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 // void reset();
17 
18 #include <future>
19 #include <cassert>
20 
21 #include "test_macros.h"
22 
23 class A
24 {
25     long data_;
26 
27 public:
A(long i)28     explicit A(long i) : data_(i) {}
29 
operator ()(long i,long j) const30     long operator()(long i, long j) const
31     {
32         return data_ + i + j;
33     }
34 };
35 
main(int,char **)36 int main(int, char**)
37 {
38     {
39         std::packaged_task<double(int, char)> p(A(5));
40         std::future<double> f = p.get_future();
41         p(3, 'a');
42         assert(f.get() == 105.0);
43         p.reset();
44         p(4, 'a');
45         f = p.get_future();
46         assert(f.get() == 106.0);
47     }
48 #ifndef TEST_HAS_NO_EXCEPTIONS
49     {
50         std::packaged_task<double(int, char)> p;
51         try
52         {
53             p.reset();
54             assert(false);
55         }
56         catch (const std::future_error& e)
57         {
58             assert(e.code() == make_error_code(std::future_errc::no_state));
59         }
60     }
61 #endif
62 
63   return 0;
64 }
65