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Diffstat (limited to 'libcxx/include/__algorithm/ranges_reverse_copy.h')
-rw-r--r-- | libcxx/include/__algorithm/ranges_reverse_copy.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/libcxx/include/__algorithm/ranges_reverse_copy.h b/libcxx/include/__algorithm/ranges_reverse_copy.h new file mode 100644 index 000000000000..e2da9b484aaf --- /dev/null +++ b/libcxx/include/__algorithm/ranges_reverse_copy.h @@ -0,0 +1,67 @@ +//===----------------------------------------------------------------------===// +// +// 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_REVERSE_COPY_H +#define _LIBCPP___ALGORITHM_RANGES_REVERSE_COPY_H + +#include <__algorithm/in_out_result.h> +#include <__algorithm/ranges_copy.h> +#include <__config> +#include <__iterator/concepts.h> +#include <__iterator/next.h> +#include <__iterator/reverse_iterator.h> +#include <__ranges/access.h> +#include <__ranges/concepts.h> +#include <__ranges/dangling.h> +#include <__ranges/subrange.h> +#include <__utility/move.h> + +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +# pragma GCC system_header +#endif + +#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) + +_LIBCPP_BEGIN_NAMESPACE_STD + +namespace ranges { + +template <class _InIter, class _OutIter> +using reverse_copy_result = in_out_result<_InIter, _OutIter>; + +namespace __reverse_copy { +struct __fn { + + template <bidirectional_iterator _InIter, sentinel_for<_InIter> _Sent, weakly_incrementable _OutIter> + requires indirectly_copyable<_InIter, _OutIter> + _LIBCPP_HIDE_FROM_ABI constexpr + reverse_copy_result<_InIter, _OutIter> operator()(_InIter __first, _Sent __last, _OutIter __result) const { + return (*this)(subrange(std::move(__first), std::move(__last)), std::move(__result)); + } + + template <bidirectional_range _Range, weakly_incrementable _OutIter> + requires indirectly_copyable<iterator_t<_Range>, _OutIter> + _LIBCPP_HIDE_FROM_ABI constexpr + reverse_copy_result<borrowed_iterator_t<_Range>, _OutIter> operator()(_Range&& __range, _OutIter __result) const { + auto __ret = ranges::copy(std::__reverse_range(__range), std::move(__result)); + return {ranges::next(ranges::begin(__range), ranges::end(__range)), std::move(__ret.out)}; + } + +}; +} // namespace __reverse_copy + +inline namespace __cpo { + inline constexpr auto reverse_copy = __reverse_copy::__fn{}; +} // namespace __cpo +} // namespace ranges + +_LIBCPP_END_NAMESPACE_STD + +#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES) + +#endif // _LIBCPP___ALGORITHM_RANGES_REVERSE_COPY_H |