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 constexpr byte operator| (byte __lhs, byte __rhs) noexcept 75{ 76 return static_cast<byte>( 77 static_cast<unsigned char>( 78 static_cast<unsigned int>(__lhs) | static_cast<unsigned int>(__rhs) 79 )); 80} 81 82_LIBCPP_HIDE_FROM_ABI constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept 83{ return __lhs = __lhs | __rhs; } 84 85_LIBCPP_HIDE_FROM_ABI constexpr byte operator& (byte __lhs, byte __rhs) noexcept 86{ 87 return static_cast<byte>( 88 static_cast<unsigned char>( 89 static_cast<unsigned int>(__lhs) & static_cast<unsigned int>(__rhs) 90 )); 91} 92 93_LIBCPP_HIDE_FROM_ABI constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept 94{ return __lhs = __lhs & __rhs; } 95 96_LIBCPP_HIDE_FROM_ABI constexpr byte operator^ (byte __lhs, byte __rhs) noexcept 97{ 98 return static_cast<byte>( 99 static_cast<unsigned char>( 100 static_cast<unsigned int>(__lhs) ^ static_cast<unsigned int>(__rhs) 101 )); 102} 103 104_LIBCPP_HIDE_FROM_ABI constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept 105{ return __lhs = __lhs ^ __rhs; } 106 107_LIBCPP_HIDE_FROM_ABI constexpr byte operator~ (byte __b) noexcept 108{ 109 return static_cast<byte>( 110 static_cast<unsigned char>( 111 ~static_cast<unsigned int>(__b) 112 )); 113} 114 115template <class _Tp> 116using _EnableByteOverload = __enable_if_t<is_integral<_Tp>::value, byte>; 117 118template <class _Integer> 119_LIBCPP_HIDE_FROM_ABI constexpr _EnableByteOverload<_Integer> & 120 operator<<=(byte& __lhs, _Integer __shift) noexcept 121 { return __lhs = __lhs << __shift; } 122 123template <class _Integer> 124_LIBCPP_HIDE_FROM_ABI constexpr _EnableByteOverload<_Integer> 125 operator<< (byte __lhs, _Integer __shift) noexcept 126 { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) << __shift)); } 127 128template <class _Integer> 129_LIBCPP_HIDE_FROM_ABI constexpr _EnableByteOverload<_Integer> & 130 operator>>=(byte& __lhs, _Integer __shift) noexcept 131 { return __lhs = __lhs >> __shift; } 132 133template <class _Integer> 134_LIBCPP_HIDE_FROM_ABI constexpr _EnableByteOverload<_Integer> 135 operator>> (byte __lhs, _Integer __shift) noexcept 136 { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) >> __shift)); } 137 138template <class _Integer, class = _EnableByteOverload<_Integer> > 139_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr _Integer 140 to_integer(byte __b) noexcept { return static_cast<_Integer>(__b); } 141 142} // namespace std 143 144#endif 145 146#endif // _LIBCPP_CSTDDEF 147