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libcxx/include/__algorithm/move.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_MOVE_H #ifndef _LIBCPP___ALGORITHM_MOVE_H
#define _LIBCPP___ALGORITHM_MOVE_H #define _LIBCPP___ALGORITHM_MOVE_H
#include <__algorithm/copy_move_common.h>
#include <__algorithm/iterator_operations.h> #include <__algorithm/iterator_operations.h>
#include <__algorithm/unwrap_iter.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
// move template <class _AlgPolicy>
struct __move_loop {
template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter> template <class _InIter, class _Sent, class _OutIter>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
pair<_InIter, _OutIter> __move_impl(_InIter __first, _Sent __last, _OutIter __result) { operator()(_InIter __first, _Sent __last, _OutIter __result) const {
while (__first != __last) { while (__first != __last) {
*__result = _IterOps<_AlgPolicy>::__iter_move(__first); *__result = _IterOps<_AlgPolicy>::__iter_move(__first);
++__first; ++__first;
++__result; ++__result;
} }
return std::make_pair(std::move(__first), std::move(__result)); return std::make_pair(std::move(__first), std::move(__result));
} }
};
template <class _AlgPolicy, struct __move_trivial {
class _InType, // At this point, the iterators have been unwrapped so any `contiguous_iterator` has been unwrapped to a pointer.
class _OutType, template <class _In, class _Out, __enable_if_memmovable<_In&&, _Out&> = 0>
class = __enable_if_t<is_same<__remove_const_t<_InType>, _OutType>::value _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_In*, _Out*>
&& is_trivially_move_assignable<_OutType>::value> > operator()(_In* __first, _In* __last, _Out* __result) const {
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 return std::__copy_trivial_impl(__first, __last, __result);
pair<_InType*, _OutType*> __move_impl(_InType* __first, _InType* __last, _OutType* __result) {
if (__libcpp_is_constant_evaluated()
// TODO: Remove this once GCC supports __builtin_memmove during constant evaluation
#ifndef _LIBCPP_COMPILER_GCC
&& !is_trivially_copyable<_InType>::value
#endif
)
return std::__move_impl<_AlgPolicy, _InType*, _InType*, _OutType*>(__first, __last, __result);
const size_t __n = static_cast<size_t>(__last - __first);
::__builtin_memmove(__result, __first, __n * sizeof(_OutType));
return std::make_pair(__first + __n, __result + __n);
}
template <class>
struct __is_trivially_move_assignable_unwrapped_impl : false_type {};
template <class _Type>
struct __is_trivially_move_assignable_unwrapped_impl<_Type*> : is_trivially_move_assignable<_Type> {};
template <class _Iter>
struct __is_trivially_move_assignable_unwrapped
: __is_trivially_move_assignable_unwrapped_impl<decltype(std::__unwrap_iter<_Iter>(std::declval<_Iter>()))> {};
template <class _AlgPolicy,
class _InIter,
class _OutIter,
__enable_if_t<is_same<__remove_const_t<typename iterator_traits<_InIter>::value_type>,
typename iterator_traits<_OutIter>::value_type>::value
&& __is_cpp17_contiguous_iterator<_InIter>::value
&& __is_cpp17_contiguous_iterator<_OutIter>::value
&& is_trivially_move_assignable<__iter_value_type<_OutIter> >::value, int> = 0>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17
pair<reverse_iterator<_InIter>, reverse_iterator<_OutIter> >
__move_impl(reverse_iterator<_InIter> __first,
reverse_iterator<_InIter> __last,
reverse_iterator<_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::__move_impl<_AlgPolicy>(__last_base, __first_base, __result_first);
return std::make_pair(__last, reverse_iterator<_OutIter>(std::__rewrap_iter(__result.base(), __result_first)));
}
template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
__enable_if_t<is_copy_constructible<_InIter>::value
&& is_copy_constructible<_Sent>::value
&& is_copy_constructible<_OutIter>::value, pair<_InIter, _OutIter> >
__move(_InIter __first, _Sent __last, _OutIter __result) {
auto __ret = std::__move_impl<_AlgPolicy>(
std::__unwrap_iter(__first), std::__unwrap_iter(__last), std::__unwrap_iter(__result));
return std::make_pair(std::__rewrap_iter(__first, __ret.first), std::__rewrap_iter(__result, __ret.second));
} }
};
template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter> template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14
__enable_if_t<!is_copy_constructible<_InIter>::value pair<_InIter, _OutIter>
|| !is_copy_constructible<_Sent>::value
|| !is_copy_constructible<_OutIter>::value, pair<_InIter, _OutIter> >
__move(_InIter __first, _Sent __last, _OutIter __result) { __move(_InIter __first, _Sent __last, _OutIter __result) {
return std::__move_impl<_AlgPolicy>(std::move(__first), std::move(__last), std::move(__result)); return std::__dispatch_copy_or_move<_AlgPolicy, __move_loop<_AlgPolicy>, __move_trivial>(
std::move(__first), std::move(__last), std::move(__result));
} }
template <class _InputIterator, class _OutputIterator> template <class _InputIterator, class _OutputIterator>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
_OutputIterator move(_InputIterator __first, _InputIterator __last, _OutputIterator __result) { _OutputIterator move(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {
return std::__move<_ClassicAlgPolicy>(__first, __last, __result).second; static_assert(is_copy_constructible<_InputIterator>::value, "Iterators has to be copy constructible.");
static_assert(is_copy_constructible<_OutputIterator>::value, "The output iterator has to be copy constructible.");
return std::__move<_ClassicAlgPolicy>(
std::move(__first), std::move(__last), std::move(__result)).second;
} }
_LIBCPP_END_NAMESPACE_STD _LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ALGORITHM_MOVE_H #endif // _LIBCPP___ALGORITHM_MOVE_H