Scala example source code file (LazyBuilder.scala)

This example Scala source code file (LazyBuilder.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

builder, elem, lazybuilder, list, listbuffer, to, traversableonce

The LazyBuilder.scala Scala example source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2013, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala
package collection
package mutable

/** A builder that constructs its result lazily. Iterators or iterables to
 *  be added to this builder with `++=` are not evaluated until `result` is called.
 *
 *  @since 2.8
 *
 *  @tparam Elem    type of the elements for this builder.
 *  @tparam To      type of the collection this builder builds.
 */
abstract class LazyBuilder[Elem, +To] extends Builder[Elem, To] {
  /** The different segments of elements to be added to the builder, represented as iterators */
  protected var parts = new ListBuffer[TraversableOnce[Elem]]
  def +=(x: Elem): this.type = { parts += List(x); this }
  override def ++=(xs: TraversableOnce[Elem]): this.type = { parts += xs ; this }
  def result(): To
  def clear() { parts.clear() }
}