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

   1 // Compatibility symbols for previous versions, C++0x bits -*- C++ -*-
   2
   3 // Copyright (C) 2009 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 #include <cstddef>
  26 #include <string>
  27 #include <cmath>
  28 #include <system_error>
  29
  30 #ifndef __GXX_EXPERIMENTAL_CXX0X__
  31 # error "compatibility-c++0x.cc must be compiled with -std=gnu++0x"
  32 #endif
  33
  34 namespace std
  35 {
  36   // gcc-4.4.0
  37   // <mutex> exported std::lock_error
  38 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
  39   class lock_error : public exception
  40   {
  41   public:
  42     virtual const char*
  43     _GLIBCXX_CONST what() const throw();
  44   };
  45
  46   const char*
  47   lock_error::what() const throw()
  48   { return "std::lock_error"; }
  49 #endif
  50
  51   // We need these due to the symbols exported since GLIBCXX_3.4.10.
  52   // See libstdc++/41662 for details.
  53   template<typename _Tp>
  54     struct hash : public std::unary_function<_Tp, size_t>
  55     {
  56       size_t
  57       operator()(_Tp __val) const;
  58     };
  59
  60   /// Dummy generic implementation (for sizeof(size_t) != 4, 8).
  61   template<size_t = sizeof(size_t)>
  62     struct _Fnv_hash
  63     {
  64       static size_t
  65       hash(const char* __first, size_t __length)
  66       {
  67         size_t __result = 0;
  68         for (; __length > 0; --__length)
  69           __result = (__result * 131) + *__first++;
  70         return __result;
  71       }
  72     };
  73
  74   template<>
  75     struct _Fnv_hash<4>
  76     {
  77       static size_t
  78       hash(const char* __first, size_t __length)
  79       {
  80         size_t __result = static_cast<size_t>(2166136261UL);
  81         for (; __length > 0; --__length)
  82           {
  83             __result ^= static_cast<size_t>(*__first++);
  84             __result *= static_cast<size_t>(16777619UL);
  85           }
  86         return __result;
  87       }
  88     };
  89
  90   template<>
  91     struct _Fnv_hash<8>
  92     {
  93       static size_t
  94       hash(const char* __first, size_t __length)
  95       {
  96         size_t __result =
  97           static_cast<size_t>(14695981039346656037ULL);
  98         for (; __length > 0; --__length)
  99           {
 100             __result ^= static_cast<size_t>(*__first++);
 101             __result *= static_cast<size_t>(1099511628211ULL);
 102           }
 103         return __result;
 104       }
 105     };
 106
 107 #include "hash.cc"
 108
 109   template<>
 110     size_t
 111     hash<error_code>::operator()(error_code __e) const
 112     {
 113       const char* __p = reinterpret_cast<const char*>(&__e);
 114       return _Fnv_hash<>::hash(__p, sizeof(__e));
 115     }
 116 }