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  1. // future -*- C++ -*-
  2.  
  3. // Copyright (C) 2009-2013 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 <future>
  26.  
  27. namespace
  28. {
  29.   struct future_error_category : public std::error_category
  30.   {
  31.     virtual const char*
  32.     name() const noexcept
  33.     { return "future"; }
  34.  
  35.     virtual std::string message(int __ec) const
  36.     {
  37.       std::string __msg;
  38.       switch (std::future_errc(__ec))
  39.       {
  40.       case std::future_errc::broken_promise:
  41.           __msg = "Broken promise";
  42.           break;
  43.       case std::future_errc::future_already_retrieved:
  44.           __msg = "Future already retrieved";
  45.           break;
  46.       case std::future_errc::promise_already_satisfied:
  47.           __msg = "Promise already satisfied";
  48.           break;
  49.       case std::future_errc::no_state:
  50.           __msg = "No associated state";
  51.           break;
  52.       default:
  53.           __msg = "Unknown error";
  54.           break;
  55.       }
  56.       return __msg;
  57.     }
  58.   };
  59.  
  60.   const future_error_category&
  61.   __future_category_instance() noexcept
  62.   {
  63.     static const future_error_category __fec{};
  64.     return __fec;
  65.   }
  66. }
  67.  
  68. namespace std _GLIBCXX_VISIBILITY(default)
  69. {
  70. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  71.  
  72.   const error_category& future_category() noexcept
  73.   { return __future_category_instance(); }
  74.  
  75.   future_error::~future_error() noexcept { }
  76.  
  77.   const char*
  78.   future_error::what() const noexcept { return _M_code.message().c_str(); }
  79.  
  80. #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) \
  81.   && (ATOMIC_INT_LOCK_FREE > 1)
  82.   __future_base::_Result_base::_Result_base() = default;
  83.  
  84.   __future_base::_Result_base::~_Result_base() = default;
  85.  
  86.   __future_base::_State_base::~_State_base() = default;
  87. #endif
  88.  
  89. _GLIBCXX_END_NAMESPACE_VERSION
  90. } // namespace std
  91.