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