libstdc++-v3/src/c++11/compatibility-c++0x.cc

   1 // Compatibility symbols for previous versions, C++0x bits -*- C++ -*-
   2
   3 // Copyright (C) 2009-2018 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 #define _GLIBCXX_COMPATIBILITY_CXX0X
  26 #define _GLIBCXX_USE_CXX11_ABI 0
  27 #define error_category error_categoryxx
  28 #define system_category system_categoryxx
  29 #define generic_category generic_categoryxx
  30 #define _V2 _V2xx
  31 #include <string>
  32 #include <system_error>
  33 #include <cstring>
  34 #undef error_category
  35 #undef system_category
  36 #undef generic_category
  37 #undef _V2
  38
  39 #if __cplusplus < 201103L
  40 # error "compatibility-c++0x.cc must be compiled with -std=gnu++0x"
  41 #endif
  42
  43 #ifdef _GLIBCXX_SHARED
  44
  45 namespace std _GLIBCXX_VISIBILITY(default)
  46 {
  47 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  48
  49   // gcc-4.4.0
  50   // <mutex> exported std::lock_error
  51 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
  52   class lock_error : public exception
  53   {
  54   public:
  55     virtual const char*
  56     _GLIBCXX_CONST what() const throw();
  57   };
  58
  59   const char*
  60   lock_error::what() const throw()
  61   { return "std::lock_error"; }
  62 #endif
  63
  64   // We need these due to the symbols exported since GLIBCXX_3.4.10.
  65   // See libstdc++/41662 for details.
  66
  67 #ifndef _GLIBCXX_LONG_DOUBLE_COMPAT_IMPL
  68   template<>
  69     struct hash<string>
  70     {
  71       size_t operator()(string) const;
  72     };
  73
  74   size_t
  75   hash<string>::operator()(string __s) const
  76   { return _Hash_impl::hash(__s.data(), __s.length()); }
  77
  78   template<>
  79     struct hash<const string&>
  80     {
  81       size_t operator()(const string&) const;
  82     };
  83
  84   size_t
  85   hash<const string&>::operator()(const string& __s) const
  86   { return _Hash_impl::hash(__s.data(), __s.length()); }
  87
  88 #ifdef _GLIBCXX_USE_WCHAR_T
  89   template<>
  90     struct hash<wstring>
  91     {
  92       size_t operator()(wstring) const;
  93     };
  94
  95   size_t
  96   hash<wstring>::operator()(wstring __s) const
  97   { return _Hash_impl::hash(__s.data(), __s.length() * sizeof(wchar_t)); }
  98
  99   template<>
 100     struct hash<const wstring&>
 101     {
 102       size_t operator()(const wstring&) const;
 103     };
 104
 105   size_t
 106   hash<const wstring&>::operator()(const wstring& __s) const
 107   { return _Hash_impl::hash(__s.data(), __s.length() * sizeof(wchar_t)); }
 108 #endif
 109 #endif
 110
 111   template<>
 112     struct hash<error_code>
 113     {
 114       size_t operator()(error_code) const;
 115     };
 116
 117   size_t
 118   hash<error_code>::operator()(error_code __e) const
 119   {
 120     const size_t __tmp = std::_Hash_impl::hash(__e._M_value);
 121     return std::_Hash_impl::__hash_combine(__e._M_cat, __tmp);
 122   }
 123
 124   // gcc-4.7.0
 125   // <chrono> changes is_monotonic to is_steady.
 126   namespace chrono
 127   {
 128     struct system_clock
 129     {
 130       static constexpr bool is_monotonic = false;
 131     };
 132     constexpr bool system_clock::is_monotonic;
 133   } // namespace chrono
 134
 135   // gcc-5 replaces this with _V2::error_category
 136   class error_category
 137   {
 138   public:
 139     error_category() noexcept;
 140
 141     virtual ~error_category();
 142
 143     error_category(const error_category&) = delete;
 144     error_category& operator=(const error_category&) = delete;
 145
 146     virtual const char*
 147     name() const noexcept = 0;
 148
 149     virtual string
 150     message(int) const = 0;
 151
 152     virtual error_condition
 153     default_error_condition(int __i) const noexcept;
 154
 155     virtual bool
 156     equivalent(int __i, const error_condition& __cond) const noexcept;
 157
 158     virtual bool
 159     equivalent(const error_code& __code, int __i) const noexcept;
 160
 161     bool
 162     operator<(const error_category& __other) const noexcept
 163     { return less<const error_category*>()(this, &__other); }
 164
 165     bool
 166     operator==(const error_category& __other) const noexcept
 167     { return this == &__other; }
 168
 169     bool
 170     operator!=(const error_category& __other) const noexcept
 171     { return this != &__other; }
 172   };
 173
 174   // gcc-4.9.0
 175   // LWG 2145 changes this constructor to constexpr i.e. inline
 176   error_category::error_category() noexcept = default;
 177
 178   error_category::~error_category() noexcept = default;
 179
 180   namespace
 181   {
 182     using std::string;
 183
 184     struct generic_error_category : public std::error_category
 185     {
 186       virtual const char*
 187       name() const noexcept
 188       { return "generic"; }
 189
 190       virtual string
 191       message(int i) const
 192       {
 193         // XXX locale issues: how does one get or set loc.
 194         // _GLIBCXX_HAVE_STRERROR_L, strerror_l(i, cloc)
 195         return string(strerror(i));
 196       }
 197     };
 198
 199     struct system_error_category : public std::error_category
 200     {
 201       virtual const char*
 202       name() const noexcept
 203       { return "system"; }
 204
 205       virtual string
 206       message(int i) const
 207       {
 208         // XXX locale issues: how does one get or set loc.
 209         // _GLIBCXX_HAVE_STRERROR_L, strerror_l(i, cloc)
 210         return string(strerror(i));
 211       }
 212     };
 213
 214     const generic_error_category generic_category_instance{};
 215     const system_error_category system_category_instance{};
 216   }
 217
 218   const error_category&
 219   system_category() noexcept { return system_category_instance; }
 220
 221   const error_category&
 222   generic_category() noexcept { return generic_category_instance; }
 223
 224   namespace _V2
 225   {
 226     _GLIBCXX_CONST const error_categoryxx& system_category() noexcept;
 227     _GLIBCXX_CONST const error_categoryxx& generic_category() noexcept;
 228   }
 229
 230   error_condition
 231   error_category::default_error_condition(int __i) const noexcept
 232   {
 233     if (*this == system_category())
 234       return error_condition(__i, _V2::system_category());
 235     return error_condition(__i, _V2::generic_category());
 236   }
 237
 238   bool
 239   error_category::equivalent(int __i,
 240                              const error_condition& __cond) const noexcept
 241   { return default_error_condition(__i) == __cond; }
 242
 243   bool
 244   error_category::equivalent(const error_code& __code, int __i) const noexcept
 245   {
 246     if (*this == system_category()
 247         && __code.category() == _V2::system_category())
 248       return __code.value() == __i;
 249     if (*this == generic_category()
 250         && __code.category() == _V2::generic_category())
 251       return __code.value() == __i;
 252     return false;
 253   }
 254
 255 _GLIBCXX_END_NAMESPACE_VERSION
 256 }
 257 #endif