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34c2b0e50d
`Swift.String` can be initialized from any other type with an unlabeled initializer, which is either going to use the `CustomStringConvertible` conformance, or reflection. We would like clients to use the most suitable initializer, which is the one that takes `std.string` as a parameter. For instance, that allows us to attach a doc comment to the initializer. This change makes the initializer unlabeled to make sure it is chosed by overload resolution when a client invokes `String(myCxxString)`.
61 lines
1.6 KiB
Swift
61 lines
1.6 KiB
Swift
//===--- CxxStringConversion.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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import TestsUtils
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import CxxStdlibPerformance
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import CxxStdlib
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let cxxStringSize = 1_000_000
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let swiftStringSize = 25_000
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var cxxString: std.string? = nil
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var swiftString: String? = nil
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public let benchmarks = [
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BenchmarkInfo(
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name: "CxxStringConversion.swift.to.cxx",
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runFunction: run_swiftToCxx,
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tags: [.validation, .bridging, .cxxInterop],
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setUpFunction: {
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swiftString = String(repeating: "abc012", count: swiftStringSize / 6)
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}),
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BenchmarkInfo(
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name: "CxxStringConversion.cxx.to.swift",
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runFunction: run_cxxToSwift,
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tags: [.validation, .bridging, .cxxInterop],
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setUpFunction: {
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cxxString = std.string()
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for i in 0..<cxxStringSize {
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let char = std.string.value_type(65 + i % 10) // latin letters A-J
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cxxString!.push_back(char)
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}
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}),
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]
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@inline(never)
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public func run_swiftToCxx(_ n: Int) {
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let str = swiftString!
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for _ in 0..<n {
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let x = std.string(str)
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blackHole(x)
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}
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}
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@inline(never)
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public func run_cxxToSwift(_ n: Int) {
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let str = cxxString!
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for _ in 0..<n {
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let x = String(str)
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blackHole(x)
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}
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}
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