text: // (C) Copyright 2012 Vicente J. Botet Escriba
  // Use, modification and distribution are subject to the
  // Boost Software License, Version 1.0. (See accompanying file
  // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  
  #include <boost/thread/detail/config.hpp>
  #ifndef BOOST_NO_EXCEPTIONS
  
  
  #include <boost/thread/future_error_code.hpp>
  
  namespace boost
  {
  
    namespace thread_detail
    {
  
      class  future_error_category :
        public boost::system::error_category
      {
      public:
          virtual const char* name() const BOOST_NOEXCEPT;
          virtual std::string message(int ev) const;
      };
  
      const char*
      future_error_category::name() const BOOST_NOEXCEPT
      {
          return "future";
      }
  
      std::string
      future_error_category::message(int ev) const
      {
          switch (BOOST_SCOPED_ENUM_NATIVE(future_errc)(ev))
          {
          case future_errc::broken_promise:
              return std::string("The associated promise has been destructed prior "
                            "to the associated state becoming ready.");
          case future_errc::future_already_retrieved:
              return std::string("The future has already been retrieved from "
                            "the promise or packaged_task.");
          case future_errc::promise_already_satisfied:
              return std::string("The state of the promise has already been set.");
          case future_errc::no_state:
              return std::string("Operation not permitted on an object without "
                            "an associated state.");
          }
          return std::string("unspecified future_errc value\n");
      }
      future_error_category future_error_category_var;
    }
  
    BOOST_THREAD_DECL
    const system::error_category&
    future_category() BOOST_NOEXCEPT
    {
        return thread_detail::future_error_category_var;
    }
  
  }
  #endif
  
  