__cxx03/__algorithm/ranges_copy_backward.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___CXX03___ALGORITHM_RANGES_COPY_BACKWARD_H
0010 #define _LIBCPP___CXX03___ALGORITHM_RANGES_COPY_BACKWARD_H
0011
0012 #include <__cxx03/__algorithm/copy_backward.h>
0013 #include <__cxx03/__algorithm/in_out_result.h>
0014 #include <__cxx03/__algorithm/iterator_operations.h>
0015 #include <__cxx03/__config>
0016 #include <__cxx03/__iterator/concepts.h>
0017 #include <__cxx03/__ranges/access.h>
0018 #include <__cxx03/__ranges/concepts.h>
0019 #include <__cxx03/__ranges/dangling.h>
0020 #include <__cxx03/__utility/move.h>
0021
0022 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0023 #  pragma GCC system_header
0024 #endif
0025
0026 _LIBCPP_PUSH_MACROS
0027 #include <__cxx03/__undef_macros>
0028
0029 #if _LIBCPP_STD_VER >= 20
0030
0031 _LIBCPP_BEGIN_NAMESPACE_STD
0032
0033 namespace ranges {
0034
0035 template <class _Ip, class _Op>
0036 using copy_backward_result = in_out_result<_Ip, _Op>;
0037
0038 namespace __copy_backward {
0039 struct __fn {
0040   template <bidirectional_iterator _InIter1, sentinel_for<_InIter1> _Sent1, bidirectional_iterator _InIter2>
0041     requires indirectly_copyable<_InIter1, _InIter2>
0042   _LIBCPP_HIDE_FROM_ABI constexpr copy_backward_result<_InIter1, _InIter2>
0043   operator()(_InIter1 __first, _Sent1 __last, _InIter2 __result) const {
0044     auto __ret = std::__copy_backward<_RangeAlgPolicy>(std::move(__first), std::move(__last), std::move(__result));
0045     return {std::move(__ret.first), std::move(__ret.second)};
0046   }
0047
0048   template <bidirectional_range _Range, bidirectional_iterator _Iter>
0049     requires indirectly_copyable<iterator_t<_Range>, _Iter>
0050   _LIBCPP_HIDE_FROM_ABI constexpr copy_backward_result<borrowed_iterator_t<_Range>, _Iter>
0051   operator()(_Range&& __r, _Iter __result) const {
0052     auto __ret = std::__copy_backward<_RangeAlgPolicy>(ranges::begin(__r), ranges::end(__r), std::move(__result));
0053     return {std::move(__ret.first), std::move(__ret.second)};
0054   }
0055 };
0056 } // namespace __copy_backward
0057
0058 inline namespace __cpo {
0059 inline constexpr auto copy_backward = __copy_backward::__fn{};
0060 } // namespace __cpo
0061 } // namespace ranges
0062
0063 _LIBCPP_END_NAMESPACE_STD
0064
0065 #endif // _LIBCPP_STD_VER >= 20
0066
0067 _LIBCPP_POP_MACROS
0068
0069 #endif // _LIBCPP___CXX03___ALGORITHM_RANGES_COPY_BACKWARD_H