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/remove_cv.h>
16 #include <__type_traits/remove_reference.h>
17 
18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19 #  pragma GCC system_header
20 #endif
21 
22 _LIBCPP_BEGIN_NAMESPACE_STD
23 
24 #if __has_builtin(__add_pointer)
25 template <class _Tp>
26 struct add_pointer {
27   using type _LIBCPP_NODEBUG = __add_pointer(_Tp);
28 };
29 #else
30 template <class _Tp,
31           bool = __libcpp_is_referenceable<_Tp>::value || _IsSame<typename remove_cv<_Tp>::type, void>::value>
32 struct __add_pointer_impl {
33   typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type* type;
34 };
35 template <class _Tp> struct __add_pointer_impl<_Tp, false>
36     {typedef _LIBCPP_NODEBUG _Tp type;};
37 
38 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_pointer
39     {typedef _LIBCPP_NODEBUG typename __add_pointer_impl<_Tp>::type type;};
40 #endif // __has_builtin(__add_pointer)
41 
42 #if _LIBCPP_STD_VER > 11
43 template <class _Tp> using add_pointer_t = typename add_pointer<_Tp>::type;
44 #endif
45 
46 _LIBCPP_END_NAMESPACE_STD
47 
48 #endif // _LIBCPP___TYPE_TRAITS_ADD_POINTER_H
49