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_PARTITION_COPY_H 10 #define _LIBCPP___ALGORITHM_RANGES_PARTITION_COPY_H 11 12 #include <__algorithm/in_out_out_result.h> 13 #include <__config> 14 #include <__functional/identity.h> 15 #include <__functional/invoke.h> 16 #include <__iterator/concepts.h> 17 #include <__iterator/iterator_traits.h> 18 #include <__iterator/projected.h> 19 #include <__ranges/access.h> 20 #include <__ranges/concepts.h> 21 #include <__ranges/dangling.h> 22 #include <__type_traits/remove_cvref.h> 23 #include <__utility/move.h> 24 25 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 26 # pragma GCC system_header 27 #endif 28 29 #if _LIBCPP_STD_VER >= 20 30 31 _LIBCPP_BEGIN_NAMESPACE_STD 32 33 namespace ranges { 34 35 template <class _InIter, class _OutIter1, class _OutIter2> 36 using partition_copy_result = in_out_out_result<_InIter, _OutIter1, _OutIter2>; 37 38 namespace __partition_copy { 39 40 struct __fn { 41 // TODO(ranges): delegate to the classic algorithm. 42 template <class _InIter, class _Sent, class _OutIter1, class _OutIter2, class _Proj, class _Pred> 43 _LIBCPP_HIDE_FROM_ABI constexpr static partition_copy_result<__remove_cvref_t<_InIter>, 44 __remove_cvref_t<_OutIter1>, 45 __remove_cvref_t<_OutIter2> > 46 __partition_copy_fn_impl( 47 _InIter&& __first, 48 _Sent&& __last, 49 _OutIter1&& __out_true, 50 _OutIter2&& __out_false, 51 _Pred& __pred, 52 _Proj& __proj) { 53 for (; __first != __last; ++__first) { 54 if (std::invoke(__pred, std::invoke(__proj, *__first))) { 55 *__out_true = *__first; 56 ++__out_true; 57 58 } else { 59 *__out_false = *__first; 60 ++__out_false; 61 } 62 } 63 64 return {std::move(__first), std::move(__out_true), std::move(__out_false)}; 65 } 66 67 template <input_iterator _InIter, 68 sentinel_for<_InIter> _Sent, 69 weakly_incrementable _OutIter1, 70 weakly_incrementable _OutIter2, 71 class _Proj = identity, 72 indirect_unary_predicate<projected<_InIter, _Proj>> _Pred> 73 requires indirectly_copyable<_InIter, _OutIter1> && indirectly_copyable<_InIter, _OutIter2> 74 _LIBCPP_HIDE_FROM_ABI constexpr partition_copy_result<_InIter, _OutIter1, _OutIter2> operator()( 75 _InIter __first, _Sent __last, _OutIter1 __out_true, _OutIter2 __out_false, _Pred __pred, _Proj __proj = {}) 76 const { 77 return __partition_copy_fn_impl( 78 std::move(__first), std::move(__last), std::move(__out_true), std::move(__out_false), __pred, __proj); 79 } 80 81 template <input_range _Range, 82 weakly_incrementable _OutIter1, 83 weakly_incrementable _OutIter2, 84 class _Proj = identity, 85 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> 86 requires indirectly_copyable<iterator_t<_Range>, _OutIter1> && indirectly_copyable<iterator_t<_Range>, _OutIter2> 87 _LIBCPP_HIDE_FROM_ABI constexpr partition_copy_result<borrowed_iterator_t<_Range>, _OutIter1, _OutIter2> 88 operator()(_Range&& __range, _OutIter1 __out_true, _OutIter2 __out_false, _Pred __pred, _Proj __proj = {}) const { 89 return __partition_copy_fn_impl( 90 ranges::begin(__range), ranges::end(__range), std::move(__out_true), std::move(__out_false), __pred, __proj); 91 } 92 }; 93 94 } // namespace __partition_copy 95 96 inline namespace __cpo { 97 inline constexpr auto partition_copy = __partition_copy::__fn{}; 98 } // namespace __cpo 99 } // namespace ranges 100 101 _LIBCPP_END_NAMESPACE_STD 102 103 #endif // _LIBCPP_STD_VER >= 20 104 105 #endif // _LIBCPP___ALGORITHM_RANGES_PARTITION_COPY_H 106