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# Motivation For AsyncStream we created a custom internal Deque implementation to use for the buffering. This implementation was relatively bare-bones compared to the one in swift-collections. Furthermore, it lacked some methods that we need to implement the new `AsyncStream` APIs that support producer backpressure. # Modification This PR copies over the Deque implementation of swift-collections and makes it internal and non-inlinable. # Result We now have a fully functional Deque.
27 lines
982 B
Swift
27 lines
982 B
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) 2021 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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//
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//===----------------------------------------------------------------------===//
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/// This file is copied from swift-collections and should not be modified here.
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/// Rather all changes should be made to swift-collections and copied back.
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import Swift
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extension _Deque: Equatable where Element: Equatable {
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/// Returns a Boolean value indicating whether two values are equal. Two
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/// deques are considered equal if they contain the same elements in the same
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/// order.
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///
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/// - Complexity: O(`min(left.count, right.count)`)
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static func ==(left: Self, right: Self) -> Bool {
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return left.elementsEqual(right)
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}
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}
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