#include <net/if.h>

#define F(t,n) {t *y = &x.;;}

#define C(n) switch(n){case n:;}

static void f()

{

{

struct if_nameindex x;

F(unsigned, if_index)

F(char*, if_name)

}

C(IF_NAMESIZE)

{void(*p)(struct if_nameindex*) = if_freenameindex;}

{char*(*p)(unsigned,char*) = if_indextoname;}

{struct if_nameindex*(*p)(void) = if_nameindex;}

{unsigned(*p)(const char*) = if_nametoindex;}

}