1 // Copyright 2022 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/memory/values_equivalent.h"
6
7 #include "base/memory/raw_ptr.h"
8 #include "base/memory/ref_counted.h"
9 #include "base/memory/scoped_refptr.h"
10 #include "testing/gtest/include/gtest/gtest.h"
11
12 namespace base {
13
TEST(ValuesEquivalentTest,Comparisons)14 TEST(ValuesEquivalentTest, Comparisons) {
15 int a = 1234;
16 int b1 = 5678;
17 int b2 = 5678;
18
19 EXPECT_TRUE(ValuesEquivalent<int>(nullptr, nullptr));
20 EXPECT_FALSE(ValuesEquivalent<int>(&a, nullptr));
21 EXPECT_FALSE(ValuesEquivalent<int>(nullptr, &a));
22 EXPECT_FALSE(ValuesEquivalent(&a, &b1));
23 EXPECT_TRUE(ValuesEquivalent(&a, &a));
24 EXPECT_TRUE(ValuesEquivalent(&b1, &b2));
25 }
26
TEST(ValuesEquivalentTest,UniquePtr)27 TEST(ValuesEquivalentTest, UniquePtr) {
28 auto a = std::make_unique<int>(1234);
29 auto b1 = std::make_unique<int>(5678);
30 auto b2 = std::make_unique<int>(5678);
31
32 EXPECT_TRUE(ValuesEquivalent(std::unique_ptr<int>(), std::unique_ptr<int>()));
33 EXPECT_FALSE(ValuesEquivalent(a, std::unique_ptr<int>()));
34 EXPECT_FALSE(ValuesEquivalent(std::unique_ptr<int>(), a));
35 EXPECT_FALSE(ValuesEquivalent(a, b1));
36 EXPECT_TRUE(ValuesEquivalent(a, a));
37 EXPECT_TRUE(ValuesEquivalent(b1, b2));
38 }
39
TEST(ValuesEquivalentTest,ScopedRefPtr)40 TEST(ValuesEquivalentTest, ScopedRefPtr) {
41 struct Wrapper : public RefCounted<Wrapper> {
42 explicit Wrapper(int value) : value(value) {}
43 int value;
44 bool operator==(const Wrapper& other) const { return value == other.value; }
45
46 protected:
47 friend class RefCounted<Wrapper>;
48 virtual ~Wrapper() = default;
49 };
50
51 auto a = MakeRefCounted<Wrapper>(1234);
52 auto b1 = MakeRefCounted<Wrapper>(5678);
53 auto b2 = MakeRefCounted<Wrapper>(5678);
54
55 EXPECT_TRUE(
56 ValuesEquivalent(scoped_refptr<Wrapper>(), scoped_refptr<Wrapper>()));
57 EXPECT_FALSE(ValuesEquivalent(a, scoped_refptr<Wrapper>()));
58 EXPECT_FALSE(ValuesEquivalent(scoped_refptr<Wrapper>(), a));
59 EXPECT_FALSE(ValuesEquivalent(a, b1));
60 EXPECT_TRUE(ValuesEquivalent(a, a));
61 EXPECT_TRUE(ValuesEquivalent(b1, b2));
62 }
63
TEST(ValuesEquivalentTest,CapitalGetPtr)64 TEST(ValuesEquivalentTest, CapitalGetPtr) {
65 class IntPointer {
66 public:
67 explicit IntPointer(int* pointer) : pointer_(pointer) {}
68 const int* Get() const { return pointer_; }
69
70 private:
71 raw_ptr<int> pointer_ = nullptr;
72 };
73
74 auto a = 1234;
75 auto b1 = 5678;
76 auto b2 = 5678;
77
78 EXPECT_TRUE(ValuesEquivalent(IntPointer(nullptr), IntPointer(nullptr)));
79 EXPECT_FALSE(ValuesEquivalent(IntPointer(&a), IntPointer(nullptr)));
80 EXPECT_FALSE(ValuesEquivalent(IntPointer(nullptr), IntPointer(&a)));
81 EXPECT_FALSE(ValuesEquivalent(IntPointer(&a), IntPointer(&b1)));
82 EXPECT_TRUE(ValuesEquivalent(IntPointer(&a), IntPointer(&a)));
83 EXPECT_TRUE(ValuesEquivalent(IntPointer(&b1), IntPointer(&b2)));
84 }
85
TEST(ValuesEquivalentTest,BypassEqualsOperator)86 TEST(ValuesEquivalentTest, BypassEqualsOperator) {
87 struct NeverEqual {
88 bool operator==(const NeverEqual& other) const { return false; }
89 } a, b;
90
91 ASSERT_FALSE(a == a);
92 ASSERT_FALSE(a == b);
93
94 EXPECT_TRUE(ValuesEquivalent(&a, &a));
95 EXPECT_FALSE(ValuesEquivalent(&a, &b));
96 }
97
TEST(ValuesEquavalentTest,Predicate)98 TEST(ValuesEquavalentTest, Predicate) {
99 auto is_same_or_next = [](int a, int b) { return a == b || a == b + 1; };
100 int x = 1;
101 int y = 2;
102 int z = 3;
103
104 EXPECT_TRUE(ValuesEquivalent(&x, &x, is_same_or_next));
105 EXPECT_FALSE(ValuesEquivalent(&x, &y, is_same_or_next));
106 EXPECT_FALSE(ValuesEquivalent(&x, &z, is_same_or_next));
107 EXPECT_TRUE(ValuesEquivalent(&y, &x, is_same_or_next));
108 EXPECT_FALSE(ValuesEquivalent(&y, &z, is_same_or_next));
109 EXPECT_FALSE(ValuesEquivalent(&z, &x, is_same_or_next));
110 EXPECT_TRUE(ValuesEquivalent(&z, &y, is_same_or_next));
111 EXPECT_TRUE(ValuesEquivalent<int>(nullptr, nullptr, is_same_or_next));
112 EXPECT_FALSE(ValuesEquivalent<int>(&x, nullptr, is_same_or_next));
113 EXPECT_FALSE(ValuesEquivalent<int>(nullptr, &x, is_same_or_next));
114 }
115
116 } // namespace base
117