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919eea7045
This adds a protocol to the C++ standard library overlay which will improve the ergonomics of `std::map` and `std::unordered_map` when used from Swift code. As of now, `CxxDictionary` adds a subscript with an optional return type that mimics the subscript of `Swift.Dictionary`. Similar to https://github.com/apple/swift/pull/63244.
38 lines
1.1 KiB
Swift
38 lines
1.1 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 - 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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public protocol CxxDictionary<Key, Value> {
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associatedtype Key
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associatedtype Value
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associatedtype RawIterator: UnsafeCxxInputIterator
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where RawIterator.Pointee: CxxPair<Key, Value>
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/// Do not implement this function manually in Swift.
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func __findUnsafe(_ key: Key) -> RawIterator
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/// Do not implement this function manually in Swift.
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func __endUnsafe() -> RawIterator
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}
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extension CxxDictionary {
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@inlinable
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public subscript(key: Key) -> Value? {
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get {
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let iter = __findUnsafe(key)
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guard iter != __endUnsafe() else {
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return nil
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}
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return iter.pointee.second
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}
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}
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}
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