Packages

object HashSet extends ImmutableSetFactory[HashSet] with Serializable

This object provides a set of operations needed to create immutable.HashSet values.

Source
HashSet.scala
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  1. HashSet
  2. Serializable
  3. Serializable
  4. ImmutableSetFactory
  5. SetFactory
  6. GenericSeqCompanion
  7. GenSetFactory
  8. GenericCompanion
  9. AnyRef
  10. Any
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Type Members

  1. type Coll = HashSet[_]

    The underlying collection type with unknown element type

    The underlying collection type with unknown element type

    Attributes
    protected[this]
    Definition Classes
    GenericCompanion
  2. class HashSet1[A] extends LeafHashSet[A]
  3. class HashTrieSet[A] extends HashSet[A]

    A branch node of the HashTrieSet with at least one and up to 32 children.

    A branch node of the HashTrieSet with at least one and up to 32 children.

    A

    the type of the elements contained in this hash set. How levels work: When looking up or adding elements, the part of the hashcode that is used to address the children array depends on how deep we are in the tree. This is accomplished by having a level parameter in all internal methods that starts at 0 and increases by 5 (32 = 25) every time we go deeper into the tree. hashcode (binary): 00000000000000000000000000000000 level=0 (depth=0) level=5 (depth=1) level=10 (depth=2) ^^^^ ... Be careful: a non-toplevel HashTrieSet is not a self-contained set, so e.g. calling contains on it will not work! It relies on its depth in the Trie for which part of a hash to use to address the children, but this information (the level) is not stored due to storage efficiency reasons but has to be passed explicitly! How bitmap and elems correspond: A naive implementation of a HashTrieSet would always have an array of size 32 for children and leave the unused children empty (null). But that would be very wasteful regarding memory. Instead, only non-empty children are stored in elems, and the bitmap is used to encode which elem corresponds to which child bucket. The lowest 1 bit corresponds to the first element, the second-lowest to the second, etc. bitmap (binary): 00010000000000000000100000000000 elems: [a,b] children: ---b----------------a-----------

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](elems: A*): HashSet[A]

    Creates a collection with the specified elements.

    Creates a collection with the specified elements.

    A

    the type of the collection's elements

    elems

    the elements of the created collection

    returns

    a new collection with elements elems

    Definition Classes
    GenericCompanion
  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. implicit def canBuildFrom[A]: CanBuildFrom[Coll, A, HashSet[A]]

    The standard CanBuildFrom instance for immutable.HashSet objects.

  7. 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( ... ) @native()
    Note

    not specified by SLS as a member of AnyRef

  8. def elemHashCode(key: Any): Int
    Attributes
    protected
  9. def empty[A]: HashSet[A]

    An empty collection of type Set[A]

    An empty collection of type Set[A]

    A

    the type of the set's elements

    Definition Classes
    ImmutableSetFactoryGenericCompanion
  10. 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
  11. 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
  12. 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

  13. 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
    Annotations
    @native()
  14. 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()
  15. final def improve(hcode: Int): Int
    Attributes
    protected
  16. 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
  17. 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
  18. def newBuilder[A]: Builder[A, HashSet[A]]

    The default builder for immutable.HashSet objects.

    The default builder for immutable.HashSet objects.

    A

    the type of the immutable hash set's elements

    Definition Classes
    HashSetImmutableSetFactoryGenSetFactoryGenericCompanion
  19. 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

  20. 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

  21. def setCanBuildFrom[A]: CanBuildFrom[HashSet[_], A, HashSet[A]]

    The standard CanBuildFrom instance for Set objects.

    The standard CanBuildFrom instance for Set objects.

    Definition Classes
    GenSetFactory
  22. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  23. 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
  24. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  25. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  26. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()

Inherited from Serializable

Inherited from java.io.Serializable

Inherited from ImmutableSetFactory[HashSet]

Inherited from SetFactory[HashSet]

Inherited from GenericSeqCompanion[HashSet]

Inherited from GenSetFactory[HashSet]

Inherited from GenericCompanion[HashSet]

Inherited from AnyRef

Inherited from Any

Ungrouped