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*
name() const28     future_error_category::name() const BOOST_NOEXCEPT
29     {
30         return "future";
31     }
32 
33     std::string
message(int ev) const34     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&
future_category()57   future_category() BOOST_NOEXCEPT
58   {
59       return thread_detail::future_error_category_var;
60   }
61 
62 }
63 #endif
64 
65