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// 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
25class A
26{
27 long data_;
28
29public:
30 explicit A(long i) : data_(i) {}
31
32 long operator()(long i, long j) const {return data_ + i + j;}
33};
34
35int 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, 97);
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

source code of libcxx/test/std/thread/futures/futures.task/futures.task.nonmembers/swap.pass.cpp