Scala example source code file (TypeConstraint.scala)

This example Scala source code file (TypeConstraint.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, typeconstraint

The TypeConstraint.scala Scala example source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2006-2013, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala.annotation

/** A marker for annotations that, when applied to a type, should be treated
 *  as a constraint on the annotated type.
 *
 *  A proper constraint should restrict the type based only on information
 *  mentioned within the type.  A Scala compiler can use this assumption to
 *  rewrite the contents of the constraint as necessary.  To contrast, a type
 *  annotation whose meaning depends on the context where it is written
 *  down is not a proper constrained type, and this marker should not be
 *  applied.  A Scala compiler will drop such annotations in cases where it
 *  would rewrite a type constraint.
 *
 *  @author  Lex Spoon
 *  @version 1.1, 2007-11-5
 *  @since   2.6
 */
trait TypeConstraint extends Annotation