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
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2021 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
public struct BitArray {
public var words: [UInt64]
public var size: UInt16
public init(size: Int) {
self.words = .init(repeating: 0, count: (size + 63) / 64)
self.size = UInt16(size)
}
public subscript(_ bit: Int) -> Bool {
get {
return words[bit / 64] & (1 << (bit % 64)) != 0
}
set {
if newValue {
words[bit / 64] |= 1 << (bit % 64)
} else {
words[bit / 64] &= ~(1 << (bit % 64))
}
}
}
public mutating func insert(_ bit: Int) -> Bool {
let oldData = words[bit / 64]
words[bit / 64] |= 1 << (bit % 64)
return oldData & (1 << (bit % 64)) == 0
}
}
|
