switch

final class switch extends StaticAnnotation

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 a warning 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 }

Note: for pattern matches with one or two cases, the compiler generates jump instructions. Annotating such a match with @switch does not issue any warning.

class Object
trait Matchable
class Any