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40 lines
1.3 KiB
C++
40 lines
1.3 KiB
C++
//===- Fallthrough.h - switch fallthrough annotation macro ------*- 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 - 2015 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 http://swift.org/LICENSE.txt for license information
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// See http://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 filed defines a SWIFT_FALLTHROUGH macro to annotate intentional
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// fallthrough between switch cases. For compilers that support the
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// "clang::fallthrough" attribute, it expands to an empty statement with the
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// attribute applied; otherwise, it expands to just an empty statement.
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//
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//===----------------------------------------------------------------------===//
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#ifndef __SWIFT_FALLTHROUGH_H__
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#define __SWIFT_FALLTHROUGH_H__
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#ifndef __has_attribute
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# define __has_attribute(x) 0
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#endif
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#ifndef __has_cpp_attribute
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# define __has_cpp_attribute(x) 0
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#endif
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#if __has_attribute(fallthrough)
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# define SWIFT_FALLTHROUGH [[clang::fallthrough]]
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#elif __has_cpp_attribute(clang::fallthrough)
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# define SWIFT_FALLTHROUGH [[clang::fallthrough]]
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#else
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# define SWIFT_FALLTHROUGH
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#endif
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#endif
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