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1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // UNSUPPORTED: libcpp-has-no-threads
11 
12 // <future>
13 
14 // class promise<R>
15 
16 // void swap(promise& other);
17 
18 // template <class R> void swap(promise<R>& x, promise<R>& y);
19 
20 #include <future>
21 #include <cassert>
22 
23 #include "../test_allocator.h"
24 
main()25 int main()
26 {
27     assert(test_alloc_base::count == 0);
28     {
29         std::promise<int> p0(std::allocator_arg, test_allocator<int>());
30         std::promise<int> p(std::allocator_arg, test_allocator<int>());
31         assert(test_alloc_base::count == 2);
32         p.swap(p0);
33         assert(test_alloc_base::count == 2);
34         std::future<int> f = p.get_future();
35         assert(test_alloc_base::count == 2);
36         assert(f.valid());
37         f = p0.get_future();
38         assert(f.valid());
39         assert(test_alloc_base::count == 2);
40     }
41     assert(test_alloc_base::count == 0);
42     {
43         std::promise<int> p0(std::allocator_arg, test_allocator<int>());
44         std::promise<int> p(std::allocator_arg, test_allocator<int>());
45         assert(test_alloc_base::count == 2);
46         swap(p, p0);
47         assert(test_alloc_base::count == 2);
48         std::future<int> f = p.get_future();
49         assert(test_alloc_base::count == 2);
50         assert(f.valid());
51         f = p0.get_future();
52         assert(f.valid());
53         assert(test_alloc_base::count == 2);
54     }
55     assert(test_alloc_base::count == 0);
56     {
57         std::promise<int> p0(std::allocator_arg, test_allocator<int>());
58         std::promise<int> p;
59         assert(test_alloc_base::count == 1);
60         p.swap(p0);
61         assert(test_alloc_base::count == 1);
62         std::future<int> f = p.get_future();
63         assert(test_alloc_base::count == 1);
64         assert(f.valid());
65         f = p0.get_future();
66         assert(f.valid());
67         assert(test_alloc_base::count == 1);
68     }
69     assert(test_alloc_base::count == 0);
70     {
71         std::promise<int> p0(std::allocator_arg, test_allocator<int>());
72         std::promise<int> p;
73         assert(test_alloc_base::count == 1);
74         swap(p, p0);
75         assert(test_alloc_base::count == 1);
76         std::future<int> f = p.get_future();
77         assert(test_alloc_base::count == 1);
78         assert(f.valid());
79         f = p0.get_future();
80         assert(f.valid());
81         assert(test_alloc_base::count == 1);
82     }
83     assert(test_alloc_base::count == 0);
84 }
85