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 91