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