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
|
// RUN: %check_clang_tidy %s readability-redundant-string-init %t
namespace std {
template <typename T>
class allocator {};
template <typename T>
class char_traits {};
template <typename C, typename T = std::char_traits<C>, typename A = std::allocator<C>>
struct basic_string {
basic_string();
basic_string(const basic_string&);
basic_string(const C *, const A &a = A());
~basic_string();
};
typedef basic_string<char> string;
typedef basic_string<wchar_t> wstring;
}
void f() {
std::string a = "";
// CHECK-MESSAGES: [[@LINE-1]]:15: warning: redundant string initialization [readability-redundant-string-init]
// CHECK-FIXES: std::string a;
std::string b("");
// CHECK-MESSAGES: [[@LINE-1]]:15: warning: redundant string initialization
// CHECK-FIXES: std::string b;
std::string c = R"()";
// CHECK-MESSAGES: [[@LINE-1]]:15: warning: redundant string initialization
// CHECK-FIXES: std::string c;
std::string d(R"()");
// CHECK-MESSAGES: [[@LINE-1]]:15: warning: redundant string initialization
// CHECK-FIXES: std::string d;
std::string u = "u";
std::string w("w");
std::string x = R"(x)";
std::string y(R"(y)");
std::string z;
}
void g() {
std::wstring a = L"";
// CHECK-MESSAGES: [[@LINE-1]]:16: warning: redundant string initialization
// CHECK-FIXES: std::wstring a;
std::wstring b(L"");
// CHECK-MESSAGES: [[@LINE-1]]:16: warning: redundant string initialization
// CHECK-FIXES: std::wstring b;
std::wstring c = LR"()";
// CHECK-MESSAGES: [[@LINE-1]]:16: warning: redundant string initialization
// CHECK-FIXES: std::wstring c;
std::wstring d(LR"()");
// CHECK-MESSAGES: [[@LINE-1]]:16: warning: redundant string initialization
// CHECK-FIXES: std::wstring d;
std::wstring u = L"u";
std::wstring w(L"w");
std::wstring x = LR"(x)";
std::wstring y(LR"(y)");
std::wstring z;
}
template <typename T>
void templ() {
std::string s = "";
// CHECK-MESSAGES: [[@LINE-1]]:15: warning: redundant string initialization
// CHECK-FIXES: std::string s;
}
#define M(x) x
#define N { std::string s = ""; }
// CHECK-FIXES: #define N { std::string s = ""; }
void h() {
templ<int>();
templ<double>();
M({ std::string s = ""; })
// CHECK-MESSAGES: [[@LINE-1]]:19: warning: redundant string initialization
// CHECK-FIXES: M({ std::string s; })
N
// CHECK-MESSAGES: [[@LINE-1]]:3: warning: redundant string initialization
// CHECK-FIXES: N
N
// CHECK-MESSAGES: [[@LINE-1]]:3: warning: redundant string initialization
// CHECK-FIXES: N
}
typedef std::string MyString;
#define STRING MyString
#define DECL_STRING(name, val) STRING name = val
void i() {
MyString a = "";
// CHECK-MESSAGES: [[@LINE-1]]:12: warning: redundant string initialization
// CHECK-FIXES: MyString a;
STRING b = "";
// CHECK-MESSAGES: [[@LINE-1]]:10: warning: redundant string initialization
// CHECK-FIXES: STRING b;
MyString c = "" "" "";
// CHECK-MESSAGES: [[@LINE-1]]:12: warning: redundant string initialization
// CHECK-FIXES: MyString c;
STRING d = "" "" "";
// CHECK-MESSAGES: [[@LINE-1]]:10: warning: redundant string initialization
// CHECK-FIXES: STRING d;
DECL_STRING(e, "");
// CHECK-MESSAGES: [[@LINE-1]]:15: warning: redundant string initialization
MyString f = "u";
STRING g = "u";
DECL_STRING(h, "u");
}
#define EMPTY_STR ""
void j() {
std::string a(EMPTY_STR);
// CHECK-MESSAGES: [[@LINE-1]]:15: warning: redundant string initialization
// CHECK-FIXES: std::string a;
std::string b = (EMPTY_STR);
// CHECK-MESSAGES: [[@LINE-1]]:15: warning: redundant string initialization
// CHECK-FIXES: std::string b;
std::string c(EMPTY_STR "u" EMPTY_STR);
}
void k() {
std::string a = "", b = "", c = "";
// CHECK-MESSAGES: [[@LINE-1]]:15: warning: redundant string initialization
// CHECK-MESSAGES: [[@LINE-2]]:23: warning: redundant string initialization
// CHECK-MESSAGES: [[@LINE-3]]:31: warning: redundant string initialization
// CHECK-FIXES: std::string a, b, c;
std::string d = "u", e = "u", f = "u";
}
// These cases should not generate warnings.
extern void Param1(std::string param = "");
extern void Param2(const std::string& param = "");
void Param3(std::string param = "") {}
void Param4(STRING param = "") {}
|
