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| 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___CXX03___ALGORITHM_COPY_N_H |
| 10 | #define _LIBCPP___CXX03___ALGORITHM_COPY_N_H |
| 11 | |
| 12 | #include <__cxx03/__algorithm/copy.h> |
| 13 | #include <__cxx03/__config> |
| 14 | #include <__cxx03/__iterator/iterator_traits.h> |
| 15 | #include <__cxx03/__type_traits/enable_if.h> |
| 16 | #include <__cxx03/__utility/convert_to_integral.h> |
| 17 | |
| 18 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 19 | # pragma GCC system_header |
| 20 | #endif |
| 21 | |
| 22 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 23 | |
| 24 | template <class _InputIterator, |
| 25 | class _Size, |
| 26 | class _OutputIterator, |
| 27 | __enable_if_t<__has_input_iterator_category<_InputIterator>::value && |
| 28 | !__has_random_access_iterator_category<_InputIterator>::value, |
| 29 | int> = 0> |
| 30 | inline _LIBCPP_HIDE_FROM_ABI _OutputIterator copy_n(_InputIterator __first, _Size __orig_n, _OutputIterator __result) { |
| 31 | typedef decltype(std::__convert_to_integral(__orig_n)) _IntegralSize; |
| 32 | _IntegralSize __n = __orig_n; |
| 33 | if (__n > 0) { |
| 34 | *__result = *__first; |
| 35 | ++__result; |
| 36 | for (--__n; __n > 0; --__n) { |
| 37 | ++__first; |
| 38 | *__result = *__first; |
| 39 | ++__result; |
| 40 | } |
| 41 | } |
| 42 | return __result; |
| 43 | } |
| 44 | |
| 45 | template <class _InputIterator, |
| 46 | class _Size, |
| 47 | class _OutputIterator, |
| 48 | __enable_if_t<__has_random_access_iterator_category<_InputIterator>::value, int> = 0> |
| 49 | inline _LIBCPP_HIDE_FROM_ABI _OutputIterator copy_n(_InputIterator __first, _Size __orig_n, _OutputIterator __result) { |
| 50 | typedef typename iterator_traits<_InputIterator>::difference_type difference_type; |
| 51 | typedef decltype(std::__convert_to_integral(__orig_n)) _IntegralSize; |
| 52 | _IntegralSize __n = __orig_n; |
| 53 | return std::copy(__first, __first + difference_type(__n), __result); |
| 54 | } |
| 55 | |
| 56 | _LIBCPP_END_NAMESPACE_STD |
| 57 | |
| 58 | #endif // _LIBCPP___CXX03___ALGORITHM_COPY_N_H |
| 59 |
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