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 #include <type_traits> 24 25 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 26 # pragma GCC system_header 27 #endif 28 29 #if _LIBCPP_STD_VER > 17 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 42 // TODO(ranges): delegate to the classic algorithm. 43 template <class _InIter, class _Sent, class _OutIter1, class _OutIter2, class _Proj, class _Pred> 44 _LIBCPP_HIDE_FROM_ABI constexpr 45 static partition_copy_result< 46 __remove_cvref_t<_InIter>, __remove_cvref_t<_OutIter1>, __remove_cvref_t<_OutIter2> 47 > __partition_copy_fn_impl( _InIter&& __first, _Sent&& __last, _OutIter1&& __out_true, _OutIter2&& __out_false, 48 _Pred& __pred, _Proj& __proj) { 49 for (; __first != __last; ++__first) { 50 if (std::invoke(__pred, std::invoke(__proj, *__first))) { 51 *__out_true = *__first; 52 ++__out_true; 53 54 } else { 55 *__out_false = *__first; 56 ++__out_false; 57 } 58 } 59 60 return {std::move(__first), std::move(__out_true), std::move(__out_false)}; 61 } 62 63 template <input_iterator _InIter, sentinel_for<_InIter> _Sent, 64 weakly_incrementable _OutIter1, weakly_incrementable _OutIter2, 65 class _Proj = identity, indirect_unary_predicate<projected<_InIter, _Proj>> _Pred> 66 requires indirectly_copyable<_InIter, _OutIter1> && indirectly_copyable<_InIter, _OutIter2> 67 _LIBCPP_HIDE_FROM_ABI constexpr 68 partition_copy_result<_InIter, _OutIter1, _OutIter2> 69 operator()(_InIter __first, _Sent __last, _OutIter1 __out_true, _OutIter2 __out_false, 70 _Pred __pred, _Proj __proj = {}) const { 71 return __partition_copy_fn_impl( 72 std::move(__first), std::move(__last), std::move(__out_true), std::move(__out_false), __pred, __proj); 73 } 74 75 template <input_range _Range, weakly_incrementable _OutIter1, weakly_incrementable _OutIter2, 76 class _Proj = identity, indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> 77 requires indirectly_copyable<iterator_t<_Range>, _OutIter1> && indirectly_copyable<iterator_t<_Range>, _OutIter2> 78 _LIBCPP_HIDE_FROM_ABI constexpr 79 partition_copy_result<borrowed_iterator_t<_Range>, _OutIter1, _OutIter2> 80 operator()(_Range&& __range, _OutIter1 __out_true, _OutIter2 __out_false, _Pred __pred, _Proj __proj = {}) const { 81 return __partition_copy_fn_impl( 82 ranges::begin(__range), ranges::end(__range), std::move(__out_true), std::move(__out_false), __pred, __proj); 83 } 84 85 }; 86 87 } // namespace __partition_copy 88 89 inline namespace __cpo { 90 inline constexpr auto partition_copy = __partition_copy::__fn{}; 91 } // namespace __cpo 92 } // namespace ranges 93 94 _LIBCPP_END_NAMESPACE_STD 95 96 #endif // _LIBCPP_STD_VER > 17 97 98 #endif // _LIBCPP___ALGORITHM_RANGES_PARTITION_COPY_H 99