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 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     [[__gnu__::__always_inline__]]
 123     constexpr __byte_op_t<_IntegerType>
 124     operator<<(byte __b, _IntegerType __shift) noexcept
 125     { return (byte)(unsigned char)((unsigned)__b << __shift); }
 126
 127   template<typename _IntegerType>
 128     [[__gnu__::__always_inline__]]
 129     constexpr __byte_op_t<_IntegerType>
 130     operator>>(byte __b, _IntegerType __shift) noexcept
 131     { return (byte)(unsigned char)((unsigned)__b >> __shift); }
 132
 133   [[__gnu__::__always_inline__]]
 134   constexpr byte
 135   operator|(byte __l, byte __r) noexcept
 136   { return (byte)(unsigned char)((unsigned)__l | (unsigned)__r); }
 137
 138   [[__gnu__::__always_inline__]]
 139   constexpr byte
 140   operator&(byte __l, byte __r) noexcept
 141   { return (byte)(unsigned char)((unsigned)__l & (unsigned)__r); }
 142
 143   [[__gnu__::__always_inline__]]
 144   constexpr byte
 145   operator^(byte __l, byte __r) noexcept
 146   { return (byte)(unsigned char)((unsigned)__l ^ (unsigned)__r); }
 147
 148   [[__gnu__::__always_inline__]]
 149   constexpr byte
 150   operator~(byte __b) noexcept
 151   { return (byte)(unsigned char)~(unsigned)__b; }
 152
 153   template<typename _IntegerType>
 154     [[__gnu__::__always_inline__]]
 155     constexpr __byte_op_t<_IntegerType>&
 156     operator<<=(byte& __b, _IntegerType __shift) noexcept
 157     { return __b = __b << __shift; }
 158
 159   template<typename _IntegerType>
 160     [[__gnu__::__always_inline__]]
 161     constexpr __byte_op_t<_IntegerType>&
 162     operator>>=(byte& __b, _IntegerType __shift) noexcept
 163     { return __b = __b >> __shift; }
 164
 165   [[__gnu__::__always_inline__]]
 166   constexpr byte&
 167   operator|=(byte& __l, byte __r) noexcept
 168   { return __l = __l | __r; }
 169
 170   [[__gnu__::__always_inline__]]
 171   constexpr byte&
 172   operator&=(byte& __l, byte __r) noexcept
 173   { return __l = __l & __r; }
 174
 175   [[__gnu__::__always_inline__]]
 176   constexpr byte&
 177   operator^=(byte& __l, byte __r) noexcept
 178   { return __l = __l ^ __r; }
 179
 180   template<typename _IntegerType>
 181     [[nodiscard,__gnu__::__always_inline__]]
 182     constexpr _IntegerType
 183     to_integer(__byte_op_t<_IntegerType> __b) noexcept
 184     { return _IntegerType(__b); }
 185
 186 _GLIBCXX_END_NAMESPACE_VERSION
 187 } // namespace std
 188 #endif // C++17
 189 } // extern "C++"
 190
 191 #endif // _GLIBCXX_CSTDDEF