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// Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)
// SPDX-License-Identifier: BSL-1.0
#pragma once
/**\file
* Polyfill `std::unreachable`
*
* We need something like `std::unreachable` to tell the compiler that
* some macros, e.g. `FAIL` or `SKIP`, do not continue execution in normal
* manner, and should handle it as such, e.g. not warn if there is no return
* from non-void function after a `FAIL` or `SKIP`.
*/
#include <exception>
#if defined( __cpp_lib_unreachable ) && __cpp_lib_unreachable > 202202L
# include <utility>
namespace Catch {
namespace Detail {
using Unreachable = std::unreachable;
}
} // namespace Catch
#else // vv If we do not have std::unreachable, we implement something similar
namespace Catch {
namespace Detail {
[[noreturn]]
inline void Unreachable() noexcept {
# if defined( NDEBUG )
# if defined( _MSC_VER ) && !defined( __clang__ )
__assume( false );
# elif defined( __GNUC__ )
__builtin_unreachable();
# else // vv platform without known optimization hint
std::terminate();
# endif
# else // ^^ NDEBUG
// For non-release builds, we prefer termination on bug over UB
std::terminate();
# endif //
}
} // namespace Detail
} // end namespace Catch
#endif
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