How about this:
struct A {
int z;
};
struct B {
struct A a;
int y;
};
struct C {
struct B b;
int x;
};
struct C abc;
main ()
{
printf ("&abc \t== 0x%08xd\n", &abc);
printf ("&abc.b\t== 0x%08xd\n", &abc.b);
printf ("&abc.b.a\t== 0x%08xd\n", &abc.b.a);
printf ("&abc.b.a.z\t== 0x%08xd\n", &abc.b.a.z);
}
gcc t.c -o t
./t
&abc == 0x080495bcd
&abc.b == 0x080495bcd
&abc.b.a == 0x080495bcd
&abc.b.a.z == 0x080495bcd
In other words, it is perfectly reasonable for objects of different
types to have the same address (note the above was C, not C++).
--pete
