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0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008 
0009 #ifndef _LIBCPP___ALGORITHM_RANGES_STABLE_SORT_H
0010 #define _LIBCPP___ALGORITHM_RANGES_STABLE_SORT_H
0011 
0012 #include <__algorithm/iterator_operations.h>
0013 #include <__algorithm/make_projected.h>
0014 #include <__algorithm/stable_sort.h>
0015 #include <__config>
0016 #include <__functional/identity.h>
0017 #include <__functional/invoke.h>
0018 #include <__functional/ranges_operations.h>
0019 #include <__iterator/concepts.h>
0020 #include <__iterator/iterator_traits.h>
0021 #include <__iterator/next.h>
0022 #include <__iterator/projected.h>
0023 #include <__iterator/sortable.h>
0024 #include <__ranges/access.h>
0025 #include <__ranges/concepts.h>
0026 #include <__ranges/dangling.h>
0027 #include <__utility/forward.h>
0028 #include <__utility/move.h>
0029 
0030 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0031 #  pragma GCC system_header
0032 #endif
0033 
0034 _LIBCPP_PUSH_MACROS
0035 #include <__undef_macros>
0036 
0037 #if _LIBCPP_STD_VER >= 20
0038 
0039 _LIBCPP_BEGIN_NAMESPACE_STD
0040 
0041 namespace ranges {
0042 struct __stable_sort {
0043   template <class _Iter, class _Sent, class _Comp, class _Proj>
0044   _LIBCPP_HIDE_FROM_ABI static _Iter __stable_sort_fn_impl(_Iter __first, _Sent __last, _Comp& __comp, _Proj& __proj) {
0045     auto __last_iter = ranges::next(__first, __last);
0046 
0047     auto&& __projected_comp = std::__make_projected(__comp, __proj);
0048     std::__stable_sort_impl<_RangeAlgPolicy>(std::move(__first), __last_iter, __projected_comp);
0049 
0050     return __last_iter;
0051   }
0052 
0053   template <random_access_iterator _Iter, sentinel_for<_Iter> _Sent, class _Comp = ranges::less, class _Proj = identity>
0054     requires sortable<_Iter, _Comp, _Proj>
0055   _LIBCPP_HIDE_FROM_ABI _Iter operator()(_Iter __first, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const {
0056     return __stable_sort_fn_impl(std::move(__first), std::move(__last), __comp, __proj);
0057   }
0058 
0059   template <random_access_range _Range, class _Comp = ranges::less, class _Proj = identity>
0060     requires sortable<iterator_t<_Range>, _Comp, _Proj>
0061   _LIBCPP_HIDE_FROM_ABI borrowed_iterator_t<_Range>
0062   operator()(_Range&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
0063     return __stable_sort_fn_impl(ranges::begin(__r), ranges::end(__r), __comp, __proj);
0064   }
0065 };
0066 
0067 inline namespace __cpo {
0068 inline constexpr auto stable_sort = __stable_sort{};
0069 } // namespace __cpo
0070 } // namespace ranges
0071 
0072 _LIBCPP_END_NAMESPACE_STD
0073 
0074 #endif // _LIBCPP_STD_VER >= 20
0075 
0076 _LIBCPP_POP_MACROS
0077 
0078 #endif // _LIBCPP___ALGORITHM_RANGES_STABLE_SORT_H