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 <__config> 13 #include <__algorithm/unwrap_iter.h> 14 #include <__iterator/iterator_traits.h> 15 #include <cstring> 16 #include <type_traits> 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 #pragma GCC system_header 20 #endif 21 22 _LIBCPP_PUSH_MACROS 23 #include <__undef_macros> 24 25 _LIBCPP_BEGIN_NAMESPACE_STD 26 27 // copy 28 29 template <class _InputIterator, class _OutputIterator> 30 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 31 _OutputIterator 32 __copy_constexpr(_InputIterator __first, _InputIterator __last, _OutputIterator __result) 33 { 34 for (; __first != __last; ++__first, (void) ++__result) 35 *__result = *__first; 36 return __result; 37 } 38 39 template <class _InputIterator, class _OutputIterator> 40 inline _LIBCPP_INLINE_VISIBILITY 41 _OutputIterator 42 __copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) 43 { 44 return _VSTD::__copy_constexpr(__first, __last, __result); 45 } 46 47 template <class _Tp, class _Up> 48 inline _LIBCPP_INLINE_VISIBILITY 49 typename enable_if 50 < 51 is_same<typename remove_const<_Tp>::type, _Up>::value && 52 is_trivially_copy_assignable<_Up>::value, 53 _Up* 54 >::type 55 __copy(_Tp* __first, _Tp* __last, _Up* __result) 56 { 57 const size_t __n = static_cast<size_t>(__last - __first); 58 if (__n > 0) 59 _VSTD::memmove(__result, __first, __n * sizeof(_Up)); 60 return __result + __n; 61 } 62 63 template <class _InputIterator, class _OutputIterator> 64 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 65 _OutputIterator 66 copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) 67 { 68 if (__libcpp_is_constant_evaluated()) { 69 return _VSTD::__copy_constexpr(__first, __last, __result); 70 } else { 71 return _VSTD::__rewrap_iter(__result, 72 _VSTD::__copy(_VSTD::__unwrap_iter(__first), 73 _VSTD::__unwrap_iter(__last), 74 _VSTD::__unwrap_iter(__result))); 75 } 76 } 77 78 _LIBCPP_END_NAMESPACE_STD 79 80 _LIBCPP_POP_MACROS 81 82 #endif // _LIBCPP___ALGORITHM_COPY_H 83