forked from OSchip/llvm-project
117 lines
4.4 KiB
C++
117 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_UNIQUE_COPY_H
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#define _LIBCPP___ALGORITHM_RANGES_UNIQUE_COPY_H
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#include <__algorithm/in_out_result.h>
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#include <__algorithm/iterator_operations.h>
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#include <__algorithm/make_projected.h>
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#include <__algorithm/unique_copy.h>
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#include <__concepts/same_as.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/iterator_traits.h>
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#include <__iterator/projected.h>
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#include <__iterator/readable_traits.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 <__utility/forward.h>
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#include <__utility/move.h>
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#include <__utility/pair.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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#if _LIBCPP_STD_VER > 17
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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template <class _InIter, class _OutIter>
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using unique_copy_result = in_out_result<_InIter, _OutIter>;
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namespace __unique_copy {
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template <class _InIter, class _OutIter>
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concept __can_reread_from_output = (input_iterator<_OutIter> && same_as<iter_value_t<_InIter>, iter_value_t<_OutIter>>);
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struct __fn {
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template <class _InIter, class _OutIter>
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static consteval auto __get_algo_tag() {
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if constexpr (forward_iterator<_InIter>) {
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return __unique_copy_tags::__reread_from_input_tag{};
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} else if constexpr (__can_reread_from_output<_InIter, _OutIter>) {
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return __unique_copy_tags::__reread_from_output_tag{};
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} else if constexpr (indirectly_copyable_storable<_InIter, _OutIter>) {
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return __unique_copy_tags::__read_from_tmp_value_tag{};
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}
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}
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template <class _InIter, class _OutIter>
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using __algo_tag_t = decltype(__get_algo_tag<_InIter, _OutIter>());
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template <input_iterator _InIter,
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sentinel_for<_InIter> _Sent,
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weakly_incrementable _OutIter,
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class _Proj = identity,
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indirect_equivalence_relation<projected<_InIter, _Proj>> _Comp = ranges::equal_to>
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requires indirectly_copyable<_InIter, _OutIter> &&
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(forward_iterator<_InIter> ||
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(input_iterator<_OutIter> && same_as<iter_value_t<_InIter>, iter_value_t<_OutIter>>) ||
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indirectly_copyable_storable<_InIter, _OutIter>)
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_LIBCPP_HIDE_FROM_ABI constexpr unique_copy_result<_InIter, _OutIter>
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operator()(_InIter __first, _Sent __last, _OutIter __result, _Comp __comp = {}, _Proj __proj = {}) const {
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auto __ret = std::__unique_copy<_RangeAlgPolicy>(
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std::move(__first),
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std::move(__last),
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std::move(__result),
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std::__make_projected(__comp, __proj),
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__algo_tag_t<_InIter, _OutIter>());
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return {std::move(__ret.first), std::move(__ret.second)};
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}
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template <input_range _Range,
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weakly_incrementable _OutIter,
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class _Proj = identity,
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indirect_equivalence_relation<projected<iterator_t<_Range>, _Proj>> _Comp = ranges::equal_to>
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requires indirectly_copyable<iterator_t<_Range>, _OutIter> &&
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(forward_iterator<iterator_t<_Range>> ||
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(input_iterator<_OutIter> && same_as<range_value_t<_Range>, iter_value_t<_OutIter>>) ||
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indirectly_copyable_storable<iterator_t<_Range>, _OutIter>)
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_LIBCPP_HIDE_FROM_ABI constexpr unique_copy_result<borrowed_iterator_t<_Range>, _OutIter>
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operator()(_Range&& __range, _OutIter __result, _Comp __comp = {}, _Proj __proj = {}) const {
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auto __ret = std::__unique_copy<_RangeAlgPolicy>(
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ranges::begin(__range),
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ranges::end(__range),
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std::move(__result),
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std::__make_projected(__comp, __proj),
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__algo_tag_t<iterator_t<_Range>, _OutIter>());
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return {std::move(__ret.first), std::move(__ret.second)};
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}
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};
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} // namespace __unique_copy
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inline namespace __cpo {
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inline constexpr auto unique_copy = __unique_copy::__fn{};
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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 > 17
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#endif // _LIBCPP___ALGORITHM_RANGES_UNIQUE_COPY_H
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