libstdc++: cstddef Source File

libstdc++

cstddef
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1// -*- C++ -*- forwarding header.
2
3// Copyright (C) 1997-2026 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#ifdef _GLIBCXX_SYSHDR
43#pragma GCC system_header
44#endif
45
46#undef __need_wchar_t
47#undef __need_ptrdiff_t
48#undef __need_size_t
49#undef __need_NULL
50#undef __need_wint_t
51#include <bits/c++config.h>
52#include <stddef.h>
53
54#define __glibcxx_want_byte
55#include <bits/version.h>
56
57#pragma GCC diagnostic push
58#pragma GCC diagnostic ignored "-Wpedantic" // __int128
59
60extern "C++"
61{
62#if __cplusplus >= 201103L
63namespace std
64{
65 // We handle size_t, ptrdiff_t, and nullptr_t in c++config.h.
66 using ::max_align_t;
67}
68#endif // C++11
69
70#ifdef __cpp_lib_byte // C++ >= 17
71namespace std
72{
73_GLIBCXX_BEGIN_NAMESPACE_VERSION
74 /// std::byte
75 enum class byte : unsigned char {};
76
77 template<typename _IntegerType> struct __byte_operand { };
78 template<> struct __byte_operand<bool> { using __type = byte; };
79 template<> struct __byte_operand<char> { using __type = byte; };
80 template<> struct __byte_operand<signed char> { using __type = byte; };
81 template<> struct __byte_operand<unsigned char> { using __type = byte; };
82 template<> struct __byte_operand<wchar_t> { using __type = byte; };
83#ifdef _GLIBCXX_USE_CHAR8_T
84 template<> struct __byte_operand<char8_t> { using __type = byte; };
85#endif
86 template<> struct __byte_operand<char16_t> { using __type = byte; };
87 template<> struct __byte_operand<char32_t> { using __type = byte; };
88 template<> struct __byte_operand<short> { using __type = byte; };
89 template<> struct __byte_operand<unsigned short> { using __type = byte; };
90 template<> struct __byte_operand<int> { using __type = byte; };
91 template<> struct __byte_operand<unsigned int> { using __type = byte; };
92 template<> struct __byte_operand<long> { using __type = byte; };
93 template<> struct __byte_operand<unsigned long> { using __type = byte; };
94 template<> struct __byte_operand<long long> { using __type = byte; };
95 template<> struct __byte_operand<unsigned long long> { using __type = byte; };
96#if defined(__GLIBCXX_TYPE_INT_N_0)
97 template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_0>
98 { using __type = byte; };
99 template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_0>
100 { using __type = byte; };
101#endif
102#if defined(__GLIBCXX_TYPE_INT_N_1)
103 template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_1>
104 { using __type = byte; };
105 template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_1>
106 { using __type = byte; };
107#endif
108#if defined(__GLIBCXX_TYPE_INT_N_2)
109 template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_2>
110 { using __type = byte; };
111 template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_2>
112 { using __type = byte; };
113#endif
114 template<typename _IntegerType>
115 struct __byte_operand<const _IntegerType>
116 : __byte_operand<_IntegerType> { };
117 template<typename _IntegerType>
118 struct __byte_operand<volatile _IntegerType>
119 : __byte_operand<_IntegerType> { };
120 template<typename _IntegerType>
121 struct __byte_operand<const volatile _IntegerType>
122 : __byte_operand<_IntegerType> { };
123
124 template<typename _IntegerType>
125 using __byte_op_t = typename __byte_operand<_IntegerType>::__type;
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 template<typename _IntegerType>
134 [[__gnu__::__always_inline__]]
135 constexpr __byte_op_t<_IntegerType>
136 operator>>(byte __b, _IntegerType __shift) noexcept
137 { return (byte)(unsigned char)((unsigned)__b >> __shift); }
138
139 [[__gnu__::__always_inline__]]
140 constexpr byte
141 operator|(byte __l, byte __r) noexcept
142 { return (byte)(unsigned char)((unsigned)__l | (unsigned)__r); }
143
144 [[__gnu__::__always_inline__]]
145 constexpr byte
146 operator&(byte __l, byte __r) noexcept
147 { return (byte)(unsigned char)((unsigned)__l & (unsigned)__r); }
148
149 [[__gnu__::__always_inline__]]
150 constexpr byte
151 operator^(byte __l, byte __r) noexcept
152 { return (byte)(unsigned char)((unsigned)__l ^ (unsigned)__r); }
153
154 [[__gnu__::__always_inline__]]
155 constexpr byte
156 operator~(byte __b) noexcept
157 { return (byte)(unsigned char)~(unsigned)__b; }
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 template<typename _IntegerType>
166 [[__gnu__::__always_inline__]]
167 constexpr __byte_op_t<_IntegerType>&
168 operator>>=(byte& __b, _IntegerType __shift) noexcept
169 { return __b = __b >> __shift; }
170
171 [[__gnu__::__always_inline__]]
172 constexpr byte&
173 operator|=(byte& __l, byte __r) noexcept
174 { return __l = __l | __r; }
175
176 [[__gnu__::__always_inline__]]
177 constexpr byte&
178 operator&=(byte& __l, byte __r) noexcept
179 { return __l = __l & __r; }
180
181 [[__gnu__::__always_inline__]]
182 constexpr byte&
183 operator^=(byte& __l, byte __r) noexcept
184 { return __l = __l ^ __r; }
185
186 template<typename _IntegerType>
187 [[nodiscard,__gnu__::__always_inline__]]
188 constexpr _IntegerType
189 to_integer(__byte_op_t<_IntegerType> __b) noexcept
190 { return _IntegerType(__b); }
191
192_GLIBCXX_END_NAMESPACE_VERSION
193} // namespace std
194#endif // __cpp_lib_byte
195} // extern "C++"
196
197#pragma GCC diagnostic pop
198
199#endif // _GLIBCXX_CSTDDEF
version.h
c++config.h
std
ISO C++ entities toplevel namespace is std.
std::operator^
constexpr bitset< _Nb > operator^(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
Definition bitset:1639
std::operator>>
std::basic_istream< _CharT, _Traits > & operator>>(std::basic_istream< _CharT, _Traits > &__is, bitset< _Nb > &__x)
Global I/O operators for bitsets.
Definition bitset:1659
std::operator<<
std::basic_ostream< _CharT, _Traits > & operator<<(std::basic_ostream< _CharT, _Traits > &__os, const bitset< _Nb > &__x)
Global I/O operators for bitsets.
Definition bitset:1755
std::operator|
constexpr bitset< _Nb > operator|(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
Definition bitset:1629
std::operator&
constexpr bitset< _Nb > operator&(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
Definition bitset:1619