Scala Standard Library2.12.3-1 < Back
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# Packages

-  package root

  This is the documentation for the Scala standard library.

  This is the documentation for the Scala standard library.

  #### Package structure

  The scala package contains core types like `Int`, `Float`, `Array` or `Option` which are accessible in all Scala compilation units without explicit qualification or imports.

  Notable packages include:

  - `scala.collection` and its sub-packages contain Scala's collections framework
    - `scala.collection.immutable` - Immutable, sequential data-structures such as `Vector`, `List`, `Range`, `HashMap` or `HashSet`
    - `scala.collection.mutable` - Mutable, sequential data-structures such as `ArrayBuffer`, `StringBuilder`, `HashMap` or `HashSet`
    - `scala.collection.concurrent` - Mutable, concurrent data-structures such as `TrieMap`
    - `scala.collection.parallel.immutable` - Immutable, parallel data-structures such as `ParVector`, `ParRange`, `ParHashMap` or `ParHashSet`
    - `scala.collection.parallel.mutable` - Mutable, parallel data-structures such as `ParArray`, `ParHashMap`, `ParTrieMap` or `ParHashSet`
  - `scala.concurrent` - Primitives for concurrent programming such as `Futures` and `Promises`
  - `scala.io` - Input and output operations
  - `scala.math` - Basic math functions and additional numeric types like `BigInt` and `BigDecimal`
  - `scala.sys` - Interaction with other processes and the operating system
  - `scala.util.matching` - Regular expressions

  Other packages exist. See the complete list on the right.

  Additional parts of the standard library are shipped as separate libraries. These include:

  - `scala.reflect` - Scala's reflection API (scala-reflect.jar)
  - `scala.xml` - XML parsing, manipulation, and serialization (scala-xml.jar)
  - `scala.swing` - A convenient wrapper around Java's GUI framework called Swing (scala-swing.jar)
  - `scala.util.parsing` - Parser combinators (scala-parser-combinators.jar)

  #### Automatic imports

  Identifiers in the scala package and the `scala.Predef` object are always in scope by default.

  Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example, `List` is an alias for `scala.collection.immutable.List`.

  Other aliases refer to classes provided by the underlying platform. For example, on the JVM, `String` is an alias for `java.lang.String`.

  Definition Classes
    root
-  package scala

  Core Scala types.

  Core Scala types. They are always available without an explicit import.

  Definition Classes
    root
-  package collection

  Contains the base traits and objects needed to use and extend Scala's collection library.

  Contains the base traits and objects needed to use and extend Scala's collection library.

  #### Guide

  A detailed guide for using the collections library is available at http://docs.scala-lang.org/overviews/collections/introduction.html. Developers looking to extend the collections library can find a description of its architecture at http://docs.scala-lang.org/overviews/core/architecture-of-scala-collections.html.

  #### Using Collections

  It is convenient to treat all collections as either a scala.collection.Traversable or scala.collection.Iterable, as these traits define the vast majority of operations on a collection.

  Collections can, of course, be treated as specifically as needed, and the library is designed to ensure that the methods that transform collections will return a collection of the same type:

      scala> val array = Array(1,2,3,4,5,6)
      array: Array[Int] = Array(1, 2, 3, 4, 5, 6)

      scala> array map { _.toString }
      res0: Array[String] = Array(1, 2, 3, 4, 5, 6)

      scala> val list = List(1,2,3,4,5,6)
      list: List[Int] = List(1, 2, 3, 4, 5, 6)

      scala> list map { _.toString }
      res1: List[String] = List(1, 2, 3, 4, 5, 6)

  #### Creating Collections

  The most common way to create a collection is to use its companion object as a factory. The three most commonly used collections are scala.collection.Seq, scala.collection.immutable.Set, and scala.collection.immutable.Map. They can be used directly as shown below since their companion objects are all available as type aliases in either the scala package or in `scala.Predef`. New collections are created like this:

      scala> val seq = Seq(1,2,3,4,1)
      seq: Seq[Int] = List(1, 2, 3, 4, 1)

      scala> val set = Set(1,2,3,4,1)
      set: scala.collection.immutable.Set[Int] = Set(1, 2, 3, 4)

      scala> val map = Map(1 -> "one", 2 -> "two", 3 -> "three", 2 -> "too")
      map: scala.collection.immutable.Map[Int,String] = Map(1 -> one, 2 -> too, 3 -> three)

  It is also typical to prefer the scala.collection.immutable collections over those in scala.collection.mutable; the types aliased in the `scala.Predef` object are the immutable versions.

  Also note that the collections library was carefully designed to include several implementations of each of the three basic collection types. These implementations have specific performance characteristics which are described in the guide.

  The concrete parallel collections also have specific performance characteristics which are described in the parallel collections guide

  ##### Converting to and from Java Collections

  The scala.collection.JavaConverters object provides a collection of decorators that allow converting between Scala and Java collections using `asScala` and `asJava` methods.

  Definition Classes
    scala
-  package parallel

  Package object for parallel collections.

  Package object for parallel collections.

  Definition Classes
    collection
-  package mutable
  Definition Classes
    parallel
- LazyCombiner
- ParArray
- ParFlatHashTable
- ParHashMap
- ParHashSet
- ParHashTable
- ParIterable
- ParMap
- ParMapLike
- ParSeq
- ParSet
- ParSetLike
- ParTrieMap
- ResizableParArrayCombiner
- UnrolledParArrayCombiner

t

scala.collection.parallel.mutable

# ResizableParArrayCombiner 

###
Companion object ResizableParArrayCombiner

#### trait ResizableParArrayCombiner[T] extends LazyCombiner[T, ParArray[T], ExposedArrayBuffer[T]]

An array combiner that uses a chain of arraybuffers to store elements.

Source
  ResizableParArrayCombiner.scala

Linear Supertypes
LazyCombiner[T, ParArray[T], ExposedArrayBuffer[T]], Combiner[T, ParArray[T]], Parallel, Sizing, Builder[T, ParArray[T]], Growable[T], Clearable, AnyRef, Any
Type Hierarchy
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Ordering

1. Alphabetic
2. By Inheritance

Inherited

1. ResizableParArrayCombiner
2. LazyCombiner
3. Combiner
4. Parallel
5. Sizing
6. Builder
7. Growable
8. Clearable
9. AnyRef
10. Any

Implicitly

1. by CollectionsHaveToParArray
2. by any2stringadd
3. by StringFormat
4. by Ensuring
5. by ArrowAssoc

1. Hide All
2. Show All

Visibility

1. Public
2. All

### Type Members

1.  class CopyChainToArray extends Task[Unit, CopyChainToArray]

### Abstract Value Members

1.  abstract val chain: ArrayBuffer[ExposedArrayBuffer[T]]
   Definition Classes
     LazyCombiner

### Concrete Value Members

1.  final def !=(arg0: Any): Boolean

   Test two objects for inequality.

   Test two objects for inequality.

   returns

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

   Definition Classes
     AnyRef → Any
2.  final def ##(): Int

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

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

   returns

     a hash value consistent with ==

   Definition Classes
     AnyRef → Any
3.  def +(other: String): String
   Implicit
     This member is added by an implicit conversion from ResizableParArrayCombiner[T] to any2stringadd[ResizableParArrayCombiner[T]] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd
4.  def ++=(xs: TraversableOnce[T]): ResizableParArrayCombiner.this.type

   adds all elements produced by a TraversableOnce to this growable collection.

   adds all elements produced by a TraversableOnce to this growable collection.

   xs

     the TraversableOnce producing the elements to add.

   returns

     the growable collection itself.

   Definition Classes
     Growable
5.  def +=(elem: T): ResizableParArrayCombiner.this.type

   Adds a single element to the builder.

   Adds a single element to the builder.

   elem

     the element to be added.

   returns

     the builder itself.

   Definition Classes
     LazyCombiner → Builder → Growable
6.  def +=(elem1: T, elem2: T, elems: T*): ResizableParArrayCombiner.this.type

   adds two or more elements to this growable collection.

   adds two or more elements to this growable collection.

   elem1

     the first element to add.

   elem2

     the second element to add.

   elems

     the remaining elements to add.

   returns

     the growable collection itself

   Definition Classes
     Growable
7.  def ->[B](y: B): (ResizableParArrayCombiner[T], B)
   Implicit
     This member is added by an implicit conversion from ResizableParArrayCombiner[T] to ArrowAssoc[ResizableParArrayCombiner[T]] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()
8.  final def ==(arg0: Any): Boolean

   The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

   The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

   returns

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

   Definition Classes
     AnyRef → Any
9.  val _combinerTaskSupport: TaskSupport
   Definition Classes
     Combiner
   Annotations
     @transient() @volatile()
10.  def allocateAndCopy: ParArray[T]

    Method that allocates the data structure and copies elements into it using `size` and `chain` members.

    Method that allocates the data structure and copies elements into it using `size` and `chain` members.

    Definition Classes
      ResizableParArrayCombiner → LazyCombiner
11.  final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type `T0`.

    Cast the receiver object to be of type `T0`.

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

    returns

      the receiver object.

    Definition Classes
      Any
    Exceptions thrown

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

12.  def canBeShared: Boolean

    Returns `true` if this combiner has a thread-safe `+=` and is meant to be shared across several threads constructing the collection.

    Returns `true` if this combiner has a thread-safe `+=` and is meant to be shared across several threads constructing the collection.

    By default, this method returns `false`.

    Definition Classes
      Combiner
13.  def clear(): Unit

    Clears the contents of this builder.

    Clears the contents of this builder. After execution of this method the builder will contain no elements.

    Definition Classes
      LazyCombiner → Builder → Growable → Clearable
14.  def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the `clone` method is platform dependent.

    returns

      a copy of the receiver object.

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

      not specified by SLS as a member of AnyRef

15.  def combine[N <: T, NewTo >: ParArray[T]](other: Combiner[N, NewTo]): Combiner[N, NewTo]

    Combines the contents of the receiver builder and the `other` builder, producing a new builder containing both their elements.

    Combines the contents of the receiver builder and the `other` builder, producing a new builder containing both their elements.

    This method may combine the two builders by copying them into a larger collection, by producing a lazy view that gets evaluated once `result` is invoked, or use a merge operation specific to the data structure in question.

    Note that both the receiver builder and `other` builder become invalidated after the invocation of this method, and should be cleared (see `clear`) if they are to be used again.

    Also, combining two combiners `c1` and `c2` for which `c1 eq c2` is `true`, that is, they are the same objects in memory:

        c1.combine(c2)

    always does nothing and returns `c1`.

    N

      the type of elements contained by the `other` builder

    NewTo

      the type of collection produced by the `other` builder

    other

      the other builder

    returns

      the parallel builder containing both the elements of this and the `other` builder

    Definition Classes
      LazyCombiner → Combiner
16.  def combinerTaskSupport: TaskSupport
    Definition Classes
      Combiner
17.  def combinerTaskSupport_=(cts: TaskSupport): Unit
    Definition Classes
      Combiner
18.  def ensuring(cond: (ResizableParArrayCombiner[T]) ⇒ Boolean, msg: ⇒ Any): ResizableParArrayCombiner[T]
    Implicit
      This member is added by an implicit conversion from ResizableParArrayCombiner[T] to Ensuring[ResizableParArrayCombiner[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
19.  def ensuring(cond: (ResizableParArrayCombiner[T]) ⇒ Boolean): ResizableParArrayCombiner[T]
    Implicit
      This member is added by an implicit conversion from ResizableParArrayCombiner[T] to Ensuring[ResizableParArrayCombiner[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
20.  def ensuring(cond: Boolean, msg: ⇒ Any): ResizableParArrayCombiner[T]
    Implicit
      This member is added by an implicit conversion from ResizableParArrayCombiner[T] to Ensuring[ResizableParArrayCombiner[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
21.  def ensuring(cond: Boolean): ResizableParArrayCombiner[T]
    Implicit
      This member is added by an implicit conversion from ResizableParArrayCombiner[T] to Ensuring[ResizableParArrayCombiner[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
22.  final def eq(arg0: AnyRef): Boolean

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

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

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

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

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

    returns

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

    Definition Classes
      AnyRef
23.  def equals(arg0: Any): Boolean

    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to `eq`.

    See also `equals` in scala.Any.

    returns

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

    Definition Classes
      AnyRef → Any
24.  def finalize(): Unit

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

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

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

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

      not specified by SLS as a member of AnyRef

25.  def formatted(fmtstr: String): String

    Returns string formatted according to given `format` string.

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

    Implicit
      This member is added by an implicit conversion from ResizableParArrayCombiner[T] to StringFormat[ResizableParArrayCombiner[T]] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()
26.  final def getClass(): Class[_]

    Returns the runtime class representation of the object.

    Returns the runtime class representation of the object.

    returns

      a class object corresponding to the runtime type of the receiver.

    Definition Classes
      AnyRef → Any
27.  def hashCode(): Int

    The hashCode method for reference types.

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

    returns

      the hash code value for this object.

    Definition Classes
      AnyRef → Any
28.  final def isInstanceOf[T0]: Boolean

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

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

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

    returns

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

    Definition Classes
      Any
29.  val lastbuff: ExposedArrayBuffer[T]
    Definition Classes
      LazyCombiner
30.  def mapResult[NewTo](f: (ParArray[T]) ⇒ NewTo): Builder[T, NewTo]

    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.

    NewTo

      the type of collection returned by `f`.

    f

      the transformation function.

    returns

      a new builder which is the same as the current builder except that a transformation function is applied to this builder's result.

    Definition Classes
      Builder
    Note

      The original builder should no longer be used after `mapResult` is called.

31.  final def ne(arg0: AnyRef): Boolean

    Equivalent to `!(this eq that)`.

    Equivalent to `!(this eq that)`.

    returns

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

    Definition Classes
      AnyRef
32.  final def newLazyCombiner(c: ArrayBuffer[ExposedArrayBuffer[T]]): ResizableParArrayCombiner[T]
    Definition Classes
      ResizableParArrayCombiner → LazyCombiner
33.  final def notify(): Unit

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

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

    Definition Classes
      AnyRef
    Note

      not specified by SLS as a member of AnyRef

34.  final def notifyAll(): Unit

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

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

    Definition Classes
      AnyRef
    Note

      not specified by SLS as a member of AnyRef

35.  def result(): ParArray[T]

    Produces a collection from the added elements.

    Produces a collection from the added elements. This is a terminal operation: the builder's contents are undefined after this operation, and no further methods should be called.

    returns

      a collection containing the elements added to this builder.

    Definition Classes
      LazyCombiner → Builder
36.  def resultWithTaskSupport: ParArray[T]

    Constructs the result and sets the appropriate tasksupport object to the resulting collection if this is applicable.

    Constructs the result and sets the appropriate tasksupport object to the resulting collection if this is applicable.

    Definition Classes
      Combiner
37.  def size: Int
    Definition Classes
      LazyCombiner → Sizing
38.  def sizeHint(sz: Int): Unit

    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.

    Definition Classes
      ResizableParArrayCombiner → Builder
39.  def sizeHint(coll: TraversableLike[_, _], delta: Int): Unit

    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.

    coll

      the collection which serves as a hint for the result's size.

    delta

      a correction to add to the `coll.size` to produce the size hint.

    Definition Classes
      Builder
40.  def sizeHint(coll: TraversableLike[_, _]): Unit

    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, which is determined by calling `sizeHint`.

    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.

    coll

      the collection which serves as a hint for the result's size.

    Definition Classes
      Builder
41.  def sizeHintBounded(size: Int, boundingColl: TraversableLike[_, _]): Unit

    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.

    size

      the hint how many elements will be added.

    boundingColl

      the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection's size are reduced.

    Definition Classes
      Builder
42.  final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
      AnyRef
43.  def toParArray: ParArray[T]
    Implicit
      This member is added by an implicit conversion from ResizableParArrayCombiner[T] to CollectionsHaveToParArray[ResizableParArrayCombiner[T], T] performed by method CollectionsHaveToParArray in scala.collection.parallel. This conversion will take place only if an implicit value of type (ResizableParArrayCombiner[T]) ⇒ GenTraversableOnce[T] is in scope.
    Definition Classes
      CollectionsHaveToParArray
44.  def toString(): String

    Creates a String representation of this object.

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

    returns

      a String representation of the object.

    Definition Classes
      ResizableParArrayCombiner → AnyRef → Any
45.  final def wait(): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
46.  final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
47.  final def wait(arg0: Long): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
48.  def →[B](y: B): (ResizableParArrayCombiner[T], B)
    Implicit
      This member is added by an implicit conversion from ResizableParArrayCombiner[T] to ArrowAssoc[ResizableParArrayCombiner[T]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc

### Inherited from LazyCombiner[T, ParArray[T], ExposedArrayBuffer[T]]

### Inherited from Combiner[T, ParArray[T]]

### Inherited from Parallel

### Inherited from Sizing

### Inherited from Builder[T, ParArray[T]]

### Inherited from Growable[T]

### Inherited from Clearable

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion CollectionsHaveToParArray from ResizableParArrayCombiner[T] to CollectionsHaveToParArray[ResizableParArrayCombiner[T], T]

### Inherited by implicit conversion any2stringadd from ResizableParArrayCombiner[T] to any2stringadd[ResizableParArrayCombiner[T]]

### Inherited by implicit conversion StringFormat from ResizableParArrayCombiner[T] to StringFormat[ResizableParArrayCombiner[T]]

### Inherited by implicit conversion Ensuring from ResizableParArrayCombiner[T] to Ensuring[ResizableParArrayCombiner[T]]

### Inherited by implicit conversion ArrowAssoc from ResizableParArrayCombiner[T] to ArrowAssoc[ResizableParArrayCombiner[T]]

### Ungrouped