scala.collection.parallel.ParSetLike.scala Maven / Gradle / Ivy

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/*
 * Scala (https://www.scala-lang.org)
 *
 * Copyright EPFL and Lightbend, Inc.
 *
 * Licensed under Apache License 2.0
 * (http://www.apache.org/licenses/LICENSE-2.0).
 *
 * See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.
 */

package scala
package collection.parallel

import scala.collection.SetLike
import scala.collection.GenSetLike
import scala.collection.GenSet
import scala.collection.Set

/** A template trait for parallel sets. This trait is mixed in with concrete
 *  parallel sets to override the representation type.
 *
 *  $sideeffects
 *
 *  @tparam T    the element type of the set
 *  @define Coll `ParSet`
 *  @define coll parallel set
 *
 *  @author Aleksandar Prokopec
 *  @since 2.9
 */
trait ParSetLike[T,
                 +Repr <: ParSetLike[T, Repr, Sequential] with ParSet[T],
                 +Sequential <: Set[T] with SetLike[T, Sequential]]
extends GenSetLike[T, Repr]
   with ParIterableLike[T, Repr, Sequential]
{ self =>

  def empty: Repr

  // note: should not override toSet (could be mutable)

  def union(that: GenSet[T]): Repr = sequentially {
    _ union that
  }

  def diff(that: GenSet[T]): Repr = sequentially {
    _ diff that
  }
}