1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // GCC 5 does not evaluate static assertions dependent on a template parameter.
10 // UNSUPPORTED: gcc-5
11 
12 // <functional>
13 
14 // template<Returnable R, class T> unspecified mem_fn(R T::* pm);
15 
16 #include <functional>
17 #include <cassert>
18 
19 struct A
20 {
21     double data_;
22 };
23 
24 template <class F>
25 void
26 test(F f)
27 {
28     {
29     A a;
30     f(a) = 5;
31     assert(a.data_ == 5);
32     A* ap = &a;
33     f(ap) = 6;
34     assert(a.data_ == 6);
35     const A* cap = ap;
36     assert(f(cap) == f(ap));
37     f(cap) = 7;
38     }
39 }
40 
41 int main(int, char**)
42 {
43     test(std::mem_fn(&A::data_));
44 
45   return 0;
46 }
47