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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.
35 lines
1007 B
Swift
35 lines
1007 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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#if !SWIFT_STDLIB_STATIC_PRINT
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import Swift
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extension _Deque: CustomStringConvertible {
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/// A textual representation of this instance.
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var description: String {
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var result = "["
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var first = true
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for item in self {
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if first {
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first = false
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} else {
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result += ", "
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}
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print(item, terminator: "", to: &result)
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}
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result += "]"
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return result
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}
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}
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#endif |