1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // UNSUPPORTED: libcpp-has-no-threads
10 
11 // <future>
12 
13 // class shared_future<R>
14 
15 // shared_future();
16 
17 #include <future>
18 #include <cassert>
19 
20 int main(int, char**)
21 {
22     {
23         std::shared_future<int> f;
24         assert(!f.valid());
25     }
26     {
27         std::shared_future<int&> f;
28         assert(!f.valid());
29     }
30     {
31         std::shared_future<void> f;
32         assert(!f.valid());
33     }
34 
35   return 0;
36 }
37