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___ALGORITHM_COPY_H 10 #define _LIBCPP___ALGORITHM_COPY_H 11 12 #include <__algorithm/copy_move_common.h> 13 #include <__algorithm/iterator_operations.h> 14 #include <__config> 15 #include <__utility/move.h> 16 #include <__utility/pair.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 struct __copy_loop { 25 template <class _InIter, class _Sent, class _OutIter> 26 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> 27 operator()(_InIter __first, _Sent __last, _OutIter __result) const { 28 while (__first != __last) { 29 *__result = *__first; 30 ++__first; 31 ++__result; 32 } 33 34 return std::make_pair(std::move(__first), std::move(__result)); 35 } 36 }; 37 38 struct __copy_trivial { 39 // At this point, the iterators have been unwrapped so any `contiguous_iterator` has been unwrapped to a pointer. 40 template <class _In, class _Out, __enable_if_t< is_trivially_assignable<_Out&, _In&>::value, int > = 0> 41 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_In*, _Out*> 42 operator()(_In* __first, _In* __last, _Out* __result) const { 43 return std::__copy_trivial_impl(__first, __last, __result); 44 } 45 }; 46 47 template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter> 48 pair<_InIter, _OutIter> 49 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 50 __copy(_InIter __first, _Sent __last, _OutIter __result) { 51 return std::__dispatch_copy_or_move<_AlgPolicy, __copy_loop, __copy_trivial>( 52 std::move(__first), std::move(__last), std::move(__result)); 53 } 54 55 template <class _InputIterator, class _OutputIterator> 56 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 57 _OutputIterator 58 copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) { 59 return std::__copy<_ClassicAlgPolicy>(__first, __last, __result).second; 60 } 61 62 _LIBCPP_END_NAMESPACE_STD 63 64 #endif // _LIBCPP___ALGORITHM_COPY_H 65