protected Table __union(Table t,int offset){
  offset+=bb_pos;
  t.bb_pos=offset + bb.getInt(offset);
  t.bb=bb;
  return t;
}

protected Table __union ( Table t , int offset ) { offset += bb_pos ; t . bb_pos = offset + bb . getInt ( offset ) ; t . bb = bb ; return t ; }
initialize any table - derived type to point to the union at the given ` offset ` .
