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83ffe9cd | 1 | // Copyright (C) 2015-2023 Free Software Foundation, Inc. |
6bc41b26 JW |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
52066eae | 18 | // { dg-do run { target c++11 } } |
7cc9022f | 19 | // { dg-require-effective-target hosted } |
6bc41b26 JW |
20 | |
21 | #include <memory> | |
22 | #include <testsuite_hooks.h> | |
23 | ||
24 | template<typename T, typename U> | |
25 | bool | |
26 | share_ownership(const std::shared_ptr<T>& p1, const std::shared_ptr<U>& p2) | |
27 | { | |
28 | return !p1.owner_before(p2) && !p2.owner_before(p1); | |
29 | } | |
30 | ||
31 | void | |
32 | test01() | |
33 | { | |
34 | struct X : public std::enable_shared_from_this<X> { }; | |
35 | using CX = const X; | |
b1bd9158 | 36 | std::shared_ptr<CX> p(new CX); |
6bc41b26 | 37 | VERIFY( share_ownership(p->shared_from_this(), p) ); |
b1bd9158 | 38 | p.reset(new X); |
6bc41b26 JW |
39 | VERIFY( share_ownership(p->shared_from_this(), p) ); |
40 | auto p2 = std::const_pointer_cast<X>(p)->shared_from_this(); | |
41 | VERIFY( share_ownership(p2, p) ); | |
42 | } | |
43 | ||
44 | void | |
45 | test02() | |
46 | { | |
47 | struct X; | |
48 | using CX = const X; | |
49 | struct X : public std::enable_shared_from_this<CX> { }; | |
50 | std::shared_ptr<CX> p(new X); | |
51 | VERIFY( share_ownership(p->shared_from_this(), p) ); | |
52 | p.reset(new CX); | |
53 | VERIFY( share_ownership(p->shared_from_this(), p) ); | |
54 | } | |
55 | ||
56 | int | |
57 | main() | |
58 | { | |
59 | test01(); | |
60 | test02(); | |
61 | } |