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, c++11, c++14, c++17 |
10 | |
11 | // <functional> |
12 | // |
13 | // reference_wrapper |
14 | // |
15 | // template <class... ArgTypes> |
16 | // std::invoke_result_t<T&, ArgTypes...> |
17 | // operator()(ArgTypes&&... args) const; |
18 | // |
19 | // Requires T to be a complete type (since C++20). |
20 | |
21 | #include <functional> |
22 | |
23 | |
24 | struct Foo; |
25 | Foo& get_foo(); |
26 | |
27 | void test() { |
28 | std::reference_wrapper<Foo> ref = get_foo(); |
29 | ref(0); // incomplete at the point of call |
30 | } |
31 | |
32 | struct Foo { void operator()(int) const { } }; |
33 | Foo& get_foo() { static Foo foo; return foo; } |
34 | |
35 | int main(int, char**) { |
36 | test(); |
37 | return 0; |
38 | } |
39 | |