diff options
Diffstat (limited to 'contrib/llvm-project/libcxx/include/__algorithm/equal_range.h')
| -rw-r--r-- | contrib/llvm-project/libcxx/include/__algorithm/equal_range.h | 87 |
1 files changed, 41 insertions, 46 deletions
diff --git a/contrib/llvm-project/libcxx/include/__algorithm/equal_range.h b/contrib/llvm-project/libcxx/include/__algorithm/equal_range.h index f30f55be64fc..42d009ebbc0f 100644 --- a/contrib/llvm-project/libcxx/include/__algorithm/equal_range.h +++ b/contrib/llvm-project/libcxx/include/__algorithm/equal_range.h @@ -17,9 +17,13 @@ #include <__algorithm/upper_bound.h> #include <__config> #include <__functional/identity.h> +#include <__functional/invoke.h> #include <__iterator/advance.h> #include <__iterator/distance.h> #include <__iterator/iterator_traits.h> +#include <__type_traits/is_callable.h> +#include <__type_traits/is_copy_constructible.h> +#include <__utility/move.h> #include <__utility/pair.h> #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) @@ -28,59 +32,50 @@ _LIBCPP_BEGIN_NAMESPACE_STD -template <class _Compare, class _ForwardIterator, class _Tp> -_LIBCPP_CONSTEXPR_AFTER_CXX17 pair<_ForwardIterator, _ForwardIterator> -__equal_range(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp) -{ - typedef typename iterator_traits<_ForwardIterator>::difference_type difference_type; - difference_type __len = _VSTD::distance(__first, __last); - while (__len != 0) - { - difference_type __l2 = _VSTD::__half_positive(__len); - _ForwardIterator __m = __first; - _VSTD::advance(__m, __l2); - if (__comp(*__m, __value)) - { - __first = ++__m; - __len -= __l2 + 1; - } - else if (__comp(__value, *__m)) - { - __last = __m; - __len = __l2; - } - else - { - auto __proj = std::__identity(); - _ForwardIterator __mp1 = __m; - return pair<_ForwardIterator, _ForwardIterator> - ( - _VSTD::__lower_bound_impl<_ClassicAlgPolicy>(__first, __m, __value, __comp, __proj), - _VSTD::__upper_bound<_Compare>(++__mp1, __last, __value, __comp) - ); - } +template <class _AlgPolicy, class _Compare, class _Iter, class _Sent, class _Tp, class _Proj> +_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 pair<_Iter, _Iter> +__equal_range(_Iter __first, _Sent __last, const _Tp& __value, _Compare&& __comp, _Proj&& __proj) { + auto __len = _IterOps<_AlgPolicy>::distance(__first, __last); + _Iter __end = _IterOps<_AlgPolicy>::next(__first, __last); + while (__len != 0) { + auto __half_len = std::__half_positive(__len); + _Iter __mid = _IterOps<_AlgPolicy>::next(__first, __half_len); + if (std::__invoke(__comp, std::__invoke(__proj, *__mid), __value)) { + __first = ++__mid; + __len -= __half_len + 1; + } else if (std::__invoke(__comp, __value, std::__invoke(__proj, *__mid))) { + __end = __mid; + __len = __half_len; + } else { + _Iter __mp1 = __mid; + return pair<_Iter, _Iter>( + std::__lower_bound_impl<_AlgPolicy>(__first, __mid, __value, __comp, __proj), + std::__upper_bound<_AlgPolicy>(++__mp1, __end, __value, __comp, __proj)); } - return pair<_ForwardIterator, _ForwardIterator>(__first, __first); + } + return pair<_Iter, _Iter>(__first, __first); } template <class _ForwardIterator, class _Tp, class _Compare> -_LIBCPP_NODISCARD_EXT inline -_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 -pair<_ForwardIterator, _ForwardIterator> -equal_range(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp) -{ - typedef typename __comp_ref_type<_Compare>::type _Comp_ref; - return _VSTD::__equal_range<_Comp_ref>(__first, __last, __value, __comp); +_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 pair<_ForwardIterator, _ForwardIterator> +equal_range(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp) { + static_assert(__is_callable<_Compare, decltype(*__first), const _Tp&>::value, + "The comparator has to be callable"); + static_assert(is_copy_constructible<_ForwardIterator>::value, + "Iterator has to be copy constructible"); + typedef typename __comp_ref_type<_Compare>::type _Comp_ref; + return std::__equal_range<_ClassicAlgPolicy>( + std::move(__first), std::move(__last), __value, static_cast<_Comp_ref>(__comp), std::__identity()); } template <class _ForwardIterator, class _Tp> -_LIBCPP_NODISCARD_EXT inline -_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 -pair<_ForwardIterator, _ForwardIterator> -equal_range(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) -{ - return _VSTD::equal_range(__first, __last, __value, - __less<typename iterator_traits<_ForwardIterator>::value_type, _Tp>()); +_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 pair<_ForwardIterator, _ForwardIterator> +equal_range(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) { + return std::equal_range( + std::move(__first), + std::move(__last), + __value, + __less<typename iterator_traits<_ForwardIterator>::value_type, _Tp>()); } _LIBCPP_END_NAMESPACE_STD |