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 // <future>
11 
12 // class future<R>
13 
14 // future();
15 
16 #include <future>
17 #include <cassert>
18 
main()19 int main()
20 {
21     {
22         std::future<int> f;
23         assert(!f.valid());
24     }
25     {
26         std::future<int&> f;
27         assert(!f.valid());
28     }
29     {
30         std::future<void> f;
31         assert(!f.valid());
32     }
33 }
34