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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_IS_PARTITIONED_H |
| 10 | #define _LIBCPP___ALGORITHM_RANGES_IS_PARTITIONED_H |
| 11 | |
| 12 | #include <__config> |
| 13 | #include <__functional/identity.h> |
| 14 | #include <__functional/invoke.h> |
| 15 | #include <__iterator/concepts.h> |
| 16 | #include <__iterator/indirectly_comparable.h> |
| 17 | #include <__iterator/projected.h> |
| 18 | #include <__ranges/access.h> |
| 19 | #include <__ranges/concepts.h> |
| 20 | #include <__utility/move.h> |
| 21 | |
| 22 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 23 | # pragma GCC system_header |
| 24 | #endif |
| 25 | |
| 26 | _LIBCPP_PUSH_MACROS |
| 27 | #include <__undef_macros> |
| 28 | |
| 29 | #if _LIBCPP_STD_VER >= 20 |
| 30 | |
| 31 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 32 | |
| 33 | namespace ranges { |
| 34 | struct __is_partitioned { |
| 35 | template <class _Iter, class _Sent, class _Proj, class _Pred> |
| 36 | _LIBCPP_HIDE_FROM_ABI constexpr static bool |
| 37 | __is_partitioned_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) { |
| 38 | for (; __first != __last; ++__first) { |
| 39 | if (!std::invoke(__pred, std::invoke(__proj, *__first))) |
| 40 | break; |
| 41 | } |
| 42 | |
| 43 | if (__first == __last) |
| 44 | return true; |
| 45 | ++__first; |
| 46 | |
| 47 | for (; __first != __last; ++__first) { |
| 48 | if (std::invoke(__pred, std::invoke(__proj, *__first))) |
| 49 | return false; |
| 50 | } |
| 51 | |
| 52 | return true; |
| 53 | } |
| 54 | |
| 55 | template <input_iterator _Iter, |
| 56 | sentinel_for<_Iter> _Sent, |
| 57 | class _Proj = identity, |
| 58 | indirect_unary_predicate<projected<_Iter, _Proj>> _Pred> |
| 59 | [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool |
| 60 | operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const { |
| 61 | return __is_partitioned_impl(std::move(__first), std::move(__last), __pred, __proj); |
| 62 | } |
| 63 | |
| 64 | template <input_range _Range, |
| 65 | class _Proj = identity, |
| 66 | indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> |
| 67 | [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool |
| 68 | operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const { |
| 69 | return __is_partitioned_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj); |
| 70 | } |
| 71 | }; |
| 72 | |
| 73 | inline namespace __cpo { |
| 74 | inline constexpr auto is_partitioned = __is_partitioned{}; |
| 75 | } // namespace __cpo |
| 76 | } // namespace ranges |
| 77 | |
| 78 | _LIBCPP_END_NAMESPACE_STD |
| 79 | |
| 80 | #endif // _LIBCPP_STD_VER >= 20 |
| 81 | |
| 82 | _LIBCPP_POP_MACROS |
| 83 | |
| 84 | #endif // _LIBCPP___ALGORITHM_RANGES_IS_PARTITIONED_H |
| 85 |
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