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80643d9366
We plan to add concepts for checking that iterators actually provide what they claim to. This is to avoid people thinking that these type traits actually check the iterator requirements in more detail. Reviewed By: ldionne, #libc Spies: Mordante, libcxx-commits, wenlei Differential Revision: https://reviews.llvm.org/D150801
68 lines
2.1 KiB
C++
68 lines
2.1 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/enable_if.h>
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#include <__utility/convert_to_integral.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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template<class _InputIterator, class _Size, class _OutputIterator>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
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typename enable_if
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<
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__has_input_iterator_category<_InputIterator>::value &&
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!__has_random_access_iterator_category<_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_SINCE_CXX20
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typename enable_if
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<
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__has_random_access_iterator_category<_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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