指针比较

 1 #include <stdio.h>
 2 class A{
 3 public:
 4     int a;
 5 };
 6 
 7 class B{
 8 public:
 9     int b;
10 };
11 
12 class C: public A, public B{
13 public:
14     int c;
15 };
16 int main(int argc, char **argv)
17 {
18     C *pc = new C();
19     A *pa = pc;
20     B *pb = pc;
21     void *p = (void *)pc;
22     //by now, pc == pa is true, pc == pb is true, pa == pb not valid, compile error
23     // p == pc is true , p == pa is true(compiler dependent), p == pb is false  (all of them are raw pointer comparison)
24     return 0;
25 }