gcc/testsuite/g++.dg/warn/Wparentheses-23.C

   1 // { dg-do compile }
   2 // { dg-options "-Wparentheses" }
   3
   4 // Template version of Wparentheses-22.C.
   5
   6 int foo (int);
   7
   8 class C
   9 {
  10  public:
  11   C()
  12     : b(0)
  13   { }
  14
  15   // Use default assignment constructor.
  16
  17   // Provide conversion to bool so that an instance of this class will
  18   // work as a condition.
  19   operator bool() const
  20   { return b != 0; }
  21
  22  private:
  23   int b;
  24 };
  25
  26 C a, b, c;
  27 bool d;
  28
  29 template<class T>
  30 void
  31 bar (T)
  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 template<class T>
  90 bool
  91 bar1 (T)
  92 {
  93   return a = b; // { dg-warning "assignment" "correct warning" }
  94 }
  95
  96 template<class T>
  97 bool
  98 bar2 (T)
  99 {
 100   return (a = b);
 101 }
 102
 103 template<class T>
 104 bool
 105 bar3 (T)
 106 {
 107   return a = a; // { dg-warning "assignment" "correct warning" }
 108 }
 109
 110 template<class T>
 111 bool
 112 bar4 (T)
 113 {
 114   return (a = a);
 115 }
 116
 117 template void bar<int> (int); // { dg-warning "instantiated" }
 118 template bool bar1<int> (int); // { dg-warning "instantiated" }
 119 template bool bar2<int> (int);
 120 template bool bar3<int> (int); // { dg-warning "instantiated" }
 121 template bool bar4<int> (int);