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_NULL_POINTER_H 10 #define _LIBCPP___TYPE_TRAITS_IS_NULL_POINTER_H 11 12 #include <__config> 13 #include <__type_traits/integral_constant.h> 14 #include <__type_traits/remove_cv.h> 15 #include <cstddef> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 # pragma GCC system_header 19 #endif 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 template <class _Tp> 24 struct __is_nullptr_t_impl : public false_type {}; 25 template <> 26 struct __is_nullptr_t_impl<nullptr_t> : public true_type {}; 27 28 template <class _Tp> 29 struct _LIBCPP_TEMPLATE_VIS __is_nullptr_t : public __is_nullptr_t_impl<__remove_cv_t<_Tp> > {}; 30 31 #if _LIBCPP_STD_VER >= 14 32 template <class _Tp> 33 struct _LIBCPP_TEMPLATE_VIS is_null_pointer : public __is_nullptr_t_impl<__remove_cv_t<_Tp> > {}; 34 35 # if _LIBCPP_STD_VER >= 17 36 template <class _Tp> 37 inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value; 38 # endif 39 #endif // _LIBCPP_STD_VER >= 14 40 41 _LIBCPP_END_NAMESPACE_STD 42 43 #endif // _LIBCPP___TYPE_TRAITS_IS_NULL_POINTER_H 44