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// <thread>
13
14// class thread
15
16// void swap(thread& t);
17
18#include <thread>
19#include <new>
20#include <cstdlib>
21#include <cassert>
22
23class G
24{
25    int alive_;
26public:
27    static int n_alive;
28    static bool op_run;
29
30    G() : alive_(1) {++n_alive;}
31    G(const G& g) : alive_(g.alive_) {++n_alive;}
32    ~G() {alive_ = 0; --n_alive;}
33
34    void operator()()
35    {
36        assert(alive_ == 1);
37        assert(n_alive >= 1);
38        op_run = true;
39    }
40};
41
42int G::n_alive = 0;
43bool G::op_run = false;
44
45int main()
46{
47    {
48        G g;
49        std::thread t0(g);
50        std::thread::id id0 = t0.get_id();
51        std::thread t1;
52        std::thread::id id1 = t1.get_id();
53        t0.swap(t1);
54        assert(t0.get_id() == id1);
55        assert(t1.get_id() == id0);
56        t1.join();
57    }
58}
59