__cxx03/__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___CXX03___ALGORITHM_RANGES_SET_UNION_H
0010 #define _LIBCPP___CXX03___ALGORITHM_RANGES_SET_UNION_H
0011
0012 #include <__cxx03/__algorithm/in_in_out_result.h>
0013 #include <__cxx03/__algorithm/iterator_operations.h>
0014 #include <__cxx03/__algorithm/make_projected.h>
0015 #include <__cxx03/__algorithm/set_union.h>
0016 #include <__cxx03/__config>
0017 #include <__cxx03/__functional/identity.h>
0018 #include <__cxx03/__functional/invoke.h>
0019 #include <__cxx03/__functional/ranges_operations.h>
0020 #include <__cxx03/__iterator/concepts.h>
0021 #include <__cxx03/__iterator/iterator_traits.h>
0022 #include <__cxx03/__iterator/mergeable.h>
0023 #include <__cxx03/__iterator/projected.h>
0024 #include <__cxx03/__ranges/access.h>
0025 #include <__cxx03/__ranges/concepts.h>
0026 #include <__cxx03/__ranges/dangling.h>
0027 #include <__cxx03/__utility/forward.h>
0028 #include <__cxx03/__utility/move.h>
0029
0030 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0031 #  pragma GCC system_header
0032 #endif
0033
0034 _LIBCPP_PUSH_MACROS
0035 #include <__cxx03/__undef_macros>
0036
0037 #if _LIBCPP_STD_VER >= 20
0038
0039 _LIBCPP_BEGIN_NAMESPACE_STD
0040
0041 namespace ranges {
0042
0043 template <class _InIter1, class _InIter2, class _OutIter>
0044 using set_union_result = in_in_out_result<_InIter1, _InIter2, _OutIter>;
0045
0046 namespace __set_union {
0047
0048 struct __fn {
0049   template <input_iterator _InIter1,
0050             sentinel_for<_InIter1> _Sent1,
0051             input_iterator _InIter2,
0052             sentinel_for<_InIter2> _Sent2,
0053             weakly_incrementable _OutIter,
0054             class _Comp  = ranges::less,
0055             class _Proj1 = identity,
0056             class _Proj2 = identity>
0057     requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2>
0058   _LIBCPP_HIDE_FROM_ABI constexpr set_union_result<_InIter1, _InIter2, _OutIter> operator()(
0059       _InIter1 __first1,
0060       _Sent1 __last1,
0061       _InIter2 __first2,
0062       _Sent2 __last2,
0063       _OutIter __result,
0064       _Comp __comp   = {},
0065       _Proj1 __proj1 = {},
0066       _Proj2 __proj2 = {}) const {
0067     auto __ret = std::__set_union<_RangeAlgPolicy>(
0068         std::move(__first1),
0069         std::move(__last1),
0070         std::move(__first2),
0071         std::move(__last2),
0072         std::move(__result),
0073         ranges::__make_projected_comp(__comp, __proj1, __proj2));
0074     return {std::move(__ret.__in1_), std::move(__ret.__in2_), std::move(__ret.__out_)};
0075   }
0076
0077   template <input_range _Range1,
0078             input_range _Range2,
0079             weakly_incrementable _OutIter,
0080             class _Comp  = ranges::less,
0081             class _Proj1 = identity,
0082             class _Proj2 = identity>
0083     requires mergeable<iterator_t<_Range1>, iterator_t<_Range2>, _OutIter, _Comp, _Proj1, _Proj2>
0084   _LIBCPP_HIDE_FROM_ABI constexpr set_union_result<borrowed_iterator_t<_Range1>, borrowed_iterator_t<_Range2>, _OutIter>
0085   operator()(_Range1&& __range1,
0086              _Range2&& __range2,
0087              _OutIter __result,
0088              _Comp __comp   = {},
0089              _Proj1 __proj1 = {},
0090              _Proj2 __proj2 = {}) const {
0091     auto __ret = std::__set_union<_RangeAlgPolicy>(
0092         ranges::begin(__range1),
0093         ranges::end(__range1),
0094         ranges::begin(__range2),
0095         ranges::end(__range2),
0096         std::move(__result),
0097         ranges::__make_projected_comp(__comp, __proj1, __proj2));
0098     return {std::move(__ret.__in1_), std::move(__ret.__in2_), std::move(__ret.__out_)};
0099   }
0100 };
0101
0102 } // namespace __set_union
0103
0104 inline namespace __cpo {
0105 inline constexpr auto set_union = __set_union::__fn{};
0106 } // namespace __cpo
0107 } // namespace ranges
0108
0109 _LIBCPP_END_NAMESPACE_STD
0110
0111 #endif // _LIBCPP_STD_VER >= 20
0112
0113 _LIBCPP_POP_MACROS
0114
0115 #endif // _LIBCPP___CXX03___ALGORITHM_RANGES_SET_UNION_H