Packages

object Accumulator

Contains factory methods to build Accumulators.

Note that the Accumulator object itself is not a factory, but it is implicitly convert to a factory according to the element type, see Accumulator.toFactory.

This allows passing the Accumulator object as argument when a collection.Factory, and the implicit Accumulator.AccumulatorFactoryShape instance is used to build a specialized Accumulator according to the element type:

scala> val intAcc = Accumulator(1,2,3)
intAcc: scala.collection.convert.IntAccumulator = IntAccumulator(1, 2, 3)

scala> val anyAccc = Accumulator("K")
anyAccc: scala.collection.convert.AnyAccumulator[String] = AnyAccumulator(K)

scala> val intAcc2 = List(1,2,3).to(Accumulator)
intAcc2: scala.jdk.IntAccumulator = IntAccumulator(1, 2, 3)

scala> val anyAcc2 = List("K").to(Accumulator)
anyAcc2: scala.jdk.AnyAccumulator[String] = AnyAccumulator(K)
Source
Accumulator.scala
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Type Members

  1. sealed trait AccumulatorFactoryShape[A, C] extends AnyRef

    An implicit AccumulatorFactoryShape is used in Accumulator factory method to return specialized variants according to the element type.

  2. sealed trait LowPriorityAccumulatorFactoryShape extends AnyRef

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. 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
  4. def apply[A, C](elems: A*)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): C

    Creates an Accumulator with the specified elements.

    Creates an Accumulator with the specified elements.

    A

    the type of the Accumulator's elements

    C

    the (inferred) specific type of the Accumulator

    elems

    the elements of the created Accumulator

    returns

    a new Accumulator with elements elems

  5. 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.

  6. def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

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

    not specified by SLS as a member of AnyRef

  7. def concat[A, C](xss: Iterable[A]*)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): C

    Concatenates all argument collections into a single Accumulator.

    Concatenates all argument collections into a single Accumulator.

    xss

    the collections that are to be concatenated.

    returns

    the concatenation of all the collections.

  8. def empty[A, C](implicit canAccumulate: AccumulatorFactoryShape[A, C]): C

    An empty collection

    An empty collection

    A

    the type of the Accumulator's elements

  9. 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
  10. def equals(arg0: AnyRef): 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
  11. def fill[A, C](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(elem: => A)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): AnyAccumulator[AnyAccumulator[AnyAccumulator[AnyAccumulator[C]]]]

    Produces a five-dimensional Accumulator containing the results of some element computation a number of times.

    Produces a five-dimensional Accumulator containing the results of some element computation a number of times.

    n1

    the number of elements in the 1st dimension

    n2

    the number of elements in the 2nd dimension

    n3

    the number of elements in the 3rd dimension

    n4

    the number of elements in the 4th dimension

    n5

    the number of elements in the 5th dimension

    elem

    the element computation

    returns

    An Accumulator that contains the results of n1 x n2 x n3 x n4 x n5 evaluations of elem.

  12. def fill[A, C](n1: Int, n2: Int, n3: Int, n4: Int)(elem: => A)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): AnyAccumulator[AnyAccumulator[AnyAccumulator[C]]]

    Produces a four-dimensional Accumulator containing the results of some element computation a number of times.

    Produces a four-dimensional Accumulator containing the results of some element computation a number of times.

    n1

    the number of elements in the 1st dimension

    n2

    the number of elements in the 2nd dimension

    n3

    the number of elements in the 3rd dimension

    n4

    the number of elements in the 4th dimension

    elem

    the element computation

    returns

    An Accumulator that contains the results of n1 x n2 x n3 x n4 evaluations of elem.

  13. def fill[A, C](n1: Int, n2: Int, n3: Int)(elem: => A)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): AnyAccumulator[AnyAccumulator[C]]

    Produces a three-dimensional Accumulator containing the results of some element computation a number of times.

    Produces a three-dimensional Accumulator containing the results of some element computation a number of times.

    n1

    the number of elements in the 1st dimension

    n2

    the number of elements in the 2nd dimension

    n3

    the number of elements in the 3rd dimension

    elem

    the element computation

    returns

    An Accumulator that contains the results of n1 x n2 x n3 evaluations of elem.

  14. def fill[A, C](n1: Int, n2: Int)(elem: => A)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): AnyAccumulator[C]

    Produces a two-dimensional Accumulator containing the results of some element computation a number of times.

    Produces a two-dimensional Accumulator containing the results of some element computation a number of times.

    n1

    the number of elements in the 1st dimension

    n2

    the number of elements in the 2nd dimension

    elem

    the element computation

    returns

    An Accumulator that contains the results of n1 x n2 evaluations of elem.

  15. def fill[A, C](n: Int)(elem: => A)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): C

    Produces an Accumulator containing the results of some element computation a number of times.

    Produces an Accumulator containing the results of some element computation a number of times.

    n

    the number of elements contained in the Accumulator.

    elem

    the element computation

    returns

    An Accumulator that contains the results of n evaluations of elem.

  16. def finalize(): Unit

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

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

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

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

    not specified by SLS as a member of AnyRef

  17. def from[A, C](source: IterableOnce[A])(implicit canAccumulate: AccumulatorFactoryShape[A, C]): C

    Creates a target Accumulator from an existing source collection

    Creates a target Accumulator from an existing source collection

    A

    the type of the Accumulator’s elements

    C

    the (inferred) specific type of the Accumulator

    source

    Source collection

    returns

    a new Accumulator with the elements of source

  18. final def getClass(): Class[_ <: AnyRef]

    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
    Annotations
    @native()
  19. 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
    Annotations
    @native()
  20. final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object has the same erasure as T0.

    Test whether the dynamic type of the receiver object has the same erasure as T0.

    Depending on what T0 is, the test is done in one of the below ways:

    • T0 is a non-parameterized class type, e.g. BigDecimal: this method returns true if the value of the receiver object is a BigDecimal or a subtype of BigDecimal.
    • T0 is a parameterized class type, e.g. List[Int]: this method returns true if the value of the receiver object is some List[X] for any X. For example, List(1, 2, 3).isInstanceOf[List[String]] will return true.
    • T0 is some singleton type x.type or literal x: this method returns this.eq(x). For example, x.isInstanceOf[1] is equivalent to x.eq(1)
    • T0 is an intersection X with Y or X & Y: this method is equivalent to x.isInstanceOf[X] && x.isInstanceOf[Y]
    • T0 is a union X | Y: this method is equivalent to x.isInstanceOf[X] || x.isInstanceOf[Y]
    • T0 is a type parameter or an abstract type member: this method is equivalent to isInstanceOf[U] where U is T0's upper bound, Any if T0 is unbounded. For example, x.isInstanceOf[A] where A is an unbounded type parameter will return true for any value of x.

    This is exactly equivalent to the type pattern _: T0

    returns

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

    Definition Classes
    Any
    Note

    due to the unexpectedness of List(1, 2, 3).isInstanceOf[List[String]] returning true and x.isInstanceOf[A] where A is a type parameter or abstract member returning true, these forms issue a warning.

  21. def iterate[A, C](start: A, len: Int)(f: (A) => A)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): C

    Produces an Accumulator containing repeated applications of a function to a start value.

    Produces an Accumulator containing repeated applications of a function to a start value.

    start

    the start value of the Accumulator

    len

    the number of elements contained in the Accumulator

    f

    the function that's repeatedly applied

    returns

    an Accumulator with len values in the sequence start, f(start), f(f(start)), ...

  22. 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
  23. def newBuilder[A, C](implicit canAccumulate: AccumulatorFactoryShape[A, C]): Builder[A, C]

    A

    the type of the Accumulator’s elements

    C

    the specific type of the Accumulator

    returns

    A builder for Accumulator objects.

  24. 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
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  25. 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
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  26. def range[A, C](start: A, end: A, step: A)(implicit arg0: Integral[A], canAccumulate: AccumulatorFactoryShape[A, C]): C

    Produces an Accumulator containing equally spaced values in some integer interval.

    Produces an Accumulator containing equally spaced values in some integer interval.

    start

    the start value of the Accumulator

    end

    the end value of the Accumulator (the first value NOT contained)

    step

    the difference between successive elements of the Accumulator (must be positive or negative)

    returns

    an Accumulator with values start, start + step, ... up to, but excluding end

  27. def range[A, C](start: A, end: A)(implicit arg0: Integral[A], canAccumulate: AccumulatorFactoryShape[A, C]): C

    Produces an Accumulator containing a sequence of increasing of integers.

    Produces an Accumulator containing a sequence of increasing of integers.

    start

    the first element of the Accumulator

    end

    the end value of the Accumulator (the first value NOT contained)

    returns

    an Accumulator with values start, start + 1, ..., end - 1

  28. final def synchronized[T0](arg0: => T0): T0

    Executes the code in body with an exclusive lock on this.

    Executes the code in body with an exclusive lock on this.

    returns

    the result of body

    Definition Classes
    AnyRef
  29. def tabulate[A, C](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(f: (Int, Int, Int, Int, Int) => A)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): AnyAccumulator[AnyAccumulator[AnyAccumulator[AnyAccumulator[C]]]]

    Produces a five-dimensional Accumulator containing values of a given function over ranges of integer values starting from 0.

    Produces a five-dimensional Accumulator containing values of a given function over ranges of integer values starting from 0.

    n1

    the number of elements in the 1st dimension

    n2

    the number of elements in the 2nd dimension

    n3

    the number of elements in the 3rd dimension

    n4

    the number of elements in the 4th dimension

    n5

    the number of elements in the 5th dimension

    f

    The function computing element values

    returns

    An Accumulator consisting of elements f(i1, i2, i3, i4, i5) for 0 <= i1 < n1, 0 <= i2 < n2, 0 <= i3 < n3, 0 <= i4 < n4, and 0 <= i5 < n5.

  30. def tabulate[A, C](n1: Int, n2: Int, n3: Int, n4: Int)(f: (Int, Int, Int, Int) => A)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): AnyAccumulator[AnyAccumulator[AnyAccumulator[C]]]

    Produces a four-dimensional Accumulator containing values of a given function over ranges of integer values starting from 0.

    Produces a four-dimensional Accumulator containing values of a given function over ranges of integer values starting from 0.

    n1

    the number of elements in the 1st dimension

    n2

    the number of elements in the 2nd dimension

    n3

    the number of elements in the 3rd dimension

    n4

    the number of elements in the 4th dimension

    f

    The function computing element values

    returns

    An Accumulator consisting of elements f(i1, i2, i3, i4) for 0 <= i1 < n1, 0 <= i2 < n2, 0 <= i3 < n3, and 0 <= i4 < n4.

  31. def tabulate[A, C](n1: Int, n2: Int, n3: Int)(f: (Int, Int, Int) => A)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): AnyAccumulator[AnyAccumulator[C]]

    Produces a three-dimensional Accumulator containing values of a given function over ranges of integer values starting from 0.

    Produces a three-dimensional Accumulator containing values of a given function over ranges of integer values starting from 0.

    n1

    the number of elements in the 1st dimension

    n2

    the number of elements in the 2nd dimension

    n3

    the number of elements in the 3rd dimension

    f

    The function computing element values

    returns

    An Accumulator consisting of elements f(i1, i2, i3) for 0 <= i1 < n1, 0 <= i2 < n2, and 0 <= i3 < n3.

  32. def tabulate[A, C](n1: Int, n2: Int)(f: (Int, Int) => A)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): AnyAccumulator[C]

    Produces a two-dimensional Accumulator containing values of a given function over ranges of integer values starting from 0.

    Produces a two-dimensional Accumulator containing values of a given function over ranges of integer values starting from 0.

    n1

    the number of elements in the 1st dimension

    n2

    the number of elements in the 2nd dimension

    f

    The function computing element values

    returns

    An Accumulator consisting of elements f(i1, i2) for 0 <= i1 < n1 and 0 <= i2 < n2.

  33. def tabulate[A, C](n: Int)(f: (Int) => A)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): C

    Produces an Accumulator containing values of a given function over a range of integer values starting from 0.

    Produces an Accumulator containing values of a given function over a range of integer values starting from 0.

    n

    The number of elements in the Accumulator

    f

    The function computing element values

    returns

    An Accumulator consisting of elements f(0), ..., f(n -1)

  34. implicit def toFactory[A, C](sa: Accumulator.type)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): Factory[A, C]
  35. 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
    AnyRef → Any
  36. def unfold[A, S, C](init: S)(f: (S) => Option[(A, S)])(implicit canAccumulate: AccumulatorFactoryShape[A, C]): C

    Produces an Accumulator that uses a function f to produce elements of type A and update an internal state of type S.

    Produces an Accumulator that uses a function f to produce elements of type A and update an internal state of type S.

    A

    Type of the elements

    S

    Type of the internal state

    C

    Type (usually inferred) of the Accumulator

    init

    State initial value

    f

    Computes the next element (or returns None to signal the end of the collection)

    returns

    an Accumulator that produces elements using f until f returns None

  37. final def wait(): Unit

    See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.

    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
    Note

    not specified by SLS as a member of AnyRef

  38. final def wait(arg0: Long, arg1: Int): Unit

    See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-

    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
    Note

    not specified by SLS as a member of AnyRef

  39. final def wait(arg0: Long): Unit

    See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.

    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
    Note

    not specified by SLS as a member of AnyRef

  40. object AccumulatorFactoryShape extends LowPriorityAccumulatorFactoryShape

Inherited from AnyRef

Inherited from Any

Ungrouped