xref: /llvm-project/libcxx/test/std/utilities/function.objects/refwrap/refwrap.helpers/cref.incomplete.pass.cpp (revision 504bc07d1afc7bad7b980a977141696ec8298e7e)

//===----------------------------------------------------------------------===//
//
// 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 <ObjectType T> reference_wrapper<const T> cref(const T& t);
//
//  where T is an incomplete type (since C++20)

#include <functional>
#include <cassert>

#include "test_macros.h"


struct Foo;

Foo& get_foo();

void test() {
    Foo const& foo = get_foo();
    std::reference_wrapper<Foo const> ref = std::cref(foo);
    assert(&ref.get() == &foo);
}

struct Foo { };

Foo& get_foo() {
    static Foo foo;
    return foo;
}

int main(int, char**) {
    test();
    return 0;
}