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 // const_mem_fun_t
13 
14 #include <functional>
15 #include <type_traits>
16 #include <cassert>
17 
18 struct A
19 {
20     char a1() {return 5;}
21     short a2(int i) {return short(i+1);}
22     int a3() const {return 1;}
23     double a4(unsigned i) const {return i-1;}
24 };
25 
26 int main()
27 {
28     typedef std::const_mem_fun_t<int, A> F;
29     static_assert((std::is_base_of<std::unary_function<const A*, int>, F>::value), "");
30     const F f(&A::a3);
31     const A a = A();
32     assert(f(&a) == 1);
33 }
34