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e9d4687e31
* De-underscore @frozen for enums * Add @frozen for structs, deprecate @_fixed_layout for them * Switch usage from _fixed_layout to frozen
46 lines
1.4 KiB
Swift
46 lines
1.4 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 `Set` 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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/// `Set`.
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@frozen
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public // SPI(Foundation)
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struct _SetBuilder<Element: Hashable> {
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@usableFromInline
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internal var _target: _NativeSet<Element>
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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 = _NativeSet(capacity: count)
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_requestedCount = count
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}
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@inlinable
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@inline(__always)
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public mutating func add(member: Element) {
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_precondition(_target.count < _requestedCount,
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"Can't add more members than promised")
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_target._unsafeInsertNew(member)
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}
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@inlinable
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public __consuming func take() -> Set<Element> {
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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 Set(_native: _target)
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}
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}
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