scala.collection.parallel.ParSeqViewLike
A fall back which forces everything into a vector and then applies an operation on it. Used for those operations which do not naturally lend themselves to a view
Standard accessor task that iterates over the elements of the collection.
Used to iterate elements using indices
A fall back which forces everything into a vector and then applies an operation on it.
Performs two tasks in parallel, and waits for both to finish.
An iterator that can be split into arbitrary subsets of iterators.
The type implementing this traversable
Sequentially performs one task after another.
A stackable modification that ensures signal contexts get passed along the iterators.
The implementation base trait of this view.
A class supporting filtered operations.
o != arg0
is the same as !(o == (arg0))
.
o != arg0
is the same as !(o == (arg0))
.
the object to compare against this object for dis-equality.
false
if the receiver object is equivalent to the argument; true
otherwise.
[use case] Concatenates this parallel iterable with the elements of a traversable collection.
Concatenates this parallel iterable with the elements of a traversable collection.
the element type of the returned collection.
the traversable to append.
a new parallel iterable which contains all elements of this parallel iterable
followed by all elements of that
.
Concatenates this parallel iterable with the elements of a traversable collection.
Concatenates this parallel iterable with the elements of a traversable collection.
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.
an implicit value of class CanBuildFrom
which determines the
result class That
from the current representation type Repr
and the new element type B
.
a new collection of type That
which contains all elements
of this parallel iterable followed by all elements of that
.
This overload exists because: for the implementation of ++: we should reuse that of ++ because many collections override it with more efficient versions.
This overload exists because: for the implementation of ++: we should reuse that of ++ because many collections override it with more efficient versions. Since TraversableOnce has no '++' method, we have to implement that directly, but Traversable and down can use the overload.
[use case] Concatenates this parallel iterable with the elements of a traversable collection.
Concatenates this parallel iterable with the elements of a traversable collection. It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one.
the element type of the returned collection.
the traversable to append.
a new parallel iterable which contains all elements of this parallel iterable
followed by all elements of that
.
Concatenates this parallel iterable with the elements of a traversable collection.
Concatenates this parallel iterable with the elements of a traversable collection. It differs from ++ in that the right operand determines the type of the resulting collection rather than the left one.
the element type of the returned collection.
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.
the traversable to append.
an implicit value of class CanBuildFrom
which determines the
result class That
from the current representation type Repr
and the new element type B
.
a new collection of type That
which contains all elements
of this parallel iterable followed by all elements of that
.
[use case] Prepends an element to this parallel iterable
Prepends an element to this parallel iterable
the prepended element
a new parallel iterable consisting of elem
followed
by all elements of this parallel iterable.
Prepends an element to this parallel iterable
Prepends an element to this parallel iterable
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.
the prepended element
an implicit value of class CanBuildFrom
which determines the
result class That
from the current representation type Repr
and the new element type B
.
a new collection of type That
consisting of elem
followed
by all elements of this parallel iterable.
Applies a binary operator to a start value and all elements of this parallel iterable, going left to right.
Applies a binary operator to a start value and all elements of this parallel iterable, going left to right.
Note: /:
is alternate syntax for foldLeft
; z /: xs
is the same as
xs foldLeft z
.
Note: will not terminate for infinite-sized collections.
the result type of the binary operator.
the start value.
the binary operator.
the result of inserting op
between consecutive elements of this parallel iterable,
going left to right with the start value z
on the left:
op(...op(op(z, x,,1,,), x,,2,,), ..., x,,n,,)
where x,,1,,, ..., x,,n,,
are the elements of this parallel iterable.
[use case] Appends an element to this parallel iterable
Appends an element to this parallel iterable
Note: will not terminate for infinite-sized collections.
the appended element
a new parallel iterable consisting of
all elements of this parallel iterable followed by elem
.
Appends an element to this parallel iterable
Appends an element to this parallel iterable
Note: will not terminate for infinite-sized collections.
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.
the appended element
an implicit value of class CanBuildFrom
which determines the
result class That
from the current representation type Repr
and the new element type B
.
a new collection of type That
consisting of
all elements of this parallel iterable followed by elem
.
Applies a binary operator to all elements of this parallel iterable and a start value, going right to left.
Applies a binary operator to all elements of this parallel iterable 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.
the result type of the binary operator.
the start value
the binary operator
the result of inserting op
between consecutive elements of this parallel iterable,
going right to left with the start value z
on the right:
op(x,,1,,, op(x,,2,,, ... op(x,,n,,, z)...))
where x,,1,,, ..., x,,n,,
are the elements of this parallel iterable.
o == arg0
is the same as if (o eq null) arg0 eq null else o.equals(arg0)
.
o == arg0
is the same as if (o eq null) arg0 eq null else o.equals(arg0)
.
the object to compare against this object for equality.
true
if the receiver object is equivalent to the argument; false
otherwise.
o == arg0
is the same as o.equals(arg0)
.
o == arg0
is the same as o.equals(arg0)
.
the object to compare against this object for equality.
true
if the receiver object is equivalent to the argument; false
otherwise.
Appends all elements of this parallel iterable to a string builder.
Appends all elements of this parallel iterable to a string builder.
The written text consists of the string representations (w.r.t. the method
toString
) of all elements of this parallel iterable without any separator string.
the string builder to which elements are appended.
the string builder b
to which elements were appended.
Appends all elements of this parallel iterable to a string builder using a separator string.
Appends all elements of this parallel iterable to a string builder using a separator
string. The written text consists of the string representations (w.r.t.
the method toString
) of all elements of this parallel iterable, separated by the
string sep
.
the string builder to which elements are appended.
the separator string.
the string builder b
to which elements were appended.
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
Composes this partial function with a transformation function that gets applied to results of this partial function.
Composes this partial function with a transformation function that gets applied to results of this partial function.
the result type of the transformation function.
the transformation function
a partial function with the same domain as this partial function, which maps
arguments x
to k(this(x))
.
Selects an element by its index in the parallel iterable.
Selects an element by its index in the parallel iterable.
The index to select.
the element of this parallel iterable at index idx
, where 0
indicates the first element.
This method is used to cast the receiver object to be of type T0
.
This method is used to 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 typed.
the receiver object.
Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.
Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.
The object with which this parallel iterable should be compared
true
, if this parallel iterable can possibly equal that
, false
otherwise. The test
takes into consideration only the run-time types of objects but ignores their elements.
This method creates and returns a copy of the receiver object.
[use case] Builds a new collection by applying a partial function to all elements of this parallel iterable on which the function is defined.
Builds a new collection by applying a partial function to all elements of this parallel iterable on which the function is defined.
the element type of the returned collection.
the partial function which filters and maps the parallel iterable.
a new parallel iterable resulting from applying the given partial function
pf
to each element on which it is defined and collecting the results.
The order of the elements is preserved.
Builds a new collection by applying a partial function to all elements of this parallel iterable on which the function is defined.
Builds a new collection by applying a partial function to all elements of this parallel iterable on which the function is defined.
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.
the partial function which filters and maps the parallel iterable.
an implicit value of class CanBuildFrom
which determines the
result class That
from the current representation type Repr
and the new element type B
.
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.
Finds the first element of the parallel iterable for which the given partial function is defined, and applies the partial function to it.
Finds the first element of the parallel iterable for which the given partial function is defined, and applies the partial function to it.
Note: may not terminate for infinite-sized collections.
the partial function
an option value containing pf applied to the first
value for which it is defined, or None
if none exists.
Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)
Iterates over combinations.
Iterates over combinations.
An Iterator which traverses the possible n-element combinations of this parallel iterable.
"abbbc".combinations(2) = Iterator(ab, ac, bb, bc)
The factory companion object that builds instances of class ParIterable.
The factory companion object that builds instances of class ParIterable.
(or its Iterable
superclass where class ParIterable is not a Seq
.)
Composes two instances of Function1 in a new Function1, with this function applied last.
Composes two instances of Function1 in a new Function1, with this function applied last.
the type to which function g
can be applied
a function A => T1
a new function f
such that f(x) == apply(g(x))
Tests whether this parallel iterable contains a given value as an element.
Tests whether this parallel iterable contains a given value as an element.
Note: may not terminate for infinite-sized collections.
the element to test.
true
if this parallel iterable has an element that is
is equal (wrt ==
) to elem
, false
otherwise.
Tests whether this parallel iterable contains a given sequence as a slice.
Tests whether this parallel iterable contains a given sequence as a slice.
Note: may not terminate for infinite-sized collections.
the sequence to test
true
if this parallel iterable contains a slice with the same elements
as that
, otherwise false
.
[use case] Copies elements of this parallel iterable to an array.
Copies elements of this parallel iterable to an array.
Fills the given array xs
with at most len
elements of
this parallel iterable, starting at position start
.
Copying will stop once either the end of the current parallel iterable is reached,
or the end of the array is reached, or len
elements have been copied.
the array to fill.
the starting index.
the maximal number of elements to copy.
Copies elements of this parallel iterable to an array.
Copies elements of this parallel iterable to an array.
Fills the given array xs
with at most len
elements of
this parallel iterable, starting at position start
.
Copying will stop once either the end of the current parallel iterable is reached,
or the end of the array is reached, or len
elements have been copied.
Note: will not terminate for infinite-sized collections.
the array to fill.
the starting index.
the maximal number of elements to copy.
[use case] Copies values of this parallel iterable to an array.
Copies values of this parallel iterable to an array.
Fills the given array xs
with values of this parallel iterable.
Copying will stop once either the end of the current parallel iterable is reached,
or the end of the array is reached.
the array to fill.
Copies values of this parallel iterable to an array.
Copies values of this parallel iterable to an array.
Fills the given array xs
with values of this parallel iterable.
Copying will stop once either the end of the current parallel iterable is reached,
or the end of the array is reached.
Note: will not terminate for infinite-sized collections.
the type of the elements of the array.
the array to fill.
[use case] Copies values of this parallel iterable to an array.
Copies values of this parallel iterable to an array.
Fills the given array xs
with values of this parallel iterable, after skipping start
values.
Copying will stop once either the end of the current parallel iterable is reached,
or the end of the array is reached.
the array to fill.
the starting index.
Copies values of this parallel iterable to an array.
Copies values of this parallel iterable to an array.
Fills the given array xs
with values of this parallel iterable, after skipping start
values.
Copying will stop once either the end of the current parallel iterable is reached,
or the end of the array is reached.
Note: will not terminate for infinite-sized collections.
the type of the elements of the array.
the array to fill.
the starting index.
Copies all elements of this parallel iterable to a buffer.
Copies all elements of this parallel iterable to a buffer.
Note: will not terminate for infinite-sized collections.
The buffer to which elements are copied.
Tests whether every element of this parallel iterable relates to the corresponding element of another parallel sequence by satisfying a test predicate.
Tests whether every element of this parallel iterable 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 iterable
and y
of that
, otherwise false
Counts the number of elements in the parallel iterable which satisfy a predicate.
Counts the number of elements in the parallel iterable which satisfy a predicate.
the predicate used to test elements.
the number of elements satisfying the predicate p
.
[use case] Computes the multiset difference between this parallel iterable and another sequence.
Computes the multiset difference between this parallel iterable and another sequence.
Note: will not terminate for infinite-sized collections.
the sequence of elements to remove
a new parallel iterable which contains all elements of this parallel iterable
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.
Computes the multiset difference between this parallel iterable and another sequence.
Computes the multiset difference between this parallel iterable and another sequence.
Note: will not terminate for infinite-sized collections.
the sequence of elements to remove
a new collection of type That
which contains all elements of this parallel iterable
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 iterable from this parallel iterable without any duplicate elements.
Builds a new parallel iterable from this parallel iterable without any duplicate elements.
Note: will not terminate for infinite-sized collections.
A new parallel iterable which contains the first occurrence of every element of this parallel iterable.
Selects all elements except first n ones.
Selects all elements except first n ones.
the number of elements to drop from this parallel iterable.
a parallel iterable consisting of all elements of this parallel iterable except the first n
ones, or else the
empty parallel iterable, if this parallel iterable has less than n
elements.
Selects all elements except last n ones.
Selects all elements except last n ones.
The number of elements to take
a parallel iterable consisting of all elements of this parallel iterable except the last n
ones, or else the
empty parallel iterable, if this parallel iterable 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.
a collection composed of all the elements after the longest prefix of elements
in this parallel iterable that satisfy the predicate pred
use iterator' instead
Tests whether this parallel iterable ends with the given parallel sequence
Tests whether this parallel iterable 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 iterable has that
as a suffix, false
otherwise
This method is used to test whether the argument (arg0
) is a reference to the
receiver object (this
).
This method is used to test whether the argument (arg0
) is a reference to the
receiver object (this
).
The eq
method implements an [http://en.wikipedia.org/wiki/Equivalence_relation equivalence relation] on
non-null instances of AnyRef
:
* It is reflexive: for any non-null instance x
of type AnyRef
, x.eq(x)
returns true
.
* It is symmetric: for any non-null instances x
and y
of type AnyRef
, x.eq(y)
returns true
if and
only if y.eq(x)
returns true
.
* It is transitive: for any non-null instances x
, y
, and z
of type AnyRef
if x.eq(y)
returns true
and y.eq(z)
returns true
, then x.eq(z)
returns true
.
Additionally, the eq
method has three other 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
).
the object to compare against this object for reference equality.
true
if the argument is a reference to the receiver object; false
otherwise.
The equals method for arbitrary sequences.
Tests whether every element of this parallel iterable relates to the corresponding element of another sequence by satisfying a test predicate.
Tests whether every element of this parallel iterable relates to the corresponding element of another sequence by satisfying a test predicate.
the type of the elements of that
the other sequence
true
if both sequences have the same length and
p(x, y)
is true
for all corresponding elements x
of this parallel iterable
and y
of that
, otherwise false
.
use corresponds
instead
Tests whether a predicate holds for some element of this parallel iterable.
Tests whether a predicate holds for some element of this parallel iterable.
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 iterable which satisfy a predicate.
Selects all elements of this parallel iterable which satisfy a predicate.
the predicate used to test elements.
a new parallel iterable consisting of all elements of this parallel iterable that satisfy the given
predicate p
. The order of the elements is preserved.
Selects all elements of this parallel iterable which do not satisfy a predicate.
Selects all elements of this parallel iterable which do not satisfy a predicate.
the predicate used to test elements.
a new parallel iterable consisting of all elements of this parallel iterable that do not satisfy the given
predicate p
. The order of the elements is preserved.
This method is called by the garbage collector on the receiver object when garbage collection determines that there are no more references to the object.
This method is called by the garbage collector on the receiver object when garbage collection determines that there are no more references to the object.
The details of when and if the finalize
method are 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
Returns index of the first element satisfying a predicate, or -1
.
Returns index of the first element satisfying a predicate, or -1
.
Returns index of the last element satisfying a predicate, or -1.
Returns index of the last element satisfying a predicate, or -1.
use lastIndexWhere
instead
use head' instead
None
if iterable is empty.
None
if iterable is empty.
use headOption' instead
[use case] Builds a new collection by applying a function to all elements of this parallel iterable and concatenating the results.
Builds a new collection by applying a function to all elements of this parallel iterable and concatenating the results.
the element type of the returned collection.
the function to apply to each element.
a new parallel iterable resulting from applying the given collection-valued function
f
to each element of this parallel iterable and concatenating the results.
Builds a new collection by applying a function to all elements of this parallel iterable and concatenating the results.
Builds a new collection by applying a function to all elements of this parallel iterable and concatenating the results.
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.
the function to apply to each element.
an implicit value of class CanBuildFrom
which determines the
result class That
from the current representation type Repr
and the new element type B
.
a new collection of type That
resulting from applying the given collection-valued function
f
to each element of this parallel iterable and concatenating the results.
[use case] Converts this parallel iterable of traversable collections into a parallel iterable in which all element collections are concatenated.
Converts this parallel iterable of traversable collections into a parallel iterable in which all element collections are concatenated.
the type of the elements of each traversable collection.
a new parallel iterable resulting from concatenating all element parallel iterables.
Converts this parallel iterable of traversable collections into a parallel iterable in which all element collections are concatenated.
Converts this parallel iterable of traversable collections into a parallel iterable in which all element collections are concatenated.
the type of the elements of each traversable collection.
an implicit conversion which asserts that the element
type of this parallel iterable is a Traversable
.
a new parallel iterable resulting from concatenating all element parallel iterables.
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 iterable, going left to right.
Applies a binary operator to a start value and all elements of this parallel iterable, going left to right.
Note: will not terminate for infinite-sized collections.
the start value.
the binary operator.
the result of inserting op
between consecutive elements of this parallel iterable,
going left to right with the start value z
on the left:
op(...op(z, x,,1,,), x,,2,,, ..., x,,n,,)
where x,,1,,, ..., x,,n,,
are the elements of this parallel iterable.
Applies a binary operator to all elements of this parallel iterable and a start value, going right to left.
Applies a binary operator to all elements of this parallel iterable and a start value, going right to left.
Note: will not terminate for infinite-sized collections.
the start value.
the binary operator.
the result of inserting op
between consecutive elements of this parallel iterable,
going right to left with the start value z
on the right:
op(x,,1,,, op(x,,2,,, ... op(x,,n,,, z)...))
where x,,1,,, ..., x,,n,,
are the elements of this parallel iterable.
Tests whether a predicate holds for all elements of this parallel iterable.
Tests whether a predicate holds for all elements of this parallel iterable.
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 iterable in a sequential order.
Applies a function f
to all the elements of parallel iterable 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 ParIterable at arbitrary element types.
The generic builder that builds instances of ParIterable at arbitrary element types.
Returns a representation that corresponds to the dynamic class of the receiver object.
Returns 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.
Partitions this parallel iterable into a map of parallel iterables according to some discriminator function.
Partitions this parallel iterable into a map of parallel iterables 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 iterable.
the type of keys returned by the discriminator function.
the discriminator function.
A map from keys to parallel iterables 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 iterable of those elements x
for which f(x)
equals k
.
Partitions elements in fixed size parallel iterables.
Partitions elements in fixed size parallel iterables.
the number of elements per group
An iterator producing parallel iterables of size size
, except the
last will be truncated if the elements don't divide evenly.
Iterator#grouped
Tests whether this parallel iterable is known to have a finite size.
Tests whether this parallel iterable is known to have a finite size.
All strict collections are known to have finite size. For a non-strict collection
such as Stream
, the predicate returns true
if all elements have been computed.
It returns false
if the stream is not yet evaluated to the end.
Note: many collection methods will not work on collections of infinite sizes.
true
if this collection is known to have finite size, false
otherwise.
Hashcodes for ParIterable produce a value from the hashcodes of all the elements of the parallel iterable.
Hashcodes for ParIterable produce a value from the hashcodes of all the elements of the parallel iterable.@return the hash code value for the object. */
Selects the first element of this parallel iterable.
Selects the first element of this parallel iterable.
the first element of this parallel iterable.
Optionally selects the first element.
Optionally selects the first element.
the first element of this parallel iterable if it is nonempty, None
if it is empty.
[use case] Finds index of first occurrence of some value in this parallel iterable after or at some start index.
Finds index of first occurrence of some value in this parallel iterable after or at some start index.
the element value to search for.
the start index
the index >= from
of the first element of this parallel iterable that is equal (wrt ==
)
to elem
, or -1
, if none exists.
Finds index of first occurrence of some value in this parallel iterable after or at some start index.
Finds index of first occurrence of some value in this parallel iterable after or at some start index.
Note: may not terminate for infinite-sized collections.
the element value to search for.
the start index
the index >= from
of the first element of this parallel iterable that is equal (wrt ==
)
to elem
, or -1
, if none exists.
[use case] Finds index of first occurrence of some value in this parallel iterable.
Finds index of first occurrence of some value in this parallel iterable.
the element value to search for.
the index of the first element of this parallel iterable that is equal (wrt ==
)
to elem
, or -1
, if none exists.
Finds index of first occurrence of some value in this parallel iterable.
Finds index of first occurrence of some value in this parallel iterable.
Note: may not terminate for infinite-sized collections.
the element value to search for.
the index of the first element of this parallel iterable that is equal (wrt ==
)
to elem
, or -1
, if none exists.
Finds first index after or at a start index where this parallel iterable contains a given sequence as a slice.
Finds first index after or at a start index where this parallel iterable contains a given sequence as a slice.
Note: may not terminate for infinite-sized collections.
the sequence to test
the start index
the first index >= from
such that the elements of this parallel iterable starting at this index
match the elements of sequence that
, or -1
of no such subsequence exists.
Finds first index where this parallel iterable contains a given sequence as a slice.
Finds first index where this parallel iterable contains a given sequence as a slice.
Note: may not terminate for infinite-sized collections.
the sequence to test
the first index such that the elements of this parallel iterable starting at this index
match the elements of sequence that
, or -1
of no such subsequence 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 iterable that satisfies the predicate p
,
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 iterable that satisfies the predicate p
,
or -1
, if none exists
Produces the range of all indices of this sequence.
Produces the range of all indices of this sequence.
a Range
value from 0
to one less than the length of this parallel iterable.
Selects all elements except the last.
Selects all elements except the last.
a parallel iterable consisting of all elements of this parallel iterable except the last one.
Iterates over the inits of this parallel iterable.
Iterates over the inits of this parallel iterable. The first value will be this
parallel iterable and the final one will be an empty parallel iterable, with the intervening
values the results of successive applications of init
.
an iterator over all the inits of this parallel iterable
List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)
[use case] Computes the multiset intersection between this parallel iterable and another sequence.
Computes the multiset intersection between this parallel iterable and another sequence.
Note: may not terminate for infinite-sized collections.
the sequence of elements to intersect with.
a new parallel iterable which contains all elements of this parallel iterable
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.
Computes the multiset intersection between this parallel iterable and another sequence.
Computes the multiset intersection between this parallel iterable and another sequence.
Note: may not terminate for infinite-sized collections.
the sequence of elements to intersect with.
a new collection of type That
which contains all elements of this parallel iterable
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 iterable contains given index.
Tests whether this parallel iterable 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 iterable contains an element at position idx
, false
otherwise.
Tests whether this parallel iterable is empty.
Tests whether this parallel iterable is empty.
true
if the parallel iterable contain no elements, false
otherwise.
This method is used to test whether the dynamic type of the receiver object is T0
.
This method is used to test whether the dynamic type of the receiver object is T0
.
Note that the test 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 requested typed.
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 iterable can be repeatedly traversed.
Tests whether this parallel iterable can be repeatedly traversed.
true
Creates a new iterator over all elements contained in this iterable object.
Creates a new iterator over all elements contained in this iterable object.
the new iterator
Selects the last element.
Selects the last element.
The last element of this parallel iterable.
[use case] Finds index of last occurrence of some value in this parallel iterable before or at a given end index.
Finds index of last occurrence of some value in this parallel iterable before or at a given end index.
the element value to search for.
the end index.
the index <= end
of the last element of this parallel iterable that is equal (wrt ==
)
to elem
, or -1
, if none exists.
Finds index of last occurrence of some value in this parallel iterable before or at a given end index.
Finds index of last occurrence of some value in this parallel iterable before or at a given end index.
the type of the element elem
.
the element value to search for.
the end index.
the index <= end
of the last element of this parallel iterable that is equal (wrt ==
)
to elem
, or -1
, if none exists.
[use case] Finds index of last occurrence of some value in this parallel iterable.
Finds index of last occurrence of some value in this parallel iterable.
the element value to search for.
the index of the last element of this parallel iterable that is equal (wrt ==
)
to elem
, or -1
, if none exists.
Finds index of last occurrence of some value in this parallel iterable.
Finds index of last occurrence of some value in this parallel iterable.
Note: will not terminate for infinite-sized collections.
the type of the element elem
.
the element value to search for.
the index of the last element of this parallel iterable that is equal (wrt ==
)
to elem
, or -1
, if none exists.
Finds last index before or at a given end index where this parallel iterable contains a given sequence as a slice.
Finds last index before or at a given end index where this parallel iterable contains a given sequence as a slice.
the sequence to test
the end index
the last index <= end
such that the elements of this parallel iterable starting at this index
match the elements of sequence that
, or -1
of no such subsequence exists.
Finds last index where this parallel iterable contains a given sequence as a slice.
Finds last index where this parallel iterable contains a given sequence as a slice.
Note: will not terminate for infinite-sized collections.
the sequence to test
the last index such that the elements of this parallel iterable starting a this index
match the elements of sequence that
, or -1
of no such subsequence 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 iterable 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 iterable that satisfies the predicate p
,
or -1
, if none exists.
Optionally selects the last element.
Optionally selects the last element.
the last element of this parallel iterable$ if it is nonempty, None
if it is empty.
The length of the parallel iterable.
The length of the parallel iterable.
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 iterable.
Compares the length of this parallel iterable to a test value.
Compares the length of this parallel iterable to a test value.
the test value that gets compared with the length.
A value x
where
x < 0 if this.length < len x == 0 if this.length == len x > 0 if this.length > len
The method as implemented here does not call length
directly; its running time
is O(length min len)
instead of O(length)
. The method should be overwritten
if computing length
is cheap.
Turns this partial function into an plain function returning an Option
result.
Turns this partial function into an plain function returning an Option
result.
a function that takes an argument x
to Some(this(x))
if this
is defined for x
, and to None
otherwise.
Function.unlift
[use case] Builds a new collection by applying a function to all elements of this parallel iterable.
Builds a new collection by applying a function to all elements of this parallel iterable.
the element type of the returned collection.
the function to apply to each element.
a new parallel iterable resulting from applying the given function
f
to each element of this parallel iterable and collecting the results.
Builds a new collection by applying a function to all elements of this parallel iterable.
Builds a new collection by applying a function to all elements of this parallel iterable.
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.
the function to apply to each element.
an implicit value of class CanBuildFrom
which determines the
result class That
from the current representation type Repr
and the new element type B
.
a new collection of type That
resulting from applying the given function
f
to each element of this parallel iterable and collecting the results.
[use case] Finds the largest element.
Finds the largest element.
the largest element of this parallel iterable.
Finds the largest element.
Finds the largest element.
the largest element of this parallel iterable with respect to the ordering cmp
.
[use case] Finds the smallest element.
Finds the smallest element.
the smallest element of this parallel iterable
Finds the smallest element.
Finds the smallest element.
the smallest element of this parallel iterable with respect to the ordering cmp
.
Displays all elements of this parallel iterable in a string.
Displays all elements of this parallel iterable in a string.
a string representation of this parallel iterable. In the resulting string
the string representations (w.r.t. the method toString
)
of all elements of this parallel iterable follow each other without any
separator string.
Displays all elements of this parallel iterable in a string using a separator string.
Displays all elements of this parallel iterable in a string using a separator string.
the separator string.
a string representation of this parallel iterable. In the resulting string
the string representations (w.r.t. the method toString
)
of all elements of this parallel iterable are separated by the string sep
.
List(1, 2, 3).mkString("|") = "1|2|3"
Displays all elements of this parallel iterable in a string using start, end, and separator strings.
Displays all elements of this parallel iterable in a string using start, end, and separator strings.
the starting string.
the separator string.
the ending string.
a string representation of this parallel iterable. 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 iterable are separated by
the string sep
.
List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"
o.ne(arg0)
is the same as !(o.eq(arg0))
.
o.ne(arg0)
is the same as !(o.eq(arg0))
.
the object to compare against this object for reference dis-equality.
false
if the argument is not a reference to the receiver object; true
otherwise.
The newBuilder
operation returns a parallel builder assigned to this collection's fork/join pool.
The newBuilder
operation returns a parallel builder assigned to this collection's fork/join pool.
This method forwards the call to newCombiner
.
Boilerplate method, to override in each subclass This method could be eliminated if Scala had virtual classes
Boilerplate method, to override in each subclass This method could be eliminated if Scala had virtual classes
Boilerplate method, to override in each subclass This method could be eliminated if Scala had virtual classes
Boilerplate method, to override in each subclass This method could be eliminated if Scala had virtual classes
Tests whether the parallel iterable is not empty.
Tests whether the parallel iterable is not empty.
true
if the parallel iterable 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.
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.
Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.
Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.
the argument type of the fallback function
the result type of the fallback function
the fallback function
a partial function which has as domain the union of the domains
of this partial function and that
. The resulting partial function
takes x
to this(x)
where this
is defined, and to that(x)
where it is not.
[use case] Appends an element value to this parallel iterable until a given target length is reached.
Appends an element value to this parallel iterable until a given target length is reached.
the target length
the padding value
a new parallel iterable consisting of
all elements of this parallel iterable followed by the minimal number of occurrences of elem
so
that the resulting parallel iterable has a length of at least len
.
Appends an element value to this parallel iterable until a given target length is reached.
Appends an element value to this parallel iterable until a given target length is reached.
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.
the target length
the padding value
an implicit value of class CanBuildFrom
which determines the
result class That
from the current representation type Repr
and the new element type B
.
a new collection of type That
consisting of
all elements of this parallel iterable 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
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.
a parallel iterator
Partitions this parallel iterable in two parallel iterables according to a predicate.
Partitions this parallel iterable in two parallel iterables according to a predicate.
the predicate on which to partition.
a pair of parallel iterables: the first parallel iterable consists of all elements that
satisfy the predicate p
and the second parallel iterable consists of all elements
that don't. The relative order of the elements in the resulting parallel iterables
is the same as in the original parallel iterable.
[use case] Produces a new parallel iterable where a slice of elements in this parallel iterable is replaced by another sequence.
Produces a new parallel iterable where a slice of elements in this parallel iterable is replaced by another sequence.
the index of the first replaced element
the number of elements to drop in the original parallel iterable
a new parallel iterable consisting of all elements of this parallel iterable
except that replaced
elements starting from from
are replaced
by patch
.
Produces a new parallel iterable where a slice of elements in this parallel iterable is replaced by another sequence.
Produces a new parallel iterable where a slice of elements in this parallel iterable is replaced by another sequence.
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.
the index of the first replaced element
the replacement sequence
an implicit value of class CanBuildFrom
which determines the
result class That
from the current representation type Repr
and the new element type B
.
a new parallel iterable consisting of all elements of this parallel iterable
except that replaced
elements starting from from
are replaced
by patch
.
Iterates over distinct permutations.
Iterates over distinct permutations.
An Iterator which traverses the distinct permutations of this parallel iterable.
"abb".permutations = Iterator(abb, bab, bba)
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 iterable
such that every element of the segment satisfies the predicate p
.
[use case] Multiplies up the elements of this collection.
Multiplies up the elements of this collection.
the product of all elements in this parallel iterable of numbers of type Int
.
Instead of Int
, any other type T
with an implicit Numeric[T]
implementation
can be used as element type of the parallel iterable and as result type of product
.
Examples of such types are: Long
, Float
, Double
, BigInt
.
Multiplies up the elements of this collection.
Multiplies up the elements of this collection.
an implicit parameter defining a set of numeric operations
which includes the *
operator to be used in forming the product.
the product of all elements of this parallel iterable with respect to the *
operator in num
.
returns a projection that can be used to call non-strict filter
,
map
, and flatMap
methods that build projections
of the collection.
returns a projection that can be used to call non-strict filter
,
map
, and flatMap
methods that build projections
of the collection.
use view' instead
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 the operations on elements are performed 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.
Applies a binary operator to all elements of this parallel iterable, going left to right.
Applies a binary operator to all elements of this parallel iterable, going left to right.
Note: will not terminate for infinite-sized collections.
the binary operator.
the result of inserting op
between consecutive elements of this parallel iterable,
going left to right:
op(...(op(x,,1,,, x,,2,,), ... ) , x,,n,,)
where x,,1,,, ..., x,,n,,
are the elements of this parallel iterable.
Optionally applies a binary operator to all elements of this parallel iterable, going left to right.
Optionally applies a binary operator to all elements of this parallel iterable, going left to right.
Note: will not terminate for infinite-sized collections.
the result type of the binary operator.
the binary operator.
an option value containing the result of reduceLeft(op)
is this parallel iterable 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 the operations on elements are performed 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 iterable, going right to left.
Applies a binary operator to all elements of this parallel iterable, going right to left.
Note: will not terminate for infinite-sized collections.
the binary operator.
the result of inserting op
between consecutive elements of this parallel iterable,
going right to left:
op(x,,1,,, op(x,,2,,, ..., op(x,,n-1,,, x,,n,,)...))
where x,,1,,, ..., x,,n,,
are the elements of this parallel iterable.
Optionally applies a binary operator to all elements of this parallel iterable, going right to left.
Optionally applies a binary operator to all elements of this parallel iterable, going right to left.
Note: will not terminate for infinite-sized collections.
the result type of the binary operator.
the binary operator.
an option value containing the result of reduceRight(op)
is this parallel iterable is nonempty,
None
otherwise.
The collection of type parallel iterable underlying this TraversableLike
object.
The collection of type parallel iterable underlying this TraversableLike
object.
By default this is implemented as the TraversableLike
object itself,
but this can be overridden.
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 iterable wih elements in reversed order.
Returns new parallel iterable wih elements in reversed order.
Note: will not terminate for infinite-sized collections.
A new parallel iterable with all elements of this parallel iterable in reversed order.
An iterator yielding elements in reversed order.
An iterator yielding elements in reversed order.
Note: will not terminate for infinite-sized collections.
Note: xs.reverseIterator
is the same as xs.reverse.iterator
but might be more efficient.
an iterator yielding the elements of this parallel iterable in reversed order
[use case] Builds a new collection by applying a function to all elements of this parallel iterable and collecting the results in reversed order.
Builds a new collection by applying a function to all elements of this parallel iterable and collecting the results in reversed order.
the element type of the returned collection.
Note: xs.reverseMap(f)
is the same as xs.reverse.map(f)
but might be more efficient.
the function to apply to each element.
a new parallel iterable resulting from applying the given function
f
to each element of this parallel iterable and collecting the results in reversed order.
Builds a new collection by applying a function to all elements of this parallel iterable and collecting the results in reversed order.
Builds a new collection by applying a function to all elements of this parallel iterable and collecting the results in reversed order.
Note: will not terminate for infinite-sized collections.
Note: xs.reverseMap(f)
is the same as xs.reverse.map(f)
but might be more efficient.
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.
the function to apply to each element.
an implicit value of class CanBuildFrom
which determines the
result class That
from the current representation type Repr
and the new element type B
.
a new collection of type That
resulting from applying the given function
f
to each element of this parallel iterable and collecting the results in reversed order.
use reverseIterator' instead
[use case] Checks if the other iterable collection contains the same elements in the same order as this parallel iterable.
Checks if the other iterable collection contains the same elements in the same order as this parallel iterable.
the collection to compare with.
true
, if both collections contain the same elements in the same order, false
otherwise.
Checks if the other iterable collection contains the same elements in the same order as this parallel iterable.
Checks if the other iterable collection contains the same elements in the same order as this parallel iterable.
Note: will not terminate for infinite-sized collections.
the collection to compare with.
true
, if both collections contain the same elements in the same order, false
otherwise.
[use case] Computes a prefix scan of the elements of the collection.
Computes a prefix scan of the elements of the collection.
neutral element for the operator op
the associative operator for the scan
a new parallel iterable containing the prefix scan of the elements in this parallel iterable
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.
element type of the resulting collection
type of the resulting collection
neutral element for the operator op
the associative operator for the scan
combiner factory which provides a combiner
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.
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 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.
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 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
A version of this collection with all of the operations implemented sequentially (i.
A version of this collection with all of the operations implemented sequentially (i.e. in a single-threaded manner).
This method returns a reference to this collection. In parallel collections, it is redefined to return a sequential implementation of this collection. In both cases, it has O(1) complexity.
a sequential view of the collection.
The size of this parallel iterable, equivalent to length
.
The size of this parallel iterable, equivalent to length
.
Note: will not terminate for infinite-sized collections.@return the number of elements in this parallel iterable.
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
the lowest index to include from this parallel iterable.
the highest index to EXCLUDE from this parallel iterable.
a parallel iterable containing the elements greater than or equal to
index from
extending up to (but not including) index until
of this parallel iterable.
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.
Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)
the number of elements per group
An iterator producing parallel iterables of size size
, except the
last and the only element will be truncated if there are
fewer elements than size.
Iterator#sliding
Sorts this ParIterable according to the Ordering which results from transforming an implicitly given Ordering with a transformation function.
Sorts this ParIterable according to the Ordering which results from transforming an implicitly given Ordering with a transformation function.
the target type of the transformation f
, and the type where
the ordering ord
is defined.
the transformation function mapping elements
to some other domain B
.
the ordering assumed on domain B
.
a parallel iterable consisting of the elements of this parallel iterable
sorted according to the ordering where x < y
if
ord.lt(f(x), f(y))
.
val words = "The quick brown fox jumped over the lazy dog".split(' ') // this works because scala.Ordering will implicitly provide an Ordering[Tuple2[Int, Char]] words.sortBy(x => (x.length, x.head)) res0: Array[String] = Array(The, dog, fox, the, lazy, over, brown, quick, jumped)
scala.math.Ordering
Note: will not terminate for infinite-sized collections.
Sorts this parallel iterable according to a comparison function.
Sorts this parallel iterable according to a comparison function.
Note: will not terminate for infinite-sized collections.
The sort is stable. That is, elements that are equal wrt lt
appear in the
same order in the sorted sequence as in the original.
the comparison function which tests whether its first argument precedes its second argument in the desired ordering.
a parallel iterable consisting of the elements of this parallel iterable
sorted according to the comparison function lt
.
List("Steve", "Tom", "John", "Bob").sortWith(_.compareTo(_) < 0) = List("Bob", "John", "Steve", "Tom")
Sorts this parallel iterable according to an Ordering.
Sorts this parallel iterable according to an Ordering.
The sort is stable. That is, elements that are equal wrt lt
appear in the
same order in the sorted sequence as in the original.
the ordering to be used to compare elements.
a parallel iterable consisting of the elements of this parallel iterable
sorted according to the ordering ord
.
scala.math.Ordering
Splits this parallel iterable into a prefix/suffix pair according to a predicate.
Splits this parallel iterable 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.
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 iterable into two at a given position.
Splits this parallel iterable into two at a given position.
Note: c splitAt n
is equivalent to (but possibly more efficient than)
(c take n, c drop n)
.
the position at which to split.
a pair of parallel iterables consisting of the first n
elements of this parallel iterable, and the other elements.
Tests whether this parallel iterable contains the given sequence at a given index.
Tests whether this parallel iterable 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 iterable starts with the given sequence.
Tests whether this parallel iterable 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 iterable. By default the string prefix is the
simple name of the collection class parallel iterable.
[use case] Sums up the elements of this collection.
Sums up the elements of this collection.
the sum of all elements in this parallel iterable of numbers of type Int
.
Instead of Int
, any other type T
with an implicit Numeric[T]
implementation
can be used as element type of the parallel iterable and as result type of sum
.
Examples of such types are: Long
, Float
, Double
, BigInt
.
Sums up the elements of this collection.
Sums up the elements of this collection.
an implicit parameter defining a set of numeric operations
which includes the +
operator to be used in forming the sum.
the sum of all elements of this parallel iterable with respect to the +
operator in num
.
Selects all elements except the first.
Selects all elements except the first.
a parallel iterable consisting of all elements of this parallel iterable except the first one.
Iterates over the tails of this parallel iterable.
Iterates over the tails of this parallel iterable. The first value will be this
parallel iterable and the final one will be an empty parallel iterable, with the intervening
values the results of successive applications of tail
.
an iterator over all the tails of this parallel iterable
List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)
Selects first n elements.
Selects first n elements.
Tt number of elements to take from this parallel iterable.
a parallel iterable consisting only of the first n
elements of this parallel iterable,
or else the whole parallel iterable, if it has less than n
elements.
Selects last n elements.
Selects last n elements.
the number of elements to take
a parallel iterable consisting only of the last n
elements of this parallel iterable, or else the
whole parallel iterable, 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 longest prefix of this parallel iterable of elements that satisy the predicate pred
The underlying collection seen as an instance of ParIterable
.
The underlying collection seen as an instance of ParIterable
.
By default this is implemented as the current collection object itself,
but this can be overridden.
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] Converts this parallel iterable to an array.
Converts this parallel iterable to an array.
Note: will not terminate for infinite-sized collections.
an array containing all elements of this parallel iterable.
A ClassManifest
must be available for the element type of this parallel iterable.
Converts this parallel iterable to an array.
Converts this parallel iterable to an array.
Note: will not terminate for infinite-sized collections.
an array containing all elements of this parallel iterable.
Converts this parallel iterable to a mutable buffer.
Converts this parallel iterable to a mutable buffer.
Note: will not terminate for infinite-sized collections.
a buffer containing all elements of this parallel iterable.
A conversion from collections of type Repr
to ParIterable
objects.
A conversion from collections of type Repr
to ParIterable
objects.
By default this is implemented as just a cast, but this can be overridden.
Converts this parallel iterable to an indexed sequence.
Converts this parallel iterable to an indexed sequence.
Note: will not terminate for infinite-sized collections.
an indexed sequence containing all elements of this parallel iterable.
Converts this parallel iterable to an iterable collection.
Converts this parallel iterable 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 iterable.
Returns an Iterator over the elements in this parallel iterable.
Returns an Iterator over the elements in this parallel iterable. 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 iterable.
Converts this parallel iterable to a list.
Converts this parallel iterable to a list.
Note: will not terminate for infinite-sized collections.
a list containing all elements of this parallel iterable.
[use case] Converts this parallel iterable to a map.
Converts this parallel iterable 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.
a map of type immutable.Map[T, U]
containing all key/value pairs of type (T, U)
of this parallel iterable.
Converts this parallel iterable to a map.
Converts this parallel iterable 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.
a map containing all elements of this parallel iterable.
Converts this parallel iterable to a sequence.
Converts this parallel iterable 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 iterable.
Converts this parallel iterable to a set.
Converts this parallel iterable to a set.
Note: will not terminate for infinite-sized collections.
a set containing all elements of this parallel iterable.
Converts this parallel iterable to a stream.
Converts this parallel iterable to a stream.
Note: will not terminate for infinite-sized collections.
a stream containing all elements of this parallel iterable.
Converts this parallel iterable to a string.
Converts this parallel iterable to a string.
a string representation of this collection. By default this
string consists of the stringPrefix
of this parallel iterable,
followed by all elements separated by commas and enclosed in parentheses.
Converts this parallel iterable to an unspecified Traversable.
Converts this parallel iterable 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 iterable.
Transposes this parallel iterable of traversable collections into a parallel iterable of parallel iterables.
Transposes this parallel iterable of traversable collections into a parallel iterable of parallel iterables.
the type of the elements of each traversable collection.
an implicit conversion which asserts that the
element type of this parallel iterable is a Traversable
.
a two-dimensional parallel iterable of parallel iterables which has as nth row the nth column of this parallel iterable.
[use case] Produces a new sequence which contains all elements of this parallel iterable and also all elements of a given sequence.
Produces a new sequence which contains all elements of this parallel iterable and also all elements of
a given sequence. xs union ys
is equivalent to xs ++ ys
.
Note: will not terminate for infinite-sized collections.
the sequence to add.
a new parallel iterable which contains all elements of this parallel iterable
followed by all elements of that
.
Produces a new sequence which contains all elements of this parallel iterable and also all elements of a given sequence.
Produces a new sequence which contains all elements of this parallel iterable and also all elements of
a given sequence. xs union ys
is equivalent to xs ++ ys
.
Note: will not terminate for infinite-sized collections.
Another way to express this
is that xs union ys
computes the order-presevring multi-set union of xs
and ys
.
union
is hence a counter-part of diff
and intersect
which also work on multi-sets.
Note: will not terminate for infinite-sized collections.
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.
the sequence to add.
an implicit value of class CanBuildFrom
which determines the
result class That
from the current representation type Repr
and the new element type B
.
a new collection of type That
which contains all elements of this parallel iterable
followed by all elements of that
.
Converts this parallel iterable of pairs into two collections of the first and second half of each pair.
Converts this parallel iterable 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 iterable is a pair.
a pair parallel iterables, containing the first, respectively second half of each element pair of this parallel iterable.
Converts this parallel iterable of triples into three collections of the first, second, and third element of each triple.
Converts this parallel iterable of triples into three collections of the first, second, and third element of each triple.
a triple parallel iterables, containing the first, second, respectively third member of each element triple of this parallel iterable.
[use case] A copy of this parallel iterable with one single replaced element.
A copy of this parallel iterable with one single replaced element.
the position of the replacement
the replacing element
a copy of this parallel iterable with the element at position index
replaced by elem
.
A copy of this parallel iterable with one single replaced element.
A copy of this parallel iterable with one single replaced element.
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.
the position of the replacement
the replacing element
an implicit value of class CanBuildFrom
which determines the
result class That
from the current representation type Repr
and the new element type B
.
a new parallel iterable which is a copy of this parallel iterable with the element at position
index replaced by
elem.
Creates a non-strict view of a slice of this parallel iterable.
Creates a non-strict view of a slice of this parallel iterable.
Note: the difference between view
and slice
is that view
produces
a view of the current parallel iterable, whereas slice
produces a new parallel iterable.
Note: view(from, to)
is equivalent to view.slice(from, to)
the index of the first element of the view
the index of the element following the view
a non-strict view of a slice of this parallel iterable, starting at index from
and extending up to (but not including) index until
.
Creates a non-strict view of this parallel iterable.
Creates a non-strict view of this parallel iterable.
a non-strict view of this parallel iterable.
Creates a non-strict filter of this parallel iterable.
Creates a non-strict filter of this parallel iterable.
Note: the difference between c filter p
and c withFilter p
is that
the former creates a new collection, whereas the latter only
restricts the domain of subsequent map
, flatMap
, foreach
,
and withFilter
operations.
the predicate used to test elements.
an object of class WithFilter
, which supports
map
, flatMap
, foreach
, and withFilter
operations.
All these operations apply to those elements of this parallel iterable which
satisfy the predicate p
.
[use case] Returns a parallel iterable formed from this parallel iterable and another iterable collection by combining corresponding elements in pairs.
Returns a parallel iterable formed from this parallel iterable 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.
the type of the second half of the returned pairs
The iterable providing the second half of each result pair
a new parallel iterable containing pairs consisting of
corresponding elements of this parallel iterable and that
. The length
of the returned collection is the minimum of the lengths of this parallel iterable and that
.
Returns a parallel iterable formed from this parallel iterable and another iterable collection by combining corresponding elements in pairs.
Returns a parallel iterable formed from this parallel iterable 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.
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.
The iterable providing the second half of each result pair
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)
.
a new collection of type That
containing pairs consisting of
corresponding elements of this parallel iterable and that
. The length
of the returned collection is the minimum of the lengths of this parallel iterable and that
.
[use case] Returns a parallel iterable formed from this parallel iterable and another iterable collection by combining corresponding elements in pairs.
Returns a parallel iterable formed from this parallel iterable 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.
the type of the second half of the returned pairs
The iterable providing the second half of each result pair
the element to be used to fill up the result if this parallel iterable is shorter than that
.
the element to be used to fill up the result if that
is shorter than this parallel iterable.
a new parallel iterable containing pairs consisting of
corresponding elements of this parallel iterable and that
. The length
of the returned collection is the maximum of the lengths of this parallel iterable and that
.
If this parallel iterable is shorter than that
, thisElem
values are used to pad the result.
If that
is shorter than this parallel iterable, thatElem
values are used to pad the result.
Returns a parallel iterable formed from this parallel iterable and another iterable collection by combining corresponding elements in pairs.
Returns a parallel iterable formed from this parallel iterable 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.
the iterable providing the second half of each result pair
the element to be used to fill up the result if this parallel iterable is shorter than that
.
the element to be used to fill up the result if that
is shorter than this parallel iterable.
a new collection of type That
containing pairs consisting of
corresponding elements of this parallel iterable and that
. The length
of the returned collection is the maximum of the lengths of this parallel iterable and that
.
If this parallel iterable is shorter than that
, thisElem
values are used to pad the result.
If that
is shorter than this parallel iterable, thatElem
values are used to pad the result.
[use case] Zips this parallel iterable with its indices.
Zips this parallel iterable with its indices.
A new parallel iterable containing pairs consisting of all elements of this
parallel iterable paired with their index. Indices start at 0
.
@example
List("a", "b", "c").zipWithIndex = List(("a", 0), ("b", 1), ("c", 2))
Zips this parallel iterable with its indices.
Zips this parallel iterable with its indices.
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.
A new collection of type That
containing pairs consisting of all elements of this
parallel iterable paired with their index. Indices start at 0
.
A fall back which forces everything into a vector and then applies an operation on it. Used for those operations which do not naturally lend themselves to a view