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_N_H
10#define _LIBCPP___ALGORITHM_RANGES_COPY_N_H
11
12#include <__algorithm/copy_n.h>
13#include <__algorithm/in_out_result.h>
14#include <__algorithm/iterator_operations.h>
15#include <__config>
16#include <__iterator/concepts.h>
17#include <__iterator/incrementable_traits.h>
18#include <__utility/move.h>
19
20#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
21# pragma GCC system_header
22#endif
23
24_LIBCPP_PUSH_MACROS
25#include <__undef_macros>
26
27_LIBCPP_BEGIN_NAMESPACE_STD
28
29#if _LIBCPP_STD_VER >= 20
30
31namespace ranges {
32
33template <class _Ip, class _Op>
34using copy_n_result = in_out_result<_Ip, _Op>;
35
36struct __copy_n {
37 template <input_iterator _Ip, weakly_incrementable _Op>
38 requires indirectly_copyable<_Ip, _Op>
39 _LIBCPP_HIDE_FROM_ABI constexpr copy_n_result<_Ip, _Op>
40 operator()(_Ip __first, iter_difference_t<_Ip> __n, _Op __result) const {
41 auto __res = std::__copy_n<_RangeAlgPolicy>(std::move(__first), __n, std::move(__result));
42 return {std::move(__res.first), std::move(__res.second)};
43 }
44};
45
46inline namespace __cpo {
47inline constexpr auto copy_n = __copy_n{};
48} // namespace __cpo
49} // namespace ranges
50
51#endif // _LIBCPP_STD_VER >= 20
52
53_LIBCPP_END_NAMESPACE_STD
54
55_LIBCPP_POP_MACROS
56
57#endif // _LIBCPP___ALGORITHM_RANGES_COPY_N_H
58