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_EQUAL_RANGE_H
10 #define _LIBCPP___ALGORITHM_RANGES_EQUAL_RANGE_H
11 
12 #include <__algorithm/equal_range.h>
13 #include <__algorithm/iterator_operations.h>
14 #include <__config>
15 #include <__functional/identity.h>
16 #include <__functional/invoke.h>
17 #include <__functional/ranges_operations.h>
18 #include <__iterator/concepts.h>
19 #include <__iterator/iterator_traits.h>
20 #include <__iterator/projected.h>
21 #include <__ranges/access.h>
22 #include <__ranges/concepts.h>
23 #include <__ranges/dangling.h>
24 #include <__ranges/subrange.h>
25 #include <__utility/forward.h>
26 #include <__utility/move.h>
27 #include <__utility/pair.h>
28 
29 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
30 #  pragma GCC system_header
31 #endif
32 
33 #if _LIBCPP_STD_VER >= 20
34 
35 _LIBCPP_BEGIN_NAMESPACE_STD
36 
37 namespace ranges {
38 namespace __equal_range {
39 
40 struct __fn {
41   template <forward_iterator _Iter,
42             sentinel_for<_Iter> _Sent,
43             class _Tp,
44             class _Proj                                                           = identity,
45             indirect_strict_weak_order<const _Tp*, projected<_Iter, _Proj>> _Comp = ranges::less>
46   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter>
47   operator()(_Iter __first, _Sent __last, const _Tp& __value, _Comp __comp = {}, _Proj __proj = {}) const {
48     auto __ret = std::__equal_range<_RangeAlgPolicy>(std::move(__first), std::move(__last), __value, __comp, __proj);
49     return {std::move(__ret.first), std::move(__ret.second)};
50   }
51 
52   template <forward_range _Range,
53             class _Tp,
54             class _Proj                                                                        = identity,
55             indirect_strict_weak_order<const _Tp*, projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less>
56   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range>
57   operator()(_Range&& __range, const _Tp& __value, _Comp __comp = {}, _Proj __proj = {}) const {
58     auto __ret =
59         std::__equal_range<_RangeAlgPolicy>(ranges::begin(__range), ranges::end(__range), __value, __comp, __proj);
60     return {std::move(__ret.first), std::move(__ret.second)};
61   }
62 };
63 
64 } // namespace __equal_range
65 
66 inline namespace __cpo {
67 inline constexpr auto equal_range = __equal_range::__fn{};
68 } // namespace __cpo
69 } // namespace ranges
70 
71 _LIBCPP_END_NAMESPACE_STD
72 
73 #endif // _LIBCPP_STD_VER >= 20
74 
75 #endif // _LIBCPP___ALGORITHM_RANGES_EQUAL_RANGE_H
76