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_MAX_ELEMENT_H
10#define _LIBCPP___ALGORITHM_RANGES_MAX_ELEMENT_H
11
12#include <__algorithm/min_element.h>
13#include <__config>
14#include <__functional/identity.h>
15#include <__functional/invoke.h>
16#include <__functional/ranges_operations.h>
17#include <__iterator/concepts.h>
18#include <__iterator/projected.h>
19#include <__ranges/access.h>
20#include <__ranges/concepts.h>
21#include <__ranges/dangling.h>
22
23#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
24#  pragma GCC system_header
25#endif
26
27_LIBCPP_PUSH_MACROS
28#include <__undef_macros>
29
30#if _LIBCPP_STD_VER >= 20
31
32_LIBCPP_BEGIN_NAMESPACE_STD
33
34namespace ranges {
35struct __max_element {
36  template <forward_iterator _Ip,
37            sentinel_for<_Ip> _Sp,
38            class _Proj                                             = identity,
39            indirect_strict_weak_order<projected<_Ip, _Proj>> _Comp = ranges::less>
40  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Ip
41  operator()(_Ip __first, _Sp __last, _Comp __comp = {}, _Proj __proj = {}) const {
42    auto __comp_lhs_rhs_swapped = [&](auto&& __lhs, auto&& __rhs) -> bool { return std::invoke(__comp, __rhs, __lhs); };
43    return std::__min_element(__first, __last, __comp_lhs_rhs_swapped, __proj);
44  }
45
46  template <forward_range _Rp,
47            class _Proj                                                         = identity,
48            indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less>
49  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Rp>
50  operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
51    auto __comp_lhs_rhs_swapped = [&](auto&& __lhs, auto&& __rhs) -> bool { return std::invoke(__comp, __rhs, __lhs); };
52    return std::__min_element(ranges::begin(__r), ranges::end(__r), __comp_lhs_rhs_swapped, __proj);
53  }
54};
55
56inline namespace __cpo {
57inline constexpr auto max_element = __max_element{};
58} // namespace __cpo
59} // namespace ranges
60
61_LIBCPP_END_NAMESPACE_STD
62
63#endif // _LIBCPP_STD_VER >= 20
64
65_LIBCPP_POP_MACROS
66
67#endif // _LIBCPP___ALGORITHM_RANGES_MAX_ELEMENT_H