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- //===--- Fallthrough.h - switch fallthrough annotation macro ----*- C++ -*-===//
- //
- // This source file is part of the Swift.org open source project
- //
- // Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
- // Licensed under Apache License v2.0 with Runtime Library Exception
- //
- // See http://swift.org/LICENSE.txt for license information
- // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
- //
- //===----------------------------------------------------------------------===//
- //
- // This file defines a SWIFT_FALLTHROUGH macro to annotate intentional
- // fallthrough between switch cases. For compilers that support the
- // "clang::fallthrough" attribute, it expands to an empty statement with the
- // attribute applied; otherwise, it expands to just an empty statement.
- //
- //===----------------------------------------------------------------------===//
- #ifndef SWIFT_BASIC_FALLTHROUGH_H
- #define SWIFT_BASIC_FALLTHROUGH_H
- #ifndef __has_attribute
- # define __has_attribute(x) 0
- #endif
- #ifndef __has_cpp_attribute
- # define __has_cpp_attribute(x) 0
- #endif
- #if __has_attribute(fallthrough)
- # define SWIFT_FALLTHROUGH [[clang::fallthrough]]
- #elif __has_cpp_attribute(clang::fallthrough)
- # define SWIFT_FALLTHROUGH [[clang::fallthrough]]
- #else
- # define SWIFT_FALLTHROUGH
- #endif
- #endif // SWIFT_BASIC_FALLTHROUGH_H
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