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 // UNSUPPORTED: c++98, c++03
12
13 // <future>
14
15 // class promise<R>
16
17 // void swap(promise& other);
18
19 // template <class R> void swap(promise<R>& x, promise<R>& y);
20
21 #include <future>
22 #include <cassert>
23
24 #include "test_allocator.h"
25
main()26 int main()
27 {
28 assert(test_alloc_base::alloc_count == 0);
29 {
30 std::promise<int> p0(std::allocator_arg, test_allocator<int>());
31 std::promise<int> p(std::allocator_arg, test_allocator<int>());
32 assert(test_alloc_base::alloc_count == 2);
33 p.swap(p0);
34 assert(test_alloc_base::alloc_count == 2);
35 std::future<int> f = p.get_future();
36 assert(test_alloc_base::alloc_count == 2);
37 assert(f.valid());
38 f = p0.get_future();
39 assert(f.valid());
40 assert(test_alloc_base::alloc_count == 2);
41 }
42 assert(test_alloc_base::alloc_count == 0);
43 {
44 std::promise<int> p0(std::allocator_arg, test_allocator<int>());
45 std::promise<int> p(std::allocator_arg, test_allocator<int>());
46 assert(test_alloc_base::alloc_count == 2);
47 swap(p, p0);
48 assert(test_alloc_base::alloc_count == 2);
49 std::future<int> f = p.get_future();
50 assert(test_alloc_base::alloc_count == 2);
51 assert(f.valid());
52 f = p0.get_future();
53 assert(f.valid());
54 assert(test_alloc_base::alloc_count == 2);
55 }
56 assert(test_alloc_base::alloc_count == 0);
57 {
58 std::promise<int> p0(std::allocator_arg, test_allocator<int>());
59 std::promise<int> p;
60 assert(test_alloc_base::alloc_count == 1);
61 p.swap(p0);
62 assert(test_alloc_base::alloc_count == 1);
63 std::future<int> f = p.get_future();
64 assert(test_alloc_base::alloc_count == 1);
65 assert(f.valid());
66 f = p0.get_future();
67 assert(f.valid());
68 assert(test_alloc_base::alloc_count == 1);
69 }
70 assert(test_alloc_base::alloc_count == 0);
71 {
72 std::promise<int> p0(std::allocator_arg, test_allocator<int>());
73 std::promise<int> p;
74 assert(test_alloc_base::alloc_count == 1);
75 swap(p, p0);
76 assert(test_alloc_base::alloc_count == 1);
77 std::future<int> f = p.get_future();
78 assert(test_alloc_base::alloc_count == 1);
79 assert(f.valid());
80 f = p0.get_future();
81 assert(f.valid());
82 assert(test_alloc_base::alloc_count == 1);
83 }
84 assert(test_alloc_base::alloc_count == 0);
85 }
86