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 // future<R> get_future();
18 
19 #include <future>
20 #include <cassert>
21 
22 #include "test_macros.h"
23 
24 class A
25 {
26     long data_;
27 
28 public:
A(long i)29     explicit A(long i) : data_(i) {}
30 
operator ()(long i,long j) const31     long operator()(long i, long j) const {return data_ + i + j;}
32 };
33 
main()34 int main()
35 {
36     {
37         std::packaged_task<double(int, char)> p(A(5));
38         std::future<double> f = p.get_future();
39         p(3, 'a');
40         assert(f.get() == 105.0);
41     }
42 #ifndef TEST_HAS_NO_EXCEPTIONS
43     {
44         std::packaged_task<double(int, char)> p(A(5));
45         std::future<double> f = p.get_future();
46         try
47         {
48             f = p.get_future();
49             assert(false);
50         }
51         catch (const std::future_error& e)
52         {
53             assert(e.code() ==  make_error_code(std::future_errc::future_already_retrieved));
54         }
55     }
56     {
57         std::packaged_task<double(int, char)> p;
58         try
59         {
60             std::future<double> f = p.get_future();
61             assert(false);
62         }
63         catch (const std::future_error& e)
64         {
65             assert(e.code() ==  make_error_code(std::future_errc::no_state));
66         }
67     }
68 #endif
69 }
70