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> struct __is_nullptr_t_impl : public false_type {}; 24 template <> struct __is_nullptr_t_impl<nullptr_t> : public true_type {}; 25 26 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS __is_nullptr_t 27 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 28 29 #if _LIBCPP_STD_VER > 11 30 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_null_pointer 31 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 32 33 #if _LIBCPP_STD_VER > 14 34 template <class _Tp> 35 inline 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