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1 | // Copyright (C) 2015 Free Software Foundation, Inc. |
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 | ||
18 | // { dg-options "-std=gnu++11" } | |
19 | ||
20 | #include <memory> | |
21 | #include <testsuite_hooks.h> | |
22 | ||
23 | template<typename T, typename U> | |
24 | bool | |
25 | share_ownership(const std::shared_ptr<T>& p1, const std::shared_ptr<U>& p2) | |
26 | { | |
27 | return !p1.owner_before(p2) && !p2.owner_before(p1); | |
28 | } | |
29 | ||
30 | void | |
31 | test01() | |
32 | { | |
33 | struct X : public std::enable_shared_from_this<X> { }; | |
34 | using CX = const X; | |
35 | std::shared_ptr<CX> p(new X); | |
36 | VERIFY( share_ownership(p->shared_from_this(), p) ); | |
37 | p.reset(new CX); | |
38 | VERIFY( share_ownership(p->shared_from_this(), p) ); | |
39 | auto p2 = std::const_pointer_cast<X>(p)->shared_from_this(); | |
40 | VERIFY( share_ownership(p2, p) ); | |
41 | } | |
42 | ||
43 | void | |
44 | test02() | |
45 | { | |
46 | struct X; | |
47 | using CX = const X; | |
48 | struct X : public std::enable_shared_from_this<CX> { }; | |
49 | std::shared_ptr<CX> p(new X); | |
50 | VERIFY( share_ownership(p->shared_from_this(), p) ); | |
51 | p.reset(new CX); | |
52 | VERIFY( share_ownership(p->shared_from_this(), p) ); | |
53 | } | |
54 | ||
55 | int | |
56 | main() | |
57 | { | |
58 | test01(); | |
59 | test02(); | |
60 | } |