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 // <mutex>
11 
12 // template <class Mutex> class lock_guard;
13 
14 // lock_guard(lock_guard const&) = delete;
15 
16 #include <mutex>
17 
18 int main()
19 {
20     std::mutex m;
21     std::lock_guard<std::mutex> lg0(m);
22     std::lock_guard<std::mutex> lg(lg0);
23 }
24