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: 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
23class A
24{
25 long data_;
26
27public:
28 explicit A(long i) : data_(i) {}
29
30 long operator()(long i, long j) const
31 {
32 return data_ + i + j;
33 }
34};
35
36int 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, 97);
42 assert(f.get() == 105.0);
43 p.reset();
44 p(4, 97);
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

source code of libcxx/test/std/thread/futures/futures.task/futures.task.members/reset.pass.cpp