include/cstddef

// -*- C++ -*-
//===--------------------------- cstddef ----------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_CSTDDEF
#define _LIBCPP_CSTDDEF

/*
 cstddef synopsis

Macros:

 offsetof(type,member-designator)
 NULL

namespace std
{

Types:

 ptrdiff_t
 size_t
 max_align_t
 nullptr_t
 byte // C++17

} // std

*/

#include <__config>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

// Don't include our own <stddef.h>; we don't want to declare ::nullptr_t.
#include_next <stddef.h>
#include <__nullptr>

_LIBCPP_BEGIN_NAMESPACE_STD

using ::ptrdiff_t;
using ::size_t;

#if defined(__CLANG_MAX_ALIGN_T_DEFINED) || defined(_GCC_MAX_ALIGN_T) || \
 defined(__DEFINED_max_align_t)
// Re-use the compiler's <stddef.h> max_align_t where possible.
using ::max_align_t;
#else
typedef long double max_align_t;
#endif

_LIBCPP_END_NAMESPACE_STD

#if _LIBCPP_STD_VER > 14
namespace std // purposefully not versioned
{
enum class byte : unsigned char {};

constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept
{ return __lhs = byte(static_cast<unsigned char>(__lhs) | static_cast<unsigned char>(__rhs)); }
constexpr byte operator| (byte __lhs, byte __rhs) noexcept
{ return byte(static_cast<unsigned char>(__lhs) | static_cast<unsigned char>(__rhs)); }

constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept
{ return __lhs = byte(static_cast<unsigned char>(__lhs) & static_cast<unsigned char>(__rhs)); }
constexpr byte operator& (byte __lhs, byte __rhs) noexcept
{ return byte(static_cast<unsigned char>(__lhs) & static_cast<unsigned char>(__rhs)); }

constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept 
{ return __lhs = byte(static_cast<unsigned char>(__lhs) ^ static_cast<unsigned char>(__rhs)); }
constexpr byte operator^ (byte __lhs, byte __rhs) noexcept
{ return byte(static_cast<unsigned char>(__lhs) ^ static_cast<unsigned char>(__rhs)); }

constexpr byte operator~ (byte __b) noexcept
{ return byte(~static_cast<unsigned char>(__b)); }

}

#include <type_traits> // rest of byte
#endif

#endif // _LIBCPP_CSTDDEF