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 // future<R> get_future();
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 {return data_ + i + j;}
31 };
32 
main(int,char **)33 int main(int, char**)
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 #ifndef TEST_HAS_NO_EXCEPTIONS
42     {
43         std::packaged_task<double(int, char)> p(A(5));
44         std::future<double> f = p.get_future();
45         try
46         {
47             f = p.get_future();
48             assert(false);
49         }
50         catch (const std::future_error& e)
51         {
52             assert(e.code() ==  make_error_code(std::future_errc::future_already_retrieved));
53         }
54     }
55     {
56         std::packaged_task<double(int, char)> p;
57         try
58         {
59             std::future<double> f = p.get_future();
60             assert(false);
61         }
62         catch (const std::future_error& e)
63         {
64             assert(e.code() ==  make_error_code(std::future_errc::no_state));
65         }
66     }
67 #endif
68 
69   return 0;
70 }
71