xref: /llvm-project/libcxx/test/std/thread/futures/futures.shared_future/ctor_future.pass.cpp (revision a7f9895cc18995549c7facb96e72718da282a864)
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 shared_future<R>
15 
16 // shared_future(future<R>&& rhs);
17 
18 #include <future>
19 #include <cassert>
20 
21 #include "test_macros.h"
22 
main(int,char **)23 int main(int, char**)
24 {
25     {
26         typedef int T;
27         std::promise<T> p;
28         std::future<T> f0 = p.get_future();
29         std::shared_future<T> f = std::move(f0);
30         assert(!f0.valid());
31         assert(f.valid());
32     }
33     {
34         typedef int T;
35         std::future<T> f0;
36         std::shared_future<T> f = std::move(f0);
37         assert(!f0.valid());
38         assert(!f.valid());
39     }
40     {
41         typedef int& T;
42         std::promise<T> p;
43         std::future<T> f0 = p.get_future();
44         std::shared_future<T> f = std::move(f0);
45         assert(!f0.valid());
46         assert(f.valid());
47     }
48     {
49         typedef int& T;
50         std::future<T> f0;
51         std::shared_future<T> f = std::move(f0);
52         assert(!f0.valid());
53         assert(!f.valid());
54     }
55     {
56         typedef void T;
57         std::promise<T> p;
58         std::future<T> f0 = p.get_future();
59         std::shared_future<T> f = std::move(f0);
60         assert(!f0.valid());
61         assert(f.valid());
62     }
63     {
64         typedef void T;
65         std::future<T> f0;
66         std::shared_future<T> f = std::move(f0);
67         assert(!f0.valid());
68         assert(!f.valid());
69     }
70 
71   return 0;
72 }
73