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C++ `operator bool()` is currently imported into Swift as `__convertToBool()`, which shouldn't be used by clients directly. This adds a new protocol into the C++ stdlib overlay: `CxxConvertibleToBool`, along with an intitializer for `Swift.Bool` taking an instance of `CxxConvertibleToBool`. rdar://115074954
27 lines
938 B
Swift
27 lines
938 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) 2014 - 2023 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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/// A C++ type that can be converted to a Boolean value.
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///
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/// Any C++ type that defines `operator bool()` conforms to this protocol.
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public protocol CxxConvertibleToBool {
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/// Do not implement this function manually in Swift.
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func __convertToBool() -> Bool
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}
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extension Bool {
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@inlinable
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public init<B: CxxConvertibleToBool>(fromCxx convertible: __shared B) {
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self = convertible.__convertToBool()
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}
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}
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