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_IS_POINTER_H
10 #define _LIBCPP___TYPE_TRAITS_IS_POINTER_H
11 
12 #include <__config>
13 #include <__type_traits/integral_constant.h>
14 #include <__type_traits/remove_cv.h>
15 
16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17 #  pragma GCC system_header
18 #endif
19 
20 _LIBCPP_BEGIN_NAMESPACE_STD
21 
22 #if __has_builtin(__is_pointer)
23 
24 template <class _Tp>
25 struct _LIBCPP_TEMPLATE_VIS is_pointer : _BoolConstant<__is_pointer(_Tp)> {};
26 
27 #  if _LIBCPP_STD_VER >= 17
28 template <class _Tp>
29 inline constexpr bool is_pointer_v = __is_pointer(_Tp);
30 #  endif
31 
32 #else // __has_builtin(__is_pointer)
33 
34 template <class _Tp>
35 struct __libcpp_is_pointer : public false_type {};
36 template <class _Tp>
37 struct __libcpp_is_pointer<_Tp*> : public true_type {};
38 
39 template <class _Tp>
40 struct __libcpp_remove_objc_qualifiers {
41   typedef _Tp type;
42 };
43 #  if defined(_LIBCPP_HAS_OBJC_ARC)
44 // clang-format off
45 template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __strong> { typedef _Tp type; };
46 template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __weak> { typedef _Tp type; };
47 template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __autoreleasing> { typedef _Tp type; };
48 template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __unsafe_unretained> { typedef _Tp type; };
49 // clang-format on
50 #  endif
51 
52 template <class _Tp>
53 struct _LIBCPP_TEMPLATE_VIS is_pointer
54     : public __libcpp_is_pointer<typename __libcpp_remove_objc_qualifiers<__remove_cv_t<_Tp> >::type> {};
55 
56 #  if _LIBCPP_STD_VER >= 17
57 template <class _Tp>
58 inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
59 #  endif
60 
61 #endif // __has_builtin(__is_pointer)
62 
63 _LIBCPP_END_NAMESPACE_STD
64 
65 #endif // _LIBCPP___TYPE_TRAITS_IS_POINTER_H
66