invoke_void_0.pass.cpp revision b64f8b07c104c6cc986570ac8ee0ed16a9f23976 
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// template <class... ArgTypes>
15//   requires Callable<T, ArgTypes&&...>
16//   Callable<T, ArgTypes&&...>::result_type
17//   operator()(ArgTypes&&... args) const;
18
19#include <functional>
20#include <cassert>
21
22// 0 args, return void
23
24int count = 0;
25
26void f_void_0()
27{
28    ++count;
29}
30
31struct A_void_0
32{
33    void operator()() {++count;}
34};
35
36void
37test_void_0()
38{
39    int save_count = count;
40    // function
41    {
42    std::reference_wrapper<void ()> r1(f_void_0);
43    r1();
44    assert(count == save_count+1);
45    save_count = count;
46    }
47    // function pointer
48    {
49    void (*fp)() = f_void_0;
50    std::reference_wrapper<void (*)()> r1(fp);
51    r1();
52    assert(count == save_count+1);
53    save_count = count;
54    }
55    // functor
56    {
57    A_void_0 a0;
58    std::reference_wrapper<A_void_0> r1(a0);
59    r1();
60    assert(count == save_count+1);
61    save_count = count;
62    }
63}
64
65int main()
66{
67    test_void_0();
68}
69