5aaefa510e
libc++ has started splicing standard library headers into much more fine-grained content for maintainability. It's very likely that outdated and naive tooling (some of which is outside of LLVM's scope) will suggest users include things such as <__ranges/access.h> instead of <ranges>, and Hyrum's law suggests that users will eventually begin to rely on this without the help of tooling. As such, this commit intends to protect users from themselves, by making it a hard error for anyone outside of the standard library to include libc++ detail headers. Differential Revision: https://reviews.llvm.org/D106124
68 lines
2.0 KiB
C++
68 lines
2.0 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_COPY_N_H
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#define _LIBCPP___ALGORITHM_COPY_N_H
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#include <__algorithm/copy.h>
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#include <__config>
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#include <__iterator/iterator_traits.h>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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# pragma clang include_instead(<algorithm>)
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template<class _InputIterator, class _Size, class _OutputIterator>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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typename enable_if
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<
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__is_cpp17_input_iterator<_InputIterator>::value &&
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!__is_cpp17_random_access_iterator<_InputIterator>::value,
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_OutputIterator
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>::type
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copy_n(_InputIterator __first, _Size __orig_n, _OutputIterator __result)
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{
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typedef decltype(_VSTD::__convert_to_integral(__orig_n)) _IntegralSize;
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_IntegralSize __n = __orig_n;
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if (__n > 0)
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{
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*__result = *__first;
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++__result;
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for (--__n; __n > 0; --__n)
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{
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++__first;
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*__result = *__first;
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++__result;
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}
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}
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return __result;
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}
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template<class _InputIterator, class _Size, class _OutputIterator>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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typename enable_if
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<
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__is_cpp17_random_access_iterator<_InputIterator>::value,
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_OutputIterator
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>::type
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copy_n(_InputIterator __first, _Size __orig_n, _OutputIterator __result)
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{
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typedef typename iterator_traits<_InputIterator>::difference_type difference_type;
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typedef decltype(_VSTD::__convert_to_integral(__orig_n)) _IntegralSize;
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_IntegralSize __n = __orig_n;
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return _VSTD::copy(__first, __first + difference_type(__n), __result);
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_COPY_N_H
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