8597748c42
...of87369ad7b8"Use std::unreachable if available". (Unfortunately, Clang didn't warn about the thus meaningless uses of O3TL_UNREACHABLE, presumably due to <978cca9f49> "Suppress all -Wunused-value warnings from macro body expansions.") (While at it, and as the expansion of O3TL_UNREACHABLE is now a nice full expression, wrap it in parentheses, as is common best practice for such macro definitions.) Change-Id: I555e6716ebb66172add686521446d90db6054845 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/130729 Tested-by: Jenkins Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef INCLUDED_O3TL_UNREACHABLE_HXX
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#define INCLUDED_O3TL_UNREACHABLE_HXX
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#include <sal/config.h>
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#include <cassert>
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#include <utility>
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// An approximation of C++23 std::unreachable
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// (<http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p0627r6.pdf> "Function to mark
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// unreachable code").
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#if defined __cpp_lib_unreachable
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#define O3TL_UNREACHABLE (::std::unreachable())
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#else
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// This fallback implementation is inspired by LLVM's LLVM_BUILTIN_UNREACHABLE
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// (llvm/include/llvm/Support/Compiler.h).
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#if defined _MSC_VER
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#define O3TL_UNREACHABLE_detail __assume(false)
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#else // assuming Clang or GCC with support for:
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#define O3TL_UNREACHABLE_detail __builtin_unreachable()
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#endif
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#define O3TL_UNREACHABLE \
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do \
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{ \
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assert(false); \
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O3TL_UNREACHABLE_detail; \
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} while (false)
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#endif
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#endif
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/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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