mirror of
https://github.com/apple/swift.git
synced 2026-06-20 15:42:51 +02:00
Doug Gregor
453277eb74
Functions like withUnsafeBufferPointer are, by themselves, safe to call. It's only the operations on the unsafe pointers passed into the closure that are the safety issue. This was the intent spelled out in SE-0458 but was not fully realized in the library. Fixes rdar://174519372.
62 lines
1.9 KiB
Swift
62 lines
1.9 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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import SwiftShims
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extension String: Hashable {
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/// Hashes the essential components of this value by feeding them into the
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/// given hasher.
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///
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/// - Parameter hasher: The hasher to use when combining the components
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/// of this instance.
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public func hash(into hasher: inout Hasher) {
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if _fastPath(self._guts.isNFCFastUTF8) {
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self._guts.withFastUTF8 {
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unsafe hasher.combine(bytes: UnsafeRawBufferPointer($0))
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}
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hasher.combine(0xFF as UInt8) // terminator
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} else {
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_gutsSlice._normalizedHash(into: &hasher)
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}
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}
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}
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extension StringProtocol {
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/// Hashes the essential components of this value by feeding them into the
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/// given hasher.
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///
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/// - Parameter hasher: The hasher to use when combining the components
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/// of this instance.
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@_specialize(where Self == String)
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@_specialize(where Self == Substring)
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public func hash(into hasher: inout Hasher) {
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_gutsSlice._normalizedHash(into: &hasher)
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}
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}
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extension _StringGutsSlice {
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@_effects(releasenone) @inline(never) // slow-path
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internal func _normalizedHash(into hasher: inout Hasher) {
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if self.isNFCFastUTF8 {
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unsafe self.withFastUTF8 {
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unsafe hasher.combine(bytes: UnsafeRawBufferPointer($0))
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}
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} else {
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_withNFCCodeUnits {
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hasher.combine($0)
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}
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}
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hasher.combine(0xFF as UInt8) // terminator
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}
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}
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