1// -*- C++ -*- 2//===--------------------------- cstddef ----------------------------------===// 3// 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 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_CSTDDEF 11#define _LIBCPP_CSTDDEF 12 13/* 14 cstddef synopsis 15 16Macros: 17 18 offsetof(type,member-designator) 19 NULL 20 21namespace std 22{ 23 24Types: 25 26 ptrdiff_t 27 size_t 28 max_align_t 29 nullptr_t 30 byte // C++17 31 32} // std 33 34*/ 35 36#include <__config> 37#include <version> 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) || defined(__NetBSD__) 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{ 69 return static_cast<byte>( 70 static_cast<unsigned char>( 71 static_cast<unsigned int>(__lhs) | static_cast<unsigned int>(__rhs) 72 )); 73} 74 75constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept 76{ return __lhs = __lhs | __rhs; } 77 78constexpr byte operator& (byte __lhs, byte __rhs) noexcept 79{ 80 return static_cast<byte>( 81 static_cast<unsigned char>( 82 static_cast<unsigned int>(__lhs) & static_cast<unsigned int>(__rhs) 83 )); 84} 85 86constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept 87{ return __lhs = __lhs & __rhs; } 88 89constexpr byte operator^ (byte __lhs, byte __rhs) noexcept 90{ 91 return static_cast<byte>( 92 static_cast<unsigned char>( 93 static_cast<unsigned int>(__lhs) ^ static_cast<unsigned int>(__rhs) 94 )); 95} 96 97constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept 98{ return __lhs = __lhs ^ __rhs; } 99 100constexpr byte operator~ (byte __b) noexcept 101{ 102 return static_cast<byte>( 103 static_cast<unsigned char>( 104 ~static_cast<unsigned int>(__b) 105 )); 106} 107 108} 109 110#include <type_traits> // rest of byte 111#endif 112 113#endif // _LIBCPP_CSTDDEF 114