| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| |
| // <functional> |
| // |
| // reference_wrapper |
| // |
| // template <class... ArgTypes> |
| // std::invoke_result_t<T&, ArgTypes...> |
| // operator()(ArgTypes&&... args) const; |
| // |
| // Requires T to be a complete type (since C++20). |
| |
| #include <functional> |
| |
| |
| struct Foo; |
| Foo& get_foo(); |
| |
| void test() { |
| std::reference_wrapper<Foo> ref = get_foo(); |
| ref(0); // incomplete at the point of call |
| } |
| |
| struct Foo { void operator()(int) const { } }; |
| Foo& get_foo() { static Foo foo; return foo; } |
| |
| int main(int, char**) { |
| test(); |
| return 0; |
| } |
