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 
12 // <future>
13 
14 // class packaged_task<R(ArgTypes...)>
15 
16 // future<R> get_future();
17 
18 #include <future>
19 #include <cassert>
20 
21 class A
22 {
23     long data_;
24 
25 public:
A(long i)26     explicit A(long i) : data_(i) {}
27 
operator ()(long i,long j) const28     long operator()(long i, long j) const {return data_ + i + j;}
29 };
30 
main()31 int main()
32 {
33     {
34         std::packaged_task<double(int, char)> p(A(5));
35         std::future<double> f = p.get_future();
36         p(3, 'a');
37         assert(f.get() == 105.0);
38     }
39     {
40         std::packaged_task<double(int, char)> p(A(5));
41         std::future<double> f = p.get_future();
42         try
43         {
44             f = p.get_future();
45             assert(false);
46         }
47         catch (const std::future_error& e)
48         {
49             assert(e.code() ==  make_error_code(std::future_errc::future_already_retrieved));
50         }
51     }
52     {
53         std::packaged_task<double(int, char)> p;
54         try
55         {
56             std::future<double> f = p.get_future();
57             assert(false);
58         }
59         catch (const std::future_error& e)
60         {
61             assert(e.code() ==  make_error_code(std::future_errc::no_state));
62         }
63     }
64 }
65