libcxx/include/__algorithm/ranges_copy_backward.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___ALGORITHM_RANGES_COPY_BACKWARD_H
  10 #define _LIBCPP___ALGORITHM_RANGES_COPY_BACKWARD_H
  11
  12 #include <__algorithm/copy_backward.h>
  13 #include <__algorithm/in_out_result.h>
  14 #include <__algorithm/iterator_operations.h>
  15 #include <__config>
  16 #include <__iterator/concepts.h>
  17 #include <__ranges/access.h>
  18 #include <__ranges/concepts.h>
  19 #include <__ranges/dangling.h>
  20 #include <__utility/move.h>
  21
  22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  23 #  pragma GCC system_header
  24 #endif
  25
  26 #if _LIBCPP_STD_VER >= 20
  27
  28 _LIBCPP_BEGIN_NAMESPACE_STD
  29
  30 namespace ranges {
  31
  32 template <class _Ip, class _Op>
  33 using copy_backward_result = in_out_result<_Ip, _Op>;
  34
  35 namespace __copy_backward {
  36 struct __fn {
  37   template <bidirectional_iterator _InIter1, sentinel_for<_InIter1> _Sent1, bidirectional_iterator _InIter2>
  38     requires indirectly_copyable<_InIter1, _InIter2>
  39   _LIBCPP_HIDE_FROM_ABI constexpr copy_backward_result<_InIter1, _InIter2>
  40   operator()(_InIter1 __first, _Sent1 __last, _InIter2 __result) const {
  41     auto __ret = std::__copy_backward<_RangeAlgPolicy>(std::move(__first), std::move(__last), std::move(__result));
  42     return {std::move(__ret.first), std::move(__ret.second)};
  43   }
  44
  45   template <bidirectional_range _Range, bidirectional_iterator _Iter>
  46     requires indirectly_copyable<iterator_t<_Range>, _Iter>
  47   _LIBCPP_HIDE_FROM_ABI constexpr copy_backward_result<borrowed_iterator_t<_Range>, _Iter>
  48   operator()(_Range&& __r, _Iter __result) const {
  49     auto __ret = std::__copy_backward<_RangeAlgPolicy>(ranges::begin(__r), ranges::end(__r), std::move(__result));
  50     return {std::move(__ret.first), std::move(__ret.second)};
  51   }
  52 };
  53 } // namespace __copy_backward
  54
  55 inline namespace __cpo {
  56 inline constexpr auto copy_backward = __copy_backward::__fn{};
  57 } // namespace __cpo
  58 } // namespace ranges
  59
  60 _LIBCPP_END_NAMESPACE_STD
  61
  62 #endif // _LIBCPP_STD_VER >= 20
  63
  64 #endif // _LIBCPP___ALGORITHM_RANGES_COPY_BACKWARD_H