| private validateIsOrdered ( string $method ) : Pinq\Iterators\IOrderedIterator | ||
| $method | string | The called method name |
| return | Pinq\Iterators\IOrderedIterator | |
private function validateIsOrdered($method)
{
$innerIterator = $this->elements;
if (!$innerIterator instanceof Iterators\IOrderedIterator) {
throw new PinqException('Invalid call to %s: %s::%s must be called first.', $method, __CLASS__, 'orderBy');
}
return $innerIterator;
}