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57 lines
2 KiB
C++
57 lines
2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___PSTL_HANDLE_EXCEPTION_H
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#define _LIBCPP___PSTL_HANDLE_EXCEPTION_H
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#include <__config>
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#include <__utility/forward.h>
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#include <__utility/move.h>
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#include <new> // __throw_bad_alloc
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#include <optional>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace __pstl {
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template <class _BackendFunction, class... _Args>
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_LIBCPP_HIDE_FROM_ABI auto __handle_exception_impl(_Args&&... __args) noexcept {
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return _BackendFunction{}(std::forward<_Args>(__args)...);
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}
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// This function is used to call a backend PSTL algorithm from a frontend algorithm.
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//
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// All PSTL backend algorithms return an optional denoting whether there was an
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// "infrastructure"-level failure (aka failure to allocate). This function takes
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// care of unwrapping that and throwing `bad_alloc()` in case there was a problem
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// in the underlying implementation.
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//
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// We must also be careful not to call any user code that could throw an exception
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// (such as moving or copying iterators) in here since that should terminate the
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// program, which is why we delegate to a noexcept helper below.
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template <class _BackendFunction, class... _Args>
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_LIBCPP_HIDE_FROM_ABI auto __handle_exception(_Args&&... __args) {
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auto __result = __pstl::__handle_exception_impl<_BackendFunction>(std::forward<_Args>(__args)...);
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if (__result == nullopt)
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std::__throw_bad_alloc();
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else
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return std::move(*__result);
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}
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} // namespace __pstl
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___PSTL_HANDLE_EXCEPTION_H
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