2 //===--------------------------- cstddef ----------------------------------===//
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
8 //===----------------------------------------------------------------------===//
10 #ifndef _LIBCPP_CSTDDEF
11 #define _LIBCPP_CSTDDEF
18 offsetof(type,member-designator)
39 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
40 #pragma GCC system_header
43 // Don't include our own <stddef.h>; we don't want to declare ::nullptr_t.
44 #include_next <stddef.h>
47 _LIBCPP_BEGIN_NAMESPACE_STD
52 #if defined(__CLANG_MAX_ALIGN_T_DEFINED) || defined(_GCC_MAX_ALIGN_T) || \
53 defined(__DEFINED_max_align_t) || defined(__NetBSD__)
54 // Re-use the compiler's <stddef.h> max_align_t where possible.
57 typedef long double max_align_t;
60 _LIBCPP_END_NAMESPACE_STD
62 #if _LIBCPP_STD_VER > 14
63 namespace std // purposefully not versioned
65 enum class byte : unsigned char {};
67 constexpr byte operator| (byte __lhs, byte __rhs) noexcept
69 return static_cast<byte>(
70 static_cast<unsigned char>(
71 static_cast<unsigned int>(__lhs) | static_cast<unsigned int>(__rhs)
75 constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept
76 { return __lhs = __lhs | __rhs; }
78 constexpr byte operator& (byte __lhs, byte __rhs) noexcept
80 return static_cast<byte>(
81 static_cast<unsigned char>(
82 static_cast<unsigned int>(__lhs) & static_cast<unsigned int>(__rhs)
86 constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept
87 { return __lhs = __lhs & __rhs; }
89 constexpr byte operator^ (byte __lhs, byte __rhs) noexcept
91 return static_cast<byte>(
92 static_cast<unsigned char>(
93 static_cast<unsigned int>(__lhs) ^ static_cast<unsigned int>(__rhs)
97 constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept
98 { return __lhs = __lhs ^ __rhs; }
100 constexpr byte operator~ (byte __b) noexcept
102 return static_cast<byte>(
103 static_cast<unsigned char>(
104 ~static_cast<unsigned int>(__b)
110 #include <type_traits> // rest of byte
113 #endif // _LIBCPP_CSTDDEF