xref: /freebsd-src/contrib/llvm-project/libcxx/include/__algorithm/upper_bound.h (revision 0fca6ea1d4eea4c934cfff25ac9ee8ad6fe95583)
1fe6060f1SDimitry Andric //===----------------------------------------------------------------------===//
2fe6060f1SDimitry Andric //
3fe6060f1SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4fe6060f1SDimitry Andric // See https://llvm.org/LICENSE.txt for license information.
5fe6060f1SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6fe6060f1SDimitry Andric //
7fe6060f1SDimitry Andric //===----------------------------------------------------------------------===//
8fe6060f1SDimitry Andric 
9fe6060f1SDimitry Andric #ifndef _LIBCPP___ALGORITHM_UPPER_BOUND_H
10fe6060f1SDimitry Andric #define _LIBCPP___ALGORITHM_UPPER_BOUND_H
11fe6060f1SDimitry Andric 
12fe6060f1SDimitry Andric #include <__algorithm/comp.h>
13fe6060f1SDimitry Andric #include <__algorithm/half_positive.h>
14fcaf7f86SDimitry Andric #include <__algorithm/iterator_operations.h>
1504eeddc0SDimitry Andric #include <__config>
16fcaf7f86SDimitry Andric #include <__functional/identity.h>
17fcaf7f86SDimitry Andric #include <__functional/invoke.h>
1881ad6265SDimitry Andric #include <__iterator/advance.h>
1981ad6265SDimitry Andric #include <__iterator/distance.h>
2081ad6265SDimitry Andric #include <__iterator/iterator_traits.h>
21*0fca6ea1SDimitry Andric #include <__type_traits/is_constructible.h>
22fcaf7f86SDimitry Andric #include <__utility/move.h>
23fe6060f1SDimitry Andric 
24fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
25fe6060f1SDimitry Andric #  pragma GCC system_header
26fe6060f1SDimitry Andric #endif
27fe6060f1SDimitry Andric 
2806c3fb27SDimitry Andric _LIBCPP_PUSH_MACROS
2906c3fb27SDimitry Andric #include <__undef_macros>
3006c3fb27SDimitry Andric 
31fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD
32fe6060f1SDimitry Andric 
33fcaf7f86SDimitry Andric template <class _AlgPolicy, class _Compare, class _Iter, class _Sent, class _Tp, class _Proj>
34bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Iter
35fcaf7f86SDimitry Andric __upper_bound(_Iter __first, _Sent __last, const _Tp& __value, _Compare&& __comp, _Proj&& __proj) {
36fcaf7f86SDimitry Andric   auto __len = _IterOps<_AlgPolicy>::distance(__first, __last);
37fcaf7f86SDimitry Andric   while (__len != 0) {
38fcaf7f86SDimitry Andric     auto __half_len = std::__half_positive(__len);
39fcaf7f86SDimitry Andric     auto __mid      = _IterOps<_AlgPolicy>::next(__first, __half_len);
40fcaf7f86SDimitry Andric     if (std::__invoke(__comp, __value, std::__invoke(__proj, *__mid)))
41fcaf7f86SDimitry Andric       __len = __half_len;
42fcaf7f86SDimitry Andric     else {
43fcaf7f86SDimitry Andric       __first = ++__mid;
44fcaf7f86SDimitry Andric       __len -= __half_len + 1;
45fe6060f1SDimitry Andric     }
46fe6060f1SDimitry Andric   }
47fe6060f1SDimitry Andric   return __first;
48fe6060f1SDimitry Andric }
49fe6060f1SDimitry Andric 
50fe6060f1SDimitry Andric template <class _ForwardIterator, class _Tp, class _Compare>
51*0fca6ea1SDimitry Andric _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
52fcaf7f86SDimitry Andric upper_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp) {
5306c3fb27SDimitry Andric   static_assert(is_copy_constructible<_ForwardIterator>::value, "Iterator has to be copy constructible");
54fcaf7f86SDimitry Andric   return std::__upper_bound<_ClassicAlgPolicy>(
55fcaf7f86SDimitry Andric       std::move(__first), std::move(__last), __value, std::move(__comp), std::__identity());
56fe6060f1SDimitry Andric }
57fe6060f1SDimitry Andric 
58fe6060f1SDimitry Andric template <class _ForwardIterator, class _Tp>
59*0fca6ea1SDimitry Andric _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
60fcaf7f86SDimitry Andric upper_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) {
6106c3fb27SDimitry Andric   return std::upper_bound(std::move(__first), std::move(__last), __value, __less<>());
62fe6060f1SDimitry Andric }
63fe6060f1SDimitry Andric 
64fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD
65fe6060f1SDimitry Andric 
6606c3fb27SDimitry Andric _LIBCPP_POP_MACROS
6706c3fb27SDimitry Andric 
68fe6060f1SDimitry Andric #endif // _LIBCPP___ALGORITHM_UPPER_BOUND_H
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