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
19int 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