Scala Library
scala.collection.immutable

class EmptySet
[source: scala/collection/immutable/EmptySet.scala]
@serializable

class EmptySet[A]
extends Set[A]
This class implements empty immutable sets
Author
Martin Oderskty
Version
1.0, 019/01/2007
Method Summary
def + (elem : A) : Set[A]
Create a new set with an additional element.
def - (elem : A) : Set[A]
Remove a single element from a set.
def contains (elem : A) : Boolean
Checks if this set contains element elem.
def elements : Iterator[A]
Creates a new iterator over all elements contained in this object.
def empty [C] : Set[C]
def size : Int
Returns the number of elements in this set.
Methods inherited from Set
+, ++, ++, incl, incl, -, --, --, excl, excl, intersect, **, map, flatMap, filter
Methods inherited from Set
apply, isEmpty, subsetOf, *, equals, hashCode, toArray, stringPrefix
Methods inherited from Collection
toString
Methods inherited from Iterable
concat, ++, partition, takeWhile, dropWhile, take, drop, foreach, forall, exists, find, findIndexOf, indexOf, foldLeft, foldRight, /:, :\, reduceLeft, reduceRight, copyToBuffer, sameElements, toList, toSeq, toStream, mkString, mkString, mkString, addString, addString, addString, copyToArray, projection, hasDefiniteSize
Methods inherited from Function1
compose, andThen
Methods inherited from AnyRef
getClass, clone, notify, notifyAll, wait, wait, wait, finalize, ==, !=, eq, ne, synchronized
Methods inherited from Any
==, !=, isInstanceOf, asInstanceOf
Method Details
def empty[C] : Set[C]
Returns
an empty set of arbitrary element type
Overrides
Set.empty
def size : Int
Returns the number of elements in this set.
Returns
number of set elements.
def contains(elem : A) : Boolean
Checks if this set contains element elem.
Parameters
elem - the element to check for membership.
Returns
true iff elem is contained in this set.
def +(elem : A) : Set[A]
Create a new set with an additional element.
Overrides
Set.+
def -(elem : A) : Set[A]
Remove a single element from a set.
Parameters
elem - the element to be removed
Returns
a new set with the element removed.
Overrides
Set.-
def elements : Iterator[A]
Creates a new iterator over all elements contained in this object.
Returns
the new iterator
Scala Library