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libcxx/include/__algorithm/copy.h

//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
// //
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information. // See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// //
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ALGORITHM_COPY_H #ifndef _LIBCPP___ALGORITHM_COPY_H
#define _LIBCPP___ALGORITHM_COPY_H #define _LIBCPP___ALGORITHM_COPY_H
#include <__algorithm/unwrap_iter.h> #include <__algorithm/copy_move_common.h>
#include <__algorithm/unwrap_range.h> #include <__algorithm/iterator_operations.h>
#include <__config> #include <__config>
#include <__iterator/iterator_traits.h>
#include <__iterator/reverse_iterator.h>
#include <__utility/move.h> #include <__utility/move.h>
#include <__utility/pair.h> #include <__utility/pair.h>
#include <cstring>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header # pragma GCC system_header
#endif #endif
_LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_BEGIN_NAMESPACE_STD
// copy struct __copy_loop {
template <class _InIter, class _Sent, class _OutIter> template <class _InIter, class _Sent, class _OutIter>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
pair<_InIter, _OutIter> __copy_impl(_InIter __first, _Sent __last, _OutIter __result) { operator()(_InIter __first, _Sent __last, _OutIter __result) const {
while (__first != __last) { while (__first != __last) {
*__result = *__first; *__result = *__first;
++__first; ++__first;
++__result; ++__result;
} }
return pair<_InIter, _OutIter>(std::move(__first), std::move(__result));
}
template <class _InValueT, return std::make_pair(std::move(__first), std::move(__result));
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, struct __copy_trivial {
__enable_if_t<is_same<__remove_const_t<__iter_value_type<_InIter> >, __iter_value_type<_OutIter> >::value // At this point, the iterators have been unwrapped so any `contiguous_iterator` has been unwrapped to a pointer.
&& __is_cpp17_contiguous_iterator<typename _InIter::iterator_type>::value template <class _In, class _Out, __enable_if_memmovable<_In&, _Out&> = 0>
&& __is_cpp17_contiguous_iterator<typename _OutIter::iterator_type>::value _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_In*, _Out*>
&& is_trivially_copy_assignable<__iter_value_type<_OutIter> >::value operator()(_In* __first, _In* __last, _Out* __result) const {
&& __is_reverse_iterator<_InIter>::value return std::__copy_trivial_impl(__first, __last, __result);
&& __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, template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>
__enable_if_t<!(is_copy_constructible<_InIter>::value pair<_InIter, _OutIter>
&& 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 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
pair<_InIter, _OutIter> __copy(_InIter __first, _Sent __last, _OutIter __result) { __copy(_InIter __first, _Sent __last, _OutIter __result) {
auto __range = std::__unwrap_range(__first, __last); return std::__dispatch_copy_or_move<_AlgPolicy, __copy_loop, __copy_trivial>(
auto __ret = std::__copy_impl(std::move(__range.first), std::move(__range.second), std::__unwrap_iter(__result)); std::move(__first), std::move(__last), std::move(__result));
return std::make_pair(
std::__rewrap_range<_Sent>(__first, __ret.first), std::__rewrap_iter(__result, __ret.second));
} }
template <class _InputIterator, class _OutputIterator> template <class _InputIterator, class _OutputIterator>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
_OutputIterator _OutputIterator
copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) { copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {
return std::__copy(__first, __last, __result).second; return std::__copy<_ClassicAlgPolicy>(__first, __last, __result).second;
} }
_LIBCPP_END_NAMESPACE_STD _LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ALGORITHM_COPY_H #endif // _LIBCPP___ALGORITHM_COPY_H