '_' | 'a' /*..'z'*/ =>
 *          putChar(ch)
 *          nextChar()
 *          getIdentRest()
 *        case ',' =>
 *          nextChar(); token = COMMA
 *        // more cases
 *      }
 *    }
 *
 *  @since 2.8
 */
final class switch extends StaticAnnotation