1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // UNSUPPORTED: libcpp-has-no-threads
10 // UNSUPPORTED: c++03
11 
12 // <future>
13 
14 // class packaged_task<R(ArgTypes...)>
15 
16 // ~packaged_task();
17 
18 #include <future>
19 #include <cassert>
20 
21 #include "test_macros.h"
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 void func(std::packaged_task<double(int, char)>)
34 {
35 }
36 
37 void func2(std::packaged_task<double(int, char)> p)
38 {
39     p(3, 'a');
40 }
41 
42 int main(int, char**)
43 {
44 #ifndef TEST_HAS_NO_EXCEPTIONS
45     {
46         std::packaged_task<double(int, char)> p(A(5));
47         std::future<double> f = p.get_future();
48         std::thread(func, std::move(p)).detach();
49         try
50         {
51             double i = f.get();
52             ((void)i); // Prevent unused warning
53             assert(false);
54         }
55         catch (const std::future_error& e)
56         {
57             assert(e.code() == make_error_code(std::future_errc::broken_promise));
58         }
59     }
60 #endif
61     {
62         std::packaged_task<double(int, char)> p(A(5));
63         std::future<double> f = p.get_future();
64         std::thread(func2, std::move(p)).detach();
65         assert(f.get() == 105.0);
66     }
67 
68   return 0;
69 }
70