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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 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
//
//===----------------------------------------------------------------------===//
/// Initializes a `Set` from unique members.
///
/// Using a builder can be faster than inserting members into an empty
/// `Set`.
@frozen
public // SPI(Foundation)
struct _SetBuilder<Element: Hashable> {
@usableFromInline
internal var _target: _NativeSet<Element>
@usableFromInline
internal let _requestedCount: Int
@inlinable
public init(count: Int) {
_target = _NativeSet(capacity: count)
_requestedCount = count
}
@inlinable
@inline(__always)
public mutating func add(member: Element) {
_precondition(_target.count < _requestedCount,
"Can't add more members than promised")
_target._unsafeInsertNew(member)
}
@inlinable
public __consuming func take() -> Set<Element> {
_precondition(_target.count == _requestedCount,
"The number of members added does not match the promised count")
return Set(_native: _target)
}
}
@available(*, unavailable)
extension _SetBuilder: Sendable {}
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