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