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_MOVE_H 10 #define _LIBCPP___ALGORITHM_MOVE_H 11 12 #include <__config> 13 #include <__algorithm/unwrap_iter.h> 14 #include <__utility/move.h> 15 #include <cstring> 16 #include <utility> 17 #include <type_traits> 18 19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 20 #pragma GCC system_header 21 #endif 22 23 _LIBCPP_BEGIN_NAMESPACE_STD 24 25 // move 26 27 template <class _InputIterator, class _OutputIterator> 28 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 29 _OutputIterator 30 __move_constexpr(_InputIterator __first, _InputIterator __last, _OutputIterator __result) 31 { 32 for (; __first != __last; ++__first, (void) ++__result) 33 *__result = _VSTD::move(*__first); 34 return __result; 35 } 36 37 template <class _InputIterator, class _OutputIterator> 38 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 39 _OutputIterator 40 __move(_InputIterator __first, _InputIterator __last, _OutputIterator __result) 41 { 42 return _VSTD::__move_constexpr(__first, __last, __result); 43 } 44 45 template <class _Tp, class _Up> 46 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 47 typename enable_if 48 < 49 is_same<typename remove_const<_Tp>::type, _Up>::value && 50 is_trivially_move_assignable<_Up>::value, 51 _Up* 52 >::type 53 __move(_Tp* __first, _Tp* __last, _Up* __result) 54 { 55 const size_t __n = static_cast<size_t>(__last - __first); 56 if (__n > 0) 57 _VSTD::memmove(__result, __first, __n * sizeof(_Up)); 58 return __result + __n; 59 } 60 61 template <class _InputIterator, class _OutputIterator> 62 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 63 _OutputIterator 64 move(_InputIterator __first, _InputIterator __last, _OutputIterator __result) 65 { 66 if (__libcpp_is_constant_evaluated()) { 67 return _VSTD::__move_constexpr(__first, __last, __result); 68 } else { 69 return _VSTD::__rewrap_iter(__result, 70 _VSTD::__move(_VSTD::__unwrap_iter(__first), 71 _VSTD::__unwrap_iter(__last), 72 _VSTD::__unwrap_iter(__result))); 73 } 74 } 75 76 _LIBCPP_END_NAMESPACE_STD 77 78 #endif // _LIBCPP___ALGORITHM_MOVE_H 79