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

   1 // Compatibility symbols for previous versions, C++0x bits -*- C++ -*-
   2
   3 // Copyright (C) 2009-2017 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   // gcc-4.4.0
  48   // <mutex> exported std::lock_error
  49 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
  50   class lock_error : public exception
  51   {
  52   public:
  53     virtual const char*
  54     _GLIBCXX_CONST what() const throw();
  55   };
  56
  57   const char*
  58   lock_error::what() const throw()
  59   { return "std::lock_error"; }
  60 #endif
  61
  62   // We need these due to the symbols exported since GLIBCXX_3.4.10.
  63   // See libstdc++/41662 for details.
  64
  65 #ifndef _GLIBCXX_LONG_DOUBLE_COMPAT_IMPL
  66   template<>
  67     struct hash<string>
  68     {
  69       size_t operator()(string) const;
  70     };
  71
  72   size_t
  73   hash<string>::operator()(string __s) const
  74   { return _Hash_impl::hash(__s.data(), __s.length()); }
  75
  76   template<>
  77     struct hash<const string&>
  78     {
  79       size_t operator()(const string&) const;
  80     };
  81
  82   size_t
  83   hash<const string&>::operator()(const string& __s) const
  84   { return _Hash_impl::hash(__s.data(), __s.length()); }
  85
  86 #ifdef _GLIBCXX_USE_WCHAR_T
  87   template<>
  88     struct hash<wstring>
  89     {
  90       size_t operator()(wstring) const;
  91     };
  92
  93   size_t
  94   hash<wstring>::operator()(wstring __s) const
  95   { return _Hash_impl::hash(__s.data(), __s.length() * sizeof(wchar_t)); }
  96
  97   template<>
  98     struct hash<const wstring&>
  99     {
 100       size_t operator()(const wstring&) const;
 101     };
 102
 103   size_t
 104   hash<const wstring&>::operator()(const wstring& __s) const
 105   { return _Hash_impl::hash(__s.data(), __s.length() * sizeof(wchar_t)); }
 106 #endif
 107 #endif
 108
 109   template<>
 110     struct hash<error_code>
 111     {
 112       size_t operator()(error_code) const;
 113     };
 114
 115   size_t
 116   hash<error_code>::operator()(error_code __e) const
 117   {
 118     const size_t __tmp = std::_Hash_impl::hash(__e._M_value);
 119     return std::_Hash_impl::__hash_combine(__e._M_cat, __tmp);
 120   }
 121
 122   // gcc-4.7.0
 123   // <chrono> changes is_monotonic to is_steady.
 124   namespace chrono
 125   {
 126     struct system_clock
 127     {
 128       static constexpr bool is_monotonic = false;
 129     };
 130     constexpr bool system_clock::is_monotonic;
 131   } // namespace chrono
 132
 133 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 134   // gcc-5 replaces this with _V2::error_category
 135   class error_category
 136   {
 137   public:
 138     error_category() noexcept;
 139
 140     virtual ~error_category();
 141
 142     error_category(const error_category&) = delete;
 143     error_category& operator=(const error_category&) = delete;
 144
 145     virtual const char*
 146     name() const noexcept = 0;
 147
 148     virtual string
 149     message(int) const = 0;
 150
 151     virtual error_condition
 152     default_error_condition(int __i) const noexcept;
 153
 154     virtual bool
 155     equivalent(int __i, const error_condition& __cond) const noexcept;
 156
 157     virtual bool
 158     equivalent(const error_code& __code, int __i) const noexcept;
 159
 160     bool
 161     operator<(const error_category& __other) const noexcept
 162     { return less<const error_category*>()(this, &__other); }
 163
 164     bool
 165     operator==(const error_category& __other) const noexcept
 166     { return this == &__other; }
 167
 168     bool
 169     operator!=(const error_category& __other) const noexcept
 170     { return this != &__other; }
 171   };
 172 _GLIBCXX_END_NAMESPACE_VERSION
 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 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 219   const error_category&
 220   system_category() noexcept { return system_category_instance; }
 221
 222   const error_category&
 223   generic_category() noexcept { return generic_category_instance; }
 224
 225   namespace _V2
 226   {
 227     _GLIBCXX_CONST const error_categoryxx& system_category() noexcept;
 228     _GLIBCXX_CONST const error_categoryxx& generic_category() noexcept;
 229   }
 230 _GLIBCXX_END_NAMESPACE_VERSION
 231
 232   error_condition
 233   error_category::default_error_condition(int __i) const noexcept
 234   {
 235     if (*this == system_category())
 236       return error_condition(__i, _V2::system_category());
 237     return error_condition(__i, _V2::generic_category());
 238   }
 239
 240   bool
 241   error_category::equivalent(int __i,
 242                              const error_condition& __cond) const noexcept
 243   { return default_error_condition(__i) == __cond; }
 244
 245   bool
 246   error_category::equivalent(const error_code& __code, int __i) const noexcept
 247   {
 248     if (*this == system_category()
 249         && __code.category() == _V2::system_category())
 250       return __code.value() == __i;
 251     if (*this == generic_category()
 252         && __code.category() == _V2::generic_category())
 253       return __code.value() == __i;
 254     return false;
 255   }
 256
 257 }
 258 #endif