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Standard library for the Scala Programming Language
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala
package collection
package mutable
/** A revertible history is a `History` object which supports
* an undo operation. Type variable `Evt` refers to the type
* of the published events, `Pub` denotes the publisher type.
* Type `Pub` is typically a subtype of `Publisher`.
*
* @tparam Evt type of the events
* @tparam Pub type of the publisher
*
* @author Matthias Zenger
* @version 1.0, 08/07/2003
* @since 2.8
*/
class RevertibleHistory[Evt <: Undoable, Pub] extends History[Evt, Pub] with Undoable with Serializable {
/** Rollback the full history.
*/
def undo(): Unit = {
val old = log.toList.reverse
clear()
old.foreach { case (sub, event) => event.undo() }
}
}