scala.collection.parallel

ParMapLike

trait ParMapLike[K, +V, +Repr <: ParMapLike[K, V, Repr, Sequential] with ParMap[K, V], +Sequential <: Map[K, V] with MapLike[K, V, Sequential]] extends GenMapLike[K, V, Repr] with ParIterableLike[(K, V), Repr, Sequential]

A template trait for mutable parallel maps. This trait is to be mixed in with concrete parallel maps to override the representation type.

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.

K

the key type of the map

V

the value type of the map

Self Type
ParMapLike[K, V, Repr, Sequential]
Source
ParMapLike.scala
Since

2.9

Linear Supertypes
ParIterableLike[(K, V), Repr, Sequential], HasNewCombiner[(K, V), Repr], Parallel, CustomParallelizable[(K, V), Repr], GenMapLike[K, V, Repr], Equals, GenIterableLike[(K, V), Repr], GenTraversableLike[(K, V), Repr], Parallelizable[(K, V), Repr], GenTraversableOnce[(K, V)], AnyRef, Any
Known Subclasses
Ordering
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Inherited
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  1. ParMapLike
  2. ParIterableLike
  3. HasNewCombiner
  4. Parallel
  5. CustomParallelizable
  6. GenMapLike
  7. Equals
  8. GenIterableLike
  9. GenTraversableLike
  10. Parallelizable
  11. GenTraversableOnce
  12. AnyRef
  13. Any
Visibility
  1. Public
  2. All

Type Members

  1. trait Accessor[R, Tp] extends StrictSplitterCheckTask[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]
  3. trait BuilderOps[Elem, To] extends AnyRef

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

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

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

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

    Attributes
    protected[this]
  8. class Count extends Accessor[Int, Count]

    Attributes
    protected[this]
  9. class CreateScanTree[U >: T] extends Transformer[ScanTree[U], CreateScanTree[U]]

    Attributes
    protected[this]
  10. class Drop[U >: T, This >: Repr] extends Transformer[Combiner[U, This], Drop[U, This]]

    Attributes
    protected[this]
  11. class Exists extends Accessor[Boolean, Exists]

    Attributes
    protected[this]
  12. class Filter[U >: T, This >: Repr] extends Transformer[Combiner[U, This], Filter[U, This]]

    Attributes
    protected[this]
  13. class FilterNot[U >: T, This >: Repr] extends Transformer[Combiner[U, This], FilterNot[U, This]]

    Attributes
    protected[this]
  14. class Find[U >: T] extends Accessor[Option[U], Find[U]]

    Attributes
    protected[this]
  15. class FlatMap[S, That] extends Transformer[Combiner[S, That], FlatMap[S, That]]

    Attributes
    protected[this]
  16. class Fold[U >: T] extends Accessor[U, Fold[U]]

    Attributes
    protected[this]
  17. class Forall extends Accessor[Boolean, Forall]

    Attributes
    protected[this]
  18. class Foreach[S] extends Accessor[Unit, Foreach[S]]

    Attributes
    protected[this]
  19. class FromScanTree[U >: T, That] extends StrictSplitterCheckTask[Combiner[U, That], FromScanTree[U, That]]

    Attributes
    protected[this]
  20. class GroupBy[K, U >: T] extends Transformer[HashMapCombiner[K, U], GroupBy[K, U]]

    Attributes
    protected[this]
  21. class Map[S, That] extends Transformer[Combiner[S, That], Map[S, That]]

    Attributes
    protected[this]
  22. class Max[U >: T] extends Accessor[Option[U], Max[U]]

    Attributes
    protected[this]
  23. class Min[U >: T] extends Accessor[Option[U], Min[U]]

    Attributes
    protected[this]
  24. trait NonDivisible[R] extends NonDivisibleTask[R, NonDivisible[R]]

    Attributes
    protected[this]
  25. trait NonDivisibleTask[R, Tp] extends StrictSplitterCheckTask[R, Tp]

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

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

  27. trait ParIterator extends IterableSplitter[T]

    Parallel iterators are split iterators that have additional accessor and transformer methods defined in terms of methods next and hasNext.

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

    Attributes
    protected[this]
  29. class Product[U >: T] extends Accessor[U, Product[U]]

    Attributes
    protected[this]
  30. class Reduce[U >: T] extends Accessor[Option[U], Reduce[U]]

    Attributes
    protected[this]
  31. abstract class ResultMapping[R, Tp, R1] extends NonDivisibleTask[R1, ResultMapping[R, Tp, R1]]

    Attributes
    protected[this]
  32. type SSCTask[R, Tp] = StrictSplitterCheckTask[R, Tp]

    Definition Classes
    ParIterableLike
  33. 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 Product with Serializable

    Attributes
    protected[this]
  34. case class ScanNode[U >: T](left: ScanTree[U], right: ScanTree[U]) extends ScanTree[U] with Product with Serializable

    Attributes
    protected[this]
  35. trait ScanTree[U >: T] extends AnyRef

    Attributes
    protected[this]
  36. abstract class SeqComposite[FR, SR, R, First <: ParIterableLike.this.StrictSplitterCheckTask[FR, _], Second <: ParIterableLike.this.StrictSplitterCheckTask[SR, _]] extends Composite[FR, SR, R, First, Second]

    Sequentially performs one task after another.

  37. trait SignalContextPassingIterator[+IterRepr <: ParIterator] extends ParIterator

    A stackable modification that ensures signal contexts get passed along the iterators.

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

  39. class Slice[U >: T, This >: Repr] extends Transformer[Combiner[U, This], Slice[U, This]]

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

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

    Attributes
    protected[this]
  42. trait StrictSplitterCheckTask[R, Tp] extends Task[R, Tp]

    Attributes
    protected
  43. class Sum[U >: T] extends Accessor[U, Sum[U]]

    Attributes
    protected[this]
  44. class Take[U >: T, This >: Repr] extends Transformer[Combiner[U, This], Take[U, This]]

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

    Attributes
    protected[this]
  46. trait TaskOps[R, Tp] extends AnyRef

  47. class ToParCollection[U >: T, That] extends Transformer[Combiner[U, That], ToParCollection[U, That]]

    Attributes
    protected[this]
  48. class ToParMap[K, V, That] extends Transformer[Combiner[(K, V), That], ToParMap[K, V, That]]

    Attributes
    protected[this]
  49. trait Transformer[R, Tp] extends Accessor[R, Tp]

    Attributes
    protected
  50. class Zip[U >: T, S, That] extends Transformer[Combiner[(U, S), That], Zip[U, S, That]]

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

    Attributes
    protected[this]

Abstract Value Members

  1. abstract def +[B1 >: V](kv: (K, B1)): GenMap[K, B1]

    Definition Classes
    GenMapLike
  2. abstract def -(key: K): Repr

    Definition Classes
    GenMapLike
  3. abstract def empty: Repr

  4. abstract def get(key: K): Option[V]

    Definition Classes
    GenMapLike
  5. abstract def newCombiner: Combiner[(K, V), Repr]

    Attributes
    protected[this]
    Definition Classes
    HasNewCombiner
  6. abstract def seq: Sequential

  7. abstract def size: Int

    The size of this general map.

    The size of this general map.

    Note: will not terminate for infinite-sized collections.

    returns

    the number of elements in this general map.

    Definition Classes
    GenTraversableLikeGenTraversableOnce
  8. abstract def splitter: IterableSplitter[(K, V)]

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

    Creates a new parallel iterator used to traverse the elements of this parallel collection. This iterator is more specific than the iterator of the returned by iterator, and augmented with additional accessor and transformer methods.

    returns

    a parallel iterator

    Attributes
    protected[parallel]
    Definition Classes
    ParIterableLike
  9. abstract 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 general map. By default the string prefix is the simple name of the collection class general map.

    Definition Classes
    GenTraversableLike

Concrete 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.

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

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  4. abstract def ++[B](that: GenTraversableOnce[B]): GenMap[B]

    [use case] Returns a new general map containing the elements from the left hand operand followed by the elements from the right hand operand.

    [use case]

    Returns a new general map containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the general map is the most specific superclass encompassing the element types of the two operands (see example).

    B

    the element type of the returned collection.

    that

    the traversable to append.

    returns

    a new collection of type That which contains all elements of this general map followed by all elements of that.

    Definition Classes
    GenTraversableLike
  5. def ++[U >: (K, V), That](that: GenTraversableOnce[U])(implicit bf: CanBuildFrom[Repr, U, That]): That

    Returns a new general map containing the elements from the left hand operand followed by the elements from the right hand operand.

    Returns a new general map containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the general map is the most specific superclass encompassing the element types of the two operands (see example).

    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)
    
    That

    the class of the returned collection. Where possible, That is the same class as the current collection class Repr, but this depends on the element type B being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, B, That] is found.

    that

    the traversable to append.

    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

    a new collection of type That which contains all elements of this general map followed by all elements of that.

    Definition Classes
    ParIterableLikeGenTraversableLike
  6. def /:[S](z: S)(op: (S, (K, V)) ⇒ S): S

    Applies a binary operator to a start value and all elements of this general map, going left to right.

    Applies a binary operator to a start value and all elements of this general map, 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 general map, going left to right with the start value z on the left:

                op(...op(op(z, x1), x2), ..., xn)
    

    where x1, ..., xn are the elements of this general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  7. def /:\[A1 >: (K, V)](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
  8. def :\[S](z: S)(op: ((K, V), S) ⇒ S): S

    Applies a binary operator to all elements of this general map and a start value, going right to left.

    Applies a binary operator to all elements of this general map 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 general map, going right to left with the start value z on the right:

                op(x1, op(x2, ... op(xn, z)...))
    

    where x1, ..., xn are the elements of this general map.

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

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

    Test two objects for equality.

    Test two objects for equality.

    returns

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

    Definition Classes
    Any
  11. def aggregate[S](z: S)(seqop: (S, (K, V)) ⇒ 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
  12. def apply(key: K): V

    Definition Classes
    ParMapLikeGenMapLike
  13. 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.

  14. def bf2seq[S, That](bf: CanBuildFrom[Repr, S, That]): CanBuildFrom[Sequential, S, That]

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

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

    Definition Classes
    ParIterableLike
  17. def cbfactory: () ⇒ Combiner[(K, V), Repr]

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  18. 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[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()
    Note

    not specified by SLS as a member of AnyRef

  19. abstract def collect[B](pf: PartialFunction[(K, V), B]): GenMap[B]

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

    [use case]

    Builds a new collection by applying a partial function to all elements of this general map on which the function is defined.

    B

    the element type of the returned collection.

    pf

    the partial function which filters and maps the general map.

    returns

    a new collection of type That resulting from applying the partial function pf to each element on which it is defined and collecting the results. The order of the elements is preserved.

    Definition Classes
    GenTraversableLike
  20. def collect[S, That](pf: PartialFunction[(K, V), S])(implicit bf: CanBuildFrom[Repr, S, That]): That

    Builds a new collection by applying a partial function to all elements of this general map on which the function is defined.

    Builds a new collection by applying a partial function to all elements of this general map on which the function is defined.

    That

    the class of the returned collection. Where possible, That is the same class as the current collection class Repr, but this depends on the element type B being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, B, That] is found.

    pf

    the partial function which filters and maps the general map.

    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

    a new collection of type That resulting from applying the 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
  21. def copyToArray[U >: (K, V)](xs: Array[U], start: Int, len: Int): Unit

    Definition Classes
    ParIterableLikeGenTraversableOnce
  22. abstract def copyToArray(xs: Array[(K, V)], start: Int): Unit

    [use case] Copies values of this general map to an array.

    [use case]

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

    xs

    the array to fill.

    start

    the starting index.

    Definition Classes
    GenTraversableOnce
  23. def copyToArray[U >: (K, V)](xs: Array[U], start: Int): Unit

    Copies values of this general map to an array.

    Copies values of this general map to an array. Fills the given array xs with values of this general map, beginning at index start. Copying will stop once either the end of the current general map 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
  24. abstract def copyToArray(xs: Array[(K, V)]): Unit

    [use case] Copies values of this general map to an array.

    [use case]

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

    xs

    the array to fill.

    Definition Classes
    GenTraversableOnce
  25. def copyToArray[U >: (K, V)](xs: Array[U]): Unit

    Copies values of this general map to an array.

    Copies values of this general map to an array. Fills the given array xs with values of this general map. Copying will stop once either the end of the current general map 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
  26. def count(p: ((K, V)) ⇒ Boolean): Int

    Counts the number of elements in the general map which satisfy a predicate.

    Counts the number of elements in the general map which satisfy a predicate.

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

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

    Definition Classes
    ParIterableLike
  28. def default(key: K): V

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

    Attributes
    protected
    Definition Classes
    ParIterableLike
  30. def drop(n: Int): Repr

    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 general map.

    returns

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

    Definition Classes
    ParIterableLikeGenTraversableLike
  31. def dropWhile(pred: ((K, V)) ⇒ Boolean): Repr

    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 general map that satisfy the predicate pred

    Definition Classes
    ParIterableLikeGenTraversableLike
  32. 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
  33. def equals(that: Any): Boolean

    Compares two maps structurally; i.

    Compares two maps structurally; i.e. checks if all mappings contained in this map are also contained in the other map, and vice versa.

    that

    the other map

    returns

    true if both maps contain exactly the same mappings, false otherwise.

    Definition Classes
    GenMapLikeEquals → AnyRef → Any
  34. def exists(pred: ((K, V)) ⇒ Boolean): Boolean

    Tests whether a predicate holds for some element of this general map.

    Tests whether a predicate holds for some element of this general map.

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

    returns

    true if p holds for some element, false otherwise

    Definition Classes
    ParIterableLikeGenTraversableOnce
  35. def filter(pred: ((K, V)) ⇒ Boolean): Repr

    Selects all elements of this general map which satisfy a predicate.

    Selects all elements of this general map which satisfy a predicate.

    returns

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

    Definition Classes
    ParIterableLikeGenTraversableLike
  36. def filterNot(pred: ((K, V)) ⇒ Boolean): Repr

    Selects all elements of this general map which do not satisfy a predicate.

    Selects all elements of this general map which do not satisfy a predicate.

    returns

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

    Definition Classes
    ParIterableLikeGenTraversableLike
  37. 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[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()
    Note

    not specified by SLS as a member of AnyRef

  38. def find(pred: ((K, V)) ⇒ Boolean): Option[(K, V)]

    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.

    returns

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

    Definition Classes
    ParIterableLikeGenTraversableOnce
  39. abstract def flatMap[B](f: ((K, V)) ⇒ GenTraversableOnce[B]): GenMap[B]

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

    [use case]

    Builds a new collection by applying a function to all elements of this general map and using the elements of the resulting collections. For example:

    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

    a new collection of type That resulting from applying the given collection-valued function f to each element of this general map and concatenating the results.

    Definition Classes
    GenTraversableLike
  40. def flatMap[S, That](f: ((K, V)) ⇒ GenTraversableOnce[S])(implicit bf: CanBuildFrom[Repr, S, That]): That

    Builds a new collection by applying a function to all elements of this general map and using the elements of the resulting collections.

    Builds a new collection by applying a function to all elements of this general map 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 general map. 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)
    
    That

    the class of the returned collection. Where possible, That is the same class as the current collection class Repr, but this depends on the element type B being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, B, That] is found.

    f

    the function to apply to each 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

    a new collection of type That resulting from applying the given collection-valued function f to each element of this general map and concatenating the results.

    Definition Classes
    ParIterableLikeGenTraversableLike
  41. def fold[U >: (K, V)](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
  42. def foldLeft[S](z: S)(op: (S, (K, V)) ⇒ S): S

    Applies a binary operator to a start value and all elements of this general map, going left to right.

    Applies a binary operator to a start value and all elements of this general map, 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 general map, going left to right with the start value z on the left:

                op(...op(z, x1), x2, ..., xn)
    

    where x1, ..., xn are the elements of this general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  43. def foldRight[S](z: S)(op: ((K, V), S) ⇒ S): S

    Applies a binary operator to all elements of this general map and a start value, going right to left.

    Applies a binary operator to all elements of this general map 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 general map, going right to left with the start value z on the right:

                op(x1, op(x2, ... op(xn, z)...))
    

    where x1, ..., xn are the elements of this general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  44. def forall(pred: ((K, V)) ⇒ Boolean): Boolean

    Tests whether a predicate holds for all elements of this general map.

    Tests whether a predicate holds for all elements of this general map.

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

    returns

    true if p holds for all elements, false otherwise

    Definition Classes
    ParIterableLikeGenTraversableOnce
  45. def foreach[U](f: ((K, V)) ⇒ U): Unit

    Applies a function f to all the elements of general map in a sequential order.

    Applies a function f to all the elements of general map in a sequential 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
  46. final def getClass(): java.lang.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

  47. def groupBy[K](f: ((K, V)) ⇒ K): ParMap[K, Repr]

    Partitions this general map into a map of general maps according to some discriminator function.

    Partitions this general map into a map of general maps 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 general map.

    K

    the type of keys returned by the discriminator function.

    f

    the discriminator function.

    returns

    A map from keys to general maps 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 general map of those elements x for which f(x) equals k.

    Definition Classes
    ParIterableLikeGenTraversableLike
  48. def hasDefiniteSize: Boolean

    Definition Classes
    ParIterableLikeGenTraversableOnce
  49. def hashCode(): Int

    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in Any.

    returns

    the hash code value for this object.

    Definition Classes
    GenMapLike → AnyRef → Any
  50. def head: (K, V)

    Definition Classes
    GenIterableLikeGenTraversableLike
  51. def isEmpty: Boolean

    Tests whether the general map is empty.

    Tests whether the general map is empty.

    returns

    true if the general map contains no elements, false otherwise.

    Definition Classes
    GenIterableLikeGenTraversableOnce
  52. 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
  53. 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
  54. final def isTraversableAgain: Boolean

    Tests whether this general map can be repeatedly traversed.

    Tests whether this general map can be repeatedly traversed.

    returns

    true

    Definition Classes
    GenTraversableLikeGenTraversableOnce
  55. def iterator: Splitter[(K, V)]

    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
    ParIterableLikeGenIterableLike
  56. abstract def map[B](f: ((K, V)) ⇒ B): GenMap[B]

    [use case] Builds a new collection by applying a function to all elements of this general map.

    [use case]

    Builds a new collection by applying a function to all elements of this general map.

    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

    a new collection of type That resulting from applying the given function f to each element of this general map and collecting the results.

    Definition Classes
    GenTraversableLike
  57. def map[S, That](f: ((K, V)) ⇒ S)(implicit bf: CanBuildFrom[Repr, S, That]): That

    Builds a new collection by applying a function to all elements of this general map.

    Builds a new collection by applying a function to all elements of this general map.

    That

    the class of the returned collection. Where possible, That is the same class as the current collection class Repr, but this depends on the element type B being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, B, That] is found.

    f

    the function to apply to each 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

    a new collection of type That resulting from applying the given function f to each element of this general map and collecting the results.

    Definition Classes
    ParIterableLikeGenTraversableLike
  58. abstract def max: (K, V)

    [use case] Finds the largest element.

    [use case]

    Finds the largest element.

    returns

    the largest element of this general map with respect to the ordering cmp.

    Definition Classes
    GenTraversableOnce
  59. def max[U >: (K, V)](implicit ord: Ordering[U]): (K, V)

    Finds the largest element.

    Finds the largest element.

    returns

    the largest element of this general map with respect to the ordering cmp.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  60. def maxBy[S](f: ((K, V)) ⇒ S)(implicit cmp: Ordering[S]): (K, V)

    Definition Classes
    ParIterableLikeGenTraversableOnce
  61. abstract def min: (K, V)

    [use case] Finds the smallest element.

    [use case]

    Finds the smallest element.

    returns

    the smallest element of this general map with respect to the ordering cmp.

    Definition Classes
    GenTraversableOnce
  62. def min[U >: (K, V)](implicit ord: Ordering[U]): (K, V)

    Finds the smallest element.

    Finds the smallest element.

    returns

    the smallest element of this general map with respect to the ordering cmp.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  63. def minBy[S](f: ((K, V)) ⇒ S)(implicit cmp: Ordering[S]): (K, V)

    Definition Classes
    ParIterableLikeGenTraversableOnce
  64. def mkString: String

    Displays all elements of this general map in a string.

    Displays all elements of this general map in a string.

    returns

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

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

    Displays all elements of this general map in a string using a separator string.

    Displays all elements of this general map in a string using a separator string.

    sep

    the separator string.

    returns

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

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

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

    Displays all elements of this general map in a string using start, end, and separator strings.

    Displays all elements of this general map 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 general map. 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 general map are separated by the string sep.

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

  67. 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
  68. def nonEmpty: Boolean

    Tests whether the general map is not empty.

    Tests whether the general map is not empty.

    returns

    true if the general map contains at least one element, false otherwise.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  69. 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

  70. 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

  71. def par: Repr

    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
  72. def parCombiner: Combiner[(K, V), Repr]

    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
  73. def partition(pred: ((K, V)) ⇒ Boolean): (Repr, Repr)

    Partitions this general map in two general maps according to a predicate.

    Partitions this general map in two general maps according to a predicate.

    returns

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

    Definition Classes
    ParIterableLikeGenTraversableLike
  74. abstract def product: (K, V)

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

    [use case]

    Multiplies up the elements of this collection.

    returns

    the product of all elements of this general map with respect to the * operator in num.

    Definition Classes
    GenTraversableOnce
  75. def product[U >: (K, V)](implicit num: Numeric[U]): U

    Multiplies up the elements of this collection.

    Multiplies up the elements of this collection.

    num

    an implicit parameter defining a set of numeric operations which includes the * operator to be used in forming the product.

    returns

    the product of all elements of this general map with respect to the * operator in num.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  76. def reduce[U >: (K, V)](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 general map is empty.

  77. def reduceLeft[U >: (K, V)](op: (U, (K, V)) ⇒ U): U

    Definition Classes
    ParIterableLike
  78. def reduceLeftOption[U >: (K, V)](op: (U, (K, V)) ⇒ U): Option[U]

    Optionally applies a binary operator to all elements of this general map, going left to right.

    Optionally applies a binary operator to all elements of this general map, 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 general map is nonempty, None otherwise.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  79. def reduceOption[U >: (K, V)](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
  80. def reduceRight[U >: (K, V)](op: ((K, V), U) ⇒ U): U

    Applies a binary operator to all elements of this general map, going right to left.

    Applies a binary operator to all elements of this general map, 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 general map, going right to left:

                op(x,,1,,, op(x,,2,,, ..., op(x,,n-1,,, x,,n,,)...))
    

    where x1, ..., xn are the elements of this general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
    Exceptions thrown
    `UnsupportedOperationException`

    if this general map is empty.

  81. def reduceRightOption[U >: (K, V)](op: ((K, V), U) ⇒ U): Option[U]

    Optionally applies a binary operator to all elements of this general map, going right to left.

    Optionally applies a binary operator to all elements of this general map, 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 general map is nonempty, None otherwise.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  82. def repr: Repr

    Definition Classes
    ParIterableLikeGenTraversableLike
  83. 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
  84. abstract def sameElements(that: GenIterable[(K, V)]): Boolean

    [use case] Checks if the other iterable collection contains the same elements in the same order as this general map.

    [use case]

    Checks if the other iterable collection contains the same elements in the same order as this general map.

    that

    the collection to compare with.

    returns

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

    Definition Classes
    GenIterableLike
  85. def sameElements[U >: (K, V)](that: GenIterable[U]): Boolean

    Checks if the other iterable collection contains the same elements in the same order as this general map.

    Checks if the other iterable collection contains the same elements in the same order as this general map.

    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
    ParIterableLikeGenIterableLike
  86. abstract def scan(z: (K, V))(op: ((K, V), (K, V)) ⇒ (K, V)): GenMap[(K, V)]

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

    [use case]

    Computes a prefix scan of the elements of the collection.

    z

    neutral element for the operator op

    op

    the associative operator for the scan

    returns

    a collection containing the prefix scan of the elements in the original collection

    Definition Classes
    ParIterableLike
  87. def scan[U >: (K, V), That](z: U)(op: (U, U) ⇒ U)(implicit bf: CanBuildFrom[Repr, U, That]): That

    Computes a prefix scan of the elements of the collection.

    Computes a prefix scan of the elements of the collection.

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

    U

    element type of the resulting collection

    That

    type of the resulting collection

    z

    neutral element for the operator op

    op

    the associative operator for the scan

    returns

    a collection containing the prefix scan of the elements in the original collection

    Definition Classes
    ParIterableLikeGenTraversableLike
  88. def scanBlockSize: Int

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  89. def scanLeft[S, That](z: S)(op: (S, (K, V)) ⇒ S)(implicit bf: CanBuildFrom[Repr, S, That]): That

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

    Produces a collection containing cummulative 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
  90. def scanRight[S, That](z: S)(op: ((K, V), S) ⇒ S)(implicit bf: CanBuildFrom[Repr, S, That]): That

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

    Produces a collection containing cummulative results of applying the operator going right to left. The head of the collection is the last cummulative 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
  91. def sequentially[S, That <: Parallel](b: (Sequential) ⇒ Parallelizable[S, That]): Repr

    Attributes
    protected[this]
    Definition Classes
    ParIterableLike
  92. def slice(unc_from: Int, unc_until: Int): Repr

    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.

    returns

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

    Definition Classes
    ParIterableLikeGenTraversableLike
  93. def span(pred: ((K, V)) ⇒ Boolean): (Repr, Repr)

    Splits this general map into a prefix/suffix pair according to a predicate.

    Splits this general map 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
  94. def splitAt(n: Int): (Repr, Repr)

    Splits this general map into two at a given position.

    Splits this general map 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 general maps consisting of the first n elements of this general map, and the other elements.

    Definition Classes
    ParIterableLikeGenTraversableLike
  95. abstract def sum: (K, V)

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

    [use case]

    Sums up the elements of this collection.

    returns

    the sum of all elements of this general map with respect to the + operator in num.

    Definition Classes
    GenTraversableOnce
  96. def sum[U >: (K, V)](implicit num: Numeric[U]): U

    Sums up the elements of this collection.

    Sums up the elements of this collection.

    num

    an implicit parameter defining a set of numeric operations which includes the + operator to be used in forming the sum.

    returns

    the sum of all elements of this general map with respect to the + operator in num.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  97. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef
  98. def tail: Repr

    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 general map consisting of all elements of this general map except the first one.

    Definition Classes
    GenTraversableLike
    Exceptions thrown
    `UnsupportedOperationException`

    if the general map is empty.

  99. def take(n: Int): Repr

    Selects first n elements.

    Selects first n elements.

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

    n

    Tt number of elements to take from this general map.

    returns

    a general map consisting only of the first n elements of this general map, or else the whole general map, if it has less than n elements.

    Definition Classes
    ParIterableLikeGenTraversableLike
  100. def takeWhile(pred: ((K, V)) ⇒ Boolean): Repr

    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 general map of elements that satisy the predicate pred

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

    Attributes
    protected
    Definition Classes
    ParIterableLike
  102. def threshold(sz: Int, p: Int): Int

    Some minimal number of elements after which this collection should be handled sequentially by different processors.

    Some minimal number of elements after which this collection should be handled sequentially by different processors.

    This method depends on the size of the collection and the parallelism level, which are both specified as arguments.

    sz

    the size based on which to compute the threshold

    p

    the parallelism level based on which to compute the threshold

    returns

    the maximum number of elements for performing operations sequentially

    Definition Classes
    ParIterableLike
  103. abstract def toArray: Array[(K, V)]

    [use case] Converts this general map to an array.

    [use case]

    Converts this general map to an array.

    Note: will not terminate for infinite-sized collections.

    returns

    an array containing all elements of this general map.

    Definition Classes
    GenTraversableOnce
  104. def toArray[U >: (K, V)](implicit arg0: ClassManifest[U]): Array[U]

    Converts this general map to an array.

    Converts this general map to an array.

    Note: will not terminate for infinite-sized collections.

    returns

    an array containing all elements of this general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  105. def toBuffer[U >: (K, V)]: Buffer[U]

    Converts this general map to a mutable buffer.

    Converts this general map to a mutable buffer.

    Note: will not terminate for infinite-sized collections.

    returns

    a buffer containing all elements of this general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  106. def toIndexedSeq[U >: (K, V)]: IndexedSeq[U]

    Converts this general map to an indexed sequence.

    Converts this general map to an indexed sequence.

    Note: will not terminate for infinite-sized collections.

    returns

    an indexed sequence containing all elements of this general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  107. def toIterable: ParIterable[(K, V)]

    Converts this general map to an iterable collection.

    Converts this general map 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 general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  108. def toIterator: Iterator[(K, V)]

    Returns an Iterator over the elements in this general map.

    Returns an Iterator over the elements in this general map. 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 general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  109. def toList: List[(K, V)]

    Converts this general map to a list.

    Converts this general map to a list.

    Note: will not terminate for infinite-sized collections.

    returns

    a list containing all elements of this general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  110. abstract def toMap[T, U]: Map[T, U]

    [use case] Converts this general map to a map.

    [use case]

    Converts this general map 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 containing all elements of this general map.

    Definition Classes
    GenTraversableOnce
  111. def toMap[K, V](implicit ev: <:<[(K, V), (K, V)]): ParMap[K, V]

    Converts this general map to a map.

    Converts this general map 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 containing all elements of this general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  112. def toParCollection[U >: (K, V), That](cbf: () ⇒ Combiner[U, That]): That

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

    Attributes
    protected
    Definition Classes
    ParIterableLike
  114. def toSeq: ParSeq[(K, V)]

    Converts this general map to a sequence.

    Converts this general map 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 general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  115. def toSet[U >: (K, V)]: ParSet[U]

    Converts this general map to a set.

    Converts this general map to a set.

    Note: will not terminate for infinite-sized collections.

    returns

    a set containing all elements of this general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  116. def toStream: Stream[(K, V)]

    Converts this general map to a stream.

    Converts this general map to a stream.

    Note: will not terminate for infinite-sized collections.

    returns

    a stream containing all elements of this general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  117. 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
    ParIterableLike → AnyRef → Any
  118. def toTraversable: GenTraversable[(K, V)]

    Converts this general map to an unspecified Traversable.

    Converts this general map 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 general map.

    Definition Classes
    ParIterableLikeGenTraversableOnce
  119. def view: ParIterableView[(K, V), Repr, Sequential]

    Definition Classes
    ParIterableLike
  120. final def wait(): Unit

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

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

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

    Attributes
    protected
    Definition Classes
    ParIterableLike
  124. abstract def zip[B](that: GenIterable[B]): GenMap[((K, V), B)]

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

    [use case]

    Returns a general map formed from this general map 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.

    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 collection of type That containing pairs consisting of corresponding elements of this general map and that. The length of the returned collection is the minimum of the lengths of this general map and that.

    Definition Classes
    GenIterableLike
  125. def zip[U >: (K, V), S, That](that: GenIterable[S])(implicit bf: CanBuildFrom[Repr, (U, S), That]): That

    Returns a general map formed from this general map and another iterable collection by combining corresponding elements in pairs.

    Returns a general map formed from this general map 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.

    That

    the class of the returned collection. Where possible, That is the same class as the current collection class Repr, but this depends on the element type (A1, B) being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, (A1, B), That]. is found.

    that

    The iterable providing the second half of each result pair

    bf

    an implicit value of class CanBuildFrom which determines the result class That from the current representation type Repr and the new element type (A1, B).

    returns

    a new collection of type That containing pairs consisting of corresponding elements of this general map and that. The length of the returned collection is the minimum of the lengths of this general map and that.

    Definition Classes
    ParIterableLikeGenIterableLike
  126. abstract def zipAll[B](that: Iterable[B], thisElem: (K, V), thatElem: B): GenMap[((K, V), B)]

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

    [use case]

    Returns a general map formed from this general map 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.

    that

    the iterable providing the second half of each result pair

    thisElem

    the element to be used to fill up the result if this general map is shorter than that.

    thatElem

    the element to be used to fill up the result if that is shorter than this general map.

    returns

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

    Definition Classes
    GenIterableLike
  127. def zipAll[S, U >: (K, V), That](that: GenIterable[S], thisElem: U, thatElem: S)(implicit bf: CanBuildFrom[Repr, (U, S), That]): That

    Returns a general map formed from this general map and another iterable collection by combining corresponding elements in pairs.

    Returns a general map formed from this general map 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.

    that

    the iterable providing the second half of each result pair

    thisElem

    the element to be used to fill up the result if this general map is shorter than that.

    thatElem

    the element to be used to fill up the result if that is shorter than this general map.

    returns

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

    Definition Classes
    ParIterableLikeGenIterableLike
  128. abstract def zipWithIndex: GenMap[((K, V), Int)]

    [use case] Zips this general map with its indices.

    [use case]

    Zips this general map with its indices.

    returns

    A new collection of type That containing pairs consisting of all elements of this general map paired with their index. Indices start at 0.

    Definition Classes
    GenIterableLike
  129. def zipWithIndex[U >: (K, V), That](implicit bf: CanBuildFrom[Repr, (U, Int), That]): That

    Zips this general map with its indices.

    Zips this general map with its indices.

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

    That

    the class of the returned collection. Where possible, That is the same class as the current collection class Repr, but this depends on the element type (A1, Int) being admissible for that class, which means that an implicit instance of type CanBuildFrom[Repr, (A1, Int), That]. is found.

    returns

    A new collection of type That containing pairs consisting of all elements of this general map paired with their index. Indices start at 0.

    Definition Classes
    ParIterableLikeGenIterableLike

Inherited from ParIterableLike[(K, V), Repr, Sequential]

Inherited from HasNewCombiner[(K, V), Repr]

Inherited from Parallel

Inherited from CustomParallelizable[(K, V), Repr]

Inherited from GenMapLike[K, V, Repr]

Inherited from Equals

Inherited from GenIterableLike[(K, V), Repr]

Inherited from GenTraversableLike[(K, V), Repr]

Inherited from Parallelizable[(K, V), Repr]

Inherited from GenTraversableOnce[(K, V)]

Inherited from AnyRef

Inherited from Any