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
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2011, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.collection
package mutable
import generic._
import BitSetLike.{LogWL, updateArray}
/** A class for mutable bitsets.
*
* $bitsetinfo
*
* @see [[http://docs.scala-lang.org/overviews/collections/concrete-mutable-collection-classes.html#mutable_bitsets "Scala's Collection Library overview"]]
* section on `Mutable Bitsets` for more information.
*
* @define Coll `BitSet`
* @define coll bitset
* @define thatinfo the class of the returned collection. In the standard library configuration,
* `That` is always `BitSet[B]` because an implicit of type `CanBuildFrom[BitSet, B, BitSet]`
* is defined in object `BitSet`.
* @define bfinfo an implicit value of class `CanBuildFrom` which determines the
* result class `That` from the current representation type `Repr`
* and the new element type `B`. This is usually the `canBuildFrom` value
* defined in object `BitSet`.
* @define orderDependent
* @define orderDependentFold
* @define mayNotTerminateInf
* @define willNotTerminateInf
*/
@SerialVersionUID(8483111450368547763L)
class BitSet(protected var elems: Array[Long]) extends AbstractSet[Int]
with SortedSet[Int]
with scala.collection.BitSet
with BitSetLike[BitSet]
with SetLike[Int, BitSet]
with Serializable {
override def empty = BitSet.empty
/** Creates the bitset of a certain initial size.
*
* @param initSize initial size of the bitset.
*/
def this(initSize: Int) = this(new Array[Long]((initSize + 63) >> 6 max 1))
def this() = this(0)
protected def nwords = elems.length
protected def word(idx: Int): Long =
if (idx < nwords) elems(idx) else 0L
private def updateWord(idx: Int, w: Long) {
if (idx >= nwords) {
var newlen = nwords
while (idx >= newlen) newlen = newlen * 2
val elems1 = new Array[Long](newlen)
Array.copy(elems, 0, elems1, 0, nwords)
elems = elems1
}
elems(idx) = w
}
protected def fromBitMaskNoCopy(words: Array[Long]): BitSet = new BitSet(words)
override def add(elem: Int): Boolean = {
require(elem >= 0)
if (contains(elem)) false
else {
val idx = elem >> LogWL
updateWord(idx, word(idx) | (1L << elem))
true
}
}
override def remove(elem: Int): Boolean = {
require(elem >= 0)
if (contains(elem)) {
val idx = elem >> LogWL
updateWord(idx, word(idx) & ~(1L << elem))
true
} else false
}
def += (elem: Int): this.type = { add(elem); this }
def -= (elem: Int): this.type = { remove(elem); this }
override def clear() {
elems = new Array[Long](elems.length)
}
/** Wraps this bitset as an immutable bitset backed by the array of bits
* of this bitset.
*
* @note Subsequent changes in this bitset will be reflected in the returned immutable bitset.
*
* @return an immutable set containing all the elements of this set.
*/
def toImmutable = immutable.BitSet.fromBitMaskNoCopy(elems)
override def clone(): BitSet = {
val elems1 = new Array[Long](elems.length)
Array.copy(elems, 0, elems1, 0, elems.length)
new BitSet(elems1)
}
}
/** $factoryInfo
* @define coll bitset
* @define Coll `BitSet`
*/
object BitSet extends BitSetFactory[BitSet] {
def empty: BitSet = new BitSet
/** A growing builder for mutable Sets. */
def newBuilder: Builder[Int, BitSet] = new GrowingBuilder[Int, BitSet](empty)
/** $bitsetCanBuildFrom */
implicit def canBuildFrom: CanBuildFrom[BitSet, Int, BitSet] = bitsetCanBuildFrom
/** A bitset containing all the bits in an array */
def fromBitMask(elems: Array[Long]): BitSet = {
val len = elems.length
val a = new Array[Long](len)
Array.copy(elems, 0, a, 0, len)
new BitSet(a)
}
/** A bitset containing all the bits in an array, wrapping the existing
* array without copying.
*/
def fromBitMaskNoCopy(elems: Array[Long]): BitSet = new BitSet(elems)
}
|