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 namespace __is_partitioned { 35 struct __fn { 36 template <class _Iter, class _Sent, class _Proj, class _Pred> 37 _LIBCPP_HIDE_FROM_ABI constexpr static bool __is_partitioned_impl__fn38 __is_partitioned_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) { 39 for (; __first != __last; ++__first) { 40 if (!std::invoke(__pred, std::invoke(__proj, *__first))) 41 break; 42 } 43 44 if (__first == __last) 45 return true; 46 ++__first; 47 48 for (; __first != __last; ++__first) { 49 if (std::invoke(__pred, std::invoke(__proj, *__first))) 50 return false; 51 } 52 53 return true; 54 } 55 56 template <input_iterator _Iter, 57 sentinel_for<_Iter> _Sent, 58 class _Proj = identity, 59 indirect_unary_predicate<projected<_Iter, _Proj>> _Pred> 60 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator__fn61 operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const { 62 return __is_partitioned_impl(std::move(__first), std::move(__last), __pred, __proj); 63 } 64 65 template <input_range _Range, 66 class _Proj = identity, 67 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> 68 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator__fn69 operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const { 70 return __is_partitioned_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj); 71 } 72 }; 73 } // namespace __is_partitioned 74 75 inline namespace __cpo { 76 inline constexpr auto is_partitioned = __is_partitioned::__fn{}; 77 } // namespace __cpo 78 } // namespace ranges 79 80 _LIBCPP_END_NAMESPACE_STD 81 82 #endif // _LIBCPP_STD_VER >= 20 83 84 _LIBCPP_POP_MACROS 85 86 #endif // _LIBCPP___ALGORITHM_RANGES_IS_PARTITIONED_H 87