1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2007, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id: ListSet.scala 9554 2007-01-04 16:30:16 +0000 (Thu, 04 Jan 2007) odersky $
package scala.collection.immutable
/** This class implements empty immutable maps
* @author Martin Oderskty
* @version 1.0, 019/01/2007
*/
[serializable]
class Set4[A](elem1: A, elem2: A, elem3: A, elem4: A) extends Set[A] {
def empty[C]: Set[C] = new EmptySet[C]
def size: Int = 4
def contains(elem: A): Boolean =
elem == elem1 || elem == elem2 || elem == elem3 || elem == elem4
def + (elem: A): Set[A] =
if (contains(elem)) this
else HashSet(elem1, elem2, elem3, elem4, elem)
def - (elem: A): Set[A] =
if (elem == elem1) new Set3(elem2, elem3, elem4)
else if (elem == elem2) new Set3(elem1, elem3, elem4)
else if (elem == elem3) new Set3(elem1, elem2, elem4)
else if (elem == elem4) new Set3(elem1, elem2, elem3)
else this
def elements: Iterator[A] =
Iterator.fromValues(elem1, elem2, elem3, elem4)
}
|
