| // Test that we can refer to the address of a base member of a null pointer |
| // to get its offset. The standard says that offsetof shall not be used on |
| // non-POD classes, but there seems to be no such restriction on the common |
| // implementation thereof. |
| |
| // Yes, this is bad, naughty, evil code. But it seems to be well-formed. |
| // So we'll just warn. |
| |
| // { dg-do run } |
| |
| struct A { int i; }; |
| |
| struct B: public A { |
| virtual void f (); |
| }; |
| |
| struct C: public B { }; |
| |
| int main () |
| { |
| return ((unsigned long) &((C*)0)->i) != sizeof(void*); // { dg-warning "offsetof|invalid" "" } |
| } |
