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 packaged_task<R(ArgTypes...)>
13 
14 // void swap(packaged_task& other);
15 
16 #include <future>
17 #include <cassert>
18 
19 class A
20 {
21     long data_;
22 
23 public:
A(long i)24     explicit A(long i) : data_(i) {}
25 
operator ()(long i,long j) const26     long operator()(long i, long j) const {return data_ + i + j;}
27 };
28 
main()29 int main()
30 {
31     {
32         std::packaged_task<double(int, char)> p0(A(5));
33         std::packaged_task<double(int, char)> p;
34         p.swap(p0);
35         assert(!p0.valid());
36         assert(p.valid());
37         std::future<double> f = p.get_future();
38         p(3, 'a');
39         assert(f.get() == 105.0);
40     }
41     {
42         std::packaged_task<double(int, char)> p0;
43         std::packaged_task<double(int, char)> p;
44         p.swap(p0);
45         assert(!p0.valid());
46         assert(!p.valid());
47     }
48 }
49