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 > 14 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> struct __libcpp_is_pointer : public false_type {}; 35 template <class _Tp> struct __libcpp_is_pointer<_Tp*> : public true_type {}; 36 37 template <class _Tp> struct __libcpp_remove_objc_qualifiers { typedef _Tp type; }; 38 #if defined(_LIBCPP_HAS_OBJC_ARC) 39 template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __strong> { typedef _Tp type; }; 40 template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __weak> { typedef _Tp type; }; 41 template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __autoreleasing> { typedef _Tp type; }; 42 template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __unsafe_unretained> { typedef _Tp type; }; 43 #endif 44 45 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pointer 46 : public __libcpp_is_pointer<typename __libcpp_remove_objc_qualifiers<__remove_cv_t<_Tp> >::type> {}; 47 48 #if _LIBCPP_STD_VER > 14 49 template <class _Tp> 50 inline constexpr bool is_pointer_v = is_pointer<_Tp>::value; 51 #endif 52 53 #endif // __has_builtin(__is_pointer) 54 55 _LIBCPP_END_NAMESPACE_STD 56 57 #endif // _LIBCPP___TYPE_TRAITS_IS_POINTER_H 58