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
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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  constexpr __byte_op_t<_IntegerType>
123  operator<<(byte __b, _IntegerType __shift) noexcept
124  { return (byte)(unsigned char)((unsigned)__b << __shift); }
125 
126  template<typename _IntegerType>
127  constexpr __byte_op_t<_IntegerType>
128  operator>>(byte __b, _IntegerType __shift) noexcept
129  { return (byte)(unsigned char)((unsigned)__b >> __shift); }
130 
131  constexpr byte
132  operator|(byte __l, byte __r) noexcept
133  { return (byte)(unsigned char)((unsigned)__l | (unsigned)__r); }
134 
135  constexpr byte
136  operator&(byte __l, byte __r) noexcept
137  { return (byte)(unsigned char)((unsigned)__l & (unsigned)__r); }
138 
139  constexpr byte
140  operator^(byte __l, byte __r) noexcept
141  { return (byte)(unsigned char)((unsigned)__l ^ (unsigned)__r); }
142 
143  constexpr byte
144  operator~(byte __b) noexcept
145  { return (byte)(unsigned char)~(unsigned)__b; }
146 
147  template<typename _IntegerType>
148  constexpr __byte_op_t<_IntegerType>&
149  operator<<=(byte& __b, _IntegerType __shift) noexcept
150  { return __b = __b << __shift; }
151 
152  template<typename _IntegerType>
153  constexpr __byte_op_t<_IntegerType>&
154  operator>>=(byte& __b, _IntegerType __shift) noexcept
155  { return __b = __b >> __shift; }
156 
157  constexpr byte&
158  operator|=(byte& __l, byte __r) noexcept
159  { return __l = __l | __r; }
160 
161  constexpr byte&
162  operator&=(byte& __l, byte __r) noexcept
163  { return __l = __l & __r; }
164 
165  constexpr byte&
166  operator^=(byte& __l, byte __r) noexcept
167  { return __l = __l ^ __r; }
168 
169  template<typename _IntegerType>
170  [[nodiscard]]
171  constexpr _IntegerType
172  to_integer(__byte_op_t<_IntegerType> __b) noexcept
173  { return _IntegerType(__b); }
174 
175 _GLIBCXX_END_NAMESPACE_VERSION
176 } // namespace std
177 #endif // C++17
178 } // extern "C++"
179 
180 #endif // _GLIBCXX_CSTDDEF