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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id: Iterable.scala 15188 2008-05-24 15:01:02Z stepancheg $
package scalax.collection.generic
/** This class represents collections that can be reduced using a -= operator.
*
* @autor Martin Odersky
* @owner Martin Odersky
* @version 2.8
*/
trait Subtractable[+C <: Subtractable[C, A], A] {
protected def thisCC: C
/** Removes a single element from this collection and returns
* either the collection itself (if it is mutable), or a new collection
* with the removed element.
*
* @param elem the element to remove.
*/
def -(elem: A): C
/** Removes two or more elements from this collection and returns
* either the collection itself (if it is mutable), or a new collection
* with the removed 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*): C =
thisCC - elem1 - elem2 -- elems.asInstanceOf[Iterable[A]] // !@!
/** Removes a number of elements provided by an iterable object
* via its <code>elements</code> method and returns
* either the collection itself (if it is mutable), or a new collection
* with the removed elements.
*
* @param iter the iterable object.
*/
def --(iter: Iterable[A]): C = (thisCC /: iter) (_ - _)
/** Removes a number of elements provided by an iterator
* via its <code>elements</code> method and returns
* either the collection itself (if it is mutable), or a new collection
* with the removed elements.
*
* @param iter the iterator
*/
def --(iter: Iterator[A]): C = (thisCC /: iter) (_ - _)
}
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