forked from OSchip/llvm-project
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ALGORITHM_RANGES_COPY_N_H
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#define _LIBCPP___ALGORITHM_RANGES_COPY_N_H
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#include <__algorithm/copy.h>
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#include <__algorithm/in_out_result.h>
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#include <__algorithm/ranges_copy.h>
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#include <__config>
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#include <__functional/identity.h>
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#include <__iterator/concepts.h>
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#include <__iterator/incrementable_traits.h>
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#include <__iterator/unreachable_sentinel.h>
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#include <__iterator/wrap_iter.h>
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#include <__utility/move.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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namespace ranges {
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template <class _Ip, class _Op>
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using copy_n_result = in_out_result<_Ip, _Op>;
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namespace __copy_n {
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struct __fn {
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template <class _InIter, class _DiffType, class _OutIter>
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_LIBCPP_HIDE_FROM_ABI constexpr static
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copy_n_result<_InIter, _OutIter> __go(_InIter __first, _DiffType __n, _OutIter __result) {
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while (__n != 0) {
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*__result = *__first;
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++__first;
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++__result;
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--__n;
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}
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return {std::move(__first), std::move(__result)};
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}
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template <random_access_iterator _InIter, class _DiffType, random_access_iterator _OutIter>
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_LIBCPP_HIDE_FROM_ABI constexpr static
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copy_n_result<_InIter, _OutIter> __go(_InIter __first, _DiffType __n, _OutIter __result) {
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auto __ret = std::__copy(__first, __first + __n, __result);
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return {__ret.first, __ret.second};
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}
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template <input_iterator _Ip, weakly_incrementable _Op>
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requires indirectly_copyable<_Ip, _Op>
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_LIBCPP_HIDE_FROM_ABI constexpr
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copy_n_result<_Ip, _Op> operator()(_Ip __first, iter_difference_t<_Ip> __n, _Op __result) const {
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return __go(std::move(__first), __n, std::move(__result));
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}
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};
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} // namespace __copy_n
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inline namespace __cpo {
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inline constexpr auto copy_n = __copy_n::__fn{};
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} // namespace __cpo
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} // namespace ranges
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#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_RANGES_COPY_N_H
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