libcxx/include/__algorithm/pstl_stable_sort.h

   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 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
  27
  28 _LIBCPP_BEGIN_NAMESPACE_STD
  29
  30 template <class _ExecutionPolicy,
  31           class _RandomAccessIterator,
  32           class _Comp                                         = less<>,
  33           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
  34           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
  35 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__empty> __stable_sort(
  36     _ExecutionPolicy&&, _RandomAccessIterator&& __first, _RandomAccessIterator&& __last, _Comp&& __comp = {}) noexcept {
  37   using _Backend = typename __select_backend<_RawPolicy>::type;
  38   return std::__pstl_stable_sort<_RawPolicy>(_Backend{}, std::move(__first), std::move(__last), std::move(__comp));
  39 }
  40
  41 template <class _ExecutionPolicy,
  42           class _RandomAccessIterator,
  43           class _Comp                                         = less<>,
  44           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
  45           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
  46 _LIBCPP_HIDE_FROM_ABI void stable_sort(
  47     _ExecutionPolicy&& __policy, _RandomAccessIterator __first, _RandomAccessIterator __last, _Comp __comp = {}) {
  48   if (!std::__stable_sort(__policy, std::move(__first), std::move(__last), std::move(__comp)))
  49     std::__throw_bad_alloc();
  50 }
  51
  52 _LIBCPP_END_NAMESPACE_STD
  53
  54 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
  55
  56 #endif // _LIBCPP___ALGORITHM_PSTL_STABLE_SORT_H