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_REMOVE_CVREF_H
10 #define _LIBCPP___TYPE_TRAITS_REMOVE_CVREF_H
11 
12 #include <__config>
13 #include <__type_traits/is_same.h>
14 #include <__type_traits/remove_cv.h>
15 #include <__type_traits/remove_reference.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 
23 template <class _Tp>
24 using __uncvref_t _LIBCPP_NODEBUG = typename remove_cv<typename remove_reference<_Tp>::type>::type;
25 
26 template <class _Tp, class _Up>
27 struct __is_same_uncvref : _IsSame<__uncvref_t<_Tp>, __uncvref_t<_Up> > {};
28 
29 #if _LIBCPP_STD_VER > 17
30 // remove_cvref - same as __uncvref
31 template <class _Tp>
32 struct remove_cvref {
33     using type _LIBCPP_NODEBUG = __uncvref_t<_Tp>;
34 };
35 
36 template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type;
37 #endif
38 
39 _LIBCPP_END_NAMESPACE_STD
40 
41 #endif // _LIBCPP___TYPE_TRAITS_REMOVE_CVREF_H
42