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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/RefPtr.h"
#include "mozilla/RefCounted.h"
#include <type_traits>
using mozilla::RefCounted;
class Foo : public RefCounted<Foo> {
public:
MOZ_DECLARE_REFCOUNTED_TYPENAME(Foo)
Foo() : mDead(false) {}
static int sNumDestroyed;
~Foo() {
MOZ_RELEASE_ASSERT(!mDead);
mDead = true;
sNumDestroyed++;
}
private:
bool mDead;
};
int Foo::sNumDestroyed;
struct Bar : public Foo {};
already_AddRefed<Foo> NewFoo() {
RefPtr<Foo> f(new Foo());
return f.forget();
}
already_AddRefed<Foo> NewBar() {
RefPtr<Bar> bar = new Bar();
return bar.forget();
}
void GetNewFoo(Foo** aFoo) {
*aFoo = new Bar();
// Kids, don't try this at home
(*aFoo)->AddRef();
}
void GetNewFoo(RefPtr<Foo>* aFoo) { *aFoo = new Bar(); }
already_AddRefed<Foo> GetNullFoo() { return 0; }
int main() {
MOZ_RELEASE_ASSERT(0 == Foo::sNumDestroyed);
{
RefPtr<Foo> f = new Foo();
MOZ_RELEASE_ASSERT(f->refCount() == 1);
}
MOZ_RELEASE_ASSERT(1 == Foo::sNumDestroyed);
{
RefPtr f1 = NewFoo();
static_assert(std::is_same_v<decltype(f1), RefPtr<Foo>>);
RefPtr f2(NewFoo());
static_assert(std::is_same_v<decltype(f2), RefPtr<Foo>>);
MOZ_RELEASE_ASSERT(1 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(3 == Foo::sNumDestroyed);
{
RefPtr<Foo> b = NewBar();
MOZ_RELEASE_ASSERT(3 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(4 == Foo::sNumDestroyed);
{
RefPtr<Foo> f1;
{
f1 = new Foo();
RefPtr<Foo> f2(f1);
RefPtr<Foo> f3 = f2;
MOZ_RELEASE_ASSERT(4 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(4 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(5 == Foo::sNumDestroyed);
{
{
RefPtr<Foo> f = new Foo();
RefPtr<Foo> g = f.forget();
}
MOZ_RELEASE_ASSERT(6 == Foo::sNumDestroyed);
}
{
RefPtr<Foo> f = new Foo();
GetNewFoo(getter_AddRefs(f));
MOZ_RELEASE_ASSERT(7 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(8 == Foo::sNumDestroyed);
{
RefPtr<Foo> f = new Foo();
GetNewFoo(&f);
MOZ_RELEASE_ASSERT(9 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(10 == Foo::sNumDestroyed);
{
RefPtr<Foo> f1 = new Bar();
}
MOZ_RELEASE_ASSERT(11 == Foo::sNumDestroyed);
{
RefPtr f = GetNullFoo();
static_assert(std::is_same_v<decltype(f), RefPtr<Foo>>);
MOZ_RELEASE_ASSERT(11 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(11 == Foo::sNumDestroyed);
{
RefPtr<Foo> f = new Foo();
auto& alias = f;
f = std::move(static_cast<RefPtr<Foo>&>(alias));
MOZ_RELEASE_ASSERT(11 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(12 == Foo::sNumDestroyed);
{
bool condition = true;
const auto f =
condition ? mozilla::MakeRefPtr<Bar>() : mozilla::MakeRefPtr<Foo>();
MOZ_RELEASE_ASSERT(f);
}
return 0;
}
|
