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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 byte // C++17
32
33} // std
34
35*/
36
37#include <__config>
38
39#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
40#pragma GCC system_header
41#endif
42
43// Don't include our own <stddef.h>; we don't want to declare ::nullptr_t.
44#include_next <stddef.h>
45#include <__nullptr>
46
47_LIBCPP_BEGIN_NAMESPACE_STD
48
49using ::ptrdiff_t;
50using ::size_t;
51
52#if defined(__CLANG_MAX_ALIGN_T_DEFINED) || defined(_GCC_MAX_ALIGN_T) || \
53 defined(__DEFINED_max_align_t)
54// Re-use the compiler's <stddef.h> max_align_t where possible.
55using ::max_align_t;
56#else
57typedef long double max_align_t;
58#endif
59
60_LIBCPP_END_NAMESPACE_STD
61
62#if _LIBCPP_STD_VER > 14
63namespace std // purposefully not versioned
64{
65enum class byte : unsigned char {};
66
67constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept
68{ return __lhs = byte(static_cast<unsigned char>(__lhs) | static_cast<unsigned char>(__rhs)); }
69constexpr byte operator| (byte __lhs, byte __rhs) noexcept
70{ return byte(static_cast<unsigned char>(__lhs) | static_cast<unsigned char>(__rhs)); }
71
72constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept
73{ return __lhs = byte(static_cast<unsigned char>(__lhs) & static_cast<unsigned char>(__rhs)); }
74constexpr byte operator& (byte __lhs, byte __rhs) noexcept
75{ return byte(static_cast<unsigned char>(__lhs) & static_cast<unsigned char>(__rhs)); }
76
77constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept
78{ return __lhs = byte(static_cast<unsigned char>(__lhs) ^ static_cast<unsigned char>(__rhs)); }
79constexpr byte operator^ (byte __lhs, byte __rhs) noexcept
80{ return byte(static_cast<unsigned char>(__lhs) ^ static_cast<unsigned char>(__rhs)); }
81
82constexpr byte operator~ (byte __b) noexcept
83{ return byte(~static_cast<unsigned char>(__b)); }
84
85}
86
87#include <type_traits> // rest of byte
88#endif
89
90#endif // _LIBCPP_CSTDDEF