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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_RANGES_MERGE_H
#define _LIBCPP___ALGORITHM_RANGES_MERGE_H
#include <__algorithm/in_in_out_result.h>
#include <__algorithm/ranges_copy.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/invoke.h>
#include <__functional/ranges_operations.h>
#include <__iterator/concepts.h>
#include <__iterator/mergeable.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__ranges/dangling.h>
#include <__type_traits/remove_cvref.h>
#include <__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#if _LIBCPP_STD_VER >= 20
_LIBCPP_BEGIN_NAMESPACE_STD
namespace ranges {
template <class _InIter1, class _InIter2, class _OutIter>
using merge_result = in_in_out_result<_InIter1, _InIter2, _OutIter>;
namespace __merge {
template < class _InIter1,
class _Sent1,
class _InIter2,
class _Sent2,
class _OutIter,
class _Comp,
class _Proj1,
class _Proj2>
_LIBCPP_HIDE_FROM_ABI constexpr merge_result<__remove_cvref_t<_InIter1>,
__remove_cvref_t<_InIter2>,
__remove_cvref_t<_OutIter>>
__merge_impl(_InIter1&& __first1,
_Sent1&& __last1,
_InIter2&& __first2,
_Sent2&& __last2,
_OutIter&& __result,
_Comp&& __comp,
_Proj1&& __proj1,
_Proj2&& __proj2) {
for (; __first1 != __last1 && __first2 != __last2; ++__result) {
if (std::invoke(__comp, std::invoke(__proj2, *__first2), std::invoke(__proj1, *__first1))) {
*__result = *__first2;
++__first2;
} else {
*__result = *__first1;
++__first1;
}
}
auto __ret1 = ranges::copy(std::move(__first1), std::move(__last1), std::move(__result));
auto __ret2 = ranges::copy(std::move(__first2), std::move(__last2), std::move(__ret1.out));
return {std::move(__ret1.in), std::move(__ret2.in), std::move(__ret2.out)};
}
struct __fn {
template <input_iterator _InIter1,
sentinel_for<_InIter1> _Sent1,
input_iterator _InIter2,
sentinel_for<_InIter2> _Sent2,
weakly_incrementable _OutIter,
class _Comp = less,
class _Proj1 = identity,
class _Proj2 = identity>
requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2>
_LIBCPP_HIDE_FROM_ABI constexpr merge_result<_InIter1, _InIter2, _OutIter> operator()(
_InIter1 __first1,
_Sent1 __last1,
_InIter2 __first2,
_Sent2 __last2,
_OutIter __result,
_Comp __comp = {},
_Proj1 __proj1 = {},
_Proj2 __proj2 = {}) const {
return __merge::__merge_impl(__first1, __last1, __first2, __last2, __result, __comp, __proj1, __proj2);
}
template <input_range _Range1,
input_range _Range2,
weakly_incrementable _OutIter,
class _Comp = less,
class _Proj1 = identity,
class _Proj2 = identity>
requires mergeable<iterator_t<_Range1>, iterator_t<_Range2>, _OutIter, _Comp, _Proj1, _Proj2>
_LIBCPP_HIDE_FROM_ABI constexpr merge_result<borrowed_iterator_t<_Range1>, borrowed_iterator_t<_Range2>, _OutIter>
operator()(_Range1&& __range1,
_Range2&& __range2,
_OutIter __result,
_Comp __comp = {},
_Proj1 __proj1 = {},
_Proj2 __proj2 = {}) const {
return __merge::__merge_impl(
ranges::begin(__range1),
ranges::end(__range1),
ranges::begin(__range2),
ranges::end(__range2),
__result,
__comp,
__proj1,
__proj2);
}
};
} // namespace __merge
inline namespace __cpo {
inline constexpr auto merge = __merge::__fn{};
} // namespace __cpo
} // namespace ranges
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER >= 20
#endif // _LIBCPP___ALGORITHM_RANGES_MERGE_H
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