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 23template <class _Tp> struct __is_nullptr_t_impl : public false_type {}; 24template <> struct __is_nullptr_t_impl<nullptr_t> : public true_type {}; 25 26template <class _Tp> struct _LIBCPP_TEMPLATE_VIS __is_nullptr_t 27 : public __is_nullptr_t_impl<__remove_cv_t<_Tp> > {}; 28 29#if _LIBCPP_STD_VER > 11 30template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_null_pointer 31 : public __is_nullptr_t_impl<__remove_cv_t<_Tp> > {}; 32 33#if _LIBCPP_STD_VER > 14 34template <class _Tp> 35inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value; 36#endif 37#endif // _LIBCPP_STD_VER > 11 38 39_LIBCPP_END_NAMESPACE_STD 40 41#endif // _LIBCPP___TYPE_TRAITS_IS_NULL_POINTER_H 42