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
76
77
78
79
80
81
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <memory>
// weak_ptr
// weak_ptr& operator=(const weak_ptr& r);
#include <memory>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
struct B
{
static int count;
B() {++count;}
B(const B&) {++count;}
virtual ~B() {--count;}
};
int B::count = 0;
struct A
: public B
{
static int count;
A() {++count;}
A(const A& other) : B(other) {++count;}
~A() {--count;}
};
int A::count = 0;
int main(int, char**)
{
{
const std::shared_ptr<A> ps(new A);
const std::weak_ptr<A> pA(ps);
{
std::weak_ptr<A> pB;
pB = pA;
assert(B::count == 1);
assert(A::count == 1);
assert(pB.use_count() == 1);
assert(pA.use_count() == 1);
}
assert(pA.use_count() == 1);
assert(B::count == 1);
assert(A::count == 1);
}
assert(B::count == 0);
assert(A::count == 0);
{
const std::shared_ptr<A> ps(new A);
std::weak_ptr<A> pA(ps);
{
std::weak_ptr<A> pB;
pB = std::move(pA);
assert(B::count == 1);
assert(A::count == 1);
assert(pB.use_count() == 1);
}
assert(B::count == 1);
assert(A::count == 1);
}
assert(B::count == 0);
assert(A::count == 0);
return 0;
}
|
