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 F>
17// explicit packaged_task(F&& f);
18
19#include <future>
20#include <cassert>
21
22#include "test_macros.h"
23
24class A
25{
26 long data_;
27
28public:
29 static int n_moves;
30 static int n_copies;
31
32 explicit A(long i) : data_(i) {}
33 A(A&& a) : data_(a.data_) {++n_moves; a.data_ = -1;}
34 A(const A& a) : data_(a.data_) {++n_copies;}
35
36 long operator()(long i, long j) const {return data_ + i + j;}
37};
38
39int A::n_moves = 0;
40int A::n_copies = 0;
41
42int func(int i) { return i; }
43
44int main(int, char**)
45{
46 {
47 std::packaged_task<double(int, char)> p(A(5));
48 assert(p.valid());
49 std::future<double> f = p.get_future();
50 p(3, 97);
51 assert(f.get() == 105.0);
52 assert(A::n_copies == 0);
53 assert(A::n_moves > 0);
54 }
55 A::n_copies = 0;
56 A::n_copies = 0;
57 {
58 A a(5);
59 std::packaged_task<double(int, char)> p(a);
60 assert(p.valid());
61 std::future<double> f = p.get_future();
62 p(3, 97);
63 assert(f.get() == 105.0);
64 assert(A::n_copies > 0);
65 assert(A::n_moves > 0);
66 }
67 {
68 std::packaged_task<int(int)> p(&func);
69 assert(p.valid());
70 std::future<int> f = p.get_future();
71 p(4);
72 assert(f.get() == 4);
73 }
74 {
75 std::packaged_task<int(int)> p(func);
76 assert(p.valid());
77 std::future<int> f = p.get_future();
78 p(4);
79 assert(f.get() == 4);
80 }
81
82 return 0;
83}
84

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