gcc/testsuite/g++.dg/warn/Wconversion-null-2.C

   1 // { dg-do link  }
   2 // { dg-options "" }
   3
   4 #include <cstddef>
   5
   6 void g(int) {}
   7 void g(long) {}
   8 extern void g(void*);
   9
  10 template <int I>
  11 void h() {}
  12
  13 void k(int) {}
  14
  15 template <class T>
  16 void l(T);
  17
  18 template <>
  19 void l(int) {}
  20
  21 template <>
  22 void l(long) {}
  23
  24 int main()
  25 {
  26   int i = NULL; // { dg-warning "" } converting NULL to non-pointer type
  27   float z = NULL; // { dg-warning "" } converting NULL to non-pointer type
  28   int a[2];
  29
  30   i != NULL; // { dg-warning "" } NULL used in arithmetic
  31   NULL != z; // { dg-warning "" } NULL used in arithmetic
  32   k != NULL; // No warning: decay conversion
  33   NULL != a; // Likewise.
  34   -NULL;     // { dg-warning "" } converting NULL to non-pointer type
  35   +NULL;     // { dg-warning "" } converting NULL to non-pointer type
  36   ~NULL;     // { dg-warning "" } converting NULL to non-pointer type
  37   a[NULL] = 3; // { dg-warning "" } converting NULL to non-pointer-type
  38   i = NULL;  // { dg-warning "" } converting NULL to non-pointer type
  39   z = NULL;  // { dg-warning "" } converting NULL to non-pointer type
  40   k(NULL);   // { dg-warning "" } converting NULL to int
  41   g(NULL);   // { dg-warning "" } converting NULL to int
  42   h<NULL>(); // No warning: NULL bound to integer template parameter
  43   l(NULL);   // { dg-warning "" } converting NULL to int
  44   NULL && NULL; // No warning: converting NULL to bool is OK
  45 }