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 // UNSUPPORTED: c++03
10 
11 // <functional>
12 
13 #include <functional>
14 
15 #include "test_macros.h"
16 
17 struct Incomplete;
18 template<class T> struct Holder { T t; };
19 typedef Holder<Incomplete> *Ptr;
20 
21 Ptr no_args() { return nullptr; }
22 Ptr one_arg(Ptr p) { return p; }
23 Ptr two_args(Ptr p, Ptr) { return p; }
24 Ptr three_args(Ptr p, Ptr, Ptr) { return p; }
25 Ptr four_args(Ptr p, Ptr, Ptr, Ptr) { return p; }
26 
27 void one_arg_void(Ptr) { }
28 
29 int main(int, char**)
30 {
31     Ptr x = nullptr;
32     std::function<Ptr()> f(no_args); f();
33     std::function<Ptr(Ptr)> g(one_arg); g(x);
34     std::function<void(Ptr)> h(one_arg_void); h(x);
35     return 0;
36 }
37