libcxx/include/__utility/unreachable.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___UTILITY_UNREACHABLE_H
  10 #define _LIBCPP___UTILITY_UNREACHABLE_H
  11
  12 #include <__assert>
  13 #include <__config>
  14
  15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  16 #  pragma GCC system_header
  17 #endif
  18
  19 _LIBCPP_BEGIN_NAMESPACE_STD
  20
  21 _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI inline void __libcpp_unreachable() {
  22     _LIBCPP_ASSERT_UNCATEGORIZED(false, "std::unreachable() was reached");
  23     __builtin_unreachable();
  24 }
  25
  26 #if _LIBCPP_STD_VER >= 23
  27
  28 [[noreturn]] _LIBCPP_HIDE_FROM_ABI inline void unreachable() { __libcpp_unreachable(); }
  29
  30 #endif
  31
  32 _LIBCPP_END_NAMESPACE_STD
  33
  34 #endif // _LIBCPP___UTILITY_UNREACHABLE_H