| // Copyright (C) 2019-2023 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-do compile { target c++17 } } |
| |
| // PR 91456 |
| // std::function and std::is_invocable_r do not understand guaranteed elision |
| |
| #include <type_traits> |
| |
| #include <functional> |
| |
| struct Immovable { |
| Immovable() = default; |
| Immovable(const Immovable&) = delete; |
| Immovable& operator=(const Immovable&) = delete; |
| }; |
| |
| static_assert(std::is_invocable_r_v<Immovable, Immovable(*)()>); |
| static_assert(std::is_invocable_r_v<const Immovable, Immovable(*)()>); |
| static_assert(std::is_invocable_r_v<Immovable, const Immovable(*)()>); |
