v1/__algorithm/ranges_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___ALGORITHM_RANGES_COPY_H
0010 #define _LIBCPP___ALGORITHM_RANGES_COPY_H
0011
0012 #include <__algorithm/copy.h>
0013 #include <__algorithm/in_out_result.h>
0014 #include <__config>
0015 #include <__functional/identity.h>
0016 #include <__iterator/concepts.h>
0017 #include <__ranges/access.h>
0018 #include <__ranges/concepts.h>
0019 #include <__ranges/dangling.h>
0020 #include <__utility/move.h>
0021 #include <__utility/pair.h>
0022
0023 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0024 #  pragma GCC system_header
0025 #endif
0026
0027 _LIBCPP_PUSH_MACROS
0028 #include <__undef_macros>
0029
0030 #if _LIBCPP_STD_VER >= 20
0031
0032 _LIBCPP_BEGIN_NAMESPACE_STD
0033
0034 namespace ranges {
0035
0036 template <class _InIter, class _OutIter>
0037 using copy_result = in_out_result<_InIter, _OutIter>;
0038
0039 struct __copy {
0040   template <input_iterator _InIter, sentinel_for<_InIter> _Sent, weakly_incrementable _OutIter>
0041     requires indirectly_copyable<_InIter, _OutIter>
0042   _LIBCPP_HIDE_FROM_ABI constexpr copy_result<_InIter, _OutIter>
0043   operator()(_InIter __first, _Sent __last, _OutIter __result) const {
0044     auto __ret = std::__copy(std::move(__first), std::move(__last), std::move(__result));
0045     return {std::move(__ret.first), std::move(__ret.second)};
0046   }
0047
0048   template <input_range _Range, weakly_incrementable _OutIter>
0049     requires indirectly_copyable<iterator_t<_Range>, _OutIter>
0050   _LIBCPP_HIDE_FROM_ABI constexpr copy_result<borrowed_iterator_t<_Range>, _OutIter>
0051   operator()(_Range&& __r, _OutIter __result) const {
0052     auto __ret = std::__copy(ranges::begin(__r), ranges::end(__r), std::move(__result));
0053     return {std::move(__ret.first), std::move(__ret.second)};
0054   }
0055 };
0056
0057 inline namespace __cpo {
0058 inline constexpr auto copy = __copy{};
0059 } // namespace __cpo
0060 } // namespace ranges
0061
0062 _LIBCPP_END_NAMESPACE_STD
0063
0064 #endif // _LIBCPP_STD_VER >= 20
0065
0066 _LIBCPP_POP_MACROS
0067
0068 #endif // _LIBCPP___ALGORITHM_RANGES_COPY_H