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

   1 // Compatibility symbols for previous versions, C++0x bits -*- C++ -*-
   2
   3 // Copyright (C) 2009, 2010, 2011 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 #include <string>
  27 #include <system_error>
  28
  29 #ifndef __GXX_EXPERIMENTAL_CXX0X__
  30 # error "compatibility-c++0x.cc must be compiled with -std=gnu++0x"
  31 #endif
  32
  33 namespace std _GLIBCXX_VISIBILITY(default)
  34 {
  35   // gcc-4.4.0
  36   // <mutex> exported std::lock_error
  37 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
  38   class lock_error : public exception
  39   {
  40   public:
  41     virtual const char*
  42     _GLIBCXX_CONST what() const throw();
  43   };
  44
  45   const char*
  46   lock_error::what() const throw()
  47   { return "std::lock_error"; }
  48 #endif
  49
  50   // We need these due to the symbols exported since GLIBCXX_3.4.10.
  51   // See libstdc++/41662 for details.
  52
  53 #ifndef _GLIBCXX_LONG_DOUBLE_COMPAT_IMPL
  54   template<>
  55     struct hash<string>
  56     {
  57       size_t operator()(string) const;
  58     };
  59
  60   size_t
  61   hash<string>::operator()(string __s) const
  62   { return _Hash_impl::hash(__s.data(), __s.length()); }
  63
  64   template<>
  65     struct hash<const string&>
  66     {
  67       size_t operator()(const string&) const;
  68     };
  69
  70   size_t
  71   hash<const string&>::operator()(const string& __s) const
  72   { return _Hash_impl::hash(__s.data(), __s.length()); }
  73
  74 #ifdef _GLIBCXX_USE_WCHAR_T
  75   template<>
  76     struct hash<wstring>
  77     {
  78       size_t operator()(wstring) const;
  79     };
  80
  81   size_t
  82   hash<wstring>::operator()(wstring __s) const
  83   { return _Hash_impl::hash(__s.data(), __s.length() * sizeof(wchar_t)); }
  84
  85   template<>
  86     struct hash<const wstring&>
  87     {
  88       size_t operator()(const wstring&) const;
  89     };
  90
  91   size_t
  92   hash<const wstring&>::operator()(const wstring& __s) const
  93   { return _Hash_impl::hash(__s.data(), __s.length() * sizeof(wchar_t)); }
  94 #endif
  95 #endif
  96
  97   template<>
  98     struct hash<error_code>
  99     {
 100       size_t operator()(error_code) const;
 101     };
 102
 103   size_t
 104   hash<error_code>::operator()(error_code __e) const
 105   {
 106     const size_t __tmp = std::_Hash_impl::hash(__e._M_value);
 107     return std::_Hash_impl::__hash_combine(__e._M_cat, __tmp);
 108   }
 109
 110   // gcc-4.7.0
 111   // <chrono> changes is_monotonic to is_steady.
 112   namespace chrono
 113   {
 114     struct system_clock
 115     {
 116       static constexpr bool is_monotonic = false;
 117     };
 118     constexpr bool system_clock::is_monotonic;
 119   } // namespace chrono
 120 }
 121