libstdc++
cstddef
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1// -*- C++ -*- forwarding header.
2
3// Copyright (C) 1997-2022 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
52extern "C++"
53{
54#if __cplusplus >= 201103L
55namespace 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
63namespace 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