libcxx/include/__cxx03/__algorithm/ranges_set_difference.h

   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 <__cxx03/__algorithm/in_out_result.h>
  13 #include <__cxx03/__algorithm/iterator_operations.h>
  14 #include <__cxx03/__algorithm/make_projected.h>
  15 #include <__cxx03/__algorithm/set_difference.h>
  16 #include <__cxx03/__config>
  17 #include <__cxx03/__functional/identity.h>
  18 #include <__cxx03/__functional/invoke.h>
  19 #include <__cxx03/__functional/ranges_operations.h>
  20 #include <__cxx03/__iterator/concepts.h>
  21 #include <__cxx03/__iterator/mergeable.h>
  22 #include <__cxx03/__ranges/access.h>
  23 #include <__cxx03/__ranges/concepts.h>
  24 #include <__cxx03/__ranges/dangling.h>
  25 #include <__cxx03/__type_traits/decay.h>
  26 #include <__cxx03/__utility/move.h>
  27 #include <__cxx03/__utility/pair.h>
  28
  29 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  30 #  pragma GCC system_header
  31 #endif
  32
  33 _LIBCPP_PUSH_MACROS
  34 #include <__cxx03/__undef_macros>
  35
  36 #if _LIBCPP_STD_VER >= 20
  37
  38 _LIBCPP_BEGIN_NAMESPACE_STD
  39
  40 namespace ranges {
  41
  42 template <class _InIter, class _OutIter>
  43 using set_difference_result = in_out_result<_InIter, _OutIter>;
  44
  45 namespace __set_difference {
  46
  47 struct __fn {
  48   template <input_iterator _InIter1,
  49             sentinel_for<_InIter1> _Sent1,
  50             input_iterator _InIter2,
  51             sentinel_for<_InIter2> _Sent2,
  52             weakly_incrementable _OutIter,
  53             class _Comp  = less,
  54             class _Proj1 = identity,
  55             class _Proj2 = identity>
  56     requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2>
  57   _LIBCPP_HIDE_FROM_ABI constexpr set_difference_result<_InIter1, _OutIter> operator()(
  58       _InIter1 __first1,
  59       _Sent1 __last1,
  60       _InIter2 __first2,
  61       _Sent2 __last2,
  62       _OutIter __result,
  63       _Comp __comp   = {},
  64       _Proj1 __proj1 = {},
  65       _Proj2 __proj2 = {}) const {
  66     auto __ret = std::__set_difference<_RangeAlgPolicy>(
  67         __first1, __last1, __first2, __last2, __result, ranges::__make_projected_comp(__comp, __proj1, __proj2));
  68     return {std::move(__ret.first), std::move(__ret.second)};
  69   }
  70
  71   template <input_range _Range1,
  72             input_range _Range2,
  73             weakly_incrementable _OutIter,
  74             class _Comp  = less,
  75             class _Proj1 = identity,
  76             class _Proj2 = identity>
  77     requires mergeable<iterator_t<_Range1>, iterator_t<_Range2>, _OutIter, _Comp, _Proj1, _Proj2>
  78   _LIBCPP_HIDE_FROM_ABI constexpr set_difference_result<borrowed_iterator_t<_Range1>, _OutIter>
  79   operator()(_Range1&& __range1,
  80              _Range2&& __range2,
  81              _OutIter __result,
  82              _Comp __comp   = {},
  83              _Proj1 __proj1 = {},
  84              _Proj2 __proj2 = {}) const {
  85     auto __ret = std::__set_difference<_RangeAlgPolicy>(
  86         ranges::begin(__range1),
  87         ranges::end(__range1),
  88         ranges::begin(__range2),
  89         ranges::end(__range2),
  90         __result,
  91         ranges::__make_projected_comp(__comp, __proj1, __proj2));
  92     return {std::move(__ret.first), std::move(__ret.second)};
  93   }
  94 };
  95
  96 } // namespace __set_difference
  97
  98 inline namespace __cpo {
  99 inline constexpr auto set_difference = __set_difference::__fn{};
 100 } // namespace __cpo
 101 } // namespace ranges
 102
 103 _LIBCPP_END_NAMESPACE_STD
 104
 105 #endif // _LIBCPP_STD_VER >= 20
 106
 107 _LIBCPP_POP_MACROS
 108
 109 #endif // _LIBCPP___ALGORITHM_RANGES_SET_DIFFERENCE_H