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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.collection.generic
import scala.collection._
/** This class represents collections that can be reduced using a - operator.
*
* @author Martin Odersky
* @owner Martin Odersky
* @version 2.8
*/
trait Subtractable[A, +This <: Subtractable[A, This]] { self =>
protected def thisCollection: This
/** Returns a new collection that contains all elements of the current collection
* except a given element.
*
* @param elem the element to remove.
*/
def -(elem: A): This
/** Returns a new collection that contains all elements of the current collection
* except a two or more given elements.
*
* @param elem1 the first element to remove.
* @param elem2 the second element to remove.
* @param elems the remaining elements to remove.
*/
def -(elem1: A, elem2: A, elems: A*): This =
this - elem1 - elem2 -- elems
/** Returns a new collection that contains all elements of the current collection
* except the elements provided by a traversable object
*
* @param elems the traversable object containing the elements that do not form part of the new collection.
*/
def --(elems: Traversable[A]): This = (thisCollection /: elems) (_ - _)
/** Returns a new collection that contains all elements of the current collection
* except the elements provided by an iterator
*
* @param elems the iterator containing the elements that do not form part of the new collection
* @note same as --
*/
def --(iter: Iterator[A]): This = (thisCollection /: iter) (_ - _)
}
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