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| 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___TYPE_TRAITS_COPY_CV_H |
| 10 | #define _LIBCPP___TYPE_TRAITS_COPY_CV_H |
| 11 | |
| 12 | #include <__config> |
| 13 | |
| 14 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 15 | # pragma GCC system_header |
| 16 | #endif |
| 17 | |
| 18 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 19 | |
| 20 | // Let COPYCV(FROM, TO) be an alias for type TO with the addition of FROM's |
| 21 | // top-level cv-qualifiers. |
| 22 | template <class _From> |
| 23 | struct __copy_cv { |
| 24 | template <class _To> |
| 25 | using __apply _LIBCPP_NODEBUG = _To; |
| 26 | }; |
| 27 | |
| 28 | template <class _From> |
| 29 | struct __copy_cv<const _From> { |
| 30 | template <class _To> |
| 31 | using __apply _LIBCPP_NODEBUG = const _To; |
| 32 | }; |
| 33 | |
| 34 | template <class _From> |
| 35 | struct __copy_cv<volatile _From> { |
| 36 | template <class _To> |
| 37 | using __apply _LIBCPP_NODEBUG = volatile _To; |
| 38 | }; |
| 39 | |
| 40 | template <class _From> |
| 41 | struct __copy_cv<const volatile _From> { |
| 42 | template <class _To> |
| 43 | using __apply _LIBCPP_NODEBUG = const volatile _To; |
| 44 | }; |
| 45 | |
| 46 | template <class _From, class _To> |
| 47 | using __copy_cv_t _LIBCPP_NODEBUG = typename __copy_cv<_From>::template __apply<_To>; |
| 48 | |
| 49 | _LIBCPP_END_NAMESPACE_STD |
| 50 | |
| 51 | #endif // _LIBCPP___TYPE_TRAITS_COPY_CV_H |
| 52 |
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