| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___ALGORITHM_COPY_H |
| #define _LIBCPP___ALGORITHM_COPY_H |
| |
| #include <__algorithm/unwrap_iter.h> |
| #include <__algorithm/unwrap_range.h> |
| #include <__config> |
| #include <__iterator/iterator_traits.h> |
| #include <__iterator/reverse_iterator.h> |
| #include <__utility/move.h> |
| #include <__utility/pair.h> |
| #include <cstring> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| // copy |
| |
| template <class _InIter, class _Sent, class _OutIter> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| pair<_InIter, _OutIter> __copy_impl(_InIter __first, _Sent __last, _OutIter __result) { |
| while (__first != __last) { |
| *__result = *__first; |
| ++__first; |
| ++__result; |
| } |
| return pair<_InIter, _OutIter>(std::move(__first), std::move(__result)); |
| } |
| |
| template <class _InValueT, |
| class _OutValueT, |
| class = __enable_if_t<is_same<__remove_const_t<_InValueT>, _OutValueT>::value |
| && is_trivially_copy_assignable<_OutValueT>::value> > |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| pair<_InValueT*, _OutValueT*> __copy_impl(_InValueT* __first, _InValueT* __last, _OutValueT* __result) { |
| if (__libcpp_is_constant_evaluated() |
| // TODO: Remove this once GCC supports __builtin_memmove during constant evaluation |
| #ifndef _LIBCPP_COMPILER_GCC |
| && !is_trivially_copyable<_InValueT>::value |
| #endif |
| ) |
| return std::__copy_impl<_InValueT*, _InValueT*, _OutValueT*>(__first, __last, __result); |
| const size_t __n = static_cast<size_t>(__last - __first); |
| if (__n > 0) |
| ::__builtin_memmove(__result, __first, __n * sizeof(_OutValueT)); |
| return std::make_pair(__first + __n, __result + __n); |
| } |
| |
| template <class _InIter, class _OutIter, |
| __enable_if_t<is_same<__remove_const_t<__iter_value_type<_InIter> >, __iter_value_type<_OutIter> >::value |
| && __is_cpp17_contiguous_iterator<typename _InIter::iterator_type>::value |
| && __is_cpp17_contiguous_iterator<typename _OutIter::iterator_type>::value |
| && is_trivially_copy_assignable<__iter_value_type<_OutIter> >::value |
| && __is_reverse_iterator<_InIter>::value |
| && __is_reverse_iterator<_OutIter>::value, int> = 0> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| pair<_InIter, _OutIter> |
| __copy_impl(_InIter __first, _InIter __last, _OutIter __result) { |
| auto __first_base = std::__unwrap_iter(__first.base()); |
| auto __last_base = std::__unwrap_iter(__last.base()); |
| auto __result_base = std::__unwrap_iter(__result.base()); |
| auto __result_first = __result_base - (__first_base - __last_base); |
| std::__copy_impl(__last_base, __first_base, __result_first); |
| return std::make_pair(__last, _OutIter(std::__rewrap_iter(__result.base(), __result_first))); |
| } |
| |
| template <class _InIter, class _Sent, class _OutIter, |
| __enable_if_t<!(is_copy_constructible<_InIter>::value |
| && is_copy_constructible<_Sent>::value |
| && is_copy_constructible<_OutIter>::value), int> = 0 > |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| pair<_InIter, _OutIter> __copy(_InIter __first, _Sent __last, _OutIter __result) { |
| return std::__copy_impl(std::move(__first), std::move(__last), std::move(__result)); |
| } |
| |
| template <class _InIter, class _Sent, class _OutIter, |
| __enable_if_t<is_copy_constructible<_InIter>::value |
| && is_copy_constructible<_Sent>::value |
| && is_copy_constructible<_OutIter>::value, int> = 0> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| pair<_InIter, _OutIter> __copy(_InIter __first, _Sent __last, _OutIter __result) { |
| auto __range = std::__unwrap_range(__first, __last); |
| auto __ret = std::__copy_impl(std::move(__range.first), std::move(__range.second), std::__unwrap_iter(__result)); |
| return std::make_pair( |
| std::__rewrap_range<_Sent>(__first, __ret.first), std::__rewrap_iter(__result, __ret.second)); |
| } |
| |
| template <class _InputIterator, class _OutputIterator> |
| inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 |
| _OutputIterator |
| copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) { |
| return std::__copy(__first, __last, __result).second; |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___ALGORITHM_COPY_H |