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_CVREF_H
10#define _LIBCPP___TYPE_TRAITS_COPY_CVREF_H
11
12#include <__config>
13#include <__type_traits/add_lvalue_reference.h>
14#include <__type_traits/add_rvalue_reference.h>
15#include <__type_traits/copy_cv.h>
16
17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18#  pragma GCC system_header
19#endif
20
21_LIBCPP_BEGIN_NAMESPACE_STD
22
23template <class _From, class _To>
24struct __copy_cvref
25{
26    using type = __copy_cv_t<_From, _To>;
27};
28
29template <class _From, class _To>
30struct __copy_cvref<_From&, _To>
31{
32    using type = __add_lvalue_reference_t<__copy_cv_t<_From, _To> >;
33};
34
35template <class _From, class _To>
36struct __copy_cvref<_From&&, _To>
37{
38    using type = __add_rvalue_reference_t<__copy_cv_t<_From, _To> >;
39};
40
41template <class _From, class _To>
42using __copy_cvref_t = typename __copy_cvref<_From, _To>::type;
43
44_LIBCPP_END_NAMESPACE_STD
45
46#endif // _LIBCPP___TYPE_TRAITS_COPY_CVREF_H
47