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 // promise();
17 
18 #include <future>
19 #include <cassert>
20 
main()21 int main()
22 {
23     {
24         std::promise<int> p;
25         std::future<int> f = p.get_future();
26         assert(f.valid());
27     }
28     {
29         std::promise<int&> p;
30         std::future<int&> f = p.get_future();
31         assert(f.valid());
32     }
33     {
34         std::promise<void> p;
35         std::future<void> f = p.get_future();
36         assert(f.valid());
37     }
38 }
39