diff options
Diffstat (limited to 'contrib/llvm-project/libcxx/include/__algorithm/copy.h')
| -rw-r--r-- | contrib/llvm-project/libcxx/include/__algorithm/copy.h | 107 |
1 files changed, 68 insertions, 39 deletions
diff --git a/contrib/llvm-project/libcxx/include/__algorithm/copy.h b/contrib/llvm-project/libcxx/include/__algorithm/copy.h index 65f0e0b0ef7d..886a1ac6ce3e 100644 --- a/contrib/llvm-project/libcxx/include/__algorithm/copy.h +++ b/contrib/llvm-project/libcxx/include/__algorithm/copy.h @@ -12,64 +12,93 @@ #include <__algorithm/unwrap_iter.h> #include <__config> #include <__iterator/iterator_traits.h> +#include <__iterator/reverse_iterator.h> +#include <__utility/move.h> +#include <__utility/pair.h> #include <cstring> #include <type_traits> #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) -#pragma GCC system_header +# pragma GCC system_header #endif _LIBCPP_BEGIN_NAMESPACE_STD // copy -template <class _InputIterator, class _OutputIterator> -inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 -_OutputIterator -__copy_constexpr(_InputIterator __first, _InputIterator __last, _OutputIterator __result) -{ - for (; __first != __last; ++__first, (void) ++__result) - *__result = *__first; - return __result; +template <class _InIter, class _Sent, class _OutIter> +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 +pair<_InIter, _OutIter> __copy_impl(_InIter __first, _Sent __last, _OutIter __result) { + while (__first != __last) { + *__result = *__first; + ++__first; + ++__result; + } + return pair<_InIter, _OutIter>(std::move(__first), std::move(__result)); } -template <class _InputIterator, class _OutputIterator> -inline _LIBCPP_INLINE_VISIBILITY -_OutputIterator -__copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) -{ - return _VSTD::__copy_constexpr(__first, __last, __result); +template <class _InValueT, + class _OutValueT, + class = __enable_if_t<is_same<typename remove_const<_InValueT>::type, _OutValueT>::value + && is_trivially_copy_assignable<_OutValueT>::value> > +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 +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, + __enable_if_t<is_same<typename remove_const<__iter_value_type<_InIter> >::type, __iter_value_type<_OutIter> >::value + && __is_cpp17_contiguous_iterator<_InIter>::value + && __is_cpp17_contiguous_iterator<_OutIter>::value + && is_trivially_copy_assignable<__iter_value_type<_OutIter> >::value, int> = 0> +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 +pair<reverse_iterator<_InIter>, reverse_iterator<_OutIter> > +__copy_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::__copy_impl(__last_base, __first_base, __result_first); + return std::make_pair(__last, reverse_iterator<_OutIter>(std::__rewrap_iter(__result.base(), __result_first))); +} + +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_AFTER_CXX11 +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 _Tp, class _Up> -inline _LIBCPP_INLINE_VISIBILITY -typename enable_if -< - is_same<typename remove_const<_Tp>::type, _Up>::value && - is_trivially_copy_assignable<_Up>::value, - _Up* ->::type -__copy(_Tp* __first, _Tp* __last, _Up* __result) -{ - const size_t __n = static_cast<size_t>(__last - __first); - if (__n > 0) - _VSTD::memmove(__result, __first, __n * sizeof(_Up)); - return __result + __n; +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_AFTER_CXX11 +pair<_InIter, _OutIter> +__copy(_InIter __first, _Sent __last, _OutIter __result) { + auto __ret = std::__copy_impl(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 _InputIterator, class _OutputIterator> inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator -copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) -{ - if (__libcpp_is_constant_evaluated()) { - return _VSTD::__copy_constexpr(__first, __last, __result); - } else { - return _VSTD::__rewrap_iter(__result, - _VSTD::__copy(_VSTD::__unwrap_iter(__first), - _VSTD::__unwrap_iter(__last), - _VSTD::__unwrap_iter(__result))); - } +copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) { + return std::__copy(__first, __last, __result).second; } _LIBCPP_END_NAMESPACE_STD |