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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ALGORITHM_SET_UNION_H
#define _LIBCPP___ALGORITHM_SET_UNION_H
#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__algorithm/copy.h>
#include <__config>
#include <__iterator/iterator_traits.h>
#include <__utility/move.h>
#include <__utility/pair.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _InIter1, class _InIter2, class _OutIter>
struct __set_union_result {
_InIter1 __in1_;
_InIter2 __in2_;
_OutIter __out_;
// need a constructor as C++03 aggregate init is hard
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
__set_union_result(_InIter1&& __in_iter1, _InIter2&& __in_iter2, _OutIter&& __out_iter)
: __in1_(std::move(__in_iter1)), __in2_(std::move(__in_iter2)), __out_(std::move(__out_iter)) {}
};
template <class _Compare, class _InIter1, class _Sent1, class _InIter2, class _Sent2, class _OutIter>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __set_union_result<_InIter1, _InIter2, _OutIter> __set_union(
_InIter1 __first1, _Sent1 __last1, _InIter2 __first2, _Sent2 __last2, _OutIter __result, _Compare&& __comp) {
for (; __first1 != __last1; ++__result) {
if (__first2 == __last2) {
auto __ret1 = std::__copy_impl(std::move(__first1), std::move(__last1), std::move(__result));
return __set_union_result<_InIter1, _InIter2, _OutIter>(
std::move(__ret1.first), std::move(__first2), std::move((__ret1.second)));
}
if (__comp(*__first2, *__first1)) {
*__result = *__first2;
++__first2;
} else {
if (!__comp(*__first1, *__first2)) {
++__first2;
}
*__result = *__first1;
++__first1;
}
}
auto __ret2 = std::__copy_impl(std::move(__first2), std::move(__last2), std::move(__result));
return __set_union_result<_InIter1, _InIter2, _OutIter>(
std::move(__first1), std::move(__ret2.first), std::move((__ret2.second)));
}
template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_union(
_InputIterator1 __first1,
_InputIterator1 __last1,
_InputIterator2 __first2,
_InputIterator2 __last2,
_OutputIterator __result,
_Compare __comp) {
return std::__set_union<__comp_ref_type<_Compare> >(
std::move(__first1),
std::move(__last1),
std::move(__first2),
std::move(__last2),
std::move(__result),
__comp)
.__out_;
}
template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator set_union(
_InputIterator1 __first1,
_InputIterator1 __last1,
_InputIterator2 __first2,
_InputIterator2 __last2,
_OutputIterator __result) {
return std::set_union(
std::move(__first1),
std::move(__last1),
std::move(__first2),
std::move(__last2),
std::move(__result),
__less<typename iterator_traits<_InputIterator1>::value_type,
typename iterator_traits<_InputIterator2>::value_type>());
}
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ALGORITHM_SET_UNION_H
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