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
21int 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