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_EQUAL_RANGE_H 10fe6060f1SDimitry Andric #define _LIBCPP___ALGORITHM_EQUAL_RANGE_H 11fe6060f1SDimitry Andric 12fe6060f1SDimitry Andric #include <__algorithm/comp.h> 13fe6060f1SDimitry Andric #include <__algorithm/comp_ref_type.h> 14fe6060f1SDimitry Andric #include <__algorithm/half_positive.h> 1581ad6265SDimitry Andric #include <__algorithm/iterator_operations.h> 16fe6060f1SDimitry Andric #include <__algorithm/lower_bound.h> 17fe6060f1SDimitry Andric #include <__algorithm/upper_bound.h> 1804eeddc0SDimitry Andric #include <__config> 1981ad6265SDimitry Andric #include <__functional/identity.h> 20fcaf7f86SDimitry Andric #include <__functional/invoke.h> 2181ad6265SDimitry Andric #include <__iterator/advance.h> 2281ad6265SDimitry Andric #include <__iterator/distance.h> 2381ad6265SDimitry Andric #include <__iterator/iterator_traits.h> 24972a253aSDimitry Andric #include <__iterator/next.h> 25fcaf7f86SDimitry Andric #include <__type_traits/is_callable.h> 26*0fca6ea1SDimitry Andric #include <__type_traits/is_constructible.h> 27fcaf7f86SDimitry Andric #include <__utility/move.h> 2881ad6265SDimitry Andric #include <__utility/pair.h> 29fe6060f1SDimitry Andric 30fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 31fe6060f1SDimitry Andric # pragma GCC system_header 32fe6060f1SDimitry Andric #endif 33fe6060f1SDimitry Andric 34b3edf446SDimitry Andric _LIBCPP_PUSH_MACROS 35b3edf446SDimitry Andric #include <__undef_macros> 36b3edf446SDimitry Andric 37fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 38fe6060f1SDimitry Andric 39fcaf7f86SDimitry Andric template <class _AlgPolicy, class _Compare, class _Iter, class _Sent, class _Tp, class _Proj> 40bdd1243dSDimitry Andric _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_Iter, _Iter> 41fcaf7f86SDimitry Andric __equal_range(_Iter __first, _Sent __last, const _Tp& __value, _Compare&& __comp, _Proj&& __proj) { 42fcaf7f86SDimitry Andric auto __len = _IterOps<_AlgPolicy>::distance(__first, __last); 43fcaf7f86SDimitry Andric _Iter __end = _IterOps<_AlgPolicy>::next(__first, __last); 44fcaf7f86SDimitry Andric while (__len != 0) { 45fcaf7f86SDimitry Andric auto __half_len = std::__half_positive(__len); 46fcaf7f86SDimitry Andric _Iter __mid = _IterOps<_AlgPolicy>::next(__first, __half_len); 47fcaf7f86SDimitry Andric if (std::__invoke(__comp, std::__invoke(__proj, *__mid), __value)) { 48fcaf7f86SDimitry Andric __first = ++__mid; 49fcaf7f86SDimitry Andric __len -= __half_len + 1; 50fcaf7f86SDimitry Andric } else if (std::__invoke(__comp, __value, std::__invoke(__proj, *__mid))) { 51fcaf7f86SDimitry Andric __end = __mid; 52fcaf7f86SDimitry Andric __len = __half_len; 53fcaf7f86SDimitry Andric } else { 54fcaf7f86SDimitry Andric _Iter __mp1 = __mid; 55cb14a3feSDimitry Andric return pair<_Iter, _Iter>(std::__lower_bound<_AlgPolicy>(__first, __mid, __value, __comp, __proj), 56fcaf7f86SDimitry Andric std::__upper_bound<_AlgPolicy>(++__mp1, __end, __value, __comp, __proj)); 57fe6060f1SDimitry Andric } 58fe6060f1SDimitry Andric } 59fcaf7f86SDimitry Andric return pair<_Iter, _Iter>(__first, __first); 60fe6060f1SDimitry Andric } 61fe6060f1SDimitry Andric 62fe6060f1SDimitry Andric template <class _ForwardIterator, class _Tp, class _Compare> 63*0fca6ea1SDimitry Andric _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_ForwardIterator, _ForwardIterator> 64fcaf7f86SDimitry Andric equal_range(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp) { 65cb14a3feSDimitry Andric static_assert(__is_callable<_Compare, decltype(*__first), const _Tp&>::value, "The comparator has to be callable"); 66cb14a3feSDimitry Andric static_assert(is_copy_constructible<_ForwardIterator>::value, "Iterator has to be copy constructible"); 67fcaf7f86SDimitry Andric return std::__equal_range<_ClassicAlgPolicy>( 68bdd1243dSDimitry Andric std::move(__first), 69bdd1243dSDimitry Andric std::move(__last), 70bdd1243dSDimitry Andric __value, 71bdd1243dSDimitry Andric static_cast<__comp_ref_type<_Compare> >(__comp), 72bdd1243dSDimitry Andric std::__identity()); 73fe6060f1SDimitry Andric } 74fe6060f1SDimitry Andric 75fe6060f1SDimitry Andric template <class _ForwardIterator, class _Tp> 76*0fca6ea1SDimitry Andric _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_ForwardIterator, _ForwardIterator> 77fcaf7f86SDimitry Andric equal_range(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) { 7806c3fb27SDimitry Andric return std::equal_range(std::move(__first), std::move(__last), __value, __less<>()); 79fe6060f1SDimitry Andric } 80fe6060f1SDimitry Andric 81fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 82fe6060f1SDimitry Andric 83b3edf446SDimitry Andric _LIBCPP_POP_MACROS 84b3edf446SDimitry Andric 85fe6060f1SDimitry Andric #endif // _LIBCPP___ALGORITHM_EQUAL_RANGE_H 86