| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___TYPE_TRAITS_COPY_CV_H |
| #define _LIBCPP___TYPE_TRAITS_COPY_CV_H |
| |
| #include <__config> |
| #include <__type_traits/add_const.h> |
| #include <__type_traits/add_cv.h> |
| #include <__type_traits/add_volatile.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| // Let COPYCV(FROM, TO) be an alias for type TO with the addition of FROM's |
| // top-level cv-qualifiers. |
| template <class _From, class _To> |
| struct __copy_cv |
| { |
| using type = _To; |
| }; |
| |
| template <class _From, class _To> |
| struct __copy_cv<const _From, _To> |
| { |
| using type = typename add_const<_To>::type; |
| }; |
| |
| template <class _From, class _To> |
| struct __copy_cv<volatile _From, _To> |
| { |
| using type = typename add_volatile<_To>::type; |
| }; |
| |
| template <class _From, class _To> |
| struct __copy_cv<const volatile _From, _To> |
| { |
| using type = typename add_cv<_To>::type; |
| }; |
| |
| template <class _From, class _To> |
| using __copy_cv_t = typename __copy_cv<_From, _To>::type; |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___TYPE_TRAITS_COPY_CV_H |