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 #if _LIBCPP_STD_VER >= 20 27 28 _LIBCPP_BEGIN_NAMESPACE_STD 29 30 namespace ranges { 31 namespace __is_partitioned { 32 struct __fn { 33 template <class _Iter, class _Sent, class _Proj, class _Pred> 34 _LIBCPP_HIDE_FROM_ABI constexpr static bool 35 __is_partitioned_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) { 36 for (; __first != __last; ++__first) { 37 if (!std::invoke(__pred, std::invoke(__proj, *__first))) 38 break; 39 } 40 41 if (__first == __last) 42 return true; 43 ++__first; 44 45 for (; __first != __last; ++__first) { 46 if (std::invoke(__pred, std::invoke(__proj, *__first))) 47 return false; 48 } 49 50 return true; 51 } 52 53 template <input_iterator _Iter, 54 sentinel_for<_Iter> _Sent, 55 class _Proj = identity, 56 indirect_unary_predicate<projected<_Iter, _Proj>> _Pred> 57 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool 58 operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const { 59 return __is_partitioned_impl(std::move(__first), std::move(__last), __pred, __proj); 60 } 61 62 template <input_range _Range, 63 class _Proj = identity, 64 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> 65 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool 66 operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const { 67 return __is_partitioned_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj); 68 } 69 }; 70 } // namespace __is_partitioned 71 72 inline namespace __cpo { 73 inline constexpr auto is_partitioned = __is_partitioned::__fn{}; 74 } // namespace __cpo 75 } // namespace ranges 76 77 _LIBCPP_END_NAMESPACE_STD 78 79 #endif // _LIBCPP_STD_VER >= 20 80 81 #endif // _LIBCPP___ALGORITHM_RANGES_IS_PARTITIONED_H 82