| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___ALGORITHM_RANGES_MERGE_H |
| #define _LIBCPP___ALGORITHM_RANGES_MERGE_H |
| |
| #include <__algorithm/in_in_out_result.h> |
| #include <__algorithm/ranges_copy.h> |
| #include <__config> |
| #include <__functional/identity.h> |
| #include <__functional/invoke.h> |
| #include <__functional/ranges_operations.h> |
| #include <__iterator/concepts.h> |
| #include <__iterator/mergeable.h> |
| #include <__ranges/access.h> |
| #include <__ranges/concepts.h> |
| #include <__ranges/dangling.h> |
| #include <__utility/move.h> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| #if _LIBCPP_STD_VER > 17 |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| namespace ranges { |
| |
| template <class _InIter1, class _InIter2, class _OutIter> |
| using merge_result = in_in_out_result<_InIter1, _InIter2, _OutIter>; |
| |
| namespace __merge { |
| |
| template < |
| class _InIter1, |
| class _Sent1, |
| class _InIter2, |
| class _Sent2, |
| class _OutIter, |
| class _Comp, |
| class _Proj1, |
| class _Proj2> |
| _LIBCPP_HIDE_FROM_ABI constexpr merge_result<__remove_cvref_t<_InIter1>, __remove_cvref_t<_InIter2>, __remove_cvref_t<_OutIter>> |
| __merge_impl( |
| _InIter1&& __first1, |
| _Sent1&& __last1, |
| _InIter2&& __first2, |
| _Sent2&& __last2, |
| _OutIter&& __result, |
| _Comp&& __comp, |
| _Proj1&& __proj1, |
| _Proj2&& __proj2) { |
| for (; __first1 != __last1 && __first2 != __last2; ++__result) { |
| if (std::invoke(__comp, std::invoke(__proj2, *__first2), std::invoke(__proj1, *__first1))) { |
| *__result = *__first2; |
| ++__first2; |
| } else { |
| *__result = *__first1; |
| ++__first1; |
| } |
| } |
| auto __ret1 = ranges::copy(std::move(__first1), std::move(__last1), std::move(__result)); |
| auto __ret2 = ranges::copy(std::move(__first2), std::move(__last2), std::move(__ret1.out)); |
| return {std::move(__ret1.in), std::move(__ret2.in), std::move(__ret2.out)}; |
| } |
| |
| struct __fn { |
| template < |
| input_iterator _InIter1, |
| sentinel_for<_InIter1> _Sent1, |
| input_iterator _InIter2, |
| sentinel_for<_InIter2> _Sent2, |
| weakly_incrementable _OutIter, |
| class _Comp = less, |
| class _Proj1 = identity, |
| class _Proj2 = identity> |
| requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2> |
| _LIBCPP_HIDE_FROM_ABI constexpr merge_result<_InIter1, _InIter2, _OutIter> operator()( |
| _InIter1 __first1, |
| _Sent1 __last1, |
| _InIter2 __first2, |
| _Sent2 __last2, |
| _OutIter __result, |
| _Comp __comp = {}, |
| _Proj1 __proj1 = {}, |
| _Proj2 __proj2 = {}) const { |
| return __merge::__merge_impl(__first1, __last1, __first2, __last2, __result, __comp, __proj1, __proj2); |
| } |
| |
| template < |
| input_range _Range1, |
| input_range _Range2, |
| weakly_incrementable _OutIter, |
| class _Comp = less, |
| class _Proj1 = identity, |
| class _Proj2 = identity> |
| requires mergeable< |
| iterator_t<_Range1>, |
| iterator_t<_Range2>, |
| _OutIter, |
| _Comp, |
| _Proj1, |
| _Proj2> |
| _LIBCPP_HIDE_FROM_ABI constexpr merge_result<borrowed_iterator_t<_Range1>, borrowed_iterator_t<_Range2>, _OutIter> |
| operator()( |
| _Range1&& __range1, |
| _Range2&& __range2, |
| _OutIter __result, |
| _Comp __comp = {}, |
| _Proj1 __proj1 = {}, |
| _Proj2 __proj2 = {}) const { |
| return __merge::__merge_impl( |
| ranges::begin(__range1), |
| ranges::end(__range1), |
| ranges::begin(__range2), |
| ranges::end(__range2), |
| __result, |
| __comp, |
| __proj1, |
| __proj2); |
| } |
| }; |
| |
| } // namespace __merge |
| |
| inline namespace __cpo { |
| inline constexpr auto merge = __merge::__fn{}; |
| } // namespace __cpo |
| } // namespace ranges |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP_STD_VER > 17 |
| |
| #endif // _LIBCPP___ALGORITHM_RANGES_MERGE_H |