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* This file is part of the Symfony package.
* (c) Fabien Potencier <email@example.com>
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
* @author Jérémy Derussé <firstname.lastname@example.org>
class LazyIterator implements \IteratorAggregate
public function __construct(callable $iteratorFactory)
$this->iteratorFactory = $iteratorFactory;
public function getIterator(): \Traversable
yield from ($this->iteratorFactory)();