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 // template <class R, class... ArgTypes>
17 // void
18 // swap(packaged_task<R(ArgTypes...)>& x, packaged_task<R(ArgTypes...)>& y);
19
20 #include <future>
21 #include <cassert>
22
23 #include "test_macros.h"
24
25 class A
26 {
27 long data_;
28
29 public:
A(long i)30 explicit A(long i) : data_(i) {}
31
operator ()(long i,long j) const32 long operator()(long i, long j) const {return data_ + i + j;}
33 };
34
main(int,char **)35 int main(int, char**)
36 {
37 {
38 std::packaged_task<double(int, char)> p0(A(5));
39 std::packaged_task<double(int, char)> p;
40 swap(p, p0);
41 assert(!p0.valid());
42 assert(p.valid());
43 std::future<double> f = p.get_future();
44 p(3, 'a');
45 assert(f.get() == 105.0);
46 }
47 {
48 std::packaged_task<double(int, char)> p0;
49 std::packaged_task<double(int, char)> p;
50 swap(p, p0);
51 assert(!p0.valid());
52 assert(!p.valid());
53 }
54
55 return 0;
56 }
57