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c3bc84e680
Add __consuming and __owned to Set and Dictionary members where applicable. Ignore compiler intrinsics for casting for now — their ARC behavior is covered by unit tests that need to be updated.
43 lines
1.3 KiB
Swift
43 lines
1.3 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 - 2018 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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/// Initializes a `Dictionary` from unique members.
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///
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/// Using a builder can be faster than inserting members into an empty
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/// `Dictionary`.
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@_fixed_layout
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public // SPI(Foundation)
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struct _DictionaryBuilder<Key: Hashable, Value> {
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@usableFromInline
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internal var _target: _NativeDictionary<Key, Value>
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@usableFromInline
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internal let _requestedCount: Int
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@inlinable
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public init(count: Int) {
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_target = _NativeDictionary(capacity: count)
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_requestedCount = count
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}
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@inlinable
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public mutating func add(key newKey: Key, value: Value) {
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_target.insertNew(key: newKey, value: value)
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}
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@inlinable
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public __consuming func take() -> Dictionary<Key, Value> {
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_precondition(_target.count == _requestedCount,
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"The number of members added does not match the promised count")
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return Dictionary(_native: _target)
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}
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}
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