libstdc++
cstddef
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1 // -*- C++ -*- forwarding header.
2 
3 // Copyright (C) 1997-2019 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  constexpr __byte_op_t<_IntegerType>&
125  operator<<=(byte& __b, _IntegerType __shift) noexcept
126  { return __b = byte(static_cast<unsigned char>(__b) << __shift); }
127 
128  template<typename _IntegerType>
129  constexpr __byte_op_t<_IntegerType>
130  operator<<(byte __b, _IntegerType __shift) noexcept
131  { return byte(static_cast<unsigned char>(__b) << __shift); }
132 
133  template<typename _IntegerType>
134  constexpr __byte_op_t<_IntegerType>&
135  operator>>=(byte& __b, _IntegerType __shift) noexcept
136  { return __b = byte(static_cast<unsigned char>(__b) >> __shift); }
137 
138  template<typename _IntegerType>
139  constexpr __byte_op_t<_IntegerType>
140  operator>>(byte __b, _IntegerType __shift) noexcept
141  { return byte(static_cast<unsigned char>(__b) >> __shift); }
142 
143  constexpr byte&
144  operator|=(byte& __l, byte __r) noexcept
145  {
146  return __l =
147  byte(static_cast<unsigned char>(__l) | static_cast<unsigned char>(__r));
148  }
149 
150  constexpr byte
151  operator|(byte __l, byte __r) noexcept
152  {
153  return
154  byte(static_cast<unsigned char>(__l) | static_cast<unsigned char>(__r));
155  }
156 
157  constexpr byte&
158  operator&=(byte& __l, byte __r) noexcept
159  {
160  return __l =
161  byte(static_cast<unsigned char>(__l) & static_cast<unsigned char>(__r));
162  }
163 
164  constexpr byte
165  operator&(byte __l, byte __r) noexcept
166  {
167  return
168  byte(static_cast<unsigned char>(__l) & static_cast<unsigned char>(__r));
169  }
170 
171  constexpr byte&
172  operator^=(byte& __l, byte __r) noexcept
173  {
174  return __l =
175  byte(static_cast<unsigned char>(__l) ^ static_cast<unsigned char>(__r));
176  }
177 
178  constexpr byte
179  operator^(byte __l, byte __r) noexcept
180  {
181  return
182  byte(static_cast<unsigned char>(__l) ^ static_cast<unsigned char>(__r));
183  }
184 
185  constexpr byte
186  operator~(byte __b) noexcept
187  { return byte(~static_cast<unsigned char>(__b)); }
188 
189  template<typename _IntegerType>
190  constexpr _IntegerType
191  to_integer(__byte_op_t<_IntegerType> __b) noexcept
192  { return _IntegerType(__b); }
193 
194 _GLIBCXX_END_NAMESPACE_VERSION
195 } // namespace std
196 #endif // C++17
197 } // extern "C++"
198 
199 #endif // _GLIBCXX_CSTDDEF