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 // <functional>
11 
12 // reference_wrapper
13 
14 // operator T& () const;
15 
16 #include <functional>
17 #include <cassert>
18 
19 class functor1
20     : public std::unary_function<int, char>
21 {
22 };
23 
24 template <class T>
25 void
test(T & t)26 test(T& t)
27 {
28     std::reference_wrapper<T> r(t);
29     T& r2 = r;
30     assert(&r2 == &t);
31 }
32 
f()33 void f() {}
34 
main()35 int main()
36 {
37     void (*fp)() = f;
38     test(fp);
39     test(f);
40     functor1 f1;
41     test(f1);
42     int i = 0;
43     test(i);
44     const int j = 0;
45     test(j);
46 }
47