libstdc++
cstddef
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1 // -*- C++ -*- forwarding header.
2 
3 // Copyright (C) 1997-2018 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 #if __cplusplus >= 201103L
53 namespace std
54 {
55  // We handle size_t, ptrdiff_t, and nullptr_t in c++config.h.
56  using ::max_align_t;
57 }
58 #endif
59 
60 #if __cplusplus >= 201703L
61 namespace std
62 {
63 #define __cpp_lib_byte 201603
64 
65  /// std::byte
66  enum class byte : unsigned char {};
67 
68  template<typename _IntegerType> struct __byte_operand { };
69  template<> struct __byte_operand<bool> { using __type = byte; };
70  template<> struct __byte_operand<char> { using __type = byte; };
71  template<> struct __byte_operand<signed char> { using __type = byte; };
72  template<> struct __byte_operand<unsigned char> { using __type = byte; };
73 #ifdef _GLIBCXX_USE_WCHAR_T
74  template<> struct __byte_operand<wchar_t> { using __type = byte; };
75 #endif
76  template<> struct __byte_operand<char16_t> { using __type = byte; };
77  template<> struct __byte_operand<char32_t> { using __type = byte; };
78  template<> struct __byte_operand<short> { using __type = byte; };
79  template<> struct __byte_operand<unsigned short> { using __type = byte; };
80  template<> struct __byte_operand<int> { using __type = byte; };
81  template<> struct __byte_operand<unsigned int> { using __type = byte; };
82  template<> struct __byte_operand<long> { using __type = byte; };
83  template<> struct __byte_operand<unsigned long> { using __type = byte; };
84  template<> struct __byte_operand<long long> { using __type = byte; };
85  template<> struct __byte_operand<unsigned long long> { using __type = byte; };
86 #if defined(__GLIBCXX_TYPE_INT_N_0)
87  template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_0>
88  { using __type = byte; };
89  template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_0>
90  { using __type = byte; };
91 #endif
92 #if defined(__GLIBCXX_TYPE_INT_N_1)
93  template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_1>
94  { using __type = byte; };
95  template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_1>
96  { using __type = byte; };
97 #endif
98 #if defined(__GLIBCXX_TYPE_INT_N_2)
99  template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_2>
100  { using __type = byte; };
101  template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_2>
102  { using __type = byte; };
103 #endif
104  template<typename _IntegerType>
105  struct __byte_operand<const _IntegerType>
106  : __byte_operand<_IntegerType> { };
107  template<typename _IntegerType>
108  struct __byte_operand<volatile _IntegerType>
109  : __byte_operand<_IntegerType> { };
110  template<typename _IntegerType>
111  struct __byte_operand<const volatile _IntegerType>
112  : __byte_operand<_IntegerType> { };
113 
114  template<typename _IntegerType>
115  using __byte_op_t = typename __byte_operand<_IntegerType>::__type;
116 
117  template<typename _IntegerType>
118  constexpr __byte_op_t<_IntegerType>&
119  operator<<=(byte& __b, _IntegerType __shift) noexcept
120  { return __b = byte(static_cast<unsigned char>(__b) << __shift); }
121 
122  template<typename _IntegerType>
123  constexpr __byte_op_t<_IntegerType>
124  operator<<(byte __b, _IntegerType __shift) noexcept
125  { return byte(static_cast<unsigned char>(__b) << __shift); }
126 
127  template<typename _IntegerType>
128  constexpr __byte_op_t<_IntegerType>&
129  operator>>=(byte& __b, _IntegerType __shift) noexcept
130  { return __b = byte(static_cast<unsigned char>(__b) >> __shift); }
131 
132  template<typename _IntegerType>
133  constexpr __byte_op_t<_IntegerType>
134  operator>>(byte __b, _IntegerType __shift) noexcept
135  { return byte(static_cast<unsigned char>(__b) >> __shift); }
136 
137  constexpr byte&
138  operator|=(byte& __l, byte __r) noexcept
139  {
140  return __l =
141  byte(static_cast<unsigned char>(__l) | static_cast<unsigned char>(__r));
142  }
143 
144  constexpr byte
145  operator|(byte __l, byte __r) noexcept
146  {
147  return
148  byte(static_cast<unsigned char>(__l) | static_cast<unsigned char>(__r));
149  }
150 
151  constexpr byte&
152  operator&=(byte& __l, byte __r) noexcept
153  {
154  return __l =
155  byte(static_cast<unsigned char>(__l) & static_cast<unsigned char>(__r));
156  }
157 
158  constexpr byte
159  operator&(byte __l, byte __r) noexcept
160  {
161  return
162  byte(static_cast<unsigned char>(__l) & static_cast<unsigned char>(__r));
163  }
164 
165  constexpr byte&
166  operator^=(byte& __l, byte __r) noexcept
167  {
168  return __l =
169  byte(static_cast<unsigned char>(__l) ^ static_cast<unsigned char>(__r));
170  }
171 
172  constexpr byte
173  operator^(byte __l, byte __r) noexcept
174  {
175  return
176  byte(static_cast<unsigned char>(__l) ^ static_cast<unsigned char>(__r));
177  }
178 
179  constexpr byte
180  operator~(byte __b) noexcept
181  { return byte(~static_cast<unsigned char>(__b)); }
182 
183  template<typename _IntegerType>
184  constexpr _IntegerType
185  to_integer(__byte_op_t<_IntegerType> __b) noexcept
186  { return _IntegerType(__b); }
187 
188 } // namespace std
189 #endif
190 
191 #endif // _GLIBCXX_CSTDDEF