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/lower_bound.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 
22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
23 #  pragma GCC system_header
24 #endif
25 
26 #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
27 
28 _LIBCPP_BEGIN_NAMESPACE_STD
29 
30 namespace ranges {
31 namespace __binary_search {
32 struct __fn {
33   template <forward_iterator _Iter, sentinel_for<_Iter> _Sent, class _Type, class _Proj = identity,
34             indirect_strict_weak_order<const _Type*, projected<_Iter, _Proj>> _Comp = ranges::less>
35   _LIBCPP_HIDE_FROM_ABI constexpr
36   bool operator()(_Iter __first, _Sent __last, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const {
37     auto __ret = std::__lower_bound_impl(__first, __last, __value, __comp, __proj);
38     return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__first));
39   }
40 
41   template <forward_range _Range, class _Type, class _Proj = identity,
42             indirect_strict_weak_order<const _Type*, projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less>
43   _LIBCPP_HIDE_FROM_ABI constexpr
44   bool operator()(_Range&& __r, const _Type& __value, _Comp __comp = {}, _Proj __proj = {}) const {
45     auto __first = ranges::begin(__r);
46     auto __last = ranges::end(__r);
47     auto __ret = std::__lower_bound_impl(__first, __last, __value, __comp, __proj);
48     return __ret != __last && !std::invoke(__comp, __value, std::invoke(__proj, *__first));
49   }
50 };
51 } // namespace __binary_search
52 
53 inline namespace __cpo {
54   inline constexpr auto binary_search = __binary_search::__fn{};
55 } // namespace __cpo
56 } // namespace ranges
57 
58 _LIBCPP_END_NAMESPACE_STD
59 
60 #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
61 
62 #endif // _LIBCPP___ALGORITHM_RANGES_BINARY_SEARCH_H
63