| 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<T> |
| 14 | // |
| 15 | // where T is an incomplete type (since C++20) |
| 16 | |
| 17 | |
| 18 | #include <functional> |
| 19 | #include <cassert> |
| 20 | |
| 21 | #include "test_macros.h" |
| 22 | |
| 23 | |
| 24 | struct Foo; |
| 25 | |
| 26 | Foo& get_foo(); |
| 27 | |
| 28 | void test() { |
| 29 | Foo& foo = get_foo(); |
| 30 | std::reference_wrapper<Foo> ref{foo}; |
| 31 | assert(&ref.get() == &foo); |
| 32 | } |
| 33 | |
| 34 | struct Foo { }; |
| 35 | |
| 36 | Foo& get_foo() { |
| 37 | static Foo foo; |
| 38 | return foo; |
| 39 | } |
| 40 | |
| 41 | int main(int, char**) { |
| 42 | test(); |
| 43 | return 0; |
| 44 | } |
| 45 | |