v1/__utility/unreachable.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___UTILITY_UNREACHABLE_H
0010 #define _LIBCPP___UTILITY_UNREACHABLE_H
0011
0012 #include <__assert>
0013 #include <__config>
0014
0015 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0016 #  pragma GCC system_header
0017 #endif
0018
0019 _LIBCPP_BEGIN_NAMESPACE_STD
0020
0021 [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI inline void __libcpp_unreachable() {
0022   _LIBCPP_ASSERT_INTERNAL(false, "std::unreachable() was reached");
0023   __builtin_unreachable();
0024 }
0025
0026 #if _LIBCPP_STD_VER >= 23
0027
0028 [[noreturn]] _LIBCPP_HIDE_FROM_ABI inline void unreachable() { __libcpp_unreachable(); }
0029
0030 #endif
0031
0032 _LIBCPP_END_NAMESPACE_STD
0033
0034 #endif // _LIBCPP___UTILITY_UNREACHABLE_H