public function union(Basic $hll)
{
$registers = $hll->getRegisters();
// The set to be unioned may be bigger than this initial set so we need to increase this set to match
if (count($this->registers) < ($newCount = count($registers))) {
$this->resize($newCount);
}
for ($i = 0; $i < count($registers); $i++) {
if (!isset($this->registers[$i]) || $this->registers[$i] < $registers[$i]) {
$this->registers[$i] = $registers[$i];
}
}
}