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_RANGES_INPLACE_MERGE_H
10 #define _LIBCPP___ALGORITHM_RANGES_INPLACE_MERGE_H
11 
12 #include <__algorithm/inplace_merge.h>
13 #include <__algorithm/iterator_operations.h>
14 #include <__algorithm/make_projected.h>
15 #include <__config>
16 #include <__functional/identity.h>
17 #include <__functional/invoke.h>
18 #include <__functional/ranges_operations.h>
19 #include <__iterator/concepts.h>
20 #include <__iterator/iterator_traits.h>
21 #include <__iterator/next.h>
22 #include <__iterator/projected.h>
23 #include <__iterator/sortable.h>
24 #include <__ranges/access.h>
25 #include <__ranges/concepts.h>
26 #include <__ranges/dangling.h>
27 #include <__utility/forward.h>
28 #include <__utility/move.h>
29 
30 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
31 #  pragma GCC system_header
32 #endif
33 
34 #if _LIBCPP_STD_VER >= 20
35 
36 _LIBCPP_BEGIN_NAMESPACE_STD
37 
38 namespace ranges {
39 namespace __inplace_merge {
40 
41 struct __fn {
42   template <class _Iter, class _Sent, class _Comp, class _Proj>
43   _LIBCPP_HIDE_FROM_ABI static constexpr auto
44   __inplace_merge_impl(_Iter __first, _Iter __middle, _Sent __last, _Comp&& __comp, _Proj&& __proj) {
45     auto __last_iter = ranges::next(__middle, __last);
46     std::__inplace_merge<_RangeAlgPolicy>(
47         std::move(__first), std::move(__middle), __last_iter, std::__make_projected(__comp, __proj));
48     return __last_iter;
49   }
50 
51   template <bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent, class _Comp = ranges::less, class _Proj = identity>
52     requires sortable<_Iter, _Comp, _Proj>
53   _LIBCPP_HIDE_FROM_ABI _Iter
54   operator()(_Iter __first, _Iter __middle, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const {
55     return __inplace_merge_impl(
56         std::move(__first), std::move(__middle), std::move(__last), std::move(__comp), std::move(__proj));
57   }
58 
59   template <bidirectional_range _Range, class _Comp = ranges::less, class _Proj = identity>
60     requires sortable<iterator_t<_Range>, _Comp, _Proj>
61   _LIBCPP_HIDE_FROM_ABI borrowed_iterator_t<_Range>
62   operator()(_Range&& __range, iterator_t<_Range> __middle, _Comp __comp = {}, _Proj __proj = {}) const {
63     return __inplace_merge_impl(
64         ranges::begin(__range), std::move(__middle), ranges::end(__range), std::move(__comp), std::move(__proj));
65   }
66 };
67 
68 } // namespace __inplace_merge
69 
70 inline namespace __cpo {
71 inline constexpr auto inplace_merge = __inplace_merge::__fn{};
72 } // namespace __cpo
73 } // namespace ranges
74 
75 _LIBCPP_END_NAMESPACE_STD
76 
77 #endif // _LIBCPP_STD_VER >= 20
78 
79 #endif // _LIBCPP___ALGORITHM_RANGES_INPLACE_MERGE_H
80