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 // struct once_flag;
13 
14 // once_flag& operator=(const once_flag&) = delete;
15 
16 #include <mutex>
17 
18 int main()
19 {
20     std::once_flag f;
21     std::once_flag f2;
22     f2 = f;
23 }
24