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_ADD_POINTER_H
10 #define _LIBCPP___TYPE_TRAITS_ADD_POINTER_H
11 
12 #include <__config>
13 #include <__type_traits/is_referenceable.h>
14 #include <__type_traits/is_same.h>
15 #include <__type_traits/is_void.h>
16 #include <__type_traits/remove_cv.h>
17 #include <__type_traits/remove_reference.h>
18 
19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20 #  pragma GCC system_header
21 #endif
22 
23 _LIBCPP_BEGIN_NAMESPACE_STD
24 
25 #if !defined(_LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS) && __has_builtin(__add_pointer)
26 
27 template <class _Tp>
28 using __add_pointer_t = __add_pointer(_Tp);
29 
30 #else
31 template <class _Tp, bool = __libcpp_is_referenceable<_Tp>::value || is_void<_Tp>::value>
32 struct __add_pointer_impl {
33   typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tp>* type;
34 };
35 template <class _Tp>
36 struct __add_pointer_impl<_Tp, false> {
37   typedef _LIBCPP_NODEBUG _Tp type;
38 };
39 
40 template <class _Tp>
41 using __add_pointer_t = typename __add_pointer_impl<_Tp>::type;
42 
43 #endif // !defined(_LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS) && __has_builtin(__add_pointer)
44 
45 template <class _Tp>
46 struct add_pointer {
47   using type _LIBCPP_NODEBUG = __add_pointer_t<_Tp>;
48 };
49 
50 #if _LIBCPP_STD_VER >= 14
51 template <class _Tp>
52 using add_pointer_t = __add_pointer_t<_Tp>;
53 #endif
54 
55 _LIBCPP_END_NAMESPACE_STD
56 
57 #endif // _LIBCPP___TYPE_TRAITS_ADD_POINTER_H
58