CellIterator.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Worksheet;

use Iterator;

abstract class CellIterator implements Iterator
{
    protected $worksheet;

    protected $onlyExistingCells = false;

    public function __destruct()
    {
        // @phpstan-ignore-next-line
        $this->worksheet = null;
    }

    public function getIterateOnlyExistingCells(): bool
    {
        return $this->onlyExistingCells;
    }

    abstract protected function adjustForExistingOnlyRange();

    public function setIterateOnlyExistingCells(bool $value): void
    {
        $this->onlyExistingCells = (bool) $value;

        $this->adjustForExistingOnlyRange();
    }
}