Question

Greetings,

I’m able to find the size in bytes of a field after padding using the offsetof() macro.

Something like

struct a
{
  char r ;
  char s[ 255 ] ;
} ;

// the size in bytes of r after compiler padding is going to be
int lenR = offsetof( a, s ) - offsetof( a, r ) ;

But how can I find the size in bytes of the last field of a struct?

Answer 1

How about:

int lenS = sizeof(a) - offsetof(a, s);