1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 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 // C++11 29 nullptr_t 30 byte // C++17 31 32} // std 33 34*/ 35 36#include <__assert> // all public C++ headers provide the assertion handler 37#include <__config> 38#include <__type_traits/enable_if.h> 39#include <__type_traits/integral_constant.h> 40#include <__type_traits/is_integral.h> 41#include <version> 42 43#include <stddef.h> 44 45#ifndef _LIBCPP_STDDEF_H 46# error <cstddef> tried including <stddef.h> but didn't find libc++'s <stddef.h> header. \ 47 This usually means that your header search paths are not configured properly. \ 48 The header search paths should contain the C++ Standard Library headers before \ 49 any C Standard Library, and you are probably using compiler flags that make that \ 50 not be the case. 51#endif 52 53#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 54# pragma GCC system_header 55#endif 56 57_LIBCPP_BEGIN_NAMESPACE_STD 58 59using ::nullptr_t; 60using ::ptrdiff_t _LIBCPP_USING_IF_EXISTS; 61using ::size_t _LIBCPP_USING_IF_EXISTS; 62 63#if !defined(_LIBCPP_CXX03_LANG) 64using ::max_align_t _LIBCPP_USING_IF_EXISTS; 65#endif 66 67_LIBCPP_END_NAMESPACE_STD 68 69#if _LIBCPP_STD_VER >= 17 70namespace std // purposefully not versioned 71{ 72enum class byte : unsigned char {}; 73 74_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator|(byte __lhs, byte __rhs) noexcept { 75 return static_cast<byte>( 76 static_cast<unsigned char>(static_cast<unsigned int>(__lhs) | static_cast<unsigned int>(__rhs))); 77} 78 79_LIBCPP_HIDE_FROM_ABI inline constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept { 80 return __lhs = __lhs | __rhs; 81} 82 83_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator&(byte __lhs, byte __rhs) noexcept { 84 return static_cast<byte>( 85 static_cast<unsigned char>(static_cast<unsigned int>(__lhs) & static_cast<unsigned int>(__rhs))); 86} 87 88_LIBCPP_HIDE_FROM_ABI inline constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept { 89 return __lhs = __lhs & __rhs; 90} 91 92_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator^(byte __lhs, byte __rhs) noexcept { 93 return static_cast<byte>( 94 static_cast<unsigned char>(static_cast<unsigned int>(__lhs) ^ static_cast<unsigned int>(__rhs))); 95} 96 97_LIBCPP_HIDE_FROM_ABI inline constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept { 98 return __lhs = __lhs ^ __rhs; 99} 100 101_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator~(byte __b) noexcept { 102 return static_cast<byte>(static_cast<unsigned char>(~static_cast<unsigned int>(__b))); 103} 104 105template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0> 106_LIBCPP_HIDE_FROM_ABI constexpr byte& operator<<=(byte& __lhs, _Integer __shift) noexcept { 107 return __lhs = __lhs << __shift; 108} 109 110template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0> 111_LIBCPP_HIDE_FROM_ABI constexpr byte operator<<(byte __lhs, _Integer __shift) noexcept { 112 return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) << __shift)); 113} 114 115template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0> 116_LIBCPP_HIDE_FROM_ABI constexpr byte& operator>>=(byte& __lhs, _Integer __shift) noexcept { 117 return __lhs = __lhs >> __shift; 118} 119 120template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0> 121_LIBCPP_HIDE_FROM_ABI constexpr byte operator>>(byte __lhs, _Integer __shift) noexcept { 122 return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) >> __shift)); 123} 124 125template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0> 126_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr _Integer to_integer(byte __b) noexcept { 127 return static_cast<_Integer>(__b); 128} 129 130} // namespace std 131 132#endif 133 134#endif // _LIBCPP_CSTDDEF 135