1 // { dg-do compile }
2 // { dg-options "-Wparentheses" }
3
4 // Warnings for assignments used as truth-values when using classes.
5 // Like Wparentheses-1.C, but with a class.
6
7 int foo (int);
8
9 class C
10 {
11 public:
C()12 C()
13 : b(0)
14 { }
15
16 // Use default assignment constructor.
17
18 // Provide conversion to bool so that an instance of this class will
19 // work as a condition.
20 operator bool() const
21 { return b != 0; }
22
23 private:
24 int b;
25 };
26
27 C a, b, c;
28 bool d;
29
30 void
bar(void)31 bar (void)
32 {
33 if (a = b) // { dg-warning "assignment" "correct warning" }
34 foo (0);
35 if ((a = b))
36 foo (1);
37 if (a = a) // { dg-warning "assignment" "correct warning" }
38 foo (2);
39 if ((a = a))
40 foo (3);
41 if (b = c) // { dg-warning "assignment" "correct warning" }
42 foo (4);
43 else
44 foo (5);
45 if ((b = c))
46 foo (6);
47 else
48 foo (7);
49 if (b = b) // { dg-warning "assignment" "correct warning" }
50 foo (8);
51 else
52 foo (9);
53 if ((b = b))
54 foo (10);
55 else
56 foo (11);
57 while (c = b) // { dg-warning "assignment" "correct warning" }
58 foo (12);
59 while ((c = b))
60 foo (13);
61 while (c = c) // { dg-warning "assignment" "correct warning" }
62 foo (14);
63 while ((c = c))
64 foo (15);
65 do foo (16); while (a = b); // { dg-warning "assignment" "correct warning" }
66 do foo (17); while ((a = b));
67 do foo (18); while (a = a); // { dg-warning "assignment" "correct warning" }
68 do foo (19); while ((a = a));
69 for (;c = b;) // { dg-warning "assignment" "correct warning" }
70 foo (20);
71 for (;(c = b);)
72 foo (21);
73 for (;c = c;) // { dg-warning "assignment" "correct warning" }
74 foo (22);
75 for (;(c = c);)
76 foo (23);
77 d = a = b; // { dg-warning "assignment" "correct warning" }
78 foo (24);
79 d = (a = b);
80 foo (25);
81 d = a = a; // { dg-warning "assignment" "correct warning" }
82 foo (26);
83 d = (a = a);
84 foo (27);
85 if (C(a))
86 foo (28);
87 }
88
89 bool
bar1(void)90 bar1 (void)
91 {
92 return a = b; // { dg-warning "assignment" "correct warning" }
93 }
94
95 bool
bar2(void)96 bar2 (void)
97 {
98 return (a = b);
99 }
100
101 bool
bar3(void)102 bar3 (void)
103 {
104 return a = a; // { dg-warning "assignment" "correct warning" }
105 }
106
107 bool
bar4(void)108 bar4 (void)
109 {
110 return (a = a);
111 }
112