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//===----------------------------------------------------------------------===//
//
// 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++98, 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() {
test();
}
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