scala.collection.parallel.immutable

ParRange

class ParRange extends ParSeq[Int] with Serializable

Parallel ranges.

This is a base trait for Scala parallel collections. It defines behaviour common to all parallel collections. Concrete parallel collections should inherit this trait and ParIterable if they want to define specific combiner factories.

Parallel operations are implemented with divide and conquer style algorithms that parallelize well. The basic idea is to split the collection into smaller parts until they are small enough to be operated on sequentially.

All of the parallel operations are implemented as tasks within this trait. Tasks rely on the concept of splitters, which extend iterators. Every parallel collection defines:

def splitter: IterableSplitter[T]

which returns an instance of IterableSplitter[T], which is a subtype of Splitter[T]. Splitters have a method remaining to check the remaining number of elements, and method split which is defined by splitters. Method split divides the splitters iterate over into disjunct subsets:

def split: Seq[Splitter]

which splits the splitter into a sequence of disjunct subsplitters. This is typically a very fast operation which simply creates wrappers around the receiver collection. This can be repeated recursively.

Tasks are scheduled for execution through a scala.collection.parallel.TaskSupport object, which can be changed through the tasksupport setter of the collection.

Method newCombiner produces a new combiner. Combiners are an extension of builders. They provide a method combine which combines two combiners and returns a combiner containing elements of both combiners. This method can be implemented by aggressively copying all the elements into the new combiner or by lazily binding their results. It is recommended to avoid copying all of the elements for performance reasons, although that cost might be negligible depending on the use case. Standard parallel collection combiners avoid copying when merging results, relying either on a two-step lazy construction or specific data-structure properties.

Methods:

def seq: Sequential
def par: Repr

produce the sequential or parallel implementation of the collection, respectively. Method par just returns a reference to this parallel collection. Method seq is efficient - it will not copy the elements. Instead, it will create a sequential version of the collection using the same underlying data structure. Note that this is not the case for sequential collections in general - they may copy the elements and produce a different underlying data structure.

The combination of methods toMap, toSeq or toSet along with par and seq is a flexible way to change between different collection types.

Since this trait extends the GenIterable trait, methods like size must also be implemented in concrete collections, while iterator forwards to splitter by default.

Each parallel collection is bound to a specific fork/join pool, on which dormant worker threads are kept. The fork/join pool contains other information such as the parallelism level, that is, the number of processors used. When a collection is created, it is assigned the default fork/join pool found in the scala.parallel package object.

Parallel collections are not necessarily ordered in terms of the foreach operation (see Traversable). Parallel sequences have a well defined order for iterators - creating an iterator and traversing the elements linearly will always yield the same order. However, bulk operations such as foreach, map or filter always occur in undefined orders for all parallel collections.

Existing parallel collection implementations provide strict parallel iterators. Strict parallel iterators are aware of the number of elements they have yet to traverse. It's also possible to provide non-strict parallel iterators, which do not know the number of elements remaining. To do this, the new collection implementation must override isStrictSplitterCollection to false. This will make some operations unavailable.

To create a new parallel collection, extend the ParIterable trait, and implement size, splitter, newCombiner and seq. Having an implicit combiner factory requires extending this trait in addition, as well as providing a companion object, as with regular collections.

Method size is implemented as a constant time operation for parallel collections, and parallel collection operations rely on this assumption.

The higher-order functions passed to certain operations may contain side-effects. Since implementations of bulk operations may not be sequential, this means that side-effects may not be predictable and may produce data-races, deadlocks or invalidation of state if care is not taken. It is up to the programmer to either avoid using side-effects or to use some form of synchronization when accessing mutable data.

Self Type
ParRange
Annotations
@SerialVersionUID( uid = 1L )
Source
ParRange.scala
Since

2.9

See also

Scala's Parallel Collections Library overview section on ParRange for more information.

Linear Supertypes
Serializable, java.io.Serializable, ParSeq[Int], ParIterable[Int], Immutable, parallel.ParSeq[Int], ParSeqLike[Int, ParSeq[Int], immutable.Seq[Int]], parallel.ParIterable[Int], ParIterableLike[Int, ParSeq[Int], immutable.Seq[Int]], Parallel, CustomParallelizable[Int, ParSeq[Int]], GenericParTemplate[Int, ParSeq], HasNewCombiner[Int, scala.collection.parallel.immutable.ParSeq[Int] @scala.annotation.unchecked.uncheckedVariance], GenSeq[Int], GenIterable[Int], GenTraversable[Int], GenericTraversableTemplate[Int, ParSeq], HasNewBuilder[Int, scala.collection.parallel.immutable.ParSeq[Int] @scala.annotation.unchecked.uncheckedVariance], GenSeqLike[Int, ParSeq[Int]], Equals, GenIterableLike[Int, ParSeq[Int]], GenTraversableLike[Int, ParSeq[Int]], Parallelizable[Int, ParSeq[Int]], GenTraversableOnce[Int], AnyRef, Any
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  8. ParSeqLike
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  11. Parallel
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  15. GenSeq
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  19. HasNewBuilder
  20. GenSeqLike
  21. Equals
  22. GenIterableLike
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  24. Parallelizable
  25. GenTraversableOnce
  26. AnyRef
  27. Any
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Instance Constructors

  1. new ParRange(range: immutable.Range)

    range

    the sequential range this parallel range was obtained from

Type Members

  1. trait Accessor[R, Tp] extends ParSeqLike.Accessor[R, Tp]

    Standard accessor task that iterates over the elements of the collection.

  2. class Aggregate[S] extends Accessor[S, Aggregate[S]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  3. trait BuilderOps[Elem, To] extends AnyRef

    Definition Classes
    ParIterableLike
  4. class Collect[S, That] extends Transformer[Combiner[S, That], Collect[S, That]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  5. abstract class Composite[FR, SR, R, First <: StrictSplitterCheckTask[FR, _], Second <: StrictSplitterCheckTask[SR, _]] extends NonDivisibleTask[R, Composite[FR, SR, R, First, Second]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  6. class Copy[U >: T, That] extends Transformer[Combiner[U, That], Copy[U, That]]

    Attributes
    protected
    Definition Classes
    ParIterableLike
  7. class CopyToArray[U >: T, This >: Repr] extends Accessor[Unit, CopyToArray[U, This]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  8. class Corresponds[S] extends Accessor[Boolean, Corresponds[S]]

    Attributes
    protected[this]
    Definition Classes
    ParSeqLike
  9. class Count extends Accessor[Int, Count]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  10. class CreateScanTree[U >: T] extends Transformer[ScanTree[U], CreateScanTree[U]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  11. class Drop[U >: T, This >: Repr] extends Transformer[Combiner[U, This], Drop[U, This]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  12. abstract class Elements extends SeqSplitter[T] with scala.BufferedIterator[T]

    Used to iterate elements using indices

  13. class Exists extends Accessor[Boolean, Exists]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  14. class Filter[U >: T, This >: Repr] extends Transformer[Combiner[U, This], Filter[U, This]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  15. class FilterNot[U >: T, This >: Repr] extends Transformer[Combiner[U, This], FilterNot[U, This]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  16. class Find[U >: T] extends Accessor[Option[U], Find[U]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  17. class FlatMap[S, That] extends Transformer[Combiner[S, That], FlatMap[S, That]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  18. class Fold[U >: T] extends Accessor[U, Fold[U]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  19. class Forall extends Accessor[Boolean, Forall]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  20. class Foreach[S] extends Accessor[Unit, Foreach[S]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  21. class FromScanTree[U >: T, That] extends StrictSplitterCheckTask[Combiner[U, That], FromScanTree[U, That]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  22. class GroupBy[K, U >: T] extends Transformer[HashMapCombiner[K, U], GroupBy[K, U]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  23. class IndexWhere extends Accessor[Int, IndexWhere]

    Attributes
    protected[this]
    Definition Classes
    ParSeqLike
  24. class LastIndexWhere extends Accessor[Int, LastIndexWhere]

    Attributes
    protected[this]
    Definition Classes
    ParSeqLike
  25. class Map[S, That] extends Transformer[Combiner[S, That], Map[S, That]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  26. class Max[U >: T] extends Accessor[Option[U], Max[U]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  27. class Min[U >: T] extends Accessor[Option[U], Min[U]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  28. trait NonDivisible[R] extends NonDivisibleTask[R, NonDivisible[R]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  29. trait NonDivisibleTask[R, Tp] extends StrictSplitterCheckTask[R, Tp]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  30. abstract class ParComposite[FR, SR, R, First <: StrictSplitterCheckTask[FR, _], Second <: StrictSplitterCheckTask[SR, _]] extends Composite[FR, SR, R, First, Second]

    Performs two tasks in parallel, and waits for both to finish.

  31. class ParRangeIterator extends SeqSplitter[Int]

  32. class Partition[U >: T, This >: Repr] extends Transformer[(Combiner[U, This], Combiner[U, This]), Partition[U, This]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  33. class Product[U >: T] extends Accessor[U, Product[U]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  34. class Reduce[U >: T] extends Accessor[Option[U], Reduce[U]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  35. abstract class ResultMapping[R, Tp, R1] extends NonDivisibleTask[R1, ResultMapping[R, Tp, R1]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  36. class Reverse[U >: T, This >: Repr] extends Transformer[Combiner[U, This], Reverse[U, This]]

    Attributes
    protected[this]
    Definition Classes
    ParSeqLike
  37. class ReverseMap[S, That] extends Transformer[Combiner[S, That], ReverseMap[S, That]]

    Attributes
    protected[this]
    Definition Classes
    ParSeqLike
  38. type SSCTask[R, Tp] = StrictSplitterCheckTask[R, Tp]

    Definition Classes
    ParIterableLike
  39. class SameElements[U >: T] extends Accessor[Boolean, SameElements[U]]

    Attributes
    protected[this]
    Definition Classes
    ParSeqLike
  40. case class ScanLeaf[U >: T](pit: IterableSplitter[U], op: (U, U) ⇒ U, from: Int, len: Int, prev: Option[ScanLeaf[U]], acc: U) extends ScanTree[U] with scala.Product with Serializable

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  41. case class ScanNode[U >: T](left: ScanTree[U], right: ScanTree[U]) extends ScanTree[U] with scala.Product with Serializable

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  42. trait ScanTree[U >: T] extends AnyRef

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  43. class SegmentLength extends Accessor[(Int, Boolean), SegmentLength]

    Attributes
    protected[this]
    Definition Classes
    ParSeqLike
  44. abstract class SeqComposite[FR, SR, R, First <: StrictSplitterCheckTask[FR, _], Second <: StrictSplitterCheckTask[SR, _]] extends Composite[FR, SR, R, First, Second]

    Sequentially performs one task after another.

  45. trait SignallingOps[PI <: DelegatedSignalling] extends AnyRef

    Definition Classes
    ParIterableLike
  46. class Slice[U >: T, This >: Repr] extends Transformer[Combiner[U, This], Slice[U, This]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  47. class Span[U >: T, This >: Repr] extends Transformer[(Combiner[U, This], Combiner[U, This]), Span[U, This]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  48. class SplitAt[U >: T, This >: Repr] extends Transformer[(Combiner[U, This], Combiner[U, This]), SplitAt[U, This]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  49. trait StrictSplitterCheckTask[R, Tp] extends Task[R, Tp]

    Attributes
    protected
    Definition Classes
    ParIterableLike
  50. class Sum[U >: T] extends Accessor[U, Sum[U]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  51. type SuperParIterator = IterableSplitter[Int]

    Definition Classes
    ParSeqLike
  52. class Take[U >: T, This >: Repr] extends Transformer[Combiner[U, This], Take[U, This]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  53. class TakeWhile[U >: T, This >: Repr] extends Transformer[(Combiner[U, This], Boolean), TakeWhile[U, This]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  54. trait TaskOps[R, Tp] extends AnyRef

    Definition Classes
    ParIterableLike
  55. class ToParCollection[U >: T, That] extends Transformer[Combiner[U, That], ToParCollection[U, That]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  56. class ToParMap[K, V, That] extends Transformer[Combiner[(K, V), That], ToParMap[K, V, That]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  57. trait Transformer[R, Tp] extends Accessor[R, Tp] with ParSeqLike.Transformer[R, Tp]

    Attributes
    protected
    Definition Classes
    ParSeqLikeParIterableLike
  58. class Updated[U >: T, That] extends Transformer[Combiner[U, That], Updated[U, That]]

    Attributes
    protected[this]
    Definition Classes
    ParSeqLike
  59. class Zip[U >: T, S, That] extends Transformer[Combiner[(U, S), That], Zip[U, S, That]]

    Attributes
    protected[this]
    Definition Classes
    ParSeqLikeParIterableLike
  60. class ZipAll[U >: T, S, That] extends Transformer[Combiner[(U, S), That], ZipAll[U, S, That]]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike

Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  2. final def !=(arg0: Any): Boolean

    Test two objects for inequality.

    Test two objects for inequality.

    returns

    true if !(this == that), false otherwise.

    Definition Classes
    Any
  3. final def ##(): Int

    Equivalent to x.hashCode except for boxed numeric types and null.

    Equivalent to x.hashCode except for boxed numeric types and null. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For null returns a hashcode where null.hashCode throws a NullPointerException.

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  4. def +(other: String): String

    Implicit information
    This member is added by an implicit conversion from ParRange to StringAdd performed by method any2stringadd in scala.Predef.
    Definition Classes
    StringAdd
  5. def ++[B](that: GenTraversableOnce[B]): ParRange[B]

    [use case] Returns a new immutable parallel range containing the elements from the left hand operand followed by the elements from the right hand operand.

    [use case]

    Returns a new immutable parallel range containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the immutable parallel range is the most specific superclass encompassing the element types of the two operands.

    Example:

    scala> val a = LinkedList(1)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1)
    
    scala> val b = LinkedList(2)
    b: scala.collection.mutable.LinkedList[Int] = LinkedList(2)
    
    scala> val c = a ++ b
    c: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)
    
    scala> val d = LinkedList('a')
    d: scala.collection.mutable.LinkedList[Char] = LinkedList(a)
    
    scala> val e = c ++ d
    e: scala.collection.mutable.LinkedList[AnyVal] = LinkedList(1, 2, a)
    B

    the element type of the returned collection.

    that

    the traversable to append.

    returns

    a new immutable parallel range which contains all elements of this immutable parallel range followed by all elements of that.

    Definition Classes
    ParIterableLikeGenTraversableLike
    Full Signature

    def ++[U >: Int, That](that: GenTraversableOnce[U])(implicit bf: CanBuildFrom[ParSeq[Int], U, That]): That

  6. def +:(elem: A): ParRange[A]

    [use case] A copy of the immutable parallel range with an element prepended.

    [use case]

    A copy of the immutable parallel range with an element prepended.

    Note that :-ending operators are right associative (see example). A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.

    Also, the original immutable parallel range is not modified, so you will want to capture the result.

    Example:

    scala> val x = LinkedList(1)
    x: scala.collection.mutable.LinkedList[Int] = LinkedList(1)
    
    scala> val y = 2 +: x
    y: scala.collection.mutable.LinkedList[Int] = LinkedList(2, 1)
    
    scala> println(x)
    LinkedList(1)
    elem

    the prepended element

    returns

    a new immutable parallel range consisting of elem followed by all elements of this immutable parallel range.

    Definition Classes
    ParSeqLikeGenSeqLike
    Full Signature

    def +:[U >: Int, That](elem: U)(implicit bf: CanBuildFrom[ParSeq[Int], U, That]): That

  7. def ->[B](y: B): (ParRange, B)

    Implicit information
    This member is added by an implicit conversion from ParRange to ArrowAssoc[ParRange] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  8. def /:[S](z: S)(op: (S, Int) ⇒ S): S

    Applies a binary operator to a start value and all elements of this immutable parallel range, going left to right.

    Applies a binary operator to a start value and all elements of this immutable parallel range, going left to right.

    Note: /: is alternate syntax for foldLeft; z /: xs is the same as xs foldLeft z.

    Examples:

    Note that the folding function used to compute b is equivalent to that used to compute c.

    scala> val a = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = (5 /: a)(_+_)
    b: Int = 15
    
    scala> val c = (5 /: a)((x,y) => x + y)
    c: Int = 15

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    z

    the start value.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this immutable parallel range, going left to right with the start value z on the left:

    op(...op(op(z, x_1), x_2), ..., x_n)

    where x1, ..., xn are the elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  9. def :+(elem: A): ParRange[A]

    [use case] A copy of this immutable parallel range with an element appended.

    [use case]

    A copy of this immutable parallel range with an element appended.

    A mnemonic for +: vs. :+ is: the COLon goes on the COLlection side.

    Note: will not terminate for infinite-sized collections.

    Example:

    scala> import scala.collection.mutable.LinkedList
    import scala.collection.mutable.LinkedList
    
    scala> val a = LinkedList(1)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1)
    
    scala> val b = a :+ 2
    b: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)
    
    scala> println(a)
    LinkedList(1)
    elem

    the appended element

    returns

    a new immutable parallel range consisting of all elements of this immutable parallel range followed by elem.

    Definition Classes
    ParSeqLikeGenSeqLike
    Full Signature

    def :+[U >: Int, That](elem: U)(implicit bf: CanBuildFrom[ParSeq[Int], U, That]): That

  10. def :\[S](z: S)(op: (Int, S) ⇒ S): S

    Applies a binary operator to all elements of this immutable parallel range and a start value, going right to left.

    Applies a binary operator to all elements of this immutable parallel range and a start value, going right to left.

    Note: :\ is alternate syntax for foldRight; xs :\ z is the same as xs foldRight z.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    Examples:

    Note that the folding function used to compute b is equivalent to that used to compute c.

    scala> val a = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = (a :\ 5)(_+_)
    b: Int = 15
    
    scala> val c = (a :\ 5)((x,y) => x + y)
    c: Int = 15
    z

    the start value

    op

    the binary operator

    returns

    the result of inserting op between consecutive elements of this immutable parallel range, going right to left with the start value z on the right:

    op(x_1, op(x_2, ... op(x_n, z)...))

    where x1, ..., xn are the elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  11. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  12. final def ==(arg0: Any): Boolean

    Test two objects for equality.

    Test two objects for equality. The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    Any
  13. def aggregate[S](z: S)(seqop: (S, Int) ⇒ S, combop: (S, S) ⇒ S): S

    Aggregates the results of applying an operator to subsequent elements.

    Aggregates the results of applying an operator to subsequent elements.

    This is a more general form of fold and reduce. It has similar semantics, but does not require the result to be a supertype of the element type. It traverses the elements in different partitions sequentially, using seqop to update the result, and then applies combop to results from different partitions. The implementation of this operation may operate on an arbitrary number of collection partitions, so combop may be invoked arbitrary number of times.

    For example, one might want to process some elements and then produce a Set. In this case, seqop would process an element and append it to the list, while combop would concatenate two lists from different partitions together. The initial value z would be an empty set.

    pc.aggregate(Set[Int]())(_ += process(_), _ ++ _)

    Another example is calculating geometric mean from a collection of doubles (one would typically require big doubles for this).

    S

    the type of accumulated results

    z

    the initial value for the accumulated result of the partition - this will typically be the neutral element for the seqop operator (e.g. Nil for list concatenation or 0 for summation)

    seqop

    an operator used to accumulate results within a partition

    combop

    an associative operator used to combine results from different partitions

    Definition Classes
    ParIterableLikeGenTraversableOnce
  14. final def apply(idx: Int): Int

    Selects an element by its index in the immutable parallel range.

    Selects an element by its index in the immutable parallel range.

    Example:

    scala> val x = LinkedList(1, 2, 3, 4, 5)
    x: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4, 5)
    
    scala> x(3)
    res1: Int = 4
    idx

    The index to select.

    returns

    the element of this immutable parallel range at index idx, where 0 indicates the first element.

    Definition Classes
    ParRangeParSeqGenSeqLike
    Annotations
    @inline()
    Exceptions thrown
    `IndexOutOfBoundsException`

    if idx does not satisfy 0 <= idx < length.

  15. final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown
    ClassCastException

    if the receiver object is not an instance of the erasure of type T0.

  16. def asParIterable: parallel.ParIterable[Int]

    Implicit information
    This member is added by an implicit conversion from ParRange to TraversableOps[Int] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  17. def asParSeq: parallel.ParSeq[Int]

    Implicit information
    This member is added by an implicit conversion from ParRange to TraversableOps[Int] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  18. def bf2seq[S, That](bf: CanBuildFrom[ParSeq[Int], S, That]): CanBuildFrom[immutable.Seq[Int], S, That]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  19. implicit def builder2ops[Elem, To](cb: Builder[Elem, To]): BuilderOps[Elem, To]

    Attributes
    protected
    Definition Classes
    ParIterableLike
  20. def canEqual(other: Any): Boolean

    Definition Classes
    ParIterableLike
  21. def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
    Note

    not specified by SLS as a member of AnyRef

  22. def collect[B](pf: PartialFunction[A, B]): ParRange[B]

    [use case] Builds a new collection by applying a partial function to all elements of this immutable parallel range on which the function is defined.

    [use case]

    Builds a new collection by applying a partial function to all elements of this immutable parallel range on which the function is defined.

    B

    the element type of the returned collection.

    pf

    the partial function which filters and maps the immutable parallel range.

    returns

    a new immutable parallel range resulting from applying the given partial function pf to each element on which it is defined and collecting the results. The order of the elements is preserved.

    Definition Classes
    ParIterableLikeGenTraversableLike
    Full Signature

    def collect[S, That](pf: PartialFunction[Int, S])(implicit bf: CanBuildFrom[ParSeq[Int], S, That]): That

  23. def combinerFactory[S, That](cbf: () ⇒ Combiner[S, That]): CombinerFactory[S, That]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  24. def combinerFactory: CombinerFactory[Int, ParSeq[Int]]

    Creates a combiner factory.

    Creates a combiner factory. Each combiner factory instance is used once per invocation of a parallel transformer method for a single collection.

    The default combiner factory creates a new combiner every time it is requested, unless the combiner is thread-safe as indicated by its canBeShared method. In this case, the method returns a factory which returns the same combiner each time. This is typically done for concurrent parallel collections, the combiners of which allow thread safe access.

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  25. def companion: GenericCompanion[ParSeq] with GenericParCompanion[ParSeq]

    The factory companion object that builds instances of class immutable.ParRange.

    The factory companion object that builds instances of class immutable.ParRange. (or its Iterable superclass where class immutable.ParRange is not a Seq.)

    Definition Classes
    ParSeqParIterableParSeqParIterableGenericParTemplateGenSeqGenIterableGenTraversableGenericTraversableTemplate
  26. def copyToArray[U >: Int](xs: Array[U], start: Int, len: Int): Unit

    Definition Classes
    ParIterableLikeGenTraversableOnce
  27. def copyToArray(xs: Array[A], start: Int): Unit

    [use case] Copies values of this immutable parallel range to an array.

    [use case]

    Copies values of this immutable parallel range to an array. Fills the given array xs with values of this immutable parallel range, beginning at index start. Copying will stop once either the end of the current immutable parallel range is reached, or the end of the array is reached.

    Note: will not terminate for infinite-sized collections.

    xs

    the array to fill.

    start

    the starting index.

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Full Signature

    def copyToArray[U >: Int](xs: Array[U], start: Int): Unit

  28. def copyToArray(xs: Array[A]): Unit

    [use case] Copies values of this immutable parallel range to an array.

    [use case]

    Copies values of this immutable parallel range to an array. Fills the given array xs with values of this immutable parallel range. Copying will stop once either the end of the current immutable parallel range is reached, or the end of the array is reached.

    Note: will not terminate for infinite-sized collections.

    xs

    the array to fill.

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Full Signature

    def copyToArray[U >: Int](xs: Array[U]): Unit

  29. def corresponds[S](that: GenSeq[S])(p: (Int, S) ⇒ Boolean): Boolean

    Tests whether every element of this immutable parallel range relates to the corresponding element of another parallel sequence by satisfying a test predicate.

    Tests whether every element of this immutable parallel range relates to the corresponding element of another parallel sequence by satisfying a test predicate.

    This method will use abort signalling capabilities. This means that splitters may send and read abort signals.

    S

    the type of the elements of that

    that

    the other parallel sequence

    p

    the test predicate, which relates elements from both sequences

    returns

    true if both parallel sequences have the same length and p(x, y) is true for all corresponding elements x of this immutable parallel range and y of that, otherwise false

    Definition Classes
    ParSeqLikeGenSeqLike
  30. def count(p: (Int) ⇒ Boolean): Int

    Counts the number of elements in the immutable parallel range which satisfy a predicate.

    Counts the number of elements in the immutable parallel range which satisfy a predicate.

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  31. def debugBuffer: ArrayBuffer[String]

    Definition Classes
    ParIterableLike
  32. implicit def delegatedSignalling2ops[PI <: DelegatedSignalling](it: PI): SignallingOps[PI]

    Attributes
    protected
    Definition Classes
    ParIterableLike
  33. def diff(that: GenSeq[A]): ParRange[A]

    [use case] Computes the multiset difference between this immutable parallel range and another sequence.

    [use case]

    Computes the multiset difference between this immutable parallel range and another sequence.

    Note: will not terminate for infinite-sized collections.

    that

    the sequence of elements to remove

    returns

    a new immutable parallel range which contains all elements of this immutable parallel range except some of occurrences of elements that also appear in that. If an element value x appears n times in that, then the first n occurrences of x will not form part of the result, but any following occurrences will.

    Definition Classes
    ParSeqLikeGenSeqLike
    Full Signature

    def diff[U >: Int](that: GenSeq[U]): ParSeq[Int]

  34. def distinct: ParSeq[Int]

    Builds a new immutable parallel range from this immutable parallel range without any duplicate elements.

    Builds a new immutable parallel range from this immutable parallel range without any duplicate elements.

    Note: will not terminate for infinite-sized collections.

    returns

    A new immutable parallel range which contains the first occurrence of every element of this immutable parallel range.

    Definition Classes
    ParSeqLikeGenSeqLike
  35. def down(p: IterableSplitter[_]): SeqSplitter[Int]

    Attributes
    protected[this]
    Definition Classes
    ParSeqLike
  36. def drop(n: Int): ParSeq[Int]

    Selects all elements except first n ones.

    Selects all elements except first n ones.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    n

    the number of elements to drop from this immutable parallel range.

    returns

    a immutable parallel range consisting of all elements of this immutable parallel range except the first n ones, or else the empty immutable parallel range, if this immutable parallel range has less than n elements.

    Definition Classes
    ParIterableLikeGenTraversableLike
  37. def dropWhile(pred: (Int) ⇒ Boolean): ParSeq[Int]

    Drops all elements in the longest prefix of elements that satisfy the predicate, and returns a collection composed of the remaining elements.

    Drops all elements in the longest prefix of elements that satisfy the predicate, and returns a collection composed of the remaining elements.

    This method will use indexFlag signalling capabilities. This means that splitters may set and read the indexFlag state. The index flag is initially set to maximum integer value.

    pred

    the predicate used to test the elements

    returns

    a collection composed of all the elements after the longest prefix of elements in this immutable parallel range that satisfy the predicate pred

    Definition Classes
    ParIterableLikeGenTraversableLike
  38. def endsWith[S](that: GenSeq[S]): Boolean

    Tests whether this immutable parallel range ends with the given parallel sequence.

    Tests whether this immutable parallel range ends with the given parallel sequence.

    This method will use abort signalling capabilities. This means that splitters may send and read abort signals.

    S

    the type of the elements of that sequence

    that

    the sequence to test

    returns

    true if this immutable parallel range has that as a suffix, false otherwise

    Definition Classes
    ParSeqLikeGenSeqLike
  39. def ensuring(cond: (ParRange) ⇒ Boolean, msg: ⇒ Any): ParRange

    Implicit information
    This member is added by an implicit conversion from ParRange to Ensuring[ParRange] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  40. def ensuring(cond: (ParRange) ⇒ Boolean): ParRange

    Implicit information
    This member is added by an implicit conversion from ParRange to Ensuring[ParRange] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  41. def ensuring(cond: Boolean, msg: ⇒ Any): ParRange

    Implicit information
    This member is added by an implicit conversion from ParRange to Ensuring[ParRange] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  42. def ensuring(cond: Boolean): ParRange

    Implicit information
    This member is added by an implicit conversion from ParRange to Ensuring[ParRange] performed by method any2Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  43. final def eq(arg0: AnyRef): Boolean

    Tests whether the argument (arg0) is a reference to the receiver object (this).

    Tests whether the argument (arg0) is a reference to the receiver object (this).

    The eq method implements an equivalence relation on non-null instances of AnyRef, and has three additional properties:

    • It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
    • For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
    • null.eq(null) returns true.

    When overriding the equals or hashCode methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).

    returns

    true if the argument is a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  44. def equals(that: Any): Boolean

    The equals method for arbitrary sequences.

    The equals method for arbitrary sequences. Compares this sequence to some other object.

    that

    The object to compare the sequence to

    returns

    true if that is a sequence that has the same elements as this sequence in the same order, false otherwise

    Definition Classes
    GenSeqLikeEqualsAny
  45. def exists(pred: (Int) ⇒ Boolean): Boolean

    Tests whether a predicate holds for some element of this immutable parallel range.

    Tests whether a predicate holds for some element of this immutable parallel range.

    This method will use abort signalling capabilities. This means that splitters may send and read abort signals.

    pred

    a predicate used to test elements

    returns

    true if p holds for some element, false otherwise

    Definition Classes
    ParIterableLikeGenTraversableOnce
  46. def filter(pred: (Int) ⇒ Boolean): ParSeq[Int]

    Selects all elements of this immutable parallel range which satisfy a predicate.

    Selects all elements of this immutable parallel range which satisfy a predicate.

    pred

    the predicate used to test elements.

    returns

    a new immutable parallel range consisting of all elements of this immutable parallel range that satisfy the given predicate p. Their order may not be preserved.

    Definition Classes
    ParIterableLikeGenTraversableLike
  47. def filterNot(pred: (Int) ⇒ Boolean): ParSeq[Int]

    Selects all elements of this immutable parallel range which do not satisfy a predicate.

    Selects all elements of this immutable parallel range which do not satisfy a predicate.

    pred

    the predicate used to test elements.

    returns

    a new immutable parallel range consisting of all elements of this immutable parallel range that do not satisfy the given predicate p. Their order may not be preserved.

    Definition Classes
    ParIterableLikeGenTraversableLike
  48. def finalize(): Unit

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the finalize method is invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent.

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
    Note

    not specified by SLS as a member of AnyRef

  49. def find(pred: (Int) ⇒ Boolean): Option[Int]

    Finds some element in the collection for which the predicate holds, if such an element exists.

    Finds some element in the collection for which the predicate holds, if such an element exists. The element may not necessarily be the first such element in the iteration order.

    If there are multiple elements obeying the predicate, the choice is nondeterministic.

    This method will use abort signalling capabilities. This means that splitters may send and read abort signals.

    pred

    predicate used to test the elements

    returns

    an option value with the element if such an element exists, or None otherwise

    Definition Classes
    ParIterableLikeGenTraversableOnce
  50. def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): ParRange[B]

    [use case] Builds a new collection by applying a function to all elements of this immutable parallel range and using the elements of the resulting collections.

    [use case]

    Builds a new collection by applying a function to all elements of this immutable parallel range and using the elements of the resulting collections.

    For example:

    def getWords(lines: Seq[String]): Seq[String] = lines flatMap (line => line split "\\W+")

    The type of the resulting collection is guided by the static type of immutable parallel range. This might cause unexpected results sometimes. For example:

    // lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set
    def lettersOf(words: Seq[String]) = words flatMap (word => word.toSet)
    
    // lettersOf will return a Set[Char], not a Seq
    def lettersOf(words: Seq[String]) = words.toSet flatMap (word => word.toSeq)
    
    // xs will be a an Iterable[Int]
    val xs = Map("a" -> List(11,111), "b" -> List(22,222)).flatMap(_._2)
    
    // ys will be a Map[Int, Int]
    val ys = Map("a" -> List(1 -> 11,1 -> 111), "b" -> List(2 -> 22,2 -> 222)).flatMap(_._2)
    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

    a new immutable parallel range resulting from applying the given collection-valued function f to each element of this immutable parallel range and concatenating the results.

    Definition Classes
    ParIterableLikeGenTraversableLike
    Full Signature

    def flatMap[S, That](f: (Int) ⇒ GenTraversableOnce[S])(implicit bf: CanBuildFrom[ParSeq[Int], S, That]): That

  51. def flatten[B]: ParRange[B]

    [use case] Converts this immutable parallel range of traversable collections into a immutable parallel range formed by the elements of these traversable collections.

    [use case]

    Converts this immutable parallel range of traversable collections into a immutable parallel range formed by the elements of these traversable collections.

    The resulting collection's type will be guided by the static type of immutable parallel range. For example:

    val xs = List(Set(1, 2, 3), Set(1, 2, 3))
    // xs == List(1, 2, 3, 1, 2, 3)
    
    val ys = Set(List(1, 2, 3), List(3, 2, 1))
    // ys == Set(1, 2, 3)
    B

    the type of the elements of each traversable collection.

    returns

    a new immutable parallel range resulting from concatenating all element immutable parallel ranges.

    Definition Classes
    GenericTraversableTemplate
    Full Signature

    def flatten[B](implicit asTraversable: (Int) ⇒ GenTraversableOnce[B]): ParSeq[B]

  52. def fold[U >: Int](z: U)(op: (U, U) ⇒ U): U

    Folds the elements of this sequence using the specified associative binary operator.

    Folds the elements of this sequence using the specified associative binary operator. The order in which the elements are reduced is unspecified and may be nondeterministic.

    Note this method has a different signature than the foldLeft and foldRight methods of the trait Traversable. The result of folding may only be a supertype of this parallel collection's type parameter T.

    U

    a type parameter for the binary operator, a supertype of T.

    z

    a neutral element for the fold operation, it may be added to the result an arbitrary number of times, not changing the result (e.g. Nil for list concatenation, 0 for addition, or 1 for multiplication)

    op

    a binary operator that must be associative

    returns

    the result of applying fold operator op between all the elements and z

    Definition Classes
    ParIterableLikeGenTraversableOnce
  53. def foldLeft[S](z: S)(op: (S, Int) ⇒ S): S

    Applies a binary operator to a start value and all elements of this immutable parallel range, going left to right.

    Applies a binary operator to a start value and all elements of this immutable parallel range, going left to right.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    z

    the start value.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this immutable parallel range, going left to right with the start value z on the left:

    op(...op(z, x_1), x_2, ..., x_n)

    where x1, ..., xn are the elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  54. def foldRight[S](z: S)(op: (Int, S) ⇒ S): S

    Applies a binary operator to all elements of this immutable parallel range and a start value, going right to left.

    Applies a binary operator to all elements of this immutable parallel range and a start value, going right to left.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    z

    the start value.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this immutable parallel range, going right to left with the start value z on the right:

    op(x_1, op(x_2, ... op(x_n, z)...))

    where x1, ..., xn are the elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  55. def forall(pred: (Int) ⇒ Boolean): Boolean

    Tests whether a predicate holds for all elements of this immutable parallel range.

    Tests whether a predicate holds for all elements of this immutable parallel range.

    This method will use abort signalling capabilities. This means that splitters may send and read abort signals.

    pred

    a predicate used to test elements

    returns

    true if p holds for all elements, false otherwise

    Definition Classes
    ParIterableLikeGenTraversableOnce
  56. def foreach[U](f: (Int) ⇒ U): Unit

    Applies a function f to all the elements of immutable parallel range in a undefined order.

    Applies a function f to all the elements of immutable parallel range in a undefined order.

    U

    the result type of the function applied to each element, which is always discarded

    f

    function applied to each element

    Definition Classes
    ParIterableLikeGenTraversableLikeGenTraversableOnce
  57. def formatted(fmtstr: String): String

    Returns string formatted according to given format string.

    Returns string formatted according to given format string. Format strings are as for String.format (@see java.lang.String.format).

    Implicit information
    This member is added by an implicit conversion from ParRange to StringFormat performed by method any2stringfmt in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  58. def genericBuilder[B]: Combiner[B, ParSeq[B]]

    The generic builder that builds instances of immutable.ParRange at arbitrary element types.

    The generic builder that builds instances of immutable.ParRange at arbitrary element types.

    Definition Classes
    GenericParTemplateGenericTraversableTemplate
  59. def genericCombiner[B]: Combiner[B, ParSeq[B]]

    Definition Classes
    GenericParTemplate
  60. final def getClass(): Class[_]

    A representation that corresponds to the dynamic class of the receiver object.

    A representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

    a representation that corresponds to the dynamic class of the receiver object.

    Definition Classes
    AnyRef → Any
    Note

    not specified by SLS as a member of AnyRef

  61. def groupBy[K](f: (Int) ⇒ K): ParMap[K, ParSeq[Int]]

    Partitions this immutable parallel range into a map of immutable parallel ranges according to some discriminator function.

    Partitions this immutable parallel range into a map of immutable parallel ranges according to some discriminator function.

    Note: this method is not re-implemented by views. This means when applied to a view it will always force the view and return a new immutable parallel range.

    K

    the type of keys returned by the discriminator function.

    f

    the discriminator function.

    returns

    A map from keys to immutable parallel ranges such that the following invariant holds:

    (xs partition f)(k) = xs filter (x => f(x) == k)

    That is, every key k is bound to a immutable parallel range of those elements x for which f(x) equals k.

    Definition Classes
    ParIterableLikeGenTraversableLike
  62. def hasDefiniteSize: Boolean

    Definition Classes
    ParIterableLikeGenTraversableOnce
  63. def hashCode(): Int

    Hashcodes for immutable.ParRange produce a value from the hashcodes of all the elements of the immutable parallel range.

    Hashcodes for immutable.ParRange produce a value from the hashcodes of all the elements of the immutable parallel range.

    returns

    the hash code value for this object.

    Definition Classes
    GenSeqLikeAny
  64. def head: Int

    Selects the first element of this immutable parallel range.

    Selects the first element of this immutable parallel range.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

    the first element of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableLike
    Exceptions thrown
    `NoSuchElementException`

    if the immutable parallel range is empty.

  65. def headOption: Option[Int]

    Optionally selects the first element.

    Optionally selects the first element.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

    the first element of this immutable parallel range if it is nonempty, None if it is empty.

    Definition Classes
    ParIterableLikeGenTraversableLike
  66. def ifParSeq[R](isbody: (parallel.ParSeq[Int]) ⇒ R): (TraversableOps[Int])#Otherwise[R]

    Implicit information
    This member is added by an implicit conversion from ParRange to TraversableOps[Int] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  67. def indexOf(elem: Int, from: Int): Int

    [use case] Finds index of first occurrence of some value in this immutable parallel range after or at some start index.

    [use case]

    Finds index of first occurrence of some value in this immutable parallel range after or at some start index.

    Note: may not terminate for infinite-sized collections.

    elem

    the element value to search for.

    from

    the start index

    returns

    the index >= from of the first element of this immutable parallel range that is equal (as determined by ==) to elem, or -1, if none exists.

    Definition Classes
    GenSeqLike
    Full Signature

    def indexOf[B >: Int](elem: B, from: Int): Int

  68. def indexOf(elem: Int): Int

    [use case] Finds index of first occurrence of some value in this immutable parallel range.

    [use case]

    Finds index of first occurrence of some value in this immutable parallel range.

    Note: may not terminate for infinite-sized collections.

    elem

    the element value to search for.

    returns

    the index of the first element of this immutable parallel range that is equal (as determined by ==) to elem, or -1, if none exists.

    Definition Classes
    GenSeqLike
    Full Signature

    def indexOf[B >: Int](elem: B): Int

  69. def indexWhere(p: (Int) ⇒ Boolean, from: Int): Int

    Finds the first element satisfying some predicate.

    Finds the first element satisfying some predicate.

    This method will use indexFlag signalling capabilities. This means that splitters may set and read the indexFlag state.

    The index flag is initially set to maximum integer value.

    p

    the predicate used to test the elements

    from

    the starting offset for the search

    returns

    the index >= from of the first element of this immutable parallel range that satisfies the predicate p, or -1, if none exists

    Definition Classes
    ParSeqLikeGenSeqLike
  70. def indexWhere(p: (Int) ⇒ Boolean): Int

    Finds index of first element satisfying some predicate.

    Finds index of first element satisfying some predicate.

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    the index of the first element of this immutable parallel range that satisfies the predicate p, or -1, if none exists.

    Definition Classes
    GenSeqLike
  71. def init: ParSeq[Int]

    Selects all elements except the last.

    Selects all elements except the last.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

    a immutable parallel range consisting of all elements of this immutable parallel range except the last one.

    Definition Classes
    ParIterableLikeGenTraversableLike
    Exceptions thrown
    `UnsupportedOperationException`

    if the immutable parallel range is empty.

  72. def initTaskSupport(): Unit

    Attributes
    protected
    Definition Classes
    ParIterableLike
  73. def intersect(that: scala.Seq[Int]): ParRange[Int]

    [use case] Computes the multiset intersection between this immutable parallel range and another sequence.

    [use case]

    Computes the multiset intersection between this immutable parallel range and another sequence.

    Note: may not terminate for infinite-sized collections.

    that

    the sequence of elements to intersect with.

    returns

    a new immutable parallel range which contains all elements of this immutable parallel range which also appear in that. If an element value x appears n times in that, then the first n occurrences of x will be retained in the result, but any following occurrences will be omitted.

    Definition Classes
    ParSeqLikeGenSeqLike
    Full Signature

    def intersect[U >: Int](that: GenSeq[U]): ParSeq[Int]

  74. def isDefinedAt(idx: Int): Boolean

    Tests whether this immutable parallel range contains given index.

    Tests whether this immutable parallel range contains given index.

    The implementations of methods apply and isDefinedAt turn a Seq[A] into a PartialFunction[Int, A].

    idx

    the index to test

    returns

    true if this immutable parallel range contains an element at position idx, false otherwise.

    Definition Classes
    GenSeqLike
  75. def isEmpty: Boolean

    Tests whether the immutable parallel range is empty.

    Tests whether the immutable parallel range is empty.

    returns

    true if the immutable parallel range contains no elements, false otherwise.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  76. final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object is T0.

    Test whether the dynamic type of the receiver object is T0.

    Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression 1.isInstanceOf[String] will return false, while the expression List(1).isInstanceOf[List[String]] will return true. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

    returns

    true if the receiver object is an instance of erasure of type T0; false otherwise.

    Definition Classes
    Any
  77. def isParIterable: Boolean

    Implicit information
    This member is added by an implicit conversion from ParRange to TraversableOps[Int] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  78. def isParSeq: Boolean

    Implicit information
    This member is added by an implicit conversion from ParRange to TraversableOps[Int] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  79. def isParallel: Boolean

    Implicit information
    This member is added by an implicit conversion from ParRange to TraversableOps[Int] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  80. def isStrictSplitterCollection: Boolean

    Denotes whether this parallel collection has strict splitters.

    Denotes whether this parallel collection has strict splitters.

    This is true in general, and specific collection instances may choose to override this method. Such collections will fail to execute methods which rely on splitters being strict, i.e. returning a correct value in the remaining method.

    This method helps ensure that such failures occur on method invocations, rather than later on and in unpredictable ways.

    Definition Classes
    ParIterableLike
  81. final def isTraversableAgain: Boolean

    Tests whether this immutable parallel range can be repeatedly traversed.

    Tests whether this immutable parallel range can be repeatedly traversed.

    returns

    true

    Definition Classes
    ParIterableLikeGenTraversableLikeGenTraversableOnce
  82. def iterator: PreciseSplitter[Int]

    Creates a new split iterator used to traverse the elements of this collection.

    Creates a new split iterator used to traverse the elements of this collection.

    By default, this method is implemented in terms of the protected splitter method.

    returns

    a split iterator

    Definition Classes
    ParSeqLikeParIterableLikeGenIterableLike
  83. def last: Int

    Selects the last element.

    Selects the last element.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

    The last element of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableLike
    Exceptions thrown
    NoSuchElementException

    If the immutable parallel range is empty.

  84. def lastIndexOf(elem: Int, end: Int): Int

    [use case] Finds index of last occurrence of some value in this immutable parallel range before or at a given end index.

    [use case]

    Finds index of last occurrence of some value in this immutable parallel range before or at a given end index.

    elem

    the element value to search for.

    end

    the end index.

    returns

    the index <= end of the last element of this immutable parallel range that is equal (as determined by ==) to elem, or -1, if none exists.

    Definition Classes
    GenSeqLike
    Full Signature

    def lastIndexOf[B >: Int](elem: B, end: Int): Int

  85. def lastIndexOf(elem: Int): Int

    [use case] Finds index of last occurrence of some value in this immutable parallel range.

    [use case]

    Finds index of last occurrence of some value in this immutable parallel range.

    Note: will not terminate for infinite-sized collections.

    elem

    the element value to search for.

    returns

    the index of the last element of this immutable parallel range that is equal (as determined by ==) to elem, or -1, if none exists.

    Definition Classes
    GenSeqLike
    Full Signature

    def lastIndexOf[B >: Int](elem: B): Int

  86. def lastIndexWhere(p: (Int) ⇒ Boolean, end: Int): Int

    Finds the last element satisfying some predicate.

    Finds the last element satisfying some predicate.

    This method will use indexFlag signalling capabilities. This means that splitters may set and read the indexFlag state.

    The index flag is initially set to minimum integer value.

    p

    the predicate used to test the elements

    end

    the maximum offset for the search

    returns

    the index <= end of the first element of this immutable parallel range that satisfies the predicate p, or -1, if none exists

    Definition Classes
    ParSeqLikeGenSeqLike
  87. def lastIndexWhere(p: (Int) ⇒ Boolean): Int

    Finds index of last element satisfying some predicate.

    Finds index of last element satisfying some predicate.

    Note: will not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    the index of the last element of this immutable parallel range that satisfies the predicate p, or -1, if none exists.

    Definition Classes
    GenSeqLike
  88. def lastOption: Option[Int]

    Optionally selects the last element.

    Optionally selects the last element.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

    the last element of this immutable parallel range$ if it is nonempty, None if it is empty.

    Definition Classes
    ParIterableLikeGenTraversableLike
  89. final def length: Int

    The length of the immutable parallel range.

    The length of the immutable parallel range.

    Note: will not terminate for infinite-sized collections.

    Note: xs.length and xs.size yield the same result.

    returns

    the number of elements in this immutable parallel range.

    Definition Classes
    ParRangeGenSeqLike
    Annotations
    @inline()
  90. def map[B](f: (A) ⇒ B): ParRange[B]

    [use case] Builds a new collection by applying a function to all elements of this immutable parallel range.

    [use case]

    Builds a new collection by applying a function to all elements of this immutable parallel range.

    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

    a new immutable parallel range resulting from applying the given function f to each element of this immutable parallel range and collecting the results.

    Definition Classes
    ParIterableLikeGenTraversableLike
    Full Signature

    def map[S, That](f: (Int) ⇒ S)(implicit bf: CanBuildFrom[ParSeq[Int], S, That]): That

  91. def max: A

    [use case] Finds the largest element.

    [use case]

    Finds the largest element.

    returns

    the largest element of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Full Signature

    def max[U >: Int](implicit ord: Ordering[U]): Int

  92. def maxBy[S](f: (Int) ⇒ S)(implicit cmp: Ordering[S]): Int

    Definition Classes
    ParIterableLikeGenTraversableOnce
  93. def min: A

    [use case] Finds the smallest element.

    [use case]

    Finds the smallest element.

    returns

    the smallest element of this immutable parallel range

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Full Signature

    def min[U >: Int](implicit ord: Ordering[U]): Int

  94. def minBy[S](f: (Int) ⇒ S)(implicit cmp: Ordering[S]): Int

    Definition Classes
    ParIterableLikeGenTraversableOnce
  95. def mkString: String

    Displays all elements of this immutable parallel range in a string.

    Displays all elements of this immutable parallel range in a string.

    returns

    a string representation of this immutable parallel range. In the resulting string the string representations (w.r.t. the method toString) of all elements of this immutable parallel range follow each other without any separator string.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  96. def mkString(sep: String): String

    Displays all elements of this immutable parallel range in a string using a separator string.

    Displays all elements of this immutable parallel range in a string using a separator string.

    sep

    the separator string.

    returns

    a string representation of this immutable parallel range. In the resulting string the string representations (w.r.t. the method toString) of all elements of this immutable parallel range are separated by the string sep.

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Example:
    1. List(1, 2, 3).mkString("|") = "1|2|3"

  97. def mkString(start: String, sep: String, end: String): String

    Displays all elements of this immutable parallel range in a string using start, end, and separator strings.

    Displays all elements of this immutable parallel range in a string using start, end, and separator strings.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    a string representation of this immutable parallel range. The resulting string begins with the string start and ends with the string end. Inside, the string representations (w.r.t. the method toString) of all elements of this immutable parallel range are separated by the string sep.

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Example:
    1. List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"

  98. final def ne(arg0: AnyRef): Boolean

    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

    true if the argument is not a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  99. def newBuilder: Builder[Int, ParSeq[Int]]

    The builder that builds instances of type immutable.ParRange[A]

    The builder that builds instances of type immutable.ParRange[A]

    Attributes
    protected[this]
    Definition Classes
    GenericParTemplateGenericTraversableTemplateHasNewBuilder
  100. def newCombiner: Combiner[Int, ParSeq[Int]]

    Attributes
    protected[this]
    Definition Classes
    GenericParTemplateHasNewCombiner
  101. def nonEmpty: Boolean

    Tests whether the immutable parallel range is not empty.

    Tests whether the immutable parallel range is not empty.

    returns

    true if the immutable parallel range contains at least one element, false otherwise.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  102. final def notify(): Unit

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Note

    not specified by SLS as a member of AnyRef

  103. final def notifyAll(): Unit

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Note

    not specified by SLS as a member of AnyRef

  104. def padTo(len: Int, elem: A): ParRange[A]

    [use case] A copy of this immutable parallel range with an element value appended until a given target length is reached.

    [use case]

    A copy of this immutable parallel range with an element value appended until a given target length is reached.

    len

    the target length

    elem

    the padding value

    returns

    a new immutable parallel range consisting of all elements of this immutable parallel range followed by the minimal number of occurrences of elem so that the resulting immutable parallel range has a length of at least len.

    Definition Classes
    ParSeqLikeGenSeqLike
    Full Signature

    def padTo[U >: Int, That](len: Int, elem: U)(implicit bf: CanBuildFrom[ParSeq[Int], U, That]): That

  105. def par: ParSeq[Int]

    Returns a parallel implementation of this collection.

    Returns a parallel implementation of this collection.

    For most collection types, this method creates a new parallel collection by copying all the elements. For these collection, par takes linear time. Mutable collections in this category do not produce a mutable parallel collection that has the same underlying dataset, so changes in one collection will not be reflected in the other one.

    Specific collections (e.g. ParArray or mutable.ParHashMap) override this default behaviour by creating a parallel collection which shares the same underlying dataset. For these collections, par takes constant or sublinear time.

    All parallel collections return a reference to themselves.

    returns

    a parallel implementation of this collection

    Definition Classes
    ParIterableLikeCustomParallelizableParallelizable
  106. def parCombiner: Combiner[Int, ParSeq[Int]]

    The default par implementation uses the combiner provided by this method to create a new parallel collection.

    The default par implementation uses the combiner provided by this method to create a new parallel collection.

    returns

    a combiner for the parallel collection of type ParRepr

    Attributes
    protected[this]
    Definition Classes
    CustomParallelizableParallelizable
  107. def partition(pred: (Int) ⇒ Boolean): (ParSeq[Int], ParSeq[Int])

    Partitions this immutable parallel range in two immutable parallel ranges according to a predicate.

    Partitions this immutable parallel range in two immutable parallel ranges according to a predicate.

    pred

    the predicate on which to partition.

    returns

    a pair of immutable parallel ranges: the first immutable parallel range consists of all elements that satisfy the predicate p and the second immutable parallel range consists of all elements that don't. The relative order of the elements in the resulting immutable parallel ranges may not be preserved.

    Definition Classes
    ParIterableLikeGenTraversableLike
  108. def patch(from: Int, that: GenSeq[A], replaced: Int): ParRange[A]

    [use case] Produces a new immutable parallel range where a slice of elements in this immutable parallel range is replaced by another sequence.

    [use case]

    Produces a new immutable parallel range where a slice of elements in this immutable parallel range is replaced by another sequence.

    from

    the index of the first replaced element

    replaced

    the number of elements to drop in the original immutable parallel range

    returns

    a new immutable parallel range consisting of all elements of this immutable parallel range except that replaced elements starting from from are replaced by patch.

    Definition Classes
    ParSeqLikeGenSeqLike
    Full Signature

    def patch[U >: Int, That](from: Int, patch: GenSeq[U], replaced: Int)(implicit bf: CanBuildFrom[ParSeq[Int], U, That]): That

  109. def prefixLength(p: (Int) ⇒ Boolean): Int

    Returns the length of the longest prefix whose elements all satisfy some predicate.

    Returns the length of the longest prefix whose elements all satisfy some predicate.

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    the length of the longest prefix of this immutable parallel range such that every element of the segment satisfies the predicate p.

    Definition Classes
    GenSeqLike
  110. def product: A

    [use case] Multiplies up the elements of this collection.

    [use case]

    Multiplies up the elements of this collection.

    returns

    the product of all elements in this immutable parallel range of numbers of type Int. Instead of Int, any other type T with an implicit Numeric[T] implementation can be used as element type of the immutable parallel range and as result type of product. Examples of such types are: Long, Float, Double, BigInt.

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Full Signature

    def product[U >: Int](implicit num: Numeric[U]): U

  111. val range: immutable.Range

    the sequential range this parallel range was obtained from

  112. def reduce[U >: Int](op: (U, U) ⇒ U): U

    Reduces the elements of this sequence using the specified associative binary operator.

    Reduces the elements of this sequence using the specified associative binary operator.

    The order in which operations are performed on elements is unspecified and may be nondeterministic.

    Note this method has a different signature than the reduceLeft and reduceRight methods of the trait Traversable. The result of reducing may only be a supertype of this parallel collection's type parameter T.

    U

    A type parameter for the binary operator, a supertype of T.

    op

    A binary operator that must be associative.

    returns

    The result of applying reduce operator op between all the elements if the collection is nonempty.

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Exceptions thrown
    UnsupportedOperationException

    if this immutable parallel range is empty.

  113. def reduceLeft[U >: Int](op: (U, Int) ⇒ U): U

    Definition Classes
    ParIterableLike
  114. def reduceLeftOption[U >: Int](op: (U, Int) ⇒ U): Option[U]

    Optionally applies a binary operator to all elements of this immutable parallel range, going left to right.

    Optionally applies a binary operator to all elements of this immutable parallel range, going left to right.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    op

    the binary operator.

    returns

    an option value containing the result of reduceLeft(op) is this immutable parallel range is nonempty, None otherwise.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  115. def reduceOption[U >: Int](op: (U, U) ⇒ U): Option[U]

    Optionally reduces the elements of this sequence using the specified associative binary operator.

    Optionally reduces the elements of this sequence using the specified associative binary operator.

    The order in which operations are performed on elements is unspecified and may be nondeterministic.

    Note this method has a different signature than the reduceLeftOption and reduceRightOption methods of the trait Traversable. The result of reducing may only be a supertype of this parallel collection's type parameter T.

    U

    A type parameter for the binary operator, a supertype of T.

    op

    A binary operator that must be associative.

    returns

    An option value containing result of applying reduce operator op between all the elements if the collection is nonempty, and None otherwise.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  116. def reduceRight[U >: Int](op: (Int, U) ⇒ U): U

    Applies a binary operator to all elements of this immutable parallel range, going right to left.

    Applies a binary operator to all elements of this immutable parallel range, going right to left.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this immutable parallel range, going right to left:

    op(x_1, op(x_2, ..., op(x_{n-1}, x_n)...))

    where x1, ..., xn are the elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Exceptions thrown
    `UnsupportedOperationException`

    if this immutable parallel range is empty.

  117. def reduceRightOption[U >: Int](op: (Int, U) ⇒ U): Option[U]

    Optionally applies a binary operator to all elements of this immutable parallel range, going right to left.

    Optionally applies a binary operator to all elements of this immutable parallel range, going right to left.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    op

    the binary operator.

    returns

    an option value containing the result of reduceRight(op) is this immutable parallel range is nonempty, None otherwise.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  118. def repr: ParSeq[Int]

    Definition Classes
    ParIterableLikeGenTraversableLike
  119. def reuse[S, That](oldc: Option[Combiner[S, That]], newc: Combiner[S, That]): Combiner[S, That]

    Optionally reuses an existing combiner for better performance.

    Optionally reuses an existing combiner for better performance. By default it doesn't - subclasses may override this behaviour. The provided combiner oldc that can potentially be reused will be either some combiner from the previous computational task, or None if there was no previous phase (in which case this method must return newc).

    oldc

    The combiner that is the result of the previous task, or None if there was no previous task.

    newc

    The new, empty combiner that can be used.

    returns

    Either newc or oldc.

    Attributes
    protected
    Definition Classes
    ParIterableLike
  120. def reverse: ParSeq[Int]

    Returns new immutable parallel range wih elements in reversed order.

    Returns new immutable parallel range wih elements in reversed order.

    Note: will not terminate for infinite-sized collections.

    returns

    A new immutable parallel range with all elements of this immutable parallel range in reversed order.

    Definition Classes
    ParSeqLikeGenSeqLike
  121. def reverseMap[B](f: (A) ⇒ B): ParRange[B]

    [use case] Builds a new collection by applying a function to all elements of this immutable parallel range and collecting the results in reversed order.

    [use case]

    Builds a new collection by applying a function to all elements of this immutable parallel range and collecting the results in reversed order.

    Note: will not terminate for infinite-sized collections.

    Note: xs.reverseMap(f) is the same as xs.reverse.map(f) but might be more efficient.

    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

    a new immutable parallel range resulting from applying the given function f to each element of this immutable parallel range and collecting the results in reversed order.

    Definition Classes
    ParSeqLikeGenSeqLike
    Full Signature

    def reverseMap[S, That](f: (Int) ⇒ S)(implicit bf: CanBuildFrom[ParSeq[Int], S, That]): That

  122. def sameElements(that: GenIterable[A]): Boolean

    [use case] Checks if the other iterable collection contains the same elements in the same order as this immutable parallel range.

    [use case]

    Checks if the other iterable collection contains the same elements in the same order as this immutable parallel range.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    Note: will not terminate for infinite-sized collections.

    that

    the collection to compare with.

    returns

    true, if both collections contain the same elements in the same order, false otherwise.

    Definition Classes
    ParSeqLikeParIterableLikeGenIterableLike
    Full Signature

    def sameElements[U >: Int](that: GenIterable[U]): Boolean

  123. def scan(z: Int)(op: (Int, Int) ⇒ Int): ParRange[Int]

    [use case] Computes a prefix scan of the elements of the collection.

    [use case]

    Computes a prefix scan of the elements of the collection.

    Note: The neutral element z may be applied more than once.

    z

    neutral element for the operator op

    op

    the associative operator for the scan

    returns

    a new immutable parallel range containing the prefix scan of the elements in this immutable parallel range

    Definition Classes
    ParIterableLikeGenTraversableLike
    Full Signature

    def scan[U >: Int, That](z: U)(op: (U, U) ⇒ U)(implicit bf: CanBuildFrom[ParSeq[Int], U, That]): That

  124. def scanBlockSize: Int

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  125. def scanLeft[S, That](z: S)(op: (S, Int) ⇒ S)(implicit bf: CanBuildFrom[ParSeq[Int], S, That]): That

    Produces a collection containing cumulative results of applying the operator going left to right.

    Produces a collection containing cumulative results of applying the operator going left to right.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    That

    the actual type of the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    bf

    an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and and the new element type B.

    returns

    collection with intermediate results

    Definition Classes
    ParIterableLikeGenTraversableLike
  126. def scanRight[S, That](z: S)(op: (Int, S) ⇒ S)(implicit bf: CanBuildFrom[ParSeq[Int], S, That]): That

    Produces a collection containing cumulative results of applying the operator going right to left.

    Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    Example:

    List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)
    That

    the actual type of the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    bf

    an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and and the new element type B.

    returns

    collection with intermediate results

    Definition Classes
    ParIterableLikeGenTraversableLike
  127. def segmentLength(p: (Int) ⇒ Boolean, from: Int): Int

    Returns the length of the longest segment of elements starting at a given position satisfying some predicate.

    Returns the length of the longest segment of elements starting at a given position satisfying some predicate.

    This method will use indexFlag signalling capabilities. This means that splitters may set and read the indexFlag state.

    The index flag is initially set to maximum integer value.

    p

    the predicate used to test the elements

    from

    the starting offset for the search

    returns

    the length of the longest segment of elements starting at from and satisfying the predicate

    Definition Classes
    ParSeqLikeGenSeqLike
  128. def seq: immutable.Range

  129. def sequentially[S, That <: Parallel](b: (immutable.Seq[Int]) ⇒ Parallelizable[S, That]): ParSeq[Int]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  130. def size: Int

    The size of this immutable parallel range.

    The size of this immutable parallel range.

    Note: will not terminate for infinite-sized collections.

    returns

    the number of elements in this immutable parallel range.

    Definition Classes
    ParSeqLikeGenTraversableLikeGenTraversableOnce
  131. def slice(unc_from: Int, unc_until: Int): ParSeq[Int]

    Selects an interval of elements.

    Selects an interval of elements. The returned collection is made up of all elements x which satisfy the invariant:

    from <= indexOf(x) < until

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    unc_from

    the lowest index to include from this immutable parallel range.

    unc_until

    the lowest index to EXCLUDE from this immutable parallel range.

    returns

    a immutable parallel range containing the elements greater than or equal to index from extending up to (but not including) index until of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableLike
  132. def span(pred: (Int) ⇒ Boolean): (ParSeq[Int], ParSeq[Int])

    Splits this immutable parallel range into a prefix/suffix pair according to a predicate.

    Splits this immutable parallel range into a prefix/suffix pair according to a predicate.

    This method will use indexFlag signalling capabilities. This means that splitters may set and read the indexFlag state. The index flag is initially set to maximum integer value.

    pred

    the predicate used to test the elements

    returns

    a pair consisting of the longest prefix of the collection for which all the elements satisfy pred, and the rest of the collection

    Definition Classes
    ParIterableLikeGenTraversableLike
  133. def splitAt(n: Int): (ParSeq[Int], ParSeq[Int])

    Splits this immutable parallel range into two at a given position.

    Splits this immutable parallel range into two at a given position. Note: c splitAt n is equivalent to (but possibly more efficient than) (c take n, c drop n).

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    n

    the position at which to split.

    returns

    a pair of immutable parallel ranges consisting of the first n elements of this immutable parallel range, and the other elements.

    Definition Classes
    ParIterableLikeGenTraversableLike
  134. def splitter: ParRangeIterator

    A more refined version of the iterator found in the ParallelIterable trait, this iterator can be split into arbitrary subsets of iterators.

    A more refined version of the iterator found in the ParallelIterable trait, this iterator can be split into arbitrary subsets of iterators.

    returns

    an iterator that can be split into subsets of precise size

    Definition Classes
    ParRangeParSeqLikeParIterableLike
  135. def startsWith[S](that: GenSeq[S], offset: Int): Boolean

    Tests whether this immutable parallel range contains the given sequence at a given index.

    Tests whether this immutable parallel range contains the given sequence at a given index.

    This method will use abort signalling capabilities. This means that splitters may send and read abort signals.

    S

    the element type of that parallel sequence

    that

    the parallel sequence this sequence is being searched for

    offset

    the starting offset for the search

    returns

    true if there is a sequence that starting at offset in this sequence, false otherwise

    Definition Classes
    ParSeqLikeGenSeqLike
  136. def startsWith[B](that: GenSeq[B]): Boolean

    Tests whether this immutable parallel range starts with the given sequence.

    Tests whether this immutable parallel range starts with the given sequence.

    that

    the sequence to test

    returns

    true if this collection has that as a prefix, false otherwise.

    Definition Classes
    GenSeqLike
  137. def stringPrefix: String

    Defines the prefix of this object's toString representation.

    Defines the prefix of this object's toString representation.

    returns

    a string representation which starts the result of toString applied to this immutable parallel range. By default the string prefix is the simple name of the collection class immutable parallel range.

    Definition Classes
    ParSeqParIterableGenTraversableLike
  138. def sum: A

    [use case] Sums up the elements of this collection.

    [use case]

    Sums up the elements of this collection.

    returns

    the sum of all elements in this immutable parallel range of numbers of type Int. Instead of Int, any other type T with an implicit Numeric[T] implementation can be used as element type of the immutable parallel range and as result type of sum. Examples of such types are: Long, Float, Double, BigInt.

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Full Signature

    def sum[U >: Int](implicit num: Numeric[U]): U

  139. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef
  140. def tail: ParSeq[Int]

    Selects all elements except the first.

    Selects all elements except the first.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

    a immutable parallel range consisting of all elements of this immutable parallel range except the first one.

    Definition Classes
    ParIterableLikeGenTraversableLike
    Exceptions thrown
    `UnsupportedOperationException`

    if the immutable parallel range is empty.

  141. def take(n: Int): ParSeq[Int]

    Selects first n elements.

    Selects first n elements.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    n

    the number of elements to take from this immutable parallel range.

    returns

    a immutable parallel range consisting only of the first n elements of this immutable parallel range, or else the whole immutable parallel range, if it has less than n elements.

    Definition Classes
    ParIterableLikeGenTraversableLike
  142. def takeWhile(pred: (Int) ⇒ Boolean): ParSeq[Int]

    Takes the longest prefix of elements that satisfy the predicate.

    Takes the longest prefix of elements that satisfy the predicate.

    This method will use indexFlag signalling capabilities. This means that splitters may set and read the indexFlag state. The index flag is initially set to maximum integer value.

    pred

    the predicate used to test the elements

    returns

    the longest prefix of this immutable parallel range of elements that satisy the predicate pred

    Definition Classes
    ParIterableLikeGenTraversableLike
  143. implicit def task2ops[R, Tp](tsk: SSCTask[R, Tp]): TaskOps[R, Tp]

    Attributes
    protected
    Definition Classes
    ParIterableLike
  144. def tasksupport: TaskSupport

    The task support object which is responsible for scheduling and load-balancing tasks to processors.

    The task support object which is responsible for scheduling and load-balancing tasks to processors.

    Definition Classes
    ParIterableLike
    See also

    scala.collection.parallel.TaskSupport

  145. def tasksupport_=(ts: TaskSupport): Unit

    Changes the task support object which is responsible for scheduling and load-balancing tasks to processors.

    Changes the task support object which is responsible for scheduling and load-balancing tasks to processors.

    A task support object can be changed in a parallel collection after it has been created, but only during a quiescent period, i.e. while there are no concurrent invocations to parallel collection methods.

    Here is a way to change the task support of a parallel collection:

    import scala.collection.parallel._
    val pc = mutable.ParArray(1, 2, 3)
    pc.tasksupport = new ForkJoinTaskSupport(
      new scala.concurrent.forkjoin.ForkJoinPool(2))
    Definition Classes
    ParIterableLike
    See also

    scala.collection.parallel.TaskSupport

  146. def to[Col[_]]: Col[A]

    [use case] Converts this immutable parallel range into another by copying all elements.

    [use case]

    Converts this immutable parallel range into another by copying all elements.

    Note: will not terminate for infinite-sized collections.

    Col

    The collection type to build.

    returns

    a new collection containing all elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Full Signature

    def to[Col[_]](implicit cbf: CanBuildFrom[Nothing, Int, Col[Int]]): Col[Int]

  147. def toArray: Array[A]

    [use case] Converts this immutable parallel range to an array.

    [use case]

    Converts this immutable parallel range to an array.

    Note: will not terminate for infinite-sized collections.

    returns

    an array containing all elements of this immutable parallel range. An ClassTag must be available for the element type of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Full Signature

    def toArray[U >: Int](implicit arg0: ClassTag[U]): Array[U]

  148. def toBuffer[U >: Int]: Buffer[U]

    Converts this immutable parallel range to a mutable buffer.

    Converts this immutable parallel range to a mutable buffer.

    Note: will not terminate for infinite-sized collections.

    returns

    a buffer containing all elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  149. def toIndexedSeq: immutable.IndexedSeq[Int]

    Converts this immutable parallel range to an indexed sequence.

    Converts this immutable parallel range to an indexed sequence.

    Note: will not terminate for infinite-sized collections.

    returns

    an indexed sequence containing all elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  150. def toIterable: ParIterable[Int]

    Converts this immutable parallel range to an iterable collection.

    Converts this immutable parallel range to an iterable collection. Note that the choice of target Iterable is lazy in this default implementation as this TraversableOnce may be lazy and unevaluated (i.e. it may be an iterator which is only traversable once).

    Note: will not terminate for infinite-sized collections.

    returns

    an Iterable containing all elements of this immutable parallel range.

    Definition Classes
    ParIterableParIterableLikeGenTraversableOnce
  151. def toIterator: scala.Iterator[Int]

    Returns an Iterator over the elements in this immutable parallel range.

    Returns an Iterator over the elements in this immutable parallel range. Will return the same Iterator if this instance is already an Iterator.

    Note: will not terminate for infinite-sized collections.

    returns

    an Iterator containing all elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  152. def toList: List[Int]

    Converts this immutable parallel range to a list.

    Converts this immutable parallel range to a list.

    Note: will not terminate for infinite-sized collections.

    returns

    a list containing all elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  153. def toMap[T, U]: collection.Map[T, U]

    [use case] Converts this immutable parallel range to a map.

    [use case]

    Converts this immutable parallel range to a map. This method is unavailable unless the elements are members of Tuple2, each ((T, U)) becoming a key-value pair in the map. Duplicate keys will be overwritten by later keys: if this is an unordered collection, which key is in the resulting map is undefined.

    Note: will not terminate for infinite-sized collections.

    returns

    a map of type immutable.Map[T, U] containing all key/value pairs of type (T, U) of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Full Signature

    def toMap[K, V](implicit ev: <:<[Int, (K, V)]): ParMap[K, V]

  154. def toParArray: ParArray[Int]

    Implicit information
    This member is added by an implicit conversion from ParRange to TraversableOps[Int] performed by method traversable2ops in scala.collection.parallel.
    Definition Classes
    TraversableOps
  155. def toParCollection[U >: Int, That](cbf: () ⇒ Combiner[U, That]): That

    Attributes
    protected
    Definition Classes
    ParIterableLike
  156. def toParMap[K, V, That](cbf: () ⇒ Combiner[(K, V), That])(implicit ev: <:<[Int, (K, V)]): That

    Attributes
    protected
    Definition Classes
    ParIterableLike
  157. def toSeq: ParSeq[Int]

    Converts this immutable parallel range to a sequence.

    Converts this immutable parallel range to a sequence. As with toIterable, it's lazy in this default implementation, as this TraversableOnce may be lazy and unevaluated.

    Note: will not terminate for infinite-sized collections.

    returns

    a sequence containing all elements of this immutable parallel range.

    Definition Classes
    ParSeqParIterableParSeqLikeParIterableLikeGenSeqLikeGenTraversableOnce
  158. def toSet[U >: Int]: ParSet[U]

    Converts this immutable parallel range to a set.

    Converts this immutable parallel range to a set.

    Note: will not terminate for infinite-sized collections.

    returns

    a set containing all elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  159. def toStream: Stream[Int]

    Converts this immutable parallel range to a stream.

    Converts this immutable parallel range to a stream.

    Note: will not terminate for infinite-sized collections.

    returns

    a stream containing all elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  160. def toString(): String

    Creates a String representation of this object.

    Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

    returns

    a String representation of the object.

    Definition Classes
    ParSeqParSeqLikeParIterableLike → AnyRef → Any
  161. def toTraversable: GenTraversable[Int]

    Converts this immutable parallel range to an unspecified Traversable.

    Converts this immutable parallel range to an unspecified Traversable. Will return the same collection if this instance is already Traversable.

    Note: will not terminate for infinite-sized collections.

    returns

    a Traversable containing all elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  162. def toVector: Vector[Int]

    Converts this immutable parallel range to a Vector.

    Converts this immutable parallel range to a Vector.

    Note: will not terminate for infinite-sized collections.

    returns

    a vector containing all elements of this immutable parallel range.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  163. def transpose[B](implicit asTraversable: (Int) ⇒ GenTraversableOnce[B]): ParSeq[ParSeq[B]]

    Transposes this immutable parallel range of traversable collections into a immutable parallel range of immutable parallel ranges.

    Transposes this immutable parallel range of traversable collections into a immutable parallel range of immutable parallel ranges.

    B

    the type of the elements of each traversable collection.

    asTraversable

    an implicit conversion which asserts that the element type of this immutable parallel range is a Traversable.

    returns

    a two-dimensional immutable parallel range of immutable parallel ranges which has as nth row the nth column of this immutable parallel range.

    Definition Classes
    GenericTraversableTemplate
    Annotations
    @migration
    Migration

    (Changed in version 2.9.0) transpose throws an IllegalArgumentException if collections are not uniformly sized.

    Exceptions thrown
    `IllegalArgumentException`

    if all collections in this immutable parallel range are not of the same size.

  164. def union(that: GenSeq[Int]): ParRange[Int]

    [use case] Produces a new sequence which contains all elements of this immutable parallel range and also all elements of a given sequence.

    [use case]

    Produces a new sequence which contains all elements of this immutable parallel range and also all elements of a given sequence. xs union ys is equivalent to xs ++ ys.

    Another way to express this is that xs union ys computes the order-presevring multi-set union of xs and ys. union is hence a counter-part of diff and intersect which also work on multi-sets.

    Note: will not terminate for infinite-sized collections.

    that

    the sequence to add.

    returns

    a new immutable parallel range which contains all elements of this immutable parallel range followed by all elements of that.

    Definition Classes
    GenSeqLike
    Full Signature

    def union[B >: Int, That](that: GenSeq[B])(implicit bf: CanBuildFrom[ParSeq[Int], B, That]): That

  165. def unzip[A1, A2](implicit asPair: (Int) ⇒ (A1, A2)): (ParSeq[A1], ParSeq[A2])

    Converts this immutable parallel range of pairs into two collections of the first and second half of each pair.

    Converts this immutable parallel range of pairs into two collections of the first and second half of each pair.

    A1

    the type of the first half of the element pairs

    A2

    the type of the second half of the element pairs

    asPair

    an implicit conversion which asserts that the element type of this immutable parallel range is a pair.

    returns

    a pair immutable parallel ranges, containing the first, respectively second half of each element pair of this immutable parallel range.

    Definition Classes
    GenericTraversableTemplate
  166. def unzip3[A1, A2, A3](implicit asTriple: (Int) ⇒ (A1, A2, A3)): (ParSeq[A1], ParSeq[A2], ParSeq[A3])

    Converts this immutable parallel range of triples into three collections of the first, second, and third element of each triple.

    Converts this immutable parallel range of triples into three collections of the first, second, and third element of each triple.

    A1

    the type of the first member of the element triples

    A2

    the type of the second member of the element triples

    A3

    the type of the third member of the element triples

    asTriple

    an implicit conversion which asserts that the element type of this immutable parallel range is a triple.

    returns

    a triple immutable parallel ranges, containing the first, second, respectively third member of each element triple of this immutable parallel range.

    Definition Classes
    GenericTraversableTemplate
  167. def updated(index: Int, elem: A): ParRange[A]

    [use case] A copy of this immutable parallel range with one single replaced element.

    [use case]

    A copy of this immutable parallel range with one single replaced element.

    index

    the position of the replacement

    elem

    the replacing element

    returns

    a copy of this immutable parallel range with the element at position index replaced by elem.

    Definition Classes
    ParSeqLikeGenSeqLike
    Full Signature

    def updated[U >: Int, That](index: Int, elem: U)(implicit bf: CanBuildFrom[ParSeq[Int], U, That]): That

  168. def view: ParSeqView[Int, ParSeq[Int], immutable.Seq[Int]]

    Definition Classes
    ParSeqLikeParIterableLike
  169. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  170. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  171. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  172. def wrap[R](body: ⇒ R): NonDivisible[R]

    Attributes
    protected
    Definition Classes
    ParIterableLike
  173. def zip[B](that: GenIterable[B]): ParRange[(A, B)]

    [use case] Returns a immutable parallel range formed from this immutable parallel range and another iterable collection by combining corresponding elements in pairs.

    [use case]

    Returns a immutable parallel range formed from this immutable parallel range and another iterable collection by combining corresponding elements in pairs. If one of the two collections is longer than the other, its remaining elements are ignored.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    B

    the type of the second half of the returned pairs

    that

    The iterable providing the second half of each result pair

    returns

    a new immutable parallel range containing pairs consisting of corresponding elements of this immutable parallel range and that. The length of the returned collection is the minimum of the lengths of this immutable parallel range and that.

    Definition Classes
    ParSeqLikeParIterableLikeGenIterableLike
    Full Signature

    def zip[U >: Int, S, That](that: GenIterable[S])(implicit bf: CanBuildFrom[ParSeq[Int], (U, S), That]): That

  174. def zipAll[B](that: Iterable[B], thisElem: A, thatElem: B): ParRange[(A, B)]

    [use case] Returns a immutable parallel range formed from this immutable parallel range and another iterable collection by combining corresponding elements in pairs.

    [use case]

    Returns a immutable parallel range formed from this immutable parallel range and another iterable collection by combining corresponding elements in pairs. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    B

    the type of the second half of the returned pairs

    that

    The iterable providing the second half of each result pair

    thisElem

    the element to be used to fill up the result if this immutable parallel range is shorter than that.

    thatElem

    the element to be used to fill up the result if that is shorter than this immutable parallel range.

    returns

    a new immutable parallel range containing pairs consisting of corresponding elements of this immutable parallel range and that. The length of the returned collection is the maximum of the lengths of this immutable parallel range and that. If this immutable parallel range is shorter than that, thisElem values are used to pad the result. If that is shorter than this immutable parallel range, thatElem values are used to pad the result.

    Definition Classes
    ParIterableLikeGenIterableLike
    Full Signature

    def zipAll[S, U >: Int, That](that: GenIterable[S], thisElem: U, thatElem: S)(implicit bf: CanBuildFrom[ParSeq[Int], (U, S), That]): That

  175. def zipWithIndex: ParRange[(A, Int)]

    [use case] Zips this immutable parallel range with its indices.

    [use case]

    Zips this immutable parallel range with its indices.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

    A new immutable parallel range containing pairs consisting of all elements of this immutable parallel range paired with their index. Indices start at 0.

    Definition Classes
    ParIterableLikeGenIterableLike
    Full Signature

    def zipWithIndex[U >: Int, That](implicit bf: CanBuildFrom[ParSeq[Int], (U, Int), That]): That

    Example:
    1. List("a", "b", "c").zipWithIndex = List(("a", 0), ("b", 1), ("c", 2))

  176. def [B](y: B): (ParRange, B)

    Implicit information
    This member is added by an implicit conversion from ParRange to ArrowAssoc[ParRange] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Shadowed Implicit Value Members

  1. val self: Any

    Implicit information
    This member is added by an implicit conversion from ParRange to StringAdd performed by method any2stringadd in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (parRange: StringAdd).self
    Definition Classes
    StringAdd
  2. val self: Any

    Implicit information
    This member is added by an implicit conversion from ParRange to StringFormat performed by method any2stringfmt in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (parRange: StringFormat).self
    Definition Classes
    StringFormat

Deprecated Value Members

  1. def /:\[A1 >: Int](z: A1)(op: (A1, A1) ⇒ A1): A1

    A syntactic sugar for out of order folding.

    A syntactic sugar for out of order folding. See fold.

    Example:

    scala> val a = LinkedList(1,2,3,4)
    a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4)
    
    scala> val b = (a /:\ 5)(_+_)
    b: Int = 15
    Definition Classes
    GenTraversableOnce
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) use fold instead

  2. def x: ParRange

    Implicit information
    This member is added by an implicit conversion from ParRange to ArrowAssoc[ParRange] performed by method any2ArrowAssoc in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (parRange: ArrowAssoc[ParRange]).x
    Definition Classes
    ArrowAssoc
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) Use leftOfArrow instead

  3. def x: ParRange

    Implicit information
    This member is added by an implicit conversion from ParRange to Ensuring[ParRange] performed by method any2Ensuring in scala.Predef.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (parRange: Ensuring[ParRange]).x
    Definition Classes
    Ensuring
    Annotations
    @deprecated
    Deprecated

    (Since version 2.10.0) Use resultOfEnsuring instead

Inherited from Serializable

Inherited from java.io.Serializable

Inherited from ParSeq[Int]

Inherited from ParIterable[Int]

Inherited from Immutable

Inherited from parallel.ParSeq[Int]

Inherited from ParSeqLike[Int, ParSeq[Int], immutable.Seq[Int]]

Inherited from parallel.ParIterable[Int]

Inherited from Parallel

Inherited from CustomParallelizable[Int, ParSeq[Int]]

Inherited from GenericParTemplate[Int, ParSeq]

Inherited from HasNewCombiner[Int, scala.collection.parallel.immutable.ParSeq[Int] @scala.annotation.unchecked.uncheckedVariance]

Inherited from GenSeq[Int]

Inherited from GenIterable[Int]

Inherited from GenTraversable[Int]

Inherited from HasNewBuilder[Int, scala.collection.parallel.immutable.ParSeq[Int] @scala.annotation.unchecked.uncheckedVariance]

Inherited from GenSeqLike[Int, ParSeq[Int]]

Inherited from Equals

Inherited from GenIterableLike[Int, ParSeq[Int]]

Inherited from GenTraversableLike[Int, ParSeq[Int]]

Inherited from Parallelizable[Int, ParSeq[Int]]

Inherited from GenTraversableOnce[Int]

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion traversable2ops from ParRange to TraversableOps[Int]

Inherited by implicit conversion any2stringadd from ParRange to StringAdd

Inherited by implicit conversion any2stringfmt from ParRange to StringFormat

Inherited by implicit conversion any2ArrowAssoc from ParRange to ArrowAssoc[ParRange]

Inherited by implicit conversion any2Ensuring from ParRange to Ensuring[ParRange]

Ungrouped