1// -*- C++ -*-
2//===--------------------------- cstddef ----------------------------------===//
3//
4//                     The LLVM Compiler Infrastructure
5//
6// This file is dual licensed under the MIT and the University of Illinois Open
7// Source Licenses. See LICENSE.TXT for details.
8//
9//===----------------------------------------------------------------------===//
10
11#ifndef _LIBCPP_CSTDDEF
12#define _LIBCPP_CSTDDEF
13
14/*
15    cstddef synopsis
16
17Macros:
18
19    offsetof(type,member-designator)
20    NULL
21
22namespace std
23{
24
25Types:
26
27    ptrdiff_t
28    size_t
29    max_align_t
30    nullptr_t
31
32}  // std
33
34*/
35
36#include <__config>
37
38#ifdef __GLIBC__
39#define __need_NULL
40#define __need_ptrdiff_t
41#define __need_size_t
42#endif  // __GLIBC__
43
44#include <stddef.h>
45
46#pragma GCC system_header
47
48_LIBCPP_BEGIN_NAMESPACE_STD
49
50using ::ptrdiff_t;
51using ::size_t;
52
53typedef long double max_align_t;
54
55#ifdef _LIBCPP_HAS_NO_NULLPTR
56
57struct _LIBCPP_VISIBLE nullptr_t
58{
59    void* _;
60
61    struct __nat {int __for_bool_;};
62
63    _LIBCPP_ALWAYS_INLINE nullptr_t(int __nat::*) {}
64
65    _LIBCPP_ALWAYS_INLINE operator int __nat::*() const {return 0;}
66
67    template <class _Tp>
68        _LIBCPP_ALWAYS_INLINE
69        operator _Tp* () const {return 0;}
70
71    template <class _Tp, class _Up>
72        _LIBCPP_ALWAYS_INLINE
73        operator _Tp _Up::* () const {return 0;}
74
75    friend _LIBCPP_ALWAYS_INLINE bool operator==(nullptr_t, nullptr_t) {return true;}
76    friend _LIBCPP_ALWAYS_INLINE bool operator!=(nullptr_t, nullptr_t) {return false;}
77    friend _LIBCPP_ALWAYS_INLINE bool operator<(nullptr_t, nullptr_t) {return false;}
78    friend _LIBCPP_ALWAYS_INLINE bool operator<=(nullptr_t, nullptr_t) {return true;}
79    friend _LIBCPP_ALWAYS_INLINE bool operator>(nullptr_t, nullptr_t) {return false;}
80    friend _LIBCPP_ALWAYS_INLINE bool operator>=(nullptr_t, nullptr_t) {return true;}
81};
82
83inline _LIBCPP_ALWAYS_INLINE nullptr_t __get_nullptr_t() {return nullptr_t(0);}
84
85#define nullptr _STD::__get_nullptr_t()
86
87#else  // _LIBCPP_HAS_NO_NULLPTR
88
89typedef decltype(nullptr) nullptr_t;
90
91#endif  // _LIBCPP_HAS_NO_NULLPTR
92
93_LIBCPP_END_NAMESPACE_STD
94
95#endif  // _LIBCPP_CSTDDEF
96