public function minus($value)
{
if ($value < 0) {
return $this->plus(-1 * $value);
}
if (!is_int($value)) {
throw new InvalidArgumentException('plus() takes an integer');
}
if ($value == 0) {
return clone $this;
}
// check boundaries
try {
$first_ip = $this->first_ip->minus(gmp_mul($value, $this->getNbAddresses()));
return new $this->class($first_ip, $this->prefix);
} catch (InvalidArgumentException $e) {
throw new OutOfBoundsException($e->getMessage());
}
}
