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
|
// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/fxcrt/shared_copy_on_write.h"
#include <map>
#include <string>
#include "testing/gtest/include/gtest/gtest.h"
namespace fxcrt {
namespace {
class Observer {
public:
void OnConstruct(const std::string& name) { construction_counts_[name]++; }
void OnDestruct(const std::string& name) { destruction_counts_[name]++; }
int GetConstructionCount(const std::string& name) {
return construction_counts_[name];
}
int GetDestructionCount(const std::string& name) {
return destruction_counts_[name];
}
private:
std::map<std::string, int> construction_counts_;
std::map<std::string, int> destruction_counts_;
};
class Object {
public:
Object(Observer* observer, const std::string& name)
: name_(name), observer_(observer) {
observer->OnConstruct(name_);
}
Object(const Object& that) : name_(that.name_), observer_(that.observer_) {
observer_->OnConstruct(name_);
}
~Object() { observer_->OnDestruct(name_); }
private:
std::string name_;
Observer* observer_;
};
} // namespace
TEST(SharedCopyOnWrite, Null) {
Observer observer;
{
SharedCopyOnWrite<Object> ptr;
EXPECT_EQ(nullptr, ptr.GetObject());
}
}
TEST(SharedCopyOnWrite, Copy) {
Observer observer;
{
SharedCopyOnWrite<Object> ptr1;
ptr1.Emplace(&observer, std::string("one"));
{
SharedCopyOnWrite<Object> ptr2 = ptr1;
EXPECT_EQ(1, observer.GetConstructionCount("one"));
EXPECT_EQ(0, observer.GetDestructionCount("one"));
}
{
SharedCopyOnWrite<Object> ptr3(ptr1);
EXPECT_EQ(1, observer.GetConstructionCount("one"));
EXPECT_EQ(0, observer.GetDestructionCount("one"));
}
EXPECT_EQ(1, observer.GetConstructionCount("one"));
EXPECT_EQ(0, observer.GetDestructionCount("one"));
}
EXPECT_EQ(1, observer.GetDestructionCount("one"));
}
TEST(SharedCopyOnWrite, AssignOverOld) {
Observer observer;
{
SharedCopyOnWrite<Object> ptr1;
ptr1.Emplace(&observer, std::string("one"));
ptr1.Emplace(&observer, std::string("two"));
EXPECT_EQ(1, observer.GetConstructionCount("one"));
EXPECT_EQ(1, observer.GetConstructionCount("two"));
EXPECT_EQ(1, observer.GetDestructionCount("one"));
EXPECT_EQ(0, observer.GetDestructionCount("two"));
}
EXPECT_EQ(1, observer.GetDestructionCount("two"));
}
TEST(SharedCopyOnWrite, AssignOverRetained) {
Observer observer;
{
SharedCopyOnWrite<Object> ptr1;
ptr1.Emplace(&observer, std::string("one"));
SharedCopyOnWrite<Object> ptr2(ptr1);
ptr1.Emplace(&observer, std::string("two"));
EXPECT_EQ(1, observer.GetConstructionCount("one"));
EXPECT_EQ(1, observer.GetConstructionCount("two"));
EXPECT_EQ(0, observer.GetDestructionCount("one"));
EXPECT_EQ(0, observer.GetDestructionCount("two"));
}
EXPECT_EQ(1, observer.GetDestructionCount("one"));
EXPECT_EQ(1, observer.GetDestructionCount("two"));
}
TEST(SharedCopyOnWrite, GetModify) {
Observer observer;
{
SharedCopyOnWrite<Object> ptr;
EXPECT_NE(nullptr, ptr.GetPrivateCopy(&observer, std::string("one")));
EXPECT_EQ(1, observer.GetConstructionCount("one"));
EXPECT_EQ(0, observer.GetDestructionCount("one"));
EXPECT_NE(nullptr, ptr.GetPrivateCopy(&observer, std::string("one")));
EXPECT_EQ(1, observer.GetConstructionCount("one"));
EXPECT_EQ(0, observer.GetDestructionCount("one"));
{
SharedCopyOnWrite<Object> other(ptr);
EXPECT_NE(nullptr, ptr.GetPrivateCopy(&observer, std::string("one")));
EXPECT_EQ(2, observer.GetConstructionCount("one"));
EXPECT_EQ(0, observer.GetDestructionCount("one"));
}
EXPECT_EQ(2, observer.GetConstructionCount("one"));
EXPECT_EQ(1, observer.GetDestructionCount("one"));
}
EXPECT_EQ(2, observer.GetDestructionCount("one"));
}
} // namespace fxcrt
|
