scala.MatchError

final class MatchError extends RuntimeException

This class implements errors which are thrown whenever an object doesn’t match any pattern of a pattern matching expression.

• Source
  • MatchError.scala - Blame
  • MatchError.scala - History
• Version
  • 1.1, 05/03/2004
• Since
  • 2.0

Value Members From java.lang.Throwable

final def addSuppressed(arg0: java.lang.Throwable): Unit

• Definition Classes
  • Throwable

(defined at java.lang.Throwable)

def fillInStackTrace(): java.lang.Throwable

• Definition Classes
  • Throwable

(defined at java.lang.Throwable)

def getCause(): java.lang.Throwable

• Definition Classes
  • Throwable

(defined at java.lang.Throwable)

final def getSuppressed(): Array[java.lang.Throwable]

• Definition Classes
  • Throwable

(defined at java.lang.Throwable)

def initCause(arg0: java.lang.Throwable): java.lang.Throwable

• Definition Classes
  • Throwable

(defined at java.lang.Throwable)

def printStackTrace(arg0: PrintStream): Unit

• Definition Classes
  • Throwable

(defined at java.lang.Throwable)

def printStackTrace(arg0: PrintWriter): Unit

• Definition Classes
  • Throwable

(defined at java.lang.Throwable)

def setStackTrace(arg0: Array[StackTraceElement]): Unit

• Definition Classes
  • Throwable

(defined at java.lang.Throwable)

Instance Constructors From scala.MatchError

new MatchError(obj: Any)

(defined at scala.MatchError)

Full Source:

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



package scala

/** This class implements errors which are thrown whenever an
 *  object doesn't match any pattern of a pattern matching
 *  expression.
 *
 *  @author  Matthias Zenger
 *  @author  Martin Odersky
 *  @version 1.1, 05/03/2004
 *  @since   2.0
 */
final class MatchError(obj: Any) extends RuntimeException {
  /** There's no reason we need to call toString eagerly,
   *  so defer it until getMessage is called.
   */
  private lazy val objString = {
    def ofClass = "of class " + obj.getClass.getName
    if (obj == null) "null"
    else try {
      obj.toString() + " (" + ofClass + ")"
    } catch {
      case _: Throwable => "an instance " + ofClass
    }
  }

  override def getMessage() = objString
}