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 // <functional>
10 
11 // template<Returnable R, class T, CopyConstructible... Args>
12 //   unspecified mem_fn(R (T::* pm)(Args...) volatile);
13 
14 #include <functional>
15 #include <cassert>
16 
17 #include "test_macros.h"
18 
19 struct A
20 {
21     char test0() volatile {return 'a';}
22     char test1(int) volatile {return 'b';}
23     char test2(int, double) volatile {return 'c';}
24 };
25 
26 template <class F>
27 void
28 test0(F f)
29 {
30     {
31     A a;
32     assert(f(a) == 'a');
33     A* ap = &a;
34     assert(f(ap) == 'a');
35     volatile A* cap = &a;
36     assert(f(cap) == 'a');
37     const F& cf = f;
38     assert(cf(ap) == 'a');
39     }
40 }
41 
42 template <class F>
43 void
44 test1(F f)
45 {
46     {
47     A a;
48     assert(f(a, 1) == 'b');
49     A* ap = &a;
50     assert(f(ap, 2) == 'b');
51     volatile A* cap = &a;
52     assert(f(cap, 2) == 'b');
53     const F& cf = f;
54     assert(cf(ap, 2) == 'b');
55     }
56 }
57 
58 template <class F>
59 void
60 test2(F f)
61 {
62     {
63     A a;
64     assert(f(a, 1, 2) == 'c');
65     A* ap = &a;
66     assert(f(ap, 2, 3.5) == 'c');
67     volatile A* cap = &a;
68     assert(f(cap, 2, 3.5) == 'c');
69     const F& cf = f;
70     assert(cf(ap, 2, 3.5) == 'c');
71     }
72 }
73 
74 int main(int, char**)
75 {
76     test0(std::mem_fn(&A::test0));
77     test1(std::mem_fn(&A::test1));
78     test2(std::mem_fn(&A::test2));
79 
80   return 0;
81 }
82