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1 //===----------------------------------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #ifndef _LIBCPP___ALGORITHM_RANGES_SET_DIFFERENCE_H
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10 #define _LIBCPP___ALGORITHM_RANGES_SET_DIFFERENCE_H
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11
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12 #include <__algorithm/in_out_result.h>
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13 #include <__algorithm/iterator_operations.h>
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14 #include <__algorithm/make_projected.h>
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15 #include <__algorithm/set_difference.h>
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16 #include <__config>
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17 #include <__functional/identity.h>
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18 #include <__functional/invoke.h>
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19 #include <__functional/ranges_operations.h>
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20 #include <__iterator/concepts.h>
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21 #include <__iterator/mergeable.h>
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22 #include <__ranges/access.h>
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23 #include <__ranges/concepts.h>
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24 #include <__ranges/dangling.h>
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25 #include <__type_traits/decay.h>
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26 #include <__utility/move.h>
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27 #include <__utility/pair.h>
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28
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29 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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30 # pragma GCC system_header
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31 #endif
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32
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252
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33 #if _LIBCPP_STD_VER >= 20
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34
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35 _LIBCPP_BEGIN_NAMESPACE_STD
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36
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37 namespace ranges {
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38
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39 template <class _InIter, class _OutIter>
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40 using set_difference_result = in_out_result<_InIter, _OutIter>;
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41
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42 namespace __set_difference {
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43
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44 struct __fn {
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45 template <input_iterator _InIter1,
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46 sentinel_for<_InIter1> _Sent1,
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47 input_iterator _InIter2,
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48 sentinel_for<_InIter2> _Sent2,
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49 weakly_incrementable _OutIter,
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50 class _Comp = less,
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51 class _Proj1 = identity,
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52 class _Proj2 = identity>
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53 requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2>
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54 _LIBCPP_HIDE_FROM_ABI constexpr set_difference_result<_InIter1, _OutIter> operator()(
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55 _InIter1 __first1,
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56 _Sent1 __last1,
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57 _InIter2 __first2,
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58 _Sent2 __last2,
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59 _OutIter __result,
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60 _Comp __comp = {},
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61 _Proj1 __proj1 = {},
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62 _Proj2 __proj2 = {}) const {
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63 auto __ret = std::__set_difference<_RangeAlgPolicy>(
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64 __first1, __last1, __first2, __last2, __result, ranges::__make_projected_comp(__comp, __proj1, __proj2));
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65 return {std::move(__ret.first), std::move(__ret.second)};
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66 }
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67
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68 template <input_range _Range1,
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69 input_range _Range2,
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70 weakly_incrementable _OutIter,
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71 class _Comp = less,
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72 class _Proj1 = identity,
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73 class _Proj2 = identity>
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74 requires mergeable<iterator_t<_Range1>, iterator_t<_Range2>, _OutIter, _Comp, _Proj1, _Proj2>
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75 _LIBCPP_HIDE_FROM_ABI constexpr set_difference_result<borrowed_iterator_t<_Range1>, _OutIter>
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76 operator()(_Range1&& __range1,
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77 _Range2&& __range2,
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78 _OutIter __result,
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79 _Comp __comp = {},
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80 _Proj1 __proj1 = {},
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81 _Proj2 __proj2 = {}) const {
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82 auto __ret = std::__set_difference<_RangeAlgPolicy>(
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83 ranges::begin(__range1),
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84 ranges::end(__range1),
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85 ranges::begin(__range2),
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86 ranges::end(__range2),
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87 __result,
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88 ranges::__make_projected_comp(__comp, __proj1, __proj2));
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89 return {std::move(__ret.first), std::move(__ret.second)};
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90 }
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91 };
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92
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93 } // namespace __set_difference
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94
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95 inline namespace __cpo {
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96 inline constexpr auto set_difference = __set_difference::__fn{};
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236
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97 } // namespace __cpo
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98 } // namespace ranges
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99
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100 _LIBCPP_END_NAMESPACE_STD
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101
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252
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102 #endif // _LIBCPP_STD_VER >= 20
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103 #endif // _LIBCPP___ALGORITHM_RANGES_SET_DIFFERENCE_H
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