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_BINARY_SEARCH_H
10#define _LIBCPP___ALGORITHM_RANGES_BINARY_SEARCH_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
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 __binary_search {
36  template <forward_iterator _Iter,
37            sentinel_for<_Iter> _Sent,
38            class _Type,
39            class _Proj                                                             = identity,
40            indirect_strict_weak_order<const _Type*, projected<_Iter, _Proj>> _Comp = ranges::less>
41  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool
42  operator()(_Iter __first, _Sent __last, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const {
43    auto __ret = std::__lower_bound<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj);
44    return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret));
45  }
46
47  template <forward_range _Range,
48            class _Type,
49            class _Proj                                                                          = identity,
50            indirect_strict_weak_order<const _Type*, projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less>
51  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool
52  operator()(_Range&& __r, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const {
53    auto __first = ranges::begin(__r);
54    auto __last  = ranges::end(__r);
55    auto __ret   = std::__lower_bound<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj);
56    return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret));
57  }
58};
59
60inline namespace __cpo {
61inline constexpr auto binary_search = __binary_search{};
62} // namespace __cpo
63} // namespace ranges
64
65_LIBCPP_END_NAMESPACE_STD
66
67#endif // _LIBCPP_STD_VER >= 20
68
69_LIBCPP_POP_MACROS
70
71#endif // _LIBCPP___ALGORITHM_RANGES_BINARY_SEARCH_H