libstdc++
cstddef
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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
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 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