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