ceph/src/boost/libs/thread/src/future.cpp

   1 // (C) Copyright 2012 Vicente J. Botet Escriba
   2 // Use, modification and distribution are subject to the
   3 // Boost Software License, Version 1.0. (See accompanying file
   4 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #include <boost/thread/detail/config.hpp>
   7
   8 #ifndef BOOST_NO_EXCEPTIONS
   9
  10 #include <boost/thread/futures/future_error_code.hpp>
  11 #include <string>
  12
  13 namespace boost
  14 {
  15
  16   namespace thread_detail
  17   {
  18
  19     class  future_error_category :
  20       public boost::system::error_category
  21     {
  22     public:
  23         virtual const char* name() const BOOST_NOEXCEPT;
  24         virtual std::string message(int ev) const;
  25     };
  26
  27     const char*
  28     future_error_category::name() const BOOST_NOEXCEPT
  29     {
  30         return "future";
  31     }
  32
  33     std::string
  34     future_error_category::message(int ev) const
  35     {
  36         switch (BOOST_SCOPED_ENUM_NATIVE(future_errc)(ev))
  37         {
  38         case future_errc::broken_promise:
  39             return std::string("The associated promise has been destructed prior "
  40                           "to the associated state becoming ready.");
  41         case future_errc::future_already_retrieved:
  42             return std::string("The future has already been retrieved from "
  43                           "the promise or packaged_task.");
  44         case future_errc::promise_already_satisfied:
  45             return std::string("The state of the promise has already been set.");
  46         case future_errc::no_state:
  47             return std::string("Operation not permitted on an object without "
  48                           "an associated state.");
  49         }
  50         return std::string("unspecified future_errc value\n");
  51     }
  52     future_error_category future_error_category_var;
  53   }
  54
  55   BOOST_THREAD_DECL
  56   const system::error_category&
  57   future_category() BOOST_NOEXCEPT
  58   {
  59       return thread_detail::future_error_category_var;
  60   }
  61
  62 }
  63 #endif
  64