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#if _LIBCPP_STD_VER > 17
28
29_LIBCPP_BEGIN_NAMESPACE_STD
30
31namespace ranges {
32namespace __binary_search {
33struct __fn {
34  template <forward_iterator _Iter, sentinel_for<_Iter> _Sent, class _Type, class _Proj = identity,
35            indirect_strict_weak_order<const _Type*, projected<_Iter, _Proj>> _Comp = ranges::less>
36  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
37  bool operator()(_Iter __first, _Sent __last, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const {
38    auto __ret = std::__lower_bound_impl<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj);
39    return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret));
40  }
41
42  template <forward_range _Range, class _Type, class _Proj = identity,
43            indirect_strict_weak_order<const _Type*, projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less>
44  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
45  bool operator()(_Range&& __r, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const {
46    auto __first = ranges::begin(__r);
47    auto __last = ranges::end(__r);
48    auto __ret = std::__lower_bound_impl<_RangeAlgPolicy>(__first, __last, __value, __comp, __proj);
49    return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__ret));
50  }
51};
52} // namespace __binary_search
53
54inline namespace __cpo {
55  inline constexpr auto binary_search = __binary_search::__fn{};
56} // namespace __cpo
57} // namespace ranges
58
59_LIBCPP_END_NAMESPACE_STD
60
61#endif // _LIBCPP_STD_VER > 17
62
63#endif // _LIBCPP___ALGORITHM_RANGES_BINARY_SEARCH_H
64