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
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2023 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
//
//===----------------------------------------------------------------------===//
internal struct BufferViewIterator<Element> {
var curPointer: UnsafeRawPointer
let endPointer: UnsafeRawPointer
init(startPointer: UnsafeRawPointer, endPointer: UnsafeRawPointer) {
self.curPointer = startPointer
self.endPointer = endPointer
}
init(from start: BufferViewIndex<Element>, to end: BufferViewIndex<Element>) {
self.init(startPointer: start._rawValue, endPointer: end._rawValue)
}
}
extension BufferViewIterator: IteratorProtocol {
mutating func next() -> Element? {
guard curPointer < endPointer else { return nil }
defer {
curPointer = curPointer.advanced(by: MemoryLayout<Element>.stride)
}
if _isPOD(Element.self) {
return curPointer.loadUnaligned(as: Element.self)
}
return curPointer.load(as: Element.self)
}
func peek() -> Element? {
guard curPointer < endPointer else { return nil }
if _isPOD(Element.self) {
return curPointer.loadUnaligned(as: Element.self)
}
return curPointer.load(as: Element.self)
}
mutating func advance() {
guard curPointer < endPointer else { return }
curPointer = curPointer.advanced(by: MemoryLayout<Element>.stride)
}
}
|
