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 swap(packaged_task& other);
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)> p0(A(5));
37 std::packaged_task<double(int, char)> p;
38 p.swap(p0);
39 assert(!p0.valid());
40 assert(p.valid());
41 std::future<double> f = p.get_future();
42 p(3, 'a');
43 assert(f.get() == 105.0);
44 }
45 {
46 std::packaged_task<double(int, char)> p0;
47 std::packaged_task<double(int, char)> p;
48 p.swap(p0);
49 assert(!p0.valid());
50 assert(!p.valid());
51 }
52
53 return 0;
54 }
55