| // 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> |
| bool not_enabled(T& t) |
| { |
| #if __cpp_lib_enable_shared_from_this >= 201603 |
| return t.weak_from_this().expired(); |
| #else |
| try { |
| t.shared_from_this(); |
| return false; |
| } catch (const std::bad_weak_ptr&) { |
| return true; |
| } |
| #endif |
| } |
| |
| struct A : std::enable_shared_from_this<A> { }; |
| struct B : std::enable_shared_from_this<B> { }; |
| struct D : A, B { }; |
| |
| void test01() |
| { |
| auto d = std::make_shared<D>(); |
| VERIFY( not_enabled( static_cast<A&>(*d) ) ); |
| VERIFY( not_enabled( static_cast<const A&>(*d) ) ); |
| VERIFY( not_enabled( static_cast<B&>(*d) ) ); |
| VERIFY( not_enabled( static_cast<const B&>(*d) ) ); |
| } |
| |
| struct E : std::__enable_shared_from_this<E> { }; |
| struct F : std::__enable_shared_from_this<F> { }; |
| struct G : E, F { }; |
| |
| void test02() |
| { |
| auto g = std::make_shared<G>(); |
| VERIFY( not_enabled( static_cast<E&>(*g) ) ); |
| VERIFY( not_enabled( static_cast<const E&>(*g) ) ); |
| VERIFY( not_enabled( static_cast<F&>(*g) ) ); |
| VERIFY( not_enabled( static_cast<const F&>(*g) ) ); |
| } |
| |
| struct H : D, G { }; |
| |
| void test03() |
| { |
| auto h = std::make_shared<H>(); |
| VERIFY( not_enabled( static_cast<A&>(*h) ) ); |
| VERIFY( not_enabled( static_cast<const A&>(*h) ) ); |
| VERIFY( not_enabled( static_cast<B&>(*h) ) ); |
| VERIFY( not_enabled( static_cast<const B&>(*h) ) ); |
| VERIFY( not_enabled( static_cast<E&>(*h) ) ); |
| VERIFY( not_enabled( static_cast<const E&>(*h) ) ); |
| VERIFY( not_enabled( static_cast<F&>(*h) ) ); |
| VERIFY( not_enabled( static_cast<const F&>(*h) ) ); |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| test03(); |
| } |