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 > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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 <
52         bidirectional_iterator _Iter,
53         sentinel_for<_Iter> _Sent,
54         class _Comp = ranges::less,
55         class _Proj = identity>
56       requires sortable<_Iter, _Comp, _Proj>
57     _LIBCPP_HIDE_FROM_ABI _Iter
58     operator()(_Iter __first, _Iter __middle, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const {
59       return __inplace_merge_impl(
60           std::move(__first), std::move(__middle), std::move(__last), std::move(__comp), std::move(__proj));
61     }
62 
63     template <bidirectional_range _Range, class _Comp = ranges::less, class _Proj = identity>
64       requires sortable<
65           iterator_t<_Range>,
66           _Comp,
67           _Proj> _LIBCPP_HIDE_FROM_ABI borrowed_iterator_t<_Range>
68       operator()(_Range&& __range, iterator_t<_Range> __middle, _Comp __comp = {}, _Proj __proj = {}) const {
69       return __inplace_merge_impl(
70           ranges::begin(__range), std::move(__middle), ranges::end(__range), std::move(__comp), std::move(__proj));
71     }
72   };
73 
74 } // namespace __inplace_merge
75 
76 inline namespace __cpo {
77   inline constexpr auto inplace_merge = __inplace_merge::__fn{};
78 } // namespace __cpo
79 } // namespace ranges
80 
81 _LIBCPP_END_NAMESPACE_STD
82 
83 #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
84 
85 #endif // _LIBCPP___ALGORITHM_RANGES_INPLACE_MERGE_H
86