1// RUN: %check_clang_tidy %s bugprone-sizeof-container %t -- -- -target x86_64-unknown-unknown
2
3namespace std {
4
5typedef unsigned int size_t;
6
7template <typename T>
8struct basic_string {
9 size_t size() const;
10};
11
12template <typename T>
13basic_string<T> operator+(const basic_string<T> &, const T *);
14
15typedef basic_string<char> string;
16
17template <typename T>
18struct vector {
19 size_t size() const;
20};
21
22// std::bitset<> is not a container. sizeof() is reasonable for it.
23template <size_t N>
24struct bitset {
25 size_t size() const;
26};
27
28// std::array<> is, well, an array. sizeof() is reasonable for it.
29template <typename T, size_t N>
30struct array {
31 size_t size() const;
32};
33
34class fake_container1 {
35 size_t size() const; // non-public
36};
37
38struct fake_container2 {
39 size_t size(); // non-const
40};
41
42}
43
44using std::size_t;
45
46#define ARRAYSIZE(a) \
47 ((sizeof(a) / sizeof(*(a))) / static_cast<size_t>(!(sizeof(a) % sizeof(*(a)))))
48
49#define ARRAYSIZE2(a) \
50 (((sizeof(a)) / (sizeof(*(a)))) / static_cast<size_t>(!((sizeof(a)) % (sizeof(*(a))))))
51
52struct string {
53 std::size_t size() const;
54};
55
56template<typename T>
57void g(T t) {
58 (void)sizeof(t);
59}
60
61void f() {
62 string s1;
63 std::string s2;
64 std::vector<int> v;
65
66 int a = 42 + sizeof(s1);
67// CHECK-MESSAGES: :[[@LINE-1]]:16: warning: sizeof() doesn't return the size of the container; did you mean .size()? [bugprone-sizeof-container]
68 a = 123 * sizeof(s2);
69// CHECK-MESSAGES: :[[@LINE-1]]:13: warning: sizeof() doesn't return the size
70 a = 45 + sizeof(s2 + "asdf");
71// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: sizeof() doesn't return the size
72 a = sizeof(v);
73// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: sizeof() doesn't return the size
74 a = sizeof(std::vector<int>{});
75// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: sizeof() doesn't return the size
76
77 a = sizeof(a);
78 a = sizeof(int);
79 a = sizeof(std::string);
80 a = sizeof(std::vector<int>);
81
82 g(t: s1);
83 g(t: s2);
84 g(t: v);
85
86 std::fake_container1 fake1;
87 std::fake_container2 fake2;
88 std::bitset<7> std_bitset;
89 std::array<int, 3> std_array;
90
91 a = sizeof(fake1);
92 a = sizeof(fake2);
93 a = sizeof(std_bitset);
94 a = sizeof(std_array);
95
96
97 std::string arr[3];
98 a = ARRAYSIZE(arr);
99 a = ARRAYSIZE2(arr);
100 a = sizeof(arr) / sizeof(arr[0]);
101
102 (void)a;
103}
104

source code of clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-container.cpp