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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.collection
import generic._
import mutable.Builder
import TraversableView.NoBuilder
/** A base trait for non-strict views of traversable collections.
* $traversableViewInfo
*/
trait TraversableView[+A, +Coll] extends TraversableViewLike[A, Coll, TraversableView[A, Coll]] with GenTraversableView[A, Coll] { }
/** An object containing the necessary implicit definitions to make
* `TraversableView`s work. Its definitions are generally not accessed directly by clients.
*/
object TraversableView {
class NoBuilder[A] extends Builder[A, Nothing] {
def +=(elem: A): this.type = this
def iterator: Iterator[A] = Iterator.empty
def result() = throw new UnsupportedOperationException("TraversableView.Builder.result")
def clear() {}
}
type Coll = TraversableView[_, C] forSome {type C <: Traversable[_]}
implicit def canBuildFrom[A]: CanBuildFrom[Coll, A, TraversableView[A, Traversable[_]]] =
new CanBuildFrom[Coll, A, TraversableView[A, Traversable[_]]] {
def apply(from: Coll) = new NoBuilder
def apply() = new NoBuilder
}
}
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