1 //===----------------------------------------------------------------------===//
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
7 //===----------------------------------------------------------------------===//
9 #ifndef _LIBCPP___ALGORITHM_RANGES_BINARY_SEARCH_H
10 #define _LIBCPP___ALGORITHM_RANGES_BINARY_SEARCH_H
12 #include <__cxx03/__algorithm/iterator_operations.h>
13 #include <__cxx03/__algorithm/lower_bound.h>
14 #include <__cxx03/__config>
15 #include <__cxx03/__functional/identity.h>
16 #include <__cxx03/__functional/invoke.h>
17 #include <__cxx03/__functional/ranges_operations.h>
18 #include <__cxx03/__iterator/concepts.h>
19 #include <__cxx03/__iterator/projected.h>
20 #include <__cxx03/__ranges/access.h>
21 #include <__cxx03/__ranges/concepts.h>
23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
24 # pragma GCC system_header
28 #include <__cxx03/__undef_macros>
30 #if _LIBCPP_STD_VER >= 20
32 _LIBCPP_BEGIN_NAMESPACE_STD
35 namespace __binary_search
{
37 template <forward_iterator _Iter
,
38 sentinel_for
<_Iter
> _Sent
,
40 class _Proj
= identity
,
41 indirect_strict_weak_order
<const _Type
*, projected
<_Iter
, _Proj
>> _Comp
= ranges::less
>
42 [[nodiscard
]] _LIBCPP_HIDE_FROM_ABI
constexpr bool
43 operator()(_Iter __first
, _Sent __last
, const _Type
& __value
, _Comp __comp
= {}, _Proj __proj
= {}) const {
44 auto __ret
= std::__lower_bound
<_RangeAlgPolicy
>(__first
, __last
, __value
, __comp
, __proj
);
45 return __ret
!= __last
&& !std::invoke(__comp
, __value
, std::invoke(__proj
, *__ret
));
48 template <forward_range _Range
,
50 class _Proj
= identity
,
51 indirect_strict_weak_order
<const _Type
*, projected
<iterator_t
<_Range
>, _Proj
>> _Comp
= ranges::less
>
52 [[nodiscard
]] _LIBCPP_HIDE_FROM_ABI
constexpr bool
53 operator()(_Range
&& __r
, const _Type
& __value
, _Comp __comp
= {}, _Proj __proj
= {}) const {
54 auto __first
= ranges::begin(__r
);
55 auto __last
= ranges::end(__r
);
56 auto __ret
= std::__lower_bound
<_RangeAlgPolicy
>(__first
, __last
, __value
, __comp
, __proj
);
57 return __ret
!= __last
&& !std::invoke(__comp
, __value
, std::invoke(__proj
, *__ret
));
60 } // namespace __binary_search
62 inline namespace __cpo
{
63 inline constexpr auto binary_search
= __binary_search::__fn
{};
67 _LIBCPP_END_NAMESPACE_STD
69 #endif // _LIBCPP_STD_VER >= 20
73 #endif // _LIBCPP___ALGORITHM_RANGES_BINARY_SEARCH_H