libcxx/include/__cxx03/__algorithm/set_union.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_SET_UNION_H
  10 #define _LIBCPP___ALGORITHM_SET_UNION_H
  11
  12 #include <__cxx03/__algorithm/comp.h>
  13 #include <__cxx03/__algorithm/comp_ref_type.h>
  14 #include <__cxx03/__algorithm/copy.h>
  15 #include <__cxx03/__algorithm/iterator_operations.h>
  16 #include <__cxx03/__config>
  17 #include <__cxx03/__iterator/iterator_traits.h>
  18 #include <__cxx03/__utility/move.h>
  19 #include <__cxx03/__utility/pair.h>
  20
  21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  22 #  pragma GCC system_header
  23 #endif
  24
  25 _LIBCPP_PUSH_MACROS
  26 #include <__cxx03/__undef_macros>
  27
  28 _LIBCPP_BEGIN_NAMESPACE_STD
  29
  30 template <class _InIter1, class _InIter2, class _OutIter>
  31 struct __set_union_result {
  32   _InIter1 __in1_;
  33   _InIter2 __in2_;
  34   _OutIter __out_;
  35
  36   // need a constructor as C++03 aggregate init is hard
  37   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
  38   __set_union_result(_InIter1&& __in_iter1, _InIter2&& __in_iter2, _OutIter&& __out_iter)
  39       : __in1_(std::move(__in_iter1)), __in2_(std::move(__in_iter2)), __out_(std::move(__out_iter)) {}
  40 };
  41
  42 template <class _AlgPolicy, class _Compare, class _InIter1, class _Sent1, class _InIter2, class _Sent2, class _OutIter>
  43 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __set_union_result<_InIter1, _InIter2, _OutIter> __set_union(
  44     _InIter1 __first1, _Sent1 __last1, _InIter2 __first2, _Sent2 __last2, _OutIter __result, _Compare&& __comp) {
  45   for (; __first1 != __last1; ++__result) {
  46     if (__first2 == __last2) {
  47       auto __ret1 = std::__copy<_AlgPolicy>(std::move(__first1), std::move(__last1), std::move(__result));
  48       return __set_union_result<_InIter1, _InIter2, _OutIter>(
  49           std::move(__ret1.first), std::move(__first2), std::move((__ret1.second)));
  50     }
  51     if (__comp(*__first2, *__first1)) {
  52       *__result = *__first2;
  53       ++__first2;
  54     } else {
  55       if (!__comp(*__first1, *__first2)) {
  56         ++__first2;
  57       }
  58       *__result = *__first1;
  59       ++__first1;
  60     }
  61   }
  62   auto __ret2 = std::__copy<_AlgPolicy>(std::move(__first2), std::move(__last2), std::move(__result));
  63   return __set_union_result<_InIter1, _InIter2, _OutIter>(
  64       std::move(__first1), std::move(__ret2.first), std::move((__ret2.second)));
  65 }
  66
  67 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare>
  68 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_union(
  69     _InputIterator1 __first1,
  70     _InputIterator1 __last1,
  71     _InputIterator2 __first2,
  72     _InputIterator2 __last2,
  73     _OutputIterator __result,
  74     _Compare __comp) {
  75   return std::__set_union<_ClassicAlgPolicy, __comp_ref_type<_Compare> >(
  76              std::move(__first1),
  77              std::move(__last1),
  78              std::move(__first2),
  79              std::move(__last2),
  80              std::move(__result),
  81              __comp)
  82       .__out_;
  83 }
  84
  85 template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
  86 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_union(
  87     _InputIterator1 __first1,
  88     _InputIterator1 __last1,
  89     _InputIterator2 __first2,
  90     _InputIterator2 __last2,
  91     _OutputIterator __result) {
  92   return std::set_union(
  93       std::move(__first1),
  94       std::move(__last1),
  95       std::move(__first2),
  96       std::move(__last2),
  97       std::move(__result),
  98       __less<>());
  99 }
 100
 101 _LIBCPP_END_NAMESPACE_STD
 102
 103 _LIBCPP_POP_MACROS
 104
 105 #endif // _LIBCPP___ALGORITHM_SET_UNION_H