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
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Collections open source project
//
// Copyright (c) 2023 - 2024 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
//
//===----------------------------------------------------------------------===//
@usableFromInline
@frozen // Not really! This module isn't ABI stable.
internal struct _RopeVersion {
// FIXME: Replace this probabilistic mess with atomics when Swift gets its act together.
@usableFromInline internal var _value: UInt
@inlinable
internal init() {
var rng = SystemRandomNumberGenerator()
_value = rng.next()
}
@inlinable
internal init(_ value: UInt) {
self._value = value
}
}
extension _RopeVersion: Equatable {
@inlinable
internal static func ==(left: Self, right: Self) -> Bool {
left._value == right._value
}
}
extension _RopeVersion {
@inlinable
internal mutating func bump() {
_value &+= 1
}
@inlinable
internal mutating func reset() {
var rng = SystemRandomNumberGenerator()
_value = rng.next()
}
}
|
