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 // XFAIL: libcpp-no-exceptions
11 // UNSUPPORTED: libcpp-has-no-threads
12 // UNSUPPORTED: c++98, c++03
13 
14 // <future>
15 
16 // class packaged_task<R(ArgTypes...)>
17 
18 // future<R> get_future();
19 
20 #include <future>
21 #include <cassert>
22 
23 class A
24 {
25     long data_;
26 
27 public:
28     explicit A(long i) : data_(i) {}
29 
30     long operator()(long i, long j) const {return data_ + i + j;}
31 };
32 
33 int main()
34 {
35     {
36         std::packaged_task<double(int, char)> p(A(5));
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)> p(A(5));
43         std::future<double> f = p.get_future();
44         try
45         {
46             f = p.get_future();
47             assert(false);
48         }
49         catch (const std::future_error& e)
50         {
51             assert(e.code() ==  make_error_code(std::future_errc::future_already_retrieved));
52         }
53     }
54     {
55         std::packaged_task<double(int, char)> p;
56         try
57         {
58             std::future<double> f = p.get_future();
59             assert(false);
60         }
61         catch (const std::future_error& e)
62         {
63             assert(e.code() ==  make_error_code(std::future_errc::no_state));
64         }
65     }
66 }
67