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 <__utility/move.h> 23 24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 25 # pragma GCC system_header 26 #endif 27 28 #if _LIBCPP_STD_VER >= 20 29 30 _LIBCPP_BEGIN_NAMESPACE_STD 31 32 namespace ranges { 33 34 template <class _InIter, class _OutIter1, class _OutIter2> 35 using partition_copy_result = in_out_out_result<_InIter, _OutIter1, _OutIter2>; 36 37 namespace __partition_copy { 38 39 struct __fn { 40 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 44 static partition_copy_result< 45 __remove_cvref_t<_InIter>, __remove_cvref_t<_OutIter1>, __remove_cvref_t<_OutIter2> 46 > __partition_copy_fn_impl( _InIter&& __first, _Sent&& __last, _OutIter1&& __out_true, _OutIter2&& __out_false, 47 _Pred& __pred, _Proj& __proj) { 48 for (; __first != __last; ++__first) { 49 if (std::invoke(__pred, std::invoke(__proj, *__first))) { 50 *__out_true = *__first; 51 ++__out_true; 52 53 } else { 54 *__out_false = *__first; 55 ++__out_false; 56 } 57 } 58 59 return {std::move(__first), std::move(__out_true), std::move(__out_false)}; 60 } 61 62 template <input_iterator _InIter, sentinel_for<_InIter> _Sent, 63 weakly_incrementable _OutIter1, weakly_incrementable _OutIter2, 64 class _Proj = identity, indirect_unary_predicate<projected<_InIter, _Proj>> _Pred> 65 requires indirectly_copyable<_InIter, _OutIter1> && indirectly_copyable<_InIter, _OutIter2> 66 _LIBCPP_HIDE_FROM_ABI constexpr 67 partition_copy_result<_InIter, _OutIter1, _OutIter2> 68 operator()(_InIter __first, _Sent __last, _OutIter1 __out_true, _OutIter2 __out_false, 69 _Pred __pred, _Proj __proj = {}) const { 70 return __partition_copy_fn_impl( 71 std::move(__first), std::move(__last), std::move(__out_true), std::move(__out_false), __pred, __proj); 72 } 73 74 template <input_range _Range, weakly_incrementable _OutIter1, weakly_incrementable _OutIter2, 75 class _Proj = identity, indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> 76 requires indirectly_copyable<iterator_t<_Range>, _OutIter1> && indirectly_copyable<iterator_t<_Range>, _OutIter2> 77 _LIBCPP_HIDE_FROM_ABI constexpr 78 partition_copy_result<borrowed_iterator_t<_Range>, _OutIter1, _OutIter2> 79 operator()(_Range&& __range, _OutIter1 __out_true, _OutIter2 __out_false, _Pred __pred, _Proj __proj = {}) const { 80 return __partition_copy_fn_impl( 81 ranges::begin(__range), ranges::end(__range), std::move(__out_true), std::move(__out_false), __pred, __proj); 82 } 83 84 }; 85 86 } // namespace __partition_copy 87 88 inline namespace __cpo { 89 inline constexpr auto partition_copy = __partition_copy::__fn{}; 90 } // namespace __cpo 91 } // namespace ranges 92 93 _LIBCPP_END_NAMESPACE_STD 94 95 #endif // _LIBCPP_STD_VER >= 20 96 97 #endif // _LIBCPP___ALGORITHM_RANGES_PARTITION_COPY_H 98