1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
// { dg-do run { target c++11 } }
// { dg-require-effective-target hosted }
// Copyright (C) 2008-2024 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;
}
|
