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The C and C++ Include Header Files
/usr/include/c++/11/cstddef
$ cat -n /usr/include/c++/11/cstddef 1 // -*- C++ -*- forwarding header. 2 3 // Copyright (C) 1997-2021 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 201603 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 #ifdef _GLIBCXX_USE_WCHAR_T 77 template<> struct __byte_operand<wchar_t> { using __type = byte; }; 78 #endif 79 #ifdef _GLIBCXX_USE_CHAR8_T 80 template<> struct __byte_operand<char8_t> { using __type = byte; }; 81 #endif 82 template<> struct __byte_operand<char16_t> { using __type = byte; }; 83 template<> struct __byte_operand<char32_t> { using __type = byte; }; 84 template<> struct __byte_operand<short> { using __type = byte; }; 85 template<> struct __byte_operand<unsigned short> { using __type = byte; }; 86 template<> struct __byte_operand<int> { using __type = byte; }; 87 template<> struct __byte_operand<unsigned int> { using __type = byte; }; 88 template<> struct __byte_operand<long> { using __type = byte; }; 89 template<> struct __byte_operand<unsigned long> { using __type = byte; }; 90 template<> struct __byte_operand<long long> { using __type = byte; }; 91 template<> struct __byte_operand<unsigned long long> { using __type = byte; }; 92 #if defined(__GLIBCXX_TYPE_INT_N_0) 93 template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_0> 94 { using __type = byte; }; 95 template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_0> 96 { using __type = byte; }; 97 #endif 98 #if defined(__GLIBCXX_TYPE_INT_N_1) 99 template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_1> 100 { using __type = byte; }; 101 template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_1> 102 { using __type = byte; }; 103 #endif 104 #if defined(__GLIBCXX_TYPE_INT_N_2) 105 template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_2> 106 { using __type = byte; }; 107 template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_2> 108 { using __type = byte; }; 109 #endif 110 template<typename _IntegerType> 111 struct __byte_operand<const _IntegerType> 112 : __byte_operand<_IntegerType> { }; 113 template<typename _IntegerType> 114 struct __byte_operand<volatile _IntegerType> 115 : __byte_operand<_IntegerType> { }; 116 template<typename _IntegerType> 117 struct __byte_operand<const volatile _IntegerType> 118 : __byte_operand<_IntegerType> { }; 119 120 template<typename _IntegerType> 121 using __byte_op_t = typename __byte_operand<_IntegerType>::__type; 122 123 template<typename _IntegerType> 124 [[__gnu__::__always_inline__]] 125 constexpr __byte_op_t<_IntegerType> 126 operator<<(byte __b, _IntegerType __shift) noexcept 127 { return (byte)(unsigned char)((unsigned)__b << __shift); } 128 129 template<typename _IntegerType> 130 [[__gnu__::__always_inline__]] 131 constexpr __byte_op_t<_IntegerType> 132 operator>>(byte __b, _IntegerType __shift) noexcept 133 { return (byte)(unsigned char)((unsigned)__b >> __shift); } 134 135 [[__gnu__::__always_inline__]] 136 constexpr byte 137 operator|(byte __l, byte __r) noexcept 138 { return (byte)(unsigned char)((unsigned)__l | (unsigned)__r); } 139 140 [[__gnu__::__always_inline__]] 141 constexpr byte 142 operator&(byte __l, byte __r) noexcept 143 { return (byte)(unsigned char)((unsigned)__l & (unsigned)__r); } 144 145 [[__gnu__::__always_inline__]] 146 constexpr byte 147 operator^(byte __l, byte __r) noexcept 148 { return (byte)(unsigned char)((unsigned)__l ^ (unsigned)__r); } 149 150 [[__gnu__::__always_inline__]] 151 constexpr byte 152 operator~(byte __b) noexcept 153 { return (byte)(unsigned char)~(unsigned)__b; } 154 155 template<typename _IntegerType> 156 [[__gnu__::__always_inline__]] 157 constexpr __byte_op_t<_IntegerType>& 158 operator<<=(byte& __b, _IntegerType __shift) noexcept 159 { return __b = __b << __shift; } 160 161 template<typename _IntegerType> 162 [[__gnu__::__always_inline__]] 163 constexpr __byte_op_t<_IntegerType>& 164 operator>>=(byte& __b, _IntegerType __shift) noexcept 165 { return __b = __b >> __shift; } 166 167 [[__gnu__::__always_inline__]] 168 constexpr byte& 169 operator|=(byte& __l, byte __r) noexcept 170 { return __l = __l | __r; } 171 172 [[__gnu__::__always_inline__]] 173 constexpr byte& 174 operator&=(byte& __l, byte __r) noexcept 175 { return __l = __l & __r; } 176 177 [[__gnu__::__always_inline__]] 178 constexpr byte& 179 operator^=(byte& __l, byte __r) noexcept 180 { return __l = __l ^ __r; } 181 182 template<typename _IntegerType> 183 [[nodiscard,__gnu__::__always_inline__]] 184 constexpr _IntegerType 185 to_integer(__byte_op_t<_IntegerType> __b) noexcept 186 { return _IntegerType(__b); } 187 188 _GLIBCXX_END_NAMESPACE_VERSION 189 } // namespace std 190 #endif // C++17 191 } // extern "C++" 192 193 #endif // _GLIBCXX_CSTDDEF
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