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 // template<Returnable R, class T> unspecified mem_fn(R T::* pm);
13 
14 #include <functional>
15 #include <cassert>
16 
17 struct A
18 {
19     double data_;
20 };
21 
22 template <class F>
23 void
24 test(F f)
25 {
26     {
27     A a;
28     f(a) = 5;
29     assert(a.data_ == 5);
30     A* ap = &a;
31     f(ap) = 6;
32     assert(a.data_ == 6);
33     const A* cap = ap;
34     assert(f(cap) == f(ap));
35     f(cap) = 7;
36     }
37 }
38 
39 int main()
40 {
41     test(std::mem_fn(&A::data_));
42 }
43