#include class c{ public: char * f; }; static class sss: public c{ public: float m; } sss; #define _offsetof(st,f) ((char *)&((st *) 16)->f - (char *) 16) int main (void) { printf ("++Class with float inhereting class with pointer:\n"); printf ("size=%d,align=%d\n", sizeof (sss), __alignof__ (sss)); printf ("offset-pointer=%d,offset-float=%d,\nalign-pointer=%d,align-float=%d\n", _offsetof (class sss, f), _offsetof (class sss, m), __alignof__ (sss.f), __alignof__ (sss.m)); return 0; }