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// UNSUPPORTED: c++98, c++03
12
13// <future>
14
15// class promise<R>
16
17// promise();
18
19#include <future>
20#include <cassert>
21
22int main()
23{
24    {
25        std::promise<int> p;
26        std::future<int> f = p.get_future();
27        assert(f.valid());
28    }
29    {
30        std::promise<int&> p;
31        std::future<int&> f = p.get_future();
32        assert(f.valid());
33    }
34    {
35        std::promise<void> p;
36        std::future<void> f = p.get_future();
37        assert(f.valid());
38    }
39}
40