public static void idx_aloop2 <T, T2>(idx <T> src0, idx <T2> src1, Action <eptr <T>, eptr <T2> > act)
where T : struct
where T2 : struct
{
var itr0 = new idxiter <T>();
var itr1 = new idxiter <T2>();
for (itr0.init(src0), itr1.init(src1); itr0.notdone(); itr0.next(), itr1.next())
{
act.Invoke(itr0.data, itr1.data);
}
}