d10dc5a06f
We originally put implementation-detail function objects into individual namespaces for `std::ranges` without a good reason for doing so. This practice was continued, presumably because there was prior art. Since there's no reason to keep these namespaces, this commit removes them, which will slightly impact binary size. This commit does not apply to CPOs, some of which need additional work.
80 lines
2.4 KiB
C++
80 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/iterator_operations.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_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20
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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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struct __copy_n {
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template <class _InIter, class _DiffType, class _OutIter>
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_LIBCPP_HIDE_FROM_ABI constexpr static copy_n_result<_InIter, _OutIter>
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__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 copy_n_result<_InIter, _OutIter>
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__go(_InIter __first, _DiffType __n, _OutIter __result) {
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auto __ret = std::__copy<_RangeAlgPolicy>(__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 copy_n_result<_Ip, _Op>
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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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inline namespace __cpo {
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inline constexpr auto copy_n = __copy_n{};
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} // namespace __cpo
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} // namespace ranges
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___ALGORITHM_RANGES_COPY_N_H
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