| // Copyright (C) 2015-2021 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-do run { target c++11 } } |
| |
| #include <memory> |
| #include <testsuite_hooks.h> |
| |
| template<typename T, typename U> |
| bool |
| share_ownership(const std::shared_ptr<T>& p1, const std::shared_ptr<U>& p2) |
| { |
| return !p1.owner_before(p2) && !p2.owner_before(p1); |
| } |
| |
| void |
| test01() |
| { |
| struct X : public std::enable_shared_from_this<X> { }; |
| using CX = const X; |
| std::shared_ptr<CX> p(new CX); |
| VERIFY( share_ownership(p->shared_from_this(), p) ); |
| p.reset(new X); |
| VERIFY( share_ownership(p->shared_from_this(), p) ); |
| auto p2 = std::const_pointer_cast<X>(p)->shared_from_this(); |
| VERIFY( share_ownership(p2, p) ); |
| } |
| |
| void |
| test02() |
| { |
| struct X; |
| using CX = const X; |
| struct X : public std::enable_shared_from_this<CX> { }; |
| std::shared_ptr<CX> p(new X); |
| VERIFY( share_ownership(p->shared_from_this(), p) ); |
| p.reset(new CX); |
| VERIFY( share_ownership(p->shared_from_this(), p) ); |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| } |