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| 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___PSTL_CPU_ALGOS_STABLE_SORT_H |
| 10 | #define _LIBCPP___PSTL_CPU_ALGOS_STABLE_SORT_H |
| 11 | |
| 12 | #include <__algorithm/stable_sort.h> |
| 13 | #include <__config> |
| 14 | #include <__pstl/backend_fwd.h> |
| 15 | #include <__pstl/cpu_algos/cpu_traits.h> |
| 16 | #include <__type_traits/is_execution_policy.h> |
| 17 | #include <__utility/empty.h> |
| 18 | #include <optional> |
| 19 | |
| 20 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 21 | # pragma GCC system_header |
| 22 | #endif |
| 23 | |
| 24 | #if _LIBCPP_STD_VER >= 17 |
| 25 | |
| 26 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 27 | namespace __pstl { |
| 28 | |
| 29 | template <class _Backend, class _RawExecutionPolicy> |
| 30 | struct __cpu_parallel_stable_sort { |
| 31 | template <class _Policy, class _RandomAccessIterator, class _Comp> |
| 32 | _LIBCPP_HIDE_FROM_ABI optional<__empty> |
| 33 | operator()(_Policy&&, _RandomAccessIterator __first, _RandomAccessIterator __last, _Comp __comp) const noexcept { |
| 34 | if constexpr (__is_parallel_execution_policy_v<_RawExecutionPolicy>) { |
| 35 | return __cpu_traits<_Backend>::__stable_sort( |
| 36 | __first, __last, __comp, [](_RandomAccessIterator __g_first, _RandomAccessIterator __g_last, _Comp __g_comp) { |
| 37 | std::stable_sort(__g_first, __g_last, __g_comp); |
| 38 | }); |
| 39 | } else { |
| 40 | std::stable_sort(__first, __last, __comp); |
| 41 | return __empty{}; |
| 42 | } |
| 43 | } |
| 44 | }; |
| 45 | |
| 46 | } // namespace __pstl |
| 47 | _LIBCPP_END_NAMESPACE_STD |
| 48 | |
| 49 | #endif // _LIBCPP_STD_VER >= 17 |
| 50 | |
| 51 | #endif // _LIBCPP___PSTL_CPU_ALGOS_STABLE_SORT_H |
| 52 |
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