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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 added to other
* collections using a '+' operator.
*
* @author Martin Odersky
* @owner Martin Odersky
* @version 2.8
*/
trait Addable[A, +This <: Addable[A, This]] { self =>
protected def thisCollection: This
/** Creates a new collection with an additional element, unless the element is already present.
* @param elem the element to be added
* @return a fresh collection
*/
def +(elem: A): This
/** Adds two or more elements to this collection and returns
* a new collection.
*
* @param elem1 the first element to add.
* @param elem2 the second element to add.
* @param elems the remaining elements to add.
*/
def + (elem1: A, elem2: A, elems: A*): This =
this + elem1 + elem2 ++ elems
/** Adds a number of elements provided by a traversable object
* and returns a new collection with the added elements.
*
* @param elems the traversable object.
*/
def ++ (elems: Traversable[A]): This = (thisCollection /: elems) (_ + _)
/** Adds a number of elements provided by an iterator
* and returns a new collection with the added elements.
*
* @param iter the iterator
*/
def ++ (iter: Iterator[A]): This = (thisCollection /: iter) (_ + _)
}
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