| // Copyright (C) 2019-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-options "-std=gnu++2a" } |
| // { dg-do compile { target c++2a } } |
| |
| // P0357R3 reference_wrapper for incomplete types |
| |
| #include <functional> |
| |
| struct Incomplete; |
| |
| template class std::reference_wrapper<Incomplete>; |
| |
| Incomplete& f(); |
| |
| std::reference_wrapper<Incomplete> r = f(); |
| static_assert( std::is_same_v<decltype(r)::type, Incomplete> ); |
| static_assert( std::is_same_v<decltype(r.get()), Incomplete&> ); |
| |
| std::reference_wrapper r2 = f(); |
| static_assert( std::is_same_v<decltype(r), decltype(r2)> ); |
