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_NO_SPECIALIZATIONS is_pointer : _BoolConstant<__is_pointer(_Tp)> {}; 26 27 # if _LIBCPP_STD_VER >= 17 28 template <class _Tp> 29 _LIBCPP_NO_SPECIALIZATIONS 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 : false_type {}; 36 template <class _Tp> 37 struct __libcpp_is_pointer<_Tp*> : true_type {}; 38 39 template <class _Tp> 40 struct __libcpp_remove_objc_qualifiers { 41 typedef _Tp type; 42 }; 43 # if __has_feature(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 is_pointer : __libcpp_is_pointer<typename __libcpp_remove_objc_qualifiers<__remove_cv_t<_Tp> >::type> {}; 54 55 # if _LIBCPP_STD_VER >= 17 56 template <class _Tp> 57 inline constexpr bool is_pointer_v = is_pointer<_Tp>::value; 58 # endif 59 60 #endif // __has_builtin(__is_pointer) 61 62 _LIBCPP_END_NAMESPACE_STD 63 64 #endif // _LIBCPP___TYPE_TRAITS_IS_POINTER_H 65