Accumulator

Companion class Accumulator

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

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.
sealed trait LowPriorityAccumulatorFactoryShape extends AnyRef

Value Members

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
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
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
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
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.
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(classOf[java.lang.CloneNotSupportedException]) @native()
Note
not specified by SLS as a member of AnyRef
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.
def empty[A, C](implicit canAccumulate: AccumulatorFactoryShape[A, C]): C
An empty collection
An empty collection
A
the type of the Accumulator's elements
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
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
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.
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.
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.
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.
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.
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
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
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()
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()
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
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)), ...
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
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.
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
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
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
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
final def synchronized[T0](arg0: => T0): T0
Definition Classes
AnyRef
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.
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.
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.
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.
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)
implicit def toFactory[A, C](sa: Accumulator.type)(implicit canAccumulate: AccumulatorFactoryShape[A, C]): Factory[A, C]
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
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
final def wait(): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
final def wait(arg0: Long, arg1: Int): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
final def wait(arg0: Long): Unit
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException]) @native()
object AccumulatorFactoryShape extends LowPriorityAccumulatorFactoryShape

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Accumulator

Companion class Accumulator

object Accumulator

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Accumulator

Companion class Accumulator

object Accumulator

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Accumulator