On Tue, Jan 31, 2012 at 07:32:52PM +0000, Alexander Nasonov wrote: > What about something like this (untested)? > > /* > * Return a size of a structure s with flexible-array member m > * with n elements. > */ > #define sizeof_fam(s, m, n) (sizeof(s) + sizeof(((s *)NULL)->m[0]) * (n))
That's still not necessarily optimal, depending on the padding rules of the platform. You want to do offsetof(s, m[0]) + n * sizeof((s*)NULL->m[0]). Joerg
