__cxx03/__algorithm/ranges_reverse_copy.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_REVERSE_COPY_H
0010 #define _LIBCPP___CXX03___ALGORITHM_RANGES_REVERSE_COPY_H
0011
0012 #include <__cxx03/__algorithm/in_out_result.h>
0013 #include <__cxx03/__algorithm/ranges_copy.h>
0014 #include <__cxx03/__config>
0015 #include <__cxx03/__iterator/concepts.h>
0016 #include <__cxx03/__iterator/next.h>
0017 #include <__cxx03/__iterator/reverse_iterator.h>
0018 #include <__cxx03/__ranges/access.h>
0019 #include <__cxx03/__ranges/concepts.h>
0020 #include <__cxx03/__ranges/dangling.h>
0021 #include <__cxx03/__ranges/subrange.h>
0022 #include <__cxx03/__utility/move.h>
0023
0024 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0025 #  pragma GCC system_header
0026 #endif
0027
0028 _LIBCPP_PUSH_MACROS
0029 #include <__cxx03/__undef_macros>
0030
0031 #if _LIBCPP_STD_VER >= 20
0032
0033 _LIBCPP_BEGIN_NAMESPACE_STD
0034
0035 namespace ranges {
0036
0037 template <class _InIter, class _OutIter>
0038 using reverse_copy_result = in_out_result<_InIter, _OutIter>;
0039
0040 namespace __reverse_copy {
0041 struct __fn {
0042   template <bidirectional_iterator _InIter, sentinel_for<_InIter> _Sent, weakly_incrementable _OutIter>
0043     requires indirectly_copyable<_InIter, _OutIter>
0044   _LIBCPP_HIDE_FROM_ABI constexpr reverse_copy_result<_InIter, _OutIter>
0045   operator()(_InIter __first, _Sent __last, _OutIter __result) const {
0046     return (*this)(subrange(std::move(__first), std::move(__last)), std::move(__result));
0047   }
0048
0049   template <bidirectional_range _Range, weakly_incrementable _OutIter>
0050     requires indirectly_copyable<iterator_t<_Range>, _OutIter>
0051   _LIBCPP_HIDE_FROM_ABI constexpr reverse_copy_result<borrowed_iterator_t<_Range>, _OutIter>
0052   operator()(_Range&& __range, _OutIter __result) const {
0053     auto __ret = ranges::copy(std::__reverse_range(__range), std::move(__result));
0054     return {ranges::next(ranges::begin(__range), ranges::end(__range)), std::move(__ret.out)};
0055   }
0056 };
0057 } // namespace __reverse_copy
0058
0059 inline namespace __cpo {
0060 inline constexpr auto reverse_copy = __reverse_copy::__fn{};
0061 } // namespace __cpo
0062 } // namespace ranges
0063
0064 _LIBCPP_END_NAMESPACE_STD
0065
0066 #endif // _LIBCPP_STD_VER >= 20
0067
0068 _LIBCPP_POP_MACROS
0069
0070 #endif // _LIBCPP___CXX03___ALGORITHM_RANGES_REVERSE_COPY_H