v1/__algorithm/ranges_set_union.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___ALGORITHM_RANGES_SET_UNION_H
0010 #define _LIBCPP___ALGORITHM_RANGES_SET_UNION_H
0011
0012 #include <__algorithm/in_in_out_result.h>
0013 #include <__algorithm/make_projected.h>
0014 #include <__algorithm/set_union.h>
0015 #include <__config>
0016 #include <__functional/identity.h>
0017 #include <__functional/invoke.h>
0018 #include <__functional/ranges_operations.h>
0019 #include <__iterator/concepts.h>
0020 #include <__iterator/iterator_traits.h>
0021 #include <__iterator/mergeable.h>
0022 #include <__iterator/projected.h>
0023 #include <__ranges/access.h>
0024 #include <__ranges/concepts.h>
0025 #include <__ranges/dangling.h>
0026 #include <__utility/forward.h>
0027 #include <__utility/move.h>
0028
0029 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0030 #  pragma GCC system_header
0031 #endif
0032
0033 _LIBCPP_PUSH_MACROS
0034 #include <__undef_macros>
0035
0036 #if _LIBCPP_STD_VER >= 20
0037
0038 _LIBCPP_BEGIN_NAMESPACE_STD
0039
0040 namespace ranges {
0041
0042 template <class _InIter1, class _InIter2, class _OutIter>
0043 using set_union_result = in_in_out_result<_InIter1, _InIter2, _OutIter>;
0044
0045 struct __set_union {
0046   template <input_iterator _InIter1,
0047             sentinel_for<_InIter1> _Sent1,
0048             input_iterator _InIter2,
0049             sentinel_for<_InIter2> _Sent2,
0050             weakly_incrementable _OutIter,
0051             class _Comp  = ranges::less,
0052             class _Proj1 = identity,
0053             class _Proj2 = identity>
0054     requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2>
0055   _LIBCPP_HIDE_FROM_ABI constexpr set_union_result<_InIter1, _InIter2, _OutIter> operator()(
0056       _InIter1 __first1,
0057       _Sent1 __last1,
0058       _InIter2 __first2,
0059       _Sent2 __last2,
0060       _OutIter __result,
0061       _Comp __comp   = {},
0062       _Proj1 __proj1 = {},
0063       _Proj2 __proj2 = {}) const {
0064     auto __ret = std::__set_union(
0065         std::move(__first1),
0066         std::move(__last1),
0067         std::move(__first2),
0068         std::move(__last2),
0069         std::move(__result),
0070         ranges::__make_projected_comp(__comp, __proj1, __proj2));
0071     return {std::move(__ret.__in1_), std::move(__ret.__in2_), std::move(__ret.__out_)};
0072   }
0073
0074   template <input_range _Range1,
0075             input_range _Range2,
0076             weakly_incrementable _OutIter,
0077             class _Comp  = ranges::less,
0078             class _Proj1 = identity,
0079             class _Proj2 = identity>
0080     requires mergeable<iterator_t<_Range1>, iterator_t<_Range2>, _OutIter, _Comp, _Proj1, _Proj2>
0081   _LIBCPP_HIDE_FROM_ABI constexpr set_union_result<borrowed_iterator_t<_Range1>, borrowed_iterator_t<_Range2>, _OutIter>
0082   operator()(_Range1&& __range1,
0083              _Range2&& __range2,
0084              _OutIter __result,
0085              _Comp __comp   = {},
0086              _Proj1 __proj1 = {},
0087              _Proj2 __proj2 = {}) const {
0088     auto __ret = std::__set_union(
0089         ranges::begin(__range1),
0090         ranges::end(__range1),
0091         ranges::begin(__range2),
0092         ranges::end(__range2),
0093         std::move(__result),
0094         ranges::__make_projected_comp(__comp, __proj1, __proj2));
0095     return {std::move(__ret.__in1_), std::move(__ret.__in2_), std::move(__ret.__out_)};
0096   }
0097 };
0098
0099 inline namespace __cpo {
0100 inline constexpr auto set_union = __set_union{};
0101 } // namespace __cpo
0102 } // namespace ranges
0103
0104 _LIBCPP_END_NAMESPACE_STD
0105
0106 #endif // _LIBCPP_STD_VER >= 20
0107
0108 _LIBCPP_POP_MACROS
0109
0110 #endif // _LIBCPP___ALGORITHM_RANGES_SET_UNION_H