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_PARTITION_POINT_H 10fe6060f1SDimitry Andric #define _LIBCPP___ALGORITHM_PARTITION_POINT_H 11fe6060f1SDimitry Andric 12fe6060f1SDimitry Andric #include <__algorithm/half_positive.h> 1304eeddc0SDimitry Andric #include <__config> 1481ad6265SDimitry Andric #include <__iterator/advance.h> 1581ad6265SDimitry Andric #include <__iterator/distance.h> 1681ad6265SDimitry Andric #include <__iterator/iterator_traits.h> 17fe6060f1SDimitry Andric 18fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19fe6060f1SDimitry Andric # pragma GCC system_header 20fe6060f1SDimitry Andric #endif 21fe6060f1SDimitry Andric 22fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 23fe6060f1SDimitry Andric 24fe6060f1SDimitry Andric template <class _ForwardIterator, class _Predicate> 25bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator partition_point(_ForwardIterator __first,_ForwardIterator __last,_Predicate __pred)26*cb14a3feSDimitry Andricpartition_point(_ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) { 27fe6060f1SDimitry Andric typedef typename iterator_traits<_ForwardIterator>::difference_type difference_type; 285f757f3fSDimitry Andric difference_type __len = std::distance(__first, __last); 29*cb14a3feSDimitry Andric while (__len != 0) { 305f757f3fSDimitry Andric difference_type __l2 = std::__half_positive(__len); 31fe6060f1SDimitry Andric _ForwardIterator __m = __first; 325f757f3fSDimitry Andric std::advance(__m, __l2); 33*cb14a3feSDimitry Andric if (__pred(*__m)) { 34fe6060f1SDimitry Andric __first = ++__m; 35fe6060f1SDimitry Andric __len -= __l2 + 1; 36*cb14a3feSDimitry Andric } else 37fe6060f1SDimitry Andric __len = __l2; 38fe6060f1SDimitry Andric } 39fe6060f1SDimitry Andric return __first; 40fe6060f1SDimitry Andric } 41fe6060f1SDimitry Andric 42fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 43fe6060f1SDimitry Andric 44fe6060f1SDimitry Andric #endif // _LIBCPP___ALGORITHM_PARTITION_POINT_H 45