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d10dc5a06f
We originally put implementation-detail function objects into individual namespaces for `std::ranges` without a good reason for doing so. This practice was continued, presumably because there was prior art. Since there's no reason to keep these namespaces, this commit removes them, which will slightly impact binary size. This commit does not apply to CPOs, some of which need additional work.
135 lines
4.4 KiB
C++
135 lines
4.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ALGORITHM_RANGES_MERGE_H
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#define _LIBCPP___ALGORITHM_RANGES_MERGE_H
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#include <__algorithm/in_in_out_result.h>
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#include <__algorithm/ranges_copy.h>
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#include <__config>
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#include <__functional/identity.h>
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#include <__functional/invoke.h>
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#include <__functional/ranges_operations.h>
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#include <__iterator/concepts.h>
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#include <__iterator/mergeable.h>
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#include <__ranges/access.h>
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#include <__ranges/concepts.h>
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#include <__ranges/dangling.h>
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#include <__type_traits/remove_cvref.h>
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#include <__utility/move.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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#if _LIBCPP_STD_VER >= 20
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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template <class _InIter1, class _InIter2, class _OutIter>
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using merge_result = in_in_out_result<_InIter1, _InIter2, _OutIter>;
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struct __merge {
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template <input_iterator _InIter1,
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sentinel_for<_InIter1> _Sent1,
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input_iterator _InIter2,
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sentinel_for<_InIter2> _Sent2,
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weakly_incrementable _OutIter,
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class _Comp = less,
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class _Proj1 = identity,
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class _Proj2 = identity>
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requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2>
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_LIBCPP_HIDE_FROM_ABI constexpr merge_result<_InIter1, _InIter2, _OutIter> operator()(
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_InIter1 __first1,
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_Sent1 __last1,
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_InIter2 __first2,
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_Sent2 __last2,
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_OutIter __result,
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_Comp __comp = {},
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_Proj1 __proj1 = {},
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_Proj2 __proj2 = {}) const {
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return __merge::__merge_impl(__first1, __last1, __first2, __last2, __result, __comp, __proj1, __proj2);
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}
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template <input_range _Range1,
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input_range _Range2,
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weakly_incrementable _OutIter,
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class _Comp = less,
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class _Proj1 = identity,
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class _Proj2 = identity>
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requires mergeable<iterator_t<_Range1>, iterator_t<_Range2>, _OutIter, _Comp, _Proj1, _Proj2>
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_LIBCPP_HIDE_FROM_ABI constexpr merge_result<borrowed_iterator_t<_Range1>, borrowed_iterator_t<_Range2>, _OutIter>
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operator()(_Range1&& __range1,
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_Range2&& __range2,
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_OutIter __result,
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_Comp __comp = {},
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_Proj1 __proj1 = {},
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_Proj2 __proj2 = {}) const {
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return __merge::__merge_impl(
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ranges::begin(__range1),
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ranges::end(__range1),
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ranges::begin(__range2),
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ranges::end(__range2),
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__result,
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__comp,
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__proj1,
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__proj2);
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}
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template < class _InIter1,
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class _Sent1,
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class _InIter2,
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class _Sent2,
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class _OutIter,
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class _Comp,
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class _Proj1,
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class _Proj2>
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_LIBCPP_HIDE_FROM_ABI static constexpr merge_result<__remove_cvref_t<_InIter1>,
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__remove_cvref_t<_InIter2>,
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__remove_cvref_t<_OutIter>>
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__merge_impl(_InIter1&& __first1,
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_Sent1&& __last1,
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_InIter2&& __first2,
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_Sent2&& __last2,
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_OutIter&& __result,
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_Comp&& __comp,
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_Proj1&& __proj1,
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_Proj2&& __proj2) {
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for (; __first1 != __last1 && __first2 != __last2; ++__result) {
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if (std::invoke(__comp, std::invoke(__proj2, *__first2), std::invoke(__proj1, *__first1))) {
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*__result = *__first2;
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++__first2;
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} else {
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*__result = *__first1;
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++__first1;
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}
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}
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auto __ret1 = ranges::copy(std::move(__first1), std::move(__last1), std::move(__result));
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auto __ret2 = ranges::copy(std::move(__first2), std::move(__last2), std::move(__ret1.out));
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return {std::move(__ret1.in), std::move(__ret2.in), std::move(__ret2.out)};
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}
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};
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inline namespace __cpo {
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inline constexpr auto merge = __merge{};
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} // namespace __cpo
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} // namespace ranges
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___ALGORITHM_RANGES_MERGE_H
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