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 packaged_task<R(ArgTypes...)>
16
17// packaged_task();
18
19#include <future>
20#include <cassert>
21
22struct A {};
23
24int main()
25{
26    std::packaged_task<A(int, char)> p;
27    assert(!p.valid());
28}
29