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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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___ALGORITHM_RANGES_IS_PARTITIONED_H10#define _LIBCPP___ALGORITHM_RANGES_IS_PARTITIONED_H11 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_header24#endif25 26_LIBCPP_PUSH_MACROS27#include <__undef_macros>28 29#if _LIBCPP_STD_VER >= 2030 31_LIBCPP_BEGIN_NAMESPACE_STD32 33namespace ranges {34struct __is_partitioned {35 template <class _Iter, class _Sent, class _Proj, class _Pred>36 _LIBCPP_HIDE_FROM_ABI constexpr static bool37 __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 bool60 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 bool68 operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const {69 return __is_partitioned_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj);70 }71};72 73inline namespace __cpo {74inline constexpr auto is_partitioned = __is_partitioned{};75} // namespace __cpo76} // namespace ranges77 78_LIBCPP_END_NAMESPACE_STD79 80#endif // _LIBCPP_STD_VER >= 2081 82_LIBCPP_POP_MACROS83 84#endif // _LIBCPP___ALGORITHM_RANGES_IS_PARTITIONED_H85