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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifndef INCLUDED_O3TL_UNREACHABLE_HXX
#define INCLUDED_O3TL_UNREACHABLE_HXX
#include <sal/config.h>
#include <cassert>
#include <utility>
// An approximation of C++23 std::unreachable
// (<http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p0627r6.pdf> "Function to mark
// unreachable code").
#if defined __cpp_lib_unreachable
#define O3TL_UNREACHABLE (::std::unreachable())
#else
// This fallback implementation is inspired by LLVM's LLVM_BUILTIN_UNREACHABLE
// (llvm/include/llvm/Support/Compiler.h).
#if defined _MSC_VER
#define O3TL_UNREACHABLE_detail __assume(false)
#else // assuming Clang or GCC with support for:
#define O3TL_UNREACHABLE_detail __builtin_unreachable()
#endif
#define O3TL_UNREACHABLE \
do \
{ \
assert(false); \
O3TL_UNREACHABLE_detail; \
} while (false)
#endif
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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