libstdc++-v3/src/c++11/future.cc

   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