1// RUN: %check_clang_tidy %s readability-delete-null-pointer %t -- -- -fno-delayed-template-parsing
2
3#define NULL 0
4
5template <typename T>
6struct Templ {
7 void foo() {
8 // t1
9 if (mem) // t2
10 delete mem;
11 // CHECK-MESSAGES: :[[@LINE-2]]:5: warning: 'if' statement is unnecessary;
12 // CHECK-FIXES: // t1
13 // CHECK-FIXES-NEXT: // t2
14 // CHECK-FIXES-NEXT: delete mem;
15 }
16 T mem;
17};
18
19template <typename T>
20struct TemplPtr {
21 void foo() {
22 // t3
23 if (mem) // t4
24 delete mem;
25 // CHECK-MESSAGES: :[[@LINE-2]]:5: warning: 'if' statement is unnecessary;
26 // CHECK-FIXES: // t3
27 // CHECK-FIXES-NEXT: // t4
28 // CHECK-FIXES-NEXT: delete mem;
29 }
30 T *mem;
31};
32
33void instantiate() {
34 Templ<int *> ti2;
35 ti2.foo();
36 TemplPtr<int> ti3;
37 ti3.foo();
38}
39
40template <typename T>
41struct NeverInstantiated {
42 void foo() {
43 // t1
44 if (mem) // t2
45 delete mem;
46 // CHECK-MESSAGES: :[[@LINE-2]]:5: warning: 'if' statement is unnecessary;
47 // CHECK-FIXES: // t1
48 // CHECK-FIXES-NEXT: // t2
49 // CHECK-FIXES-NEXT: delete mem;
50 }
51 T mem;
52};
53
54template <typename T>
55struct NeverInstantiatedPtr {
56 void foo() {
57 // t3
58 if (mem) // t4
59 delete mem;
60 // CHECK-MESSAGES: :[[@LINE-2]]:5: warning: 'if' statement is unnecessary;
61 // CHECK-FIXES: // t3
62 // CHECK-FIXES-NEXT: // t4
63 // CHECK-FIXES-NEXT: delete mem;
64 }
65 T *mem;
66};
67
68void f() {
69 int *ps = 0;
70 if (ps /**/) // #0
71 delete ps;
72 // CHECK-MESSAGES: :[[@LINE-2]]:3: warning: 'if' statement is unnecessary; deleting null pointer has no effect [readability-delete-null-pointer]
73
74 // CHECK-FIXES: int *ps = 0;
75 // CHECK-FIXES-NEXT: // #0
76 // CHECK-FIXES-NEXT: delete ps;
77
78 int *p = 0;
79
80 // #1
81 if (p) { // #2
82 delete p;
83 } // #3
84 // CHECK-MESSAGES: :[[@LINE-3]]:3: warning: 'if' statement is unnecessary; deleting null pointer has no effect [readability-delete-null-pointer]
85
86 // CHECK-FIXES: // #1
87 // CHECK-FIXES-NEXT: // #2
88 // CHECK-FIXES-NEXT: delete p;
89 // CHECK-FIXES-NEXT: // #3
90
91 int *p2 = new int[3];
92 // #4
93 if (p2) // #5
94 delete[] p2;
95 // CHECK-MESSAGES: :[[@LINE-2]]:3: warning: 'if' statement is unnecessary;
96
97 // CHECK-FIXES: // #4
98 // CHECK-FIXES-NEXT: // #5
99 // CHECK-FIXES-NEXT: delete[] p2;
100
101 int *p3 = 0;
102 if (NULL != p3) {
103 // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: 'if' statement is unnecessary;
104 delete p3;
105 }
106 // CHECK-FIXES-NOT: if (NULL != p3) {
107 // CHECK-FIXES: delete p3;
108
109 int *p4 = nullptr;
110 if (p4 != nullptr) {
111 // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: 'if' statement is unnecessary;
112 delete p4;
113 }
114 // CHECK-FIXES-NOT: if (p4 != nullptr) {
115 // CHECK-FIXES: delete p4;
116
117 char *c;
118 if (c != 0) {
119 // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: 'if' statement is unnecessary;
120 delete c;
121 }
122 // CHECK-FIXES-NOT: if (c != 0) {
123 // CHECK-FIXES: delete c;
124
125 char *c2;
126 if (c2) {
127 // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: 'if' statement is unnecessary;
128 // CHECK-FIXES: } else {
129 // CHECK-FIXES: c2 = c;
130 delete c2;
131 } else {
132 c2 = c;
133 }
134 struct A {
135 void foo() {
136 if (mp) // #6
137 delete mp;
138 // CHECK-MESSAGES: :[[@LINE-2]]:7: warning: 'if' statement is unnecessary; deleting null pointer has no effect [readability-delete-null-pointer]
139 // CHECK-FIXES: // #6
140 // CHECK-FIXES-NEXT: delete mp;
141 }
142 int *mp;
143 };
144}
145
146void g() {
147 int *p5, *p6;
148 if (p5)
149 delete p6;
150
151 if (p5 && p6)
152 delete p5;
153
154 if (p6) {
155 int x = 5;
156 delete p6;
157 }
158}
159

source code of clang-tools-extra/test/clang-tidy/checkers/readability/delete-null-pointer.cpp