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The C and C++ Include Header Files
/usr/include/c++/13/cstddef
$ cat -n /usr/include/c++/13/cstddef 1 // -*- C++ -*- forwarding header. 2 3 // Copyright (C) 1997-2023 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file cstddef 26 * This is a Standard C++ Library file. You should @c \#include this file 27 * in your programs, rather than any of the @a *.h implementation files. 28 * 29 * This is the C++ version of the Standard C Library header @c stddef.h, 30 * and its contents are (mostly) the same as that header, but are all 31 * contained in the namespace @c std (except for names which are defined 32 * as macros in C). 33 */ 34 35 // 36 // ISO C++ 14882: 18.1 Types 37 // 38 39 #ifndef _GLIBCXX_CSTDDEF 40 #define _GLIBCXX_CSTDDEF 1 41 42 #pragma GCC system_header 43 44 #undef __need_wchar_t 45 #undef __need_ptrdiff_t 46 #undef __need_size_t 47 #undef __need_NULL 48 #undef __need_wint_t 49 #include <bits/c++config.h> 50 #include <stddef.h> 51 52 extern "C++" 53 { 54 #if __cplusplus >= 201103L 55 namespace std 56 { 57 // We handle size_t, ptrdiff_t, and nullptr_t in c++config.h. 58 using ::max_align_t; 59 } 60 #endif // C++11 61 62 #if __cplusplus >= 201703L 63 namespace std 64 { 65 _GLIBCXX_BEGIN_NAMESPACE_VERSION 66 #define __cpp_lib_byte 201603L 67 68 /// std::byte 69 enum class byte : unsigned char {}; 70 71 template<typename _IntegerType> struct __byte_operand { }; 72 template<> struct __byte_operand<bool> { using __type = byte; }; 73 template<> struct __byte_operand<char> { using __type = byte; }; 74 template<> struct __byte_operand<signed char> { using __type = byte; }; 75 template<> struct __byte_operand<unsigned char> { using __type = byte; }; 76 template<> struct __byte_operand<wchar_t> { using __type = byte; }; 77 #ifdef _GLIBCXX_USE_CHAR8_T 78 template<> struct __byte_operand<char8_t> { using __type = byte; }; 79 #endif 80 template<> struct __byte_operand<char16_t> { using __type = byte; }; 81 template<> struct __byte_operand<char32_t> { using __type = byte; }; 82 template<> struct __byte_operand<short> { using __type = byte; }; 83 template<> struct __byte_operand<unsigned short> { using __type = byte; }; 84 template<> struct __byte_operand<int> { using __type = byte; }; 85 template<> struct __byte_operand<unsigned int> { using __type = byte; }; 86 template<> struct __byte_operand<long> { using __type = byte; }; 87 template<> struct __byte_operand<unsigned long> { using __type = byte; }; 88 template<> struct __byte_operand<long long> { using __type = byte; }; 89 template<> struct __byte_operand<unsigned long long> { using __type = byte; }; 90 #if defined(__GLIBCXX_TYPE_INT_N_0) 91 template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_0> 92 { using __type = byte; }; 93 template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_0> 94 { using __type = byte; }; 95 #endif 96 #if defined(__GLIBCXX_TYPE_INT_N_1) 97 template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_1> 98 { using __type = byte; }; 99 template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_1> 100 { using __type = byte; }; 101 #endif 102 #if defined(__GLIBCXX_TYPE_INT_N_2) 103 template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_2> 104 { using __type = byte; }; 105 template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_2> 106 { using __type = byte; }; 107 #endif 108 template<typename _IntegerType> 109 struct __byte_operand<const _IntegerType> 110 : __byte_operand<_IntegerType> { }; 111 template<typename _IntegerType> 112 struct __byte_operand<volatile _IntegerType> 113 : __byte_operand<_IntegerType> { }; 114 template<typename _IntegerType> 115 struct __byte_operand<const volatile _IntegerType> 116 : __byte_operand<_IntegerType> { }; 117 118 template<typename _IntegerType> 119 using __byte_op_t = typename __byte_operand<_IntegerType>::__type; 120 121 template<typename _IntegerType> 122 [[__gnu__::__always_inline__]] 123 constexpr __byte_op_t<_IntegerType> 124 operator<<(byte __b, _IntegerType __shift) noexcept 125 { return (byte)(unsigned char)((unsigned)__b << __shift); } 126 127 template<typename _IntegerType> 128 [[__gnu__::__always_inline__]] 129 constexpr __byte_op_t<_IntegerType> 130 operator>>(byte __b, _IntegerType __shift) noexcept 131 { return (byte)(unsigned char)((unsigned)__b >> __shift); } 132 133 [[__gnu__::__always_inline__]] 134 constexpr byte 135 operator|(byte __l, byte __r) noexcept 136 { return (byte)(unsigned char)((unsigned)__l | (unsigned)__r); } 137 138 [[__gnu__::__always_inline__]] 139 constexpr byte 140 operator&(byte __l, byte __r) noexcept 141 { return (byte)(unsigned char)((unsigned)__l & (unsigned)__r); } 142 143 [[__gnu__::__always_inline__]] 144 constexpr byte 145 operator^(byte __l, byte __r) noexcept 146 { return (byte)(unsigned char)((unsigned)__l ^ (unsigned)__r); } 147 148 [[__gnu__::__always_inline__]] 149 constexpr byte 150 operator~(byte __b) noexcept 151 { return (byte)(unsigned char)~(unsigned)__b; } 152 153 template<typename _IntegerType> 154 [[__gnu__::__always_inline__]] 155 constexpr __byte_op_t<_IntegerType>& 156 operator<<=(byte& __b, _IntegerType __shift) noexcept 157 { return __b = __b << __shift; } 158 159 template<typename _IntegerType> 160 [[__gnu__::__always_inline__]] 161 constexpr __byte_op_t<_IntegerType>& 162 operator>>=(byte& __b, _IntegerType __shift) noexcept 163 { return __b = __b >> __shift; } 164 165 [[__gnu__::__always_inline__]] 166 constexpr byte& 167 operator|=(byte& __l, byte __r) noexcept 168 { return __l = __l | __r; } 169 170 [[__gnu__::__always_inline__]] 171 constexpr byte& 172 operator&=(byte& __l, byte __r) noexcept 173 { return __l = __l & __r; } 174 175 [[__gnu__::__always_inline__]] 176 constexpr byte& 177 operator^=(byte& __l, byte __r) noexcept 178 { return __l = __l ^ __r; } 179 180 template<typename _IntegerType> 181 [[nodiscard,__gnu__::__always_inline__]] 182 constexpr _IntegerType 183 to_integer(__byte_op_t<_IntegerType> __b) noexcept 184 { return _IntegerType(__b); } 185 186 _GLIBCXX_END_NAMESPACE_VERSION 187 } // namespace std 188 #endif // C++17 189 } // extern "C++" 190 191 #endif // _GLIBCXX_CSTDDEF
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