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// <thread>
11
12// class thread
13
14// void swap(thread& x, thread& y);
15
16#include <thread>
17#include <new>
18#include <cstdlib>
19#include <cassert>
20
21class G
22{
23    int alive_;
24public:
25    static int n_alive;
26    static bool op_run;
27
28    G() : alive_(1) {++n_alive;}
29    G(const G& g) : alive_(g.alive_) {++n_alive;}
30    ~G() {alive_ = 0; --n_alive;}
31
32    void operator()()
33    {
34        assert(alive_ == 1);
35        assert(n_alive >= 1);
36        op_run = true;
37    }
38};
39
40int G::n_alive = 0;
41bool G::op_run = false;
42
43int main()
44{
45    {
46        std::thread t0((G()));
47        std::thread::id id0 = t0.get_id();
48        std::thread t1;
49        std::thread::id id1 = t1.get_id();
50        swap(t0, t1);
51        assert(t0.get_id() == id1);
52        assert(t1.get_id() == id0);
53        t1.join();
54    }
55}
56