libstdc++-v3/include/c_global/cstddef

   1 // -*- C++ -*- forwarding header.
   2
   3 // Copyright (C) 1997-2023 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 #define __glibcxx_want_byte
  53 #include <bits/version.h>
  54
  55 extern "C++"
  56 {
  57 #if __cplusplus >= 201103L
  58 namespace std
  59 {
  60   // We handle size_t, ptrdiff_t, and nullptr_t in c++config.h.
  61   using ::max_align_t;
  62 }
  63 #endif // C++11
  64
  65 #ifdef __cpp_lib_byte // C++ >= 17
  66 namespace std
  67 {
  68 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  69   /// std::byte
  70   enum class byte : unsigned char {};
  71
  72   template<typename _IntegerType> struct __byte_operand { };
  73   template<> struct __byte_operand<bool> { using __type = byte; };
  74   template<> struct __byte_operand<char> { using __type = byte; };
  75   template<> struct __byte_operand<signed char> { using __type = byte; };
  76   template<> struct __byte_operand<unsigned char> { using __type = byte; };
  77   template<> struct __byte_operand<wchar_t> { using __type = byte; };
  78 #ifdef _GLIBCXX_USE_CHAR8_T
  79   template<> struct __byte_operand<char8_t> { using __type = byte; };
  80 #endif
  81   template<> struct __byte_operand<char16_t> { using __type = byte; };
  82   template<> struct __byte_operand<char32_t> { using __type = byte; };
  83   template<> struct __byte_operand<short> { using __type = byte; };
  84   template<> struct __byte_operand<unsigned short> { using __type = byte; };
  85   template<> struct __byte_operand<int> { using __type = byte; };
  86   template<> struct __byte_operand<unsigned int> { using __type = byte; };
  87   template<> struct __byte_operand<long> { using __type = byte; };
  88   template<> struct __byte_operand<unsigned long> { using __type = byte; };
  89   template<> struct __byte_operand<long long> { using __type = byte; };
  90   template<> struct __byte_operand<unsigned long long> { using __type = byte; };
  91 #if defined(__GLIBCXX_TYPE_INT_N_0)
  92   template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_0>
  93   { using __type = byte; };
  94   template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_0>
  95   { using __type = byte; };
  96 #endif
  97 #if defined(__GLIBCXX_TYPE_INT_N_1)
  98   template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_1>
  99   { using __type = byte; };
 100   template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_1>
 101   { using __type = byte; };
 102 #endif
 103 #if defined(__GLIBCXX_TYPE_INT_N_2)
 104   template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_2>
 105   { using __type = byte; };
 106   template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_2>
 107   { using __type = byte; };
 108 #endif
 109   template<typename _IntegerType>
 110     struct __byte_operand<const _IntegerType>
 111     : __byte_operand<_IntegerType> { };
 112   template<typename _IntegerType>
 113     struct __byte_operand<volatile _IntegerType>
 114     : __byte_operand<_IntegerType> { };
 115   template<typename _IntegerType>
 116     struct __byte_operand<const volatile _IntegerType>
 117     : __byte_operand<_IntegerType> { };
 118
 119   template<typename _IntegerType>
 120     using __byte_op_t = typename __byte_operand<_IntegerType>::__type;
 121
 122   template<typename _IntegerType>
 123     [[__gnu__::__always_inline__]]
 124     constexpr __byte_op_t<_IntegerType>
 125     operator<<(byte __b, _IntegerType __shift) noexcept
 126     { return (byte)(unsigned char)((unsigned)__b << __shift); }
 127
 128   template<typename _IntegerType>
 129     [[__gnu__::__always_inline__]]
 130     constexpr __byte_op_t<_IntegerType>
 131     operator>>(byte __b, _IntegerType __shift) noexcept
 132     { return (byte)(unsigned char)((unsigned)__b >> __shift); }
 133
 134   [[__gnu__::__always_inline__]]
 135   constexpr byte
 136   operator|(byte __l, byte __r) noexcept
 137   { return (byte)(unsigned char)((unsigned)__l | (unsigned)__r); }
 138
 139   [[__gnu__::__always_inline__]]
 140   constexpr byte
 141   operator&(byte __l, byte __r) noexcept
 142   { return (byte)(unsigned char)((unsigned)__l & (unsigned)__r); }
 143
 144   [[__gnu__::__always_inline__]]
 145   constexpr byte
 146   operator^(byte __l, byte __r) noexcept
 147   { return (byte)(unsigned char)((unsigned)__l ^ (unsigned)__r); }
 148
 149   [[__gnu__::__always_inline__]]
 150   constexpr byte
 151   operator~(byte __b) noexcept
 152   { return (byte)(unsigned char)~(unsigned)__b; }
 153
 154   template<typename _IntegerType>
 155     [[__gnu__::__always_inline__]]
 156     constexpr __byte_op_t<_IntegerType>&
 157     operator<<=(byte& __b, _IntegerType __shift) noexcept
 158     { return __b = __b << __shift; }
 159
 160   template<typename _IntegerType>
 161     [[__gnu__::__always_inline__]]
 162     constexpr __byte_op_t<_IntegerType>&
 163     operator>>=(byte& __b, _IntegerType __shift) noexcept
 164     { return __b = __b >> __shift; }
 165
 166   [[__gnu__::__always_inline__]]
 167   constexpr byte&
 168   operator|=(byte& __l, byte __r) noexcept
 169   { return __l = __l | __r; }
 170
 171   [[__gnu__::__always_inline__]]
 172   constexpr byte&
 173   operator&=(byte& __l, byte __r) noexcept
 174   { return __l = __l & __r; }
 175
 176   [[__gnu__::__always_inline__]]
 177   constexpr byte&
 178   operator^=(byte& __l, byte __r) noexcept
 179   { return __l = __l ^ __r; }
 180
 181   template<typename _IntegerType>
 182     [[nodiscard,__gnu__::__always_inline__]]
 183     constexpr _IntegerType
 184     to_integer(__byte_op_t<_IntegerType> __b) noexcept
 185     { return _IntegerType(__b); }
 186
 187 _GLIBCXX_END_NAMESPACE_VERSION
 188 } // namespace std
 189 #endif // __cpp_lib_byte
 190 } // extern "C++"
 191
 192 #endif // _GLIBCXX_CSTDDEF