implicit ordering used to compare the elements of type A
.
The type implementing this traversable
The type implementing this traversable
A class supporting filtered operations.
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 ==
Adds all elements provided by a TraversableOnce
object
into the priority queue.
Adds all elements provided by a TraversableOnce
object
into the priority queue.
a traversable object.
a new priority queue containing elements of both xs
and this
.
[use case] Returns a new priority queue containing the elements from the left hand operand followed by the elements from the right hand operand.
Returns a new priority queue containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the priority queue is the most specific superclass encompassing the element types of the two operands.
Example:
scala> val a = LinkedList(1) a: scala.collection.mutable.LinkedList[Int] = LinkedList(1) scala> val b = LinkedList(2) b: scala.collection.mutable.LinkedList[Int] = LinkedList(2) scala> val c = a ++ b c: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2) scala> val d = LinkedList('a') d: scala.collection.mutable.LinkedList[Char] = LinkedList(a) scala> val e = c ++ d e: scala.collection.mutable.LinkedList[AnyVal] = LinkedList(1, 2, a)
the element type of the returned collection.
the traversable to append.
a new priority queue which contains all elements of this priority queue
followed by all elements of that
.
As with ++
, returns a new collection containing the elements from the
left operand followed by the elements from the right operand.
As with ++
, returns a new collection containing the elements from the
left operand followed by the elements from the right operand.
It differs from ++
in that the right operand determines the type of
the resulting collection rather than the left one.
Mnemonic: the COLon is on the side of the new COLlection type.
Example:
scala> val x = List(1) x: List[Int] = List(1) scala> val y = LinkedList(2) y: scala.collection.mutable.LinkedList[Int] = LinkedList(2) scala> val z = x ++: y z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)
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.
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
and the new element type B
.
a new collection of type That
which contains all elements
of this priority queue followed by all elements of that
.
[use case] As with ++
, returns a new collection containing the elements from the left operand followed by the
elements from the right operand.
As with ++
, returns a new collection containing the elements from the left operand followed by the
elements from the right operand.
It differs from ++
in that the right operand determines the type of
the resulting collection rather than the left one.
Mnemonic: the COLon is on the side of the new COLlection type.
Example:
scala> val x = List(1) x: List[Int] = List(1) scala> val y = LinkedList(2) y: scala.collection.mutable.LinkedList[Int] = LinkedList(2) scala> val z = x ++: y z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)
the element type of the returned collection.
the traversable to append.
a new priority queue which contains all elements of this priority queue
followed by all elements of that
.
adds all elements produced by a TraversableOnce to this priority queue.
adds all elements produced by a TraversableOnce to this priority queue.
the TraversableOnce producing the elements to add.
the priority queue itself.
Inserts a single element into the priority queue.
Inserts a single element into the priority queue.
the element to insert.
this priority queue.
adds two or more elements to this priority queue.
adds two or more elements to this priority queue.
the first element to add.
the second element to add.
the remaining elements to add.
the priority queue itself
Applies a binary operator to a start value and all elements of this priority queue, going left to right.
Applies a binary operator to a start value and all elements of this priority queue, 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
the result type of the binary operator.
the start value.
the binary operator.
the result of inserting op
between consecutive elements of this priority queue,
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 priority queue.
Applies a binary operator to all elements of this priority queue and a start value, going right to left.
Applies a binary operator to all elements of this priority queue and a start value, going right to left.
Note: :\
is alternate syntax for foldRight
; xs :\ z
is the same as
xs foldRight 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 = (a :\ 5)(_+_) b: Int = 15 scala> val c = (a :\ 5)((x,y) => x + y) c: Int = 15
the result type of the binary operator.
the start value
the binary operator
the result of inserting op
between consecutive elements of this priority queue,
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 priority queue.
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.
Appends all elements of this priority queue to a string builder.
Appends all elements of this priority queue to a string builder.
The written text consists of the string representations (w.r.t. the method
toString
) of all elements of this priority queue without any separator string.
Example:
scala> val a = LinkedList(1,2,3,4) a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4) scala> val b = new StringBuilder() b: StringBuilder = scala> val h = a.addString(b) b: StringBuilder = 1234
the string builder to which elements are appended.
the string builder b
to which elements were appended.
Appends all elements of this priority queue to a string builder using a separator string.
Appends all elements of this priority queue 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 priority queue, separated by the string sep
.
Example:
scala> val a = LinkedList(1,2,3,4) a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4) scala> val b = new StringBuilder() b: StringBuilder = scala> a.addString(b, ", ") res0: StringBuilder = 1, 2, 3, 4
the string builder to which elements are appended.
the separator string.
the string builder b
to which elements were appended.
Appends all elements of this priority queue to a string builder using start, end, and separator strings.
Appends all elements of this priority queue to a string builder using start, end, and separator strings.
The written text 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 priority queue are separated by the string sep
.
Example:
scala> val a = LinkedList(1,2,3,4) a: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2, 3, 4) scala> val b = new StringBuilder() b: StringBuilder = scala> a.addString(b, "LinkedList(", ", ", ")") res1: StringBuilder = LinkedList(1, 2, 3, 4)
the string builder to which elements are appended.
the starting string.
the separator string.
the ending 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 an 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
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
.
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 priority queue should be compared
true
, if this priority queue can possibly equal that
, false
otherwise. The test
takes into consideration only the run-time types of objects but ignores their elements.
Removes all elements from the queue.
Removes all elements from the queue. After this operation is completed, the queue will be empty.
This method clones the priority queue.
This method clones the priority queue.
a priority queue with the same elements.
[use case] Builds a new collection by applying a partial function to all elements of this priority queue on which the function is defined.
Builds a new collection by applying a partial function to all elements of this priority queue on which the function is defined.
the element type of the returned collection.
the partial function which filters and maps the priority queue.
a new priority queue 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.
Finds the first element of the priority queue for which the given partial function is defined, and applies the partial function to it.
Finds the first element of the priority queue for which the given partial function is defined, and applies the partial function to it.
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)
The factory companion object that builds instances of class PriorityQueue.
The factory companion object that builds instances of class PriorityQueue.
(or its Iterable
superclass where class PriorityQueue is not a Seq
.)
[use case] Copies elements of this priority queue to an array.
Copies elements of this priority queue to an array.
Fills the given array xs
with at most len
elements of
this priority queue, starting at position start
.
Copying will stop once either the end of the current priority queue 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.
[use case] Copies values of this priority queue to an array.
Copies values of this priority queue to an array.
Fills the given array xs
with values of this priority queue.
Copying will stop once either the end of the current priority queue is reached,
or the end of the array is reached.
the array to fill.
[use case] Copies values of this priority queue to an array.
Copies values of this priority queue to an array.
Fills the given array xs
with values of this priority queue, beginning at index start
.
Copying will stop once either the end of the current priority queue is reached,
or the end of the array is reached.
the array to fill.
the starting index.
Copies all elements of this priority queue to a buffer.
Copies all elements of this priority queue to a buffer.
The buffer to which elements are copied.
Counts the number of elements in the priority queue which satisfy a predicate.
Counts the number of elements in the priority queue which satisfy a predicate.
the predicate used to test elements.
the number of elements satisfying the predicate p
.
Returns the element with the highest priority in the queue, and removes this element from the queue.
Returns the element with the highest priority in the queue, and removes this element from the queue.
the element with the highest priority.
Selects all elements except first n ones.
Selects all elements except first n ones.
the number of elements to drop from this priority queue.
a priority queue consisting of all elements of this priority queue except the first n
ones, or else the
empty priority queue, if this priority queue 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 priority queue consisting of all elements of this priority queue except the last n
ones, or else the
empty priority queue, if this priority queue has less than n
elements.
Drops longest prefix of elements that satisfy a predicate.
Drops longest prefix of elements that satisfy a predicate.
the longest suffix of this priority queue whose first element
does not satisfy the predicate p
.
Adds all elements to the queue.
Adds all elements to the queue.
the elements to add.
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 equality method for reference types.
Tests whether a predicate holds for some of the elements of this priority queue.
Tests whether a predicate holds for some of the elements of this priority queue.
the predicate used to test elements.
true
if the given predicate p
holds for some of the
elements of this priority queue, otherwise false
.
Selects all elements of this priority queue which satisfy a predicate.
Selects all elements of this priority queue which satisfy a predicate.
the predicate used to test elements.
a new priority queue consisting of all elements of this priority queue that satisfy the given
predicate p
. The order of the elements is preserved.
Selects all elements of this priority queue which do not satisfy a predicate.
Selects all elements of this priority queue which do not satisfy a predicate.
the predicate used to test elements.
a new priority queue consisting of all elements of this priority queue that do not satisfy the given
predicate p
. The order of the elements is 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 the first element of the priority queue satisfying a predicate, if any.
Finds the first element of the priority queue satisfying a predicate, if any.
the predicate used to test elements.
an option value containing the first element in the priority queue
that satisfies p
, or None
if none exists.
[use case] Builds a new collection by applying a function to all elements of this priority queue and using the elements of the resulting collections.
Builds a new collection by applying a function to all elements of this priority queue and using the elements of the resulting collections.
For example:
def getWords(lines: Seq[String]): Seq[String] = lines flatMap (line => line split "\\W+")
The type of the resulting collection is guided by the static type of priority queue. This might cause unexpected results sometimes. For example:
// lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set def lettersOf(words: Seq[String]) = words flatMap (word => word.toSet) // lettersOf will return a Set[Char], not a Seq def lettersOf(words: Seq[String]) = words.toSet flatMap (word => word.toSeq) // xs will be a an Iterable[Int] val xs = Map("a" -> List(11,111), "b" -> List(22,222)).flatMap(_._2) // ys will be a Map[Int, Int] val ys = Map("a" -> List(1 -> 11,1 -> 111), "b" -> List(2 -> 22,2 -> 222)).flatMap(_._2)
the element type of the returned collection.
the function to apply to each element.
a new priority queue resulting from applying the given collection-valued function
f
to each element of this priority queue and concatenating the results.
[use case] Converts this priority queue of traversable collections into a priority queue formed by the elements of these traversable collections.
Converts this priority queue of traversable collections into a priority queue formed by the elements of these traversable collections.
The resulting collection's type will be guided by the static type of priority queue. For example:
val xs = List(Set(1, 2, 3), Set(1, 2, 3)) // xs == List(1, 2, 3, 1, 2, 3) val ys = Set(List(1, 2, 3), List(3, 2, 1)) // ys == Set(1, 2, 3)
the type of the elements of each traversable collection.
a new priority queue resulting from concatenating all element priority queues.
Folds the elements of this priority queue using the specified associative binary operator.
Folds the elements of this priority queue using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
a type parameter for the binary operator, a supertype of A
.
a neutral element for the fold operation; may be added to the result
an arbitrary number of times, and must not change 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 priority queue, going left to right.
Applies a binary operator to a start value and all elements of this priority queue, going left to right.
the result type of the binary operator.
the start value.
the binary operator.
the result of inserting op
between consecutive elements of this priority queue,
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 priority queue.
Applies a binary operator to all elements of this priority queue and a start value, going right to left.
Applies a binary operator to all elements of this priority queue and a start value, going right to left.
the result type of the binary operator.
the start value.
the binary operator.
the result of inserting op
between consecutive elements of this priority queue,
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 priority queue.
Tests whether a predicate holds for all elements of this priority queue.
Tests whether a predicate holds for all elements of this priority queue.
the predicate used to test elements.
true
if the given predicate p
holds for all elements
of this priority queue, otherwise false
.
[use case] Applies a function f
to all elements of this priority queue.
Applies a function f
to all elements of this priority queue.
Note: this method underlies the implementation of most other bulk operations. Subclasses should re-implement this method if a more efficient implementation exists.
the function that is applied for its side-effect to every element.
The result of function f
is discarded.
Returns string formatted according to given format
string.
Returns string formatted according to given format
string.
Format strings are as for String.format
(@see java.lang.String.format).
The generic builder that builds instances of PriorityQueue at arbitrary element types.
The generic builder that builds instances of PriorityQueue 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 priority queue into a map of priority queues according to some discriminator function.
Partitions this priority queue into a map of priority queues 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 priority queue.
the type of keys returned by the discriminator function.
the discriminator function.
A map from keys to priority queues 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 priority queue of those elements x
for which f(x)
equals k
.
Partitions elements in fixed size priority queues.
Partitions elements in fixed size priority queues.
the number of elements per group
An iterator producing priority queues of size size
, except the
last will be truncated if the elements don't divide evenly.
scala.collection.Iterator, method grouped
Tests whether this priority queue is known to have a finite size.
Tests whether this priority queue 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.
The hashCode method always yields an error, since it is not safe to use mutable queues as keys in hash tables.
The hashCode method always yields an error, since it is not safe to use mutable queues as keys in hash tables.
never.
Returns the element with the highest priority in the queue, or throws an error if there is no element contained in the queue.
Returns the element with the highest priority in the queue, or throws an error if there is no element contained in the queue.
the element with the highest priority.
Optionally selects the first element.
Optionally selects the first element.
the first element of this priority queue if it is nonempty,
None
if it is empty.
Selects all elements except the last.
Selects all elements except the last.
a priority queue consisting of all elements of this priority queue except the last one.
if the priority queue is empty.
Iterates over the inits of this priority queue.
Iterates over the inits of this priority queue. The first value will be this
priority queue and the final one will be an empty priority queue, with the intervening
values the results of successive applications of init
.
an iterator over all the inits of this priority queue
List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)
Tests whether this priority queue is empty.
Tests whether this priority queue is empty.
true
if the priority queue contain 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.
Tests whether this priority queue can be repeatedly traversed.
Tests whether this priority queue can be repeatedly traversed.
true
Returns an iterator which yields all the elements.
Returns an iterator which yields all the elements.
Note: The order of elements returned is undefined.
If you want to traverse the elements in priority queue
order, use clone().dequeueAll.iterator
.
an iterator over all the elements.
Selects the last element.
Selects the last element.
The last element of this priority queue.
If the priority queue is empty.
Optionally selects the last element.
Optionally selects the last element.
the last element of this priority queue$ if it is nonempty,
None
if it is empty.
[use case] Builds a new collection by applying a function to all elements of this priority queue.
Builds a new collection by applying a function to all elements of this priority queue.
the element type of the returned collection.
the function to apply to each element.
a new priority queue resulting from applying the given function
f
to each element of this priority queue and collecting the results.
Creates a new builder by applying a transformation function to the results of this builder.
Creates a new builder by applying a transformation function to the results of this builder.
the type of collection returned by f
.
the transformation function.
a new builder which is the same as the current builder except that a transformation function is applied to this builder's result.
[use case] Finds the largest element.
Finds the largest element.
the largest element of this priority queue.
[use case] Finds the smallest element.
Finds the smallest element.
the smallest element of this priority queue
Displays all elements of this priority queue in a string.
Displays all elements of this priority queue in a string.
a string representation of this priority queue. In the resulting string
the string representations (w.r.t. the method toString
)
of all elements of this priority queue follow each other without any
separator string.
Displays all elements of this priority queue in a string using a separator string.
Displays all elements of this priority queue in a string using a separator string.
the separator string.
a string representation of this priority queue. In the resulting string
the string representations (w.r.t. the method toString
)
of all elements of this priority queue are separated by the string sep
.
List(1, 2, 3).mkString("|") = "1|2|3"
Displays all elements of this priority queue in a string using start, end, and separator strings.
Displays all elements of this priority queue in a string using start, end, and separator strings.
the starting string.
the separator string.
the ending string.
a string representation of this priority queue. 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 priority queue 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 PriorityQueue[A]
The builder that builds instances of type PriorityQueue[A]
Tests whether the priority queue is not empty.
Tests whether the priority queue is not empty.
true
if the priority queue 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
implicit ordering used to compare the elements of type A
.
implicit ordering used to compare the elements of type A
.
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 priority queue in two priority queues according to a predicate.
Partitions this priority queue in two priority queues according to a predicate.
the predicate on which to partition.
a pair of priority queues: the first priority queue consists of all elements that
satisfy the predicate p
and the second priority queue consists of all elements
that don't. The relative order of the elements in the resulting priority queues
is the same as in the original priority queue.
[use case] Multiplies up the elements of this collection.
Multiplies up the elements of this collection.
the product of all elements in this priority queue 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 priority queue and as result type of product
.
Examples of such types are: Long
, Float
, Double
, BigInt
.
Reduces the elements of this priority queue using the specified associative binary operator.
Reduces the elements of this priority queue using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
A type parameter for the binary operator, a supertype of A
.
A binary operator that must be associative.
The result of applying reduce operator op
between all the elements if the priority queue is nonempty.
if this priority queue is empty.
Applies a binary operator to all elements of this priority queue, going left to right.
Applies a binary operator to all elements of this priority queue, going left to right.
the result type of the binary operator.
the binary operator.
the result of inserting op
between consecutive elements of this priority queue,
going left to right:
op( op( ... op(x_1, x_2) ..., x_{n-1}), x_n)
where x_{1}, ..., x_{n}
are the elements of this priority queue.
if this priority queue is empty.
Optionally applies a binary operator to all elements of this priority queue, going left to right.
Optionally applies a binary operator to all elements of this priority queue, going left to right.
the result type of the binary operator.
the binary operator.
an option value containing the result of reduceLeft(op)
is this priority queue is nonempty,
None
otherwise.
Reduces the elements of this priority queue, if any, using the specified associative binary operator.
Reduces the elements of this priority queue, if any, using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
A type parameter for the binary operator, a supertype of A
.
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 priority queue, going right to left.
Applies a binary operator to all elements of this priority queue, going right to left.
the result type of the binary operator.
the binary operator.
the result of inserting op
between consecutive elements of this priority queue,
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 priority queue.
if this priority queue is empty.
Optionally applies a binary operator to all elements of this priority queue, going right to left.
Optionally applies a binary operator to all elements of this priority queue, going right to left.
the result type of the binary operator.
the binary operator.
an option value containing the result of reduceRight(op)
is this priority queue is nonempty,
None
otherwise.
The collection of type priority queue underlying this TraversableLike
object.
The collection of type priority queue underlying this TraversableLike
object.
By default this is implemented as the TraversableLike
object itself,
but this can be overridden.
Produces a collection from the added elements.
Produces a collection from the added elements. The builder's contents are undefined after this operation.
a collection containing the elements added to this builder.
Returns the reverse of this queue.
Returns the reverse of this queue. The priority queue that gets
returned will have an inversed ordering - if for some elements
x
and y
the original queue's ordering
had compare
returning an integer w, the new one will return -w,
assuming the original ordering abides its contract.
Note that the order of the elements will be reversed unless the
compare
method returns 0. In this case, such elements
will be subsequent, but their corresponding subinterval may be inappropriately
reversed. However, due to the compare-equals contract, they will also be equal.
A reversed priority queue.
Returns an iterator which yields all the elements in the reverse order
than that returned by the method iterator
.
Returns an iterator which yields all the elements in the reverse order
than that returned by the method iterator
.
Note: The order of elements returned is undefined.
an iterator over all elements sorted in descending order.
[use case] Checks if the other iterable collection contains the same elements in the same order as this priority queue.
Checks if the other iterable collection contains the same elements in the same order as this priority queue.
the collection to compare with.
true
, if both collections contain the same elements in the same order, false
otherwise.
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 new priority queue containing the prefix scan of the elements in this priority queue
Produces a collection containing cumulative results of applying the operator going left to right.
Produces a collection containing cumulative results of applying the operator going left to right.
the type of the elements in the resulting collection
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 cumulative results of applying the operator going right to left.
Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result.
Example:
List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)
the type of the elements in the resulting collection
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
(Changed in version 2.9.0) The behavior of scanRight
has changed. The previous behavior can be reproduced with scanRight.reverse.
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 priority queue.
The size of this priority queue.
the number of elements in this priority queue.
Gives a hint that one expects the result
of this builder
to have the same size as the given collection, plus some delta.
Gives a hint that one expects the result
of this builder
to have the same size as the given collection, plus some delta. This will
provide a hint only if the collection is known to have a cheap
size
method. Currently this is assumed to be the case if and only if
the collection is of type IndexedSeqLike
.
Some builder classes
will optimize their representation based on the hint. However,
builder implementations are still required to work correctly even if the hint is
wrong, i.e. a different number of elements is added.
the collection which serves as a hint for the result's size.
a correction to add to the coll.size
to produce the size hint.
Gives a hint that one expects the result
of this builder
to have the same size as the given collection, plus some delta.
Gives a hint that one expects the result
of this builder
to have the same size as the given collection, plus some delta. This will
provide a hint only if the collection is known to have a cheap
size
method. Currently this is assumed to be the case if and only if
the collection is of type IndexedSeqLike
.
Some builder classes
will optimize their representation based on the hint. However,
builder implementations are still required to work correctly even if the hint is
wrong, i.e. a different number of elements is added.
the collection which serves as a hint for the result's size.
Gives a hint how many elements are expected to be added
when the next result
is called.
Gives a hint how many elements are expected to be added
when the next result
is called. Some builder classes
will optimize their representation based on the hint. However,
builder implementations are still required to work correctly even if the hint is
wrong, i.e. a different number of elements is added.
the hint how many elements will be added.
Gives a hint how many elements are expected to be added
when the next result
is called, together with an upper bound
given by the size of some other collection.
Gives a hint how many elements are expected to be added
when the next result
is called, together with an upper bound
given by the size of some other collection. Some builder classes
will optimize their representation based on the hint. However,
builder implementations are still required to work correctly even if the hint is
wrong, i.e. a different number of elements is added.
the hint how many elements will be added.
the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection's size are reduced.
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
a priority queue containing the elements greater than or equal to
index from
extending up to (but not including) index until
of this priority queue.
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
the distance between the first elements of successive groups (defaults to 1)
An iterator producing priority queues of size size
, except the
last and the only element will be truncated if there are
fewer elements than size.
scala.collection.Iterator, method sliding
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 priority queues of size size
, except the
last and the only element will be truncated if there are
fewer elements than size.
scala.collection.Iterator, method sliding
Splits this priority queue into a prefix/suffix pair according to a predicate.
Splits this priority queue into a prefix/suffix pair according to a predicate.
Note: c span p
is equivalent to (but possibly more efficient than)
(c takeWhile p, c dropWhile p)
, provided the evaluation of the
predicate p
does not cause any side-effects.
a pair consisting of the longest prefix of this priority queue whose
elements all satisfy p
, and the rest of this priority queue.
Splits this priority queue into two at a given position.
Splits this priority queue 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 priority queues consisting of the first n
elements of this priority queue, and the other elements.
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 priority queue. By default the string prefix is the
simple name of the collection class priority queue.
[use case] Sums up the elements of this collection.
Sums up the elements of this collection.
the sum of all elements in this priority queue 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 priority queue and as result type of sum
.
Examples of such types are: Long
, Float
, Double
, BigInt
.
Selects all elements except the first.
Selects all elements except the first.
a priority queue consisting of all elements of this priority queue except the first one.
if the priority queue is empty.
Iterates over the tails of this priority queue.
Iterates over the tails of this priority queue. The first value will be this
priority queue and the final one will be an empty priority queue, with the intervening
values the results of successive applications of tail
.
an iterator over all the tails of this priority queue
List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)
Selects first n elements.
Selects first n elements.
the number of elements to take from this priority queue.
a priority queue consisting only of the first n
elements of this priority queue,
or else the whole priority queue, if it has less than n
elements.
Selects last n elements.
Selects last n elements.
the number of elements to take
a priority queue consisting only of the last n
elements of this priority queue, or else the
whole priority queue, if it has less than n
elements.
Takes longest prefix of elements that satisfy a predicate.
Takes longest prefix of elements that satisfy a predicate.
the longest prefix of this priority queue whose elements all satisfy
the predicate p
.
The underlying collection seen as an instance of PriorityQueue
.
The underlying collection seen as an instance of PriorityQueue
.
By default this is implemented as the current collection object itself,
but this can be overridden.
[use case] Converts this priority queue into another by copying all elements.
Converts this priority queue into another by copying all elements.
The collection type to build.
a new collection containing all elements of this priority queue.
[use case] Converts this priority queue to an array.
Converts this priority queue to an array.
an array containing all elements of this priority queue.
An ClassTag
must be available for the element type of this priority queue.
Converts this priority queue to a mutable buffer.
Converts this priority queue to a mutable buffer.
a buffer containing all elements of this priority queue.
A conversion from collections of type Repr
to PriorityQueue
objects.
A conversion from collections of type Repr
to PriorityQueue
objects.
By default this is implemented as just a cast, but this can be overridden.
Converts this priority queue to an indexed sequence.
Converts this priority queue to an indexed sequence.
an indexed sequence containing all elements of this priority queue.
Converts this priority queue to an iterable collection.
Converts this priority queue 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).
an Iterable
containing all elements of this priority queue.
Returns an Iterator over the elements in this priority queue.
Returns an Iterator over the elements in this priority queue. Will return the same Iterator if this instance is already an Iterator.
an Iterator containing all elements of this priority queue.
Converts this priority queue to a list.
Converts this priority queue to a list.
Note: the order of elements is undefined.
a list containing all elements of this priority queue.
[use case] Converts this priority queue to a map.
Converts this priority queue 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.
a map of type immutable.Map[T, U]
containing all key/value pairs of type (T, U)
of this priority queue.
Returns a regular queue containing the same elements.
Returns a regular queue containing the same elements.
Note: the order of elements is undefined.
Converts this priority queue to a sequence.
Converts this priority queue to a sequence. As with toIterable
, it's lazy
in this default implementation, as this TraversableOnce
may be
lazy and unevaluated.
a sequence containing all elements of this priority queue.
Converts this priority queue to a set.
Converts this priority queue to a set.
a set containing all elements of this priority queue.
Converts this priority queue to a stream.
Converts this priority queue to a stream.
a stream containing all elements of this priority queue.
Returns a textual representation of a queue as a string.
Returns a textual representation of a queue as a string.
the string representation of this queue.
Converts this priority queue to an unspecified Traversable.
Converts this priority queue to an unspecified Traversable. Will return the same collection if this instance is already Traversable.
a Traversable containing all elements of this priority queue.
Converts this priority queue to a Vector.
Converts this priority queue to a Vector.
a vector containing all elements of this priority queue.
Transposes this priority queue of traversable collections into a priority queue of priority queues.
Transposes this priority queue of traversable collections into a priority queue of priority queues.
the type of the elements of each traversable collection.
an implicit conversion which asserts that the
element type of this priority queue is a Traversable
.
a two-dimensional priority queue of priority queues which has as nth row the nth column of this priority queue.
(Changed in version 2.9.0) transpose
throws an IllegalArgumentException
if collections are not uniformly sized.
if all collections in this priority queue are not of the same size.
Converts this priority queue of pairs into two collections of the first and second half of each pair.
Converts this priority queue of pairs into two collections of the first and second half of each pair.
the type of the first half of the element pairs
the type of the second half of the element pairs
an implicit conversion which asserts that the element type of this priority queue is a pair.
a pair priority queues, containing the first, respectively second half of each element pair of this priority queue.
Converts this priority queue of triples into three collections of the first, second, and third element of each triple.
Converts this priority queue of triples into three collections of the first, second, and third element of each triple.
the type of the first member of the element triples
the type of the second member of the element triples
the type of the third member of the element triples
an implicit conversion which asserts that the element type of this priority queue is a triple.
a triple priority queues, containing the first, second, respectively third member of each element triple of this priority queue.
Creates a non-strict view of a slice of this priority queue.
Creates a non-strict view of a slice of this priority queue.
Note: the difference between view
and slice
is that view
produces
a view of the current priority queue, whereas slice
produces a new priority queue.
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 priority queue, starting at index from
and extending up to (but not including) index until
.
Creates a non-strict view of this priority queue.
Creates a non-strict view of this priority queue.
a non-strict view of this priority queue.
Creates a non-strict filter of this priority queue.
Creates a non-strict filter of this priority queue.
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 priority queue
which satisfy the predicate p
.
[use case] Returns a priority queue formed from this priority queue and another iterable collection by combining corresponding elements in pairs.
Returns a priority queue formed from this priority queue 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 priority queue containing pairs consisting of
corresponding elements of this priority queue and that
. The length
of the returned collection is the minimum of the lengths of this priority queue and that
.
[use case] Returns a priority queue formed from this priority queue and another iterable collection by combining corresponding elements in pairs.
Returns a priority queue formed from this priority queue 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 priority queue is shorter than that
.
the element to be used to fill up the result if that
is shorter than this priority queue.
a new priority queue containing pairs consisting of
corresponding elements of this priority queue and that
. The length
of the returned collection is the maximum of the lengths of this priority queue and that
.
If this priority queue is shorter than that
, thisElem
values are used to pad the result.
If that
is shorter than this priority queue, thatElem
values are used to pad the result.
[use case] Zips this priority queue with its indices.
Zips this priority queue with its indices.
A new priority queue containing pairs consisting of all elements of this
priority queue paired with their index. Indices start at 0
.
List("a", "b", "c").zipWithIndex = List(("a", 0), ("b", 1), ("c", 2))
(priorityQueue: MonadOps[A]).filter(p)
(priorityQueue: MonadOps[A]).flatMap(f)
(priorityQueue: MonadOps[A]).map(f)
(priorityQueue: StringAdd).self
(priorityQueue: StringFormat).self
(priorityQueue: MonadOps[A]).withFilter(p)
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
(Since version 2.10.0) use fold instead
Returns the element with the highest priority in the queue, or throws an error if there is no element contained in the queue.
Returns the element with the highest priority in the queue, or throws an error if there is no element contained in the queue.
the element with the highest priority.
(Since version 2.9.0) Use head
instead.
(priorityQueue: ArrowAssoc[PriorityQueue[A]]).x
(Since version 2.10.0) Use leftOfArrow
instead
(priorityQueue: Ensuring[PriorityQueue[A]]).x
(Since version 2.10.0) Use resultOfEnsuring
instead
This class implements priority queues using a heap. To prioritize elements of type A there must be an implicit Ordering[A] available at creation.
type of the elements in this priority queue.
1.0, 03/05/2004
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