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_UPPER_BOUND_H
10 #define _LIBCPP___ALGORITHM_RANGES_UPPER_BOUND_H
11 
12 #include <__algorithm/iterator_operations.h>
13 #include <__algorithm/lower_bound.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/projected.h>
20 #include <__ranges/access.h>
21 #include <__ranges/concepts.h>
22 #include <__ranges/dangling.h>
23 
24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
25 #  pragma GCC system_header
26 #endif
27 
28 #if _LIBCPP_STD_VER >= 20
29 
30 _LIBCPP_BEGIN_NAMESPACE_STD
31 
32 namespace ranges {
33 namespace __upper_bound {
34 struct __fn {
35   template <forward_iterator _Iter,
36             sentinel_for<_Iter> _Sent,
37             class _Type,
38             class _Proj                                                             = identity,
39             indirect_strict_weak_order<const _Type*, projected<_Iter, _Proj>> _Comp = ranges::less>
40   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr _Iter
41   operator()(_Iter __first, _Sent __last, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const {
42     auto __comp_lhs_rhs_swapped = [&](const auto& __lhs, const auto& __rhs) -> bool {
43       return !std::invoke(__comp, __rhs, __lhs);
44     };
45 
46     return std::__lower_bound<_RangeAlgPolicy>(__first, __last, __value, __comp_lhs_rhs_swapped, __proj);
47   }
48 
49   template <forward_range _Range,
50             class _Type,
51             class _Proj                                                                          = identity,
52             indirect_strict_weak_order<const _Type*, projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less>
53   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range>
54   operator()(_Range&& __r, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const {
55     auto __comp_lhs_rhs_swapped = [&](const auto& __lhs, const auto& __rhs) -> bool {
56       return !std::invoke(__comp, __rhs, __lhs);
57     };
58 
59     return std::__lower_bound<_RangeAlgPolicy>(
60         ranges::begin(__r), ranges::end(__r), __value, __comp_lhs_rhs_swapped, __proj);
61   }
62 };
63 } // namespace __upper_bound
64 
65 inline namespace __cpo {
66 inline constexpr auto upper_bound = __upper_bound::__fn{};
67 } // namespace __cpo
68 } // namespace ranges
69 
70 _LIBCPP_END_NAMESPACE_STD
71 
72 #endif // _LIBCPP_STD_VER >= 20
73 
74 #endif // _LIBCPP___ALGORITHM_RANGES_UPPER_BOUND_H
75