1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // XFAIL: libcpp-no-exceptions
11 // UNSUPPORTED: libcpp-has-no-threads
12 // UNSUPPORTED: c++98, c++03
13 
14 // <future>
15 
16 // class promise<R>
17 
18 // future<R> get_future();
19 
20 #include <future>
21 #include <cassert>
22 
23 int main()
24 {
25     {
26         std::promise<double> p;
27         std::future<double> f = p.get_future();
28         p.set_value(105.5);
29         assert(f.get() == 105.5);
30     }
31     {
32         std::promise<double> p;
33         std::future<double> f = p.get_future();
34         try
35         {
36             f = p.get_future();
37             assert(false);
38         }
39         catch (const std::future_error& e)
40         {
41             assert(e.code() ==  make_error_code(std::future_errc::future_already_retrieved));
42         }
43     }
44     {
45         std::promise<double> p;
46         std::promise<double> p0 = std::move(p);
47         try
48         {
49             std::future<double> f = p.get_future();
50             assert(false);
51         }
52         catch (const std::future_error& e)
53         {
54             assert(e.code() ==  make_error_code(std::future_errc::no_state));
55         }
56     }
57 }
58