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