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 future<R>
15 
16 // future();
17 
18 #include <future>
19 #include <cassert>
20 
main()21 int main()
22 {
23     {
24         std::future<int> f;
25         assert(!f.valid());
26     }
27     {
28         std::future<int&> f;
29         assert(!f.valid());
30     }
31     {
32         std::future<void> f;
33         assert(!f.valid());
34     }
35 }
36