scala.collection.parallel.mutable
Standard accessor task that iterates over the elements of the collection.
Used to iterate elements using indices
Performs two tasks in parallel, and waits for both to finish.
An iterator that can be split into arbitrary subsets of iterators.
Sequentially performs one task after another.
A stackable modification that ensures signal contexts get passed along the iterators.
Test two objects for inequality.
Test two objects for inequality.
true if !(this == that), false otherwise.
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.
a hash value consistent with ==
[use case]
the element type of the returned collection.
the traversable to append.
a new collection of type That which contains all elements
of this parallel array
followed by all elements of that.
[use case]
the prepended element
a new collection of type That consisting of elem followed
by all elements of this parallel array
.
Applies a binary operator to a start value and all elements of this parallel array , going left to right.
Applies a binary operator to a start value and all elements of this parallel array , 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.
the start value.
the binary operator.
the result of inserting op between consecutive elements of this parallel array
,
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 parallel array
.
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
[use case]
the appended element
a new collection of type That consisting of
all elements of this parallel array
followed by elem.
Applies a binary operator to all elements of this parallel array and a start value, going right to left.
Applies a binary operator to all elements of this parallel array 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
the start value
the binary operator
the result of inserting op between consecutive elements of this parallel array
,
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 parallel array
.
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).
true if the receiver object is equivalent to the argument; false otherwise.
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).
the type of accumulated results
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)
an operator used to accumulate results within a partition
an associative operator used to combine results from different partitions
Selects an element by its index in the parallel array .
Selects an element by its index in the parallel array .
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
the element of this parallel array
at index idx, where 0 indicates the first element.
if idx does not satisfy 0 <= idx < length.
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.
the receiver object.
if the receiver object is not an instance of the erasure of type T0.
Create a copy of the receiver object.
[use case]
the element type of the returned collection.
the partial function which filters and maps the parallel array .
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.
The factory companion object that builds instances of class ParArray.
The factory companion object that builds instances of class ParArray.
(or its Iterable superclass where class ParArray is not a Seq.)
[use case]
the array to fill.
the starting index.
[use case]
the array to fill.
Tests whether every element of this parallel array relates to the corresponding element of another parallel sequence by satisfying a test predicate.
Tests whether every element of this parallel array 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.
the type of the elements of that
the other parallel sequence
the test predicate, which relates elements from both sequences
true if both parallel sequences have the same length and
p(x, y) is true for all corresponding elements x of this parallel array
and y of that, otherwise false
Counts the number of elements in the parallel array which satisfy a predicate.
Counts the number of elements in the parallel array which satisfy a predicate.
the predicate used to test elements.
the number of elements satisfying the predicate p.
[use case]
the sequence of elements to remove
a new collection of type That which contains all elements of this parallel array
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.
Builds a new parallel array from this parallel array without any duplicate elements.
Builds a new parallel array from this parallel array without any duplicate elements.
Note: will not terminate for infinite-sized collections.
A new parallel array which contains the first occurrence of every element of this parallel array .
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.
the number of elements to drop from this parallel array .
a parallel array
consisting of all elements of this parallel array
except the first n ones, or else the
empty parallel array
, if this parallel array
has less than n elements.
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.
the predicate used to test the elements
a collection composed of all the elements after the longest prefix of elements
in this parallel array
that satisfy the predicate pred
Tests whether this parallel array ends with the given parallel sequence.
Tests whether this parallel array ends with the given parallel sequence.
This method will use abort signalling capabilities. This means
that splitters may send and read abort signals.
the type of the elements of that sequence
the sequence to test
true if this parallel array
has that as a suffix, false otherwise
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:
x and y of type AnyRef, multiple invocations of
x.eq(y) consistently returns true or consistently returns false.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).
true if the argument is a reference to the receiver object; false otherwise.
The equals method for arbitrary sequences.
The equals method for arbitrary sequences. Compares this sequence to some other object.
The object to compare the sequence to
true if that is a sequence that has the same elements as
this sequence in the same order, false otherwise
Tests whether a predicate holds for some element of this parallel array .
Tests whether a predicate holds for some element of this parallel array .
This method will use abort signalling capabilities. This means
that splitters may send and read abort signals.
true if p holds for some element, false otherwise
Selects all elements of this parallel array which satisfy a predicate.
Selects all elements of this parallel array which satisfy a predicate.
a new parallel array
consisting of all elements of this parallel array
that satisfy the given
predicate p. Their order may not be preserved.
Selects all elements of this parallel array which do not satisfy a predicate.
Selects all elements of this parallel array which do not satisfy a predicate.
a new parallel array
consisting of all elements of this parallel array
that do not satisfy the given
predicate p. Their order may not be preserved.
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.
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.
an option value with the element if such an element exists, or None otherwise
[use case]
the element type of the returned collection.
the function to apply to each element.
a new collection of type That resulting from applying the given collection-valued function
f to each element of this parallel array
and concatenating the results.
[use case]
the type of the elements of each traversable collection.
a new parallel array resulting from concatenating all element parallel array s.
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.
a type parameter for the binary operator, a supertype of T.
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)
a binary operator that must be associative
the result of applying fold operator op between all the elements and z
Applies a binary operator to a start value and all elements of this parallel array , going left to right.
Applies a binary operator to a start value and all elements of this parallel array , 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.
the start value.
the binary operator.
the result of inserting op between consecutive elements of this parallel array
,
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 parallel array
.
Applies a binary operator to all elements of this parallel array and a start value, going right to left.
Applies a binary operator to all elements of this parallel array 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.
the start value.
the binary operator.
the result of inserting op between consecutive elements of this parallel array
,
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 parallel array
.
Tests whether a predicate holds for all elements of this parallel array .
Tests whether a predicate holds for all elements of this parallel array .
This method will use abort signalling capabilities. This means
that splitters may send and read abort signals.
true if p holds for all elements, false otherwise
Applies a function f to all the elements of parallel array
in a sequential order.
Applies a function f to all the elements of parallel array
in a sequential order.
the result type of the function applied to each element, which is always discarded
function applied to each element
The generic builder that builds instances of ParArray at arbitrary element types.
The generic builder that builds instances of ParArray at arbitrary element types.
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.
a representation that corresponds to the dynamic class of the receiver object.
not specified by SLS as a member of AnyRef
Partitions this parallel array into a map of parallel array s according to some discriminator function.
Partitions this parallel array into a map of parallel array s 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 parallel array .
the type of keys returned by the discriminator function.
the discriminator function.
A map from keys to parallel array s 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 parallel array
of those elements x
for which f(x) equals k.
Hashcodes for ParArray produce a value from the hashcodes of all the elements of the parallel array .
Hashcodes for ParArray produce a value from the hashcodes of all the elements of the parallel array .
the hash code value for this object.
[use case]
the element value to search for.
the start index
the index >= from of the first element of this parallel array
that is equal (wrt ==)
to elem, or -1, if none exists.
[use case]
the element value to search for.
the index of the first element of this parallel array
that is equal (wrt ==)
to elem, or -1, if none exists.
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.
the predicate used to test the elements
the starting offset for the search
the index >= from of the first element of this parallel array
that satisfies the predicate p,
or -1, if none exists
Finds index of first element satisfying some predicate.
Finds index of first element satisfying some predicate.
Note: may not terminate for infinite-sized collections.
the predicate used to test elements.
the index of the first element of this parallel array
that satisfies the predicate p,
or -1, if none exists.
[use case]
the sequence of elements to intersect with.
a new collection of type That which contains all elements of this parallel array
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.
Tests whether this parallel array contains given index.
Tests whether this parallel array contains given index.
The implementations of methods apply and isDefinedAt turn a Seq[A] into
a PartialFunction[Int, A].
the index to test
true if this parallel array
contains an element at position idx, false otherwise.
Tests whether the parallel array is empty.
Tests whether the parallel array is empty.
true if the parallel array
contains no elements, false otherwise.
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.
true if the receiver object is an instance of erasure of type T0; false otherwise.
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.
Tests whether this parallel array can be repeatedly traversed.
Tests whether this parallel array can be repeatedly traversed.
true
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.
a split iterator
[use case]
the element value to search for.
the end index.
the index <= end of the last element of this parallel array
that is equal (wrt ==)
to elem, or -1, if none exists.
[use case]
the element value to search for.
the index of the last element of this parallel array
that is equal (wrt ==)
to elem, or -1, if none exists.
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.
the predicate used to test the elements
the maximum offset for the search
the index <= end of the first element of this parallel array
that satisfies the predicate p,
or -1, if none exists
Finds index of last element satisfying some predicate.
Finds index of last element satisfying some predicate.
Note: will not terminate for infinite-sized collections.
the predicate used to test elements.
the index of the last element of this parallel array
that satisfies the predicate p,
or -1, if none exists.
The length of the parallel array .
The length of the parallel array .
Note: will not terminate for infinite-sized collections.
Note: xs.length and xs.size yield the same result.
the number of elements in this parallel array .
[use case]
the element type of the returned collection.
the function to apply to each element.
a new collection of type That resulting from applying the given function
f to each element of this parallel array
and collecting the results.
[use case]
the largest element of this parallel array
with respect to the ordering cmp.
[use case]
the smallest element of this parallel array
with respect to the ordering cmp.
Displays all elements of this parallel array in a string.
Displays all elements of this parallel array in a string.
a string representation of this parallel array
. In the resulting string
the string representations (w.r.t. the method toString)
of all elements of this parallel array
follow each other without any
separator string.
Displays all elements of this parallel array in a string using a separator string.
Displays all elements of this parallel array in a string using a separator string.
the separator string.
a string representation of this parallel array
. In the resulting string
the string representations (w.r.t. the method toString)
of all elements of this parallel array
are separated by the string sep.
List(1, 2, 3).mkString("|") = "1|2|3"
Displays all elements of this parallel array in a string using start, end, and separator strings.
Displays all elements of this parallel array in a string using start, end, and separator strings.
the starting string.
the separator string.
the ending string.
a string representation of this parallel array
. 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 parallel array
are separated by
the string sep.
List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"
Equivalent to !(this eq that).
Equivalent to !(this eq that).
true if the argument is not a reference to the receiver object; false otherwise.
The builder that builds instances of type ParArray[A]
The builder that builds instances of type ParArray[A]
Tests whether the parallel array is not empty.
Tests whether the parallel array is not empty.
true if the parallel array
contains at least one element, false otherwise.
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.
not specified by SLS as a member of AnyRef
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.
not specified by SLS as a member of AnyRef
[use case]
the target length
the padding value
a new collection of type That consisting of
all elements of this parallel array
followed by the minimal number of occurrences of elem so
that the resulting collection has a length of at least len.
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.
a parallel implementation of this collection
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.
a combiner for the parallel collection of type ParRepr
Partitions this parallel array in two parallel array s according to a predicate.
Partitions this parallel array in two parallel array s according to a predicate.
a pair of parallel array
s: the first parallel array
consists of all elements that
satisfy the predicate p and the second parallel array
consists of all elements
that don't. The relative order of the elements in the resulting parallel array
s
may not be preserved.
[use case]
the index of the first replaced element
the number of elements to drop in the original parallel array
a new parallel array consisting of all elements of this parallel array
except that replaced elements starting from from are replaced
by patch.
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.
the predicate used to test elements.
the length of the longest prefix of this parallel array
such that every element of the segment satisfies the predicate p.
[use case]
the product of all elements of this parallel array
with respect to the * operator in num.
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.
A type parameter for the binary operator, a supertype of T.
A binary operator that must be associative.
The result of applying reduce operator op between all the elements if the collection is nonempty.
if this parallel array is empty.
Optionally applies a binary operator to all elements of this parallel array , going left to right.
Optionally applies a binary operator to all elements of this parallel array , 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.
the binary operator.
an option value containing the result of reduceLeft(op) is this parallel array
is nonempty,
None otherwise.
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.
A type parameter for the binary operator, a supertype of T.
A binary operator that must be associative.
An option value containing result of applying reduce operator op between all
the elements if the collection is nonempty, and None otherwise.
Applies a binary operator to all elements of this parallel array , going right to left.
Applies a binary operator to all elements of this parallel array , 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.
the binary operator.
the result of inserting op between consecutive elements of this parallel array
,
going right to left:
op(x,,1,,, op(x,,2,,, ..., op(x,,n-1,,, x,,n,,)...))
where x1, ..., xn are the elements of this parallel array
.
if this parallel array is empty.
Optionally applies a binary operator to all elements of this parallel array , going right to left.
Optionally applies a binary operator to all elements of this parallel array , 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.
the binary operator.
an option value containing the result of reduceRight(op) is this parallel array
is nonempty,
None otherwise.
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).
The combiner that is the result of the previous task, or None if there was no previous task.
The new, empty combiner that can be used.
Either newc or oldc.
Returns new parallel array wih elements in reversed order.
Returns new parallel array wih elements in reversed order.
Note: will not terminate for infinite-sized collections.
A new parallel array with all elements of this parallel array in reversed order.
[use case] Note: xs.reverseMap(f) is the same as xs.reverse.map(f) but might be more efficient.
Note: xs.reverseMap(f) is the same as xs.reverse.map(f) but might be more efficient.
the element type of the returned collection.
the function to apply to each element.
a new collection of type That resulting from applying the given function
f to each element of this parallel array
and collecting the results in reversed order.
[use case]
the collection to compare with.
true, if both collections contain the same elements in the same order, false otherwise.
[use case]
neutral element for the operator op
the associative operator for the scan
a collection containing the prefix scan of the elements in the original collection
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.
the actual type of the resulting collection
the initial value
the binary operator applied to the intermediate result and the element
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.
collection with intermediate results
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)
the actual type of the resulting collection
the initial value
the binary operator applied to the intermediate result and the element
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.
collection with intermediate results
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.
the predicate used to test the elements
the starting offset for the search
the length of the longest segment of elements starting at from and
satisfying the predicate
The size of this parallel array .
The size of this parallel array .
Note: will not terminate for infinite-sized collections.
the number of elements in this parallel array .
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.
a parallel array
containing the elements greater than or equal to
index from extending up to (but not including) index until
of this parallel array
.
Splits this parallel array into a prefix/suffix pair according to a predicate.
Splits this parallel array 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.
the predicate used to test the elements
a pair consisting of the longest prefix of the collection for which all
the elements satisfy pred, and the rest of the collection
Splits this parallel array into two at a given position.
Splits this parallel array
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.
the position at which to split.
a pair of parallel array
s consisting of the first n
elements of this parallel array
, and the other elements.
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.
an iterator that can be split into subsets of precise size
Tests whether this parallel array contains the given sequence at a given index.
Tests whether this parallel array 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.
the parallel sequence this sequence is being searched for
the starting offset for the search
true if there is a sequence that starting at offset in this sequence, false otherwise
Tests whether this parallel array starts with the given sequence.
Tests whether this parallel array starts with the given sequence.
the sequence to test
true if this collection has that as a prefix, false otherwise.
Defines the prefix of this object's toString representation.
Defines the prefix of this object's toString representation.
a string representation which starts the result of toString
applied to this parallel array
. By default the string prefix is the
simple name of the collection class parallel array
.
[use case]
the sum of all elements of this parallel array
with respect to the + operator in num.
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.
a parallel array consisting of all elements of this parallel array
except the first one.
if the parallel array is empty.
Selects first n elements.
Selects first n elements.
Note: might return different results for different runs, unless the underlying collection type is ordered.
Tt number of elements to take from this parallel array .
a parallel array
consisting only of the first n elements of this parallel array
,
or else the whole parallel array
, if it has less than n elements.
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.
the predicate used to test the elements
the longest prefix of this parallel array
of elements that satisy the predicate pred
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.
the size based on which to compute the threshold
the parallelism level based on which to compute the threshold
the maximum number of elements for performing operations sequentially
[use case]
an array containing all elements of this parallel array .
Converts this parallel array to a mutable buffer.
Converts this parallel array to a mutable buffer.
Note: will not terminate for infinite-sized collections.
a buffer containing all elements of this parallel array .
Converts this parallel array to an indexed sequence.
Converts this parallel array to an indexed sequence.
Note: will not terminate for infinite-sized collections.
an indexed sequence containing all elements of this parallel array .
Converts this parallel array to an iterable collection.
Converts this parallel array
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.
an Iterable containing all elements of this parallel array
.
Returns an Iterator over the elements in this parallel array .
Returns an Iterator over the elements in this parallel array . Will return the same Iterator if this instance is already an Iterator.
Note: will not terminate for infinite-sized collections.
an Iterator containing all elements of this parallel array .
Converts this parallel array to a list.
Converts this parallel array to a list.
Note: will not terminate for infinite-sized collections.
a list containing all elements of this parallel array .
[use case]
a map containing all elements of this parallel array .
Converts this parallel array to a sequence.
Converts this parallel array
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.
a sequence containing all elements of this parallel array .
Converts this parallel array to a set.
Converts this parallel array to a set.
Note: will not terminate for infinite-sized collections.
a set containing all elements of this parallel array .
Converts this parallel array to a stream.
Converts this parallel array to a stream.
Note: will not terminate for infinite-sized collections.
a stream containing all elements of this parallel array .
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.
a String representation of the object.
Converts this parallel array to an unspecified Traversable.
Converts this parallel array to an unspecified Traversable. Will return the same collection if this instance is already Traversable.
Note: will not terminate for infinite-sized collections.
a Traversable containing all elements of this parallel array .
Transposes this parallel array of traversable collections into a parallel array of parallel array s.
Transposes this parallel array of traversable collections into a parallel array of parallel array s.
the type of the elements of each traversable collection.
an implicit conversion which asserts that the
element type of this parallel array
is a Traversable.
a two-dimensional parallel array of parallel array s which has as nth row the nth column of this parallel array .
(Changed in version 2.9.0) transpose throws an IllegalArgumentException if collections are not uniformly sized.
if all collections in this parallel array
are not of the same size.
[use case]
the sequence to add.
a new collection of type That which contains all elements of this parallel array
followed by all elements of that.
Converts this parallel array of pairs into two collections of the first and second half of each pair.
Converts this parallel array of pairs into two collections of the first and second half of each pair.
an implicit conversion which asserts that the element type of this parallel array is a pair.
a pair parallel array s, containing the first, respectively second half of each element pair of this parallel array .
Converts this parallel array of triples into three collections of the first, second, and third element of each triple.
Converts this parallel array of triples into three collections of the first, second, and third element of each triple.
an implicit conversion which asserts that the element type of this parallel array is a triple.
a triple parallel array s, containing the first, second, respectively third member of each element triple of this parallel array .
[use case]
the position of the replacement
the replacing element
a new parallel array
which is a copy of this parallel array
with the element at position index replaced by elem.
[use case]
the type of the second half of the returned pairs
The iterable providing the second half of each result pair
a new collection of type That containing pairs consisting of
corresponding elements of this parallel array
and that. The length
of the returned collection is the minimum of the lengths of this parallel array
and that.
[use case]
the iterable providing the second half of each result pair
the element to be used to fill up the result if this parallel array
is shorter than that.
the element to be used to fill up the result if that is shorter than this parallel array
.
a new collection of type That containing pairs consisting of
corresponding elements of this parallel array
and that. The length
of the returned collection is the maximum of the lengths of this parallel array
and that.
If this parallel array
is shorter than that, thisElem values are used to pad the result.
If that is shorter than this parallel array
, thatElem values are used to pad the result.
[use case]
A new collection of type That containing pairs consisting of all elements of this
parallel array
paired with their index. Indices start at 0.
Parallel sequence holding elements in a linear array.
ParArrayis a parallel sequence with a predefined size. The size of the array cannot be changed after it's been created.ParArrayinternally keeps an array containing the elements. This means that bulk operations based on traversal ensure fast access to elements.ParArrayuses lazy builders that create the internal data array only after the size of the array is known. In the meantime, they keep the result set fragmented. The fragments are copied into the resulting data array in parallel using fast array copy operations once all the combiners are populated in parallel.type of the elements in the array