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___ALGORITHM_PSTL_STABLE_SORT_H
10 #define _LIBCPP___ALGORITHM_PSTL_STABLE_SORT_H
11 
12 #include <__algorithm/pstl_backend.h>
13 #include <__config>
14 #include <__functional/operations.h>
15 #include <__type_traits/enable_if.h>
16 #include <__type_traits/is_execution_policy.h>
17 #include <__type_traits/remove_cvref.h>
18 #include <__utility/empty.h>
19 #include <__utility/move.h>
20 #include <optional>
21 
22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
23 #  pragma GCC system_header
24 #endif
25 
26 _LIBCPP_PUSH_MACROS
27 #include <__undef_macros>
28 
29 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
30 
31 _LIBCPP_BEGIN_NAMESPACE_STD
32 
33 template <class _ExecutionPolicy,
34           class _RandomAccessIterator,
35           class _Comp                                         = less<>,
36           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
37           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
38 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__empty> __stable_sort(
39     _ExecutionPolicy&&, _RandomAccessIterator&& __first, _RandomAccessIterator&& __last, _Comp&& __comp = {}) noexcept {
40   using _Backend = typename __select_backend<_RawPolicy>::type;
41   return std::__pstl_stable_sort<_RawPolicy>(_Backend{}, std::move(__first), std::move(__last), std::move(__comp));
42 }
43 
44 template <class _ExecutionPolicy,
45           class _RandomAccessIterator,
46           class _Comp                                         = less<>,
47           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
48           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
49 _LIBCPP_HIDE_FROM_ABI void stable_sort(
50     _ExecutionPolicy&& __policy, _RandomAccessIterator __first, _RandomAccessIterator __last, _Comp __comp = {}) {
51   if (!std::__stable_sort(__policy, std::move(__first), std::move(__last), std::move(__comp)))
52     std::__throw_bad_alloc();
53 }
54 
55 _LIBCPP_END_NAMESPACE_STD
56 
57 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
58 
59 _LIBCPP_POP_MACROS
60 
61 #endif // _LIBCPP___ALGORITHM_PSTL_STABLE_SORT_H
62