__cxx03/__algorithm/ranges_set_difference.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_DIFFERENCE_H
0010 #define _LIBCPP___CXX03___ALGORITHM_RANGES_SET_DIFFERENCE_H
0011
0012 #include <__cxx03/__algorithm/in_out_result.h>
0013 #include <__cxx03/__algorithm/iterator_operations.h>
0014 #include <__cxx03/__algorithm/make_projected.h>
0015 #include <__cxx03/__algorithm/set_difference.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/mergeable.h>
0022 #include <__cxx03/__ranges/access.h>
0023 #include <__cxx03/__ranges/concepts.h>
0024 #include <__cxx03/__ranges/dangling.h>
0025 #include <__cxx03/__type_traits/decay.h>
0026 #include <__cxx03/__utility/move.h>
0027 #include <__cxx03/__utility/pair.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 <__cxx03/__undef_macros>
0035
0036 #if _LIBCPP_STD_VER >= 20
0037
0038 _LIBCPP_BEGIN_NAMESPACE_STD
0039
0040 namespace ranges {
0041
0042 template <class _InIter, class _OutIter>
0043 using set_difference_result = in_out_result<_InIter, _OutIter>;
0044
0045 namespace __set_difference {
0046
0047 struct __fn {
0048   template <input_iterator _InIter1,
0049             sentinel_for<_InIter1> _Sent1,
0050             input_iterator _InIter2,
0051             sentinel_for<_InIter2> _Sent2,
0052             weakly_incrementable _OutIter,
0053             class _Comp  = less,
0054             class _Proj1 = identity,
0055             class _Proj2 = identity>
0056     requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2>
0057   _LIBCPP_HIDE_FROM_ABI constexpr set_difference_result<_InIter1, _OutIter> operator()(
0058       _InIter1 __first1,
0059       _Sent1 __last1,
0060       _InIter2 __first2,
0061       _Sent2 __last2,
0062       _OutIter __result,
0063       _Comp __comp   = {},
0064       _Proj1 __proj1 = {},
0065       _Proj2 __proj2 = {}) const {
0066     auto __ret = std::__set_difference<_RangeAlgPolicy>(
0067         __first1, __last1, __first2, __last2, __result, ranges::__make_projected_comp(__comp, __proj1, __proj2));
0068     return {std::move(__ret.first), std::move(__ret.second)};
0069   }
0070
0071   template <input_range _Range1,
0072             input_range _Range2,
0073             weakly_incrementable _OutIter,
0074             class _Comp  = less,
0075             class _Proj1 = identity,
0076             class _Proj2 = identity>
0077     requires mergeable<iterator_t<_Range1>, iterator_t<_Range2>, _OutIter, _Comp, _Proj1, _Proj2>
0078   _LIBCPP_HIDE_FROM_ABI constexpr set_difference_result<borrowed_iterator_t<_Range1>, _OutIter>
0079   operator()(_Range1&& __range1,
0080              _Range2&& __range2,
0081              _OutIter __result,
0082              _Comp __comp   = {},
0083              _Proj1 __proj1 = {},
0084              _Proj2 __proj2 = {}) const {
0085     auto __ret = std::__set_difference<_RangeAlgPolicy>(
0086         ranges::begin(__range1),
0087         ranges::end(__range1),
0088         ranges::begin(__range2),
0089         ranges::end(__range2),
0090         __result,
0091         ranges::__make_projected_comp(__comp, __proj1, __proj2));
0092     return {std::move(__ret.first), std::move(__ret.second)};
0093   }
0094 };
0095
0096 } // namespace __set_difference
0097
0098 inline namespace __cpo {
0099 inline constexpr auto set_difference = __set_difference::__fn{};
0100 } // namespace __cpo
0101 } // namespace ranges
0102
0103 _LIBCPP_END_NAMESPACE_STD
0104
0105 #endif // _LIBCPP_STD_VER >= 20
0106
0107 _LIBCPP_POP_MACROS
0108
0109 #endif // _LIBCPP___CXX03___ALGORITHM_RANGES_SET_DIFFERENCE_H