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| 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_PARTITION_POINT_H |
| 10 | #define _LIBCPP___ALGORITHM_RANGES_PARTITION_POINT_H |
| 11 | |
| 12 | #include <__algorithm/half_positive.h> |
| 13 | #include <__config> |
| 14 | #include <__functional/identity.h> |
| 15 | #include <__functional/invoke.h> |
| 16 | #include <__iterator/concepts.h> |
| 17 | #include <__iterator/distance.h> |
| 18 | #include <__iterator/iterator_traits.h> |
| 19 | #include <__iterator/next.h> |
| 20 | #include <__iterator/projected.h> |
| 21 | #include <__ranges/access.h> |
| 22 | #include <__ranges/concepts.h> |
| 23 | #include <__ranges/dangling.h> |
| 24 | #include <__utility/move.h> |
| 25 | |
| 26 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 27 | # pragma GCC system_header |
| 28 | #endif |
| 29 | |
| 30 | _LIBCPP_PUSH_MACROS |
| 31 | #include <__undef_macros> |
| 32 | |
| 33 | #if _LIBCPP_STD_VER >= 20 |
| 34 | |
| 35 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 36 | |
| 37 | namespace ranges { |
| 38 | struct __partition_point { |
| 39 | // TODO(ranges): delegate to the classic algorithm. |
| 40 | template <class _Iter, class _Sent, class _Proj, class _Pred> |
| 41 | _LIBCPP_HIDE_FROM_ABI constexpr static _Iter |
| 42 | __partition_point_fn_impl(_Iter&& __first, _Sent&& __last, _Pred& __pred, _Proj& __proj) { |
| 43 | auto __len = ranges::distance(__first, __last); |
| 44 | |
| 45 | while (__len != 0) { |
| 46 | auto __half_len = std::__half_positive(__len); |
| 47 | auto __mid = ranges::next(__first, __half_len); |
| 48 | |
| 49 | if (std::invoke(__pred, std::invoke(__proj, *__mid))) { |
| 50 | __first = ++__mid; |
| 51 | __len -= __half_len + 1; |
| 52 | |
| 53 | } else { |
| 54 | __len = __half_len; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | return __first; |
| 59 | } |
| 60 | |
| 61 | template <forward_iterator _Iter, |
| 62 | sentinel_for<_Iter> _Sent, |
| 63 | class _Proj = identity, |
| 64 | indirect_unary_predicate<projected<_Iter, _Proj>> _Pred> |
| 65 | _LIBCPP_HIDE_FROM_ABI constexpr _Iter operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const { |
| 66 | return __partition_point_fn_impl(std::move(__first), std::move(__last), __pred, __proj); |
| 67 | } |
| 68 | |
| 69 | template <forward_range _Range, |
| 70 | class _Proj = identity, |
| 71 | indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> |
| 72 | _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range> |
| 73 | operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const { |
| 74 | return __partition_point_fn_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj); |
| 75 | } |
| 76 | }; |
| 77 | |
| 78 | inline namespace __cpo { |
| 79 | inline constexpr auto partition_point = __partition_point{}; |
| 80 | } // namespace __cpo |
| 81 | } // namespace ranges |
| 82 | |
| 83 | _LIBCPP_END_NAMESPACE_STD |
| 84 | |
| 85 | #endif // _LIBCPP_STD_VER >= 20 |
| 86 | |
| 87 | _LIBCPP_POP_MACROS |
| 88 | |
| 89 | #endif // _LIBCPP___ALGORITHM_RANGES_PARTITION_POINT_H |
| 90 |
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