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45 lines
1.9 KiB
C++
45 lines
1.9 KiB
C++
//===--- Features.def - Swift Features Metaprogramming ----------*- C++ -*-===//
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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 - 2017 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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//
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// This file defines macros used for macro-metaprogramming with language
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// features.
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//
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//
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// LANGUAGE_FEATURE(FeatureName, SENumber, Description, Option)
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//
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// The LANGUAGE_FEATURE macro describes each named feature that is
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// introduced in Swift. It allows Swift code to check for a particular
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// feature with "#if $FeatureName" in source code.
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//
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// FeatureName: The name given to this feature to be used in source code,
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// e.g., AsyncAwait.
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// SENumber: The number assigned to this feature in the Swift Evolution
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// process, or 0 if there isn't one.
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// Description: A string literal describing the feature.
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// Option: either a reference to a language option in the form
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// "langOpts.<option name>" or "true" to indicate that it's always
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// enabled.
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//===----------------------------------------------------------------------===//
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#ifndef LANGUAGE_FEATURE
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# error define LANGUAGE_FEATURE before including Features.def
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#endif
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LANGUAGE_FEATURE(StaticAssert, 0, "#assert", langOpts.EnableExperimentalStaticAssert)
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LANGUAGE_FEATURE(AsyncAwait, 296, "async/await", true)
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LANGUAGE_FEATURE(MarkerProtocol, 0, "@_marker protocol", true)
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LANGUAGE_FEATURE(Actors, 0, "actors", langOpts.EnableExperimentalConcurrency)
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LANGUAGE_FEATURE(ConcurrentFunctions, 0, "@concurrent functions", true)
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LANGUAGE_FEATURE(RethrowsProtocol, 0, "@rethrows protocol", true)
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#undef LANGUAGE_FEATURE
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