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 // UNSUPPORTED: libcpp-has-no-threads
11 
12 // <future>
13 
14 // class promise<R>
15 
16 // void promise<void>::set_value();
17 
18 #include <future>
19 #include <cassert>
20 
main()21 int main()
22 {
23     {
24         typedef void T;
25         std::promise<T> p;
26         std::future<T> f = p.get_future();
27         p.set_value();
28         f.get();
29         try
30         {
31             p.set_value();
32             assert(false);
33         }
34         catch (const std::future_error& e)
35         {
36             assert(e.code() == make_error_code(std::future_errc::promise_already_satisfied));
37         }
38     }
39 }
40