| // { dg-do run { target c++11 } } |
| |
| // Copyright (C) 2008-2021 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/>. |
| |
| // 20.8.13.3 Template class weak_ptr [util.smartptr.weak] |
| |
| #include <memory> |
| #include <testsuite_hooks.h> |
| |
| struct A { }; |
| struct B { }; |
| |
| // 20.6.6.3.5 weak_ptr observers [util.smartptr.weak.obs] |
| |
| void |
| test01() |
| { |
| // test empty weak_ptrs compare equivalent |
| std::weak_ptr<A> p1; |
| std::weak_ptr<B> p2; |
| VERIFY( !p1.owner_before(p2) && !p2.owner_before(p1) ); |
| |
| std::shared_ptr<B> p3; |
| VERIFY( !p1.owner_before(p3) && !p3.owner_before(p1) ); |
| |
| static_assert( noexcept(p1.owner_before(p1)), "" ); |
| static_assert( noexcept(p1.owner_before(p2)), "" ); |
| static_assert( noexcept(p1.owner_before(p3)), "" ); |
| static_assert( noexcept(p2.owner_before(p1)), "" ); |
| } |
| |
| |
| void |
| test02() |
| { |
| std::shared_ptr<A> a0; |
| std::weak_ptr<A> w0(a0); |
| |
| std::shared_ptr<A> a1(new A); |
| std::weak_ptr<A> w1(a1); |
| VERIFY( !a1.owner_before(w1) && !w1.owner_before(a1) ); |
| |
| VERIFY( w1.owner_before(w0) || w0.owner_before(w1) ); |
| VERIFY( !(w1.owner_before(w0) && w0.owner_before(w1)) ); |
| |
| VERIFY( w1.owner_before(a0) || a0.owner_before(w1) ); |
| VERIFY( !(w1.owner_before(a0) && a0.owner_before(w1)) ); |
| |
| std::shared_ptr<B> b1(new B); |
| VERIFY( w1.owner_before(b1) || b1.owner_before(w1) ); |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| return 0; |
| } |