<?php

namespace PhpOffice\PhpSpreadsheet\Worksheet;

use Iterator;

> use PhpOffice\PhpSpreadsheet\Cell\Cell;

> use PhpOffice\PhpSpreadsheet\Collection\Cells;


abstract class CellIterator implements Iterator

> /**
{
>  * @template TKey
    /**
>  *
     * Worksheet to iterate.
>  * @implements Iterator<TKey, Cell>
     *
>  */


     * @var Worksheet

>     public const TREAT_NULL_VALUE_AS_EMPTY_CELL = 1;
     */
> 
    protected $worksheet;
>     public const TREAT_EMPTY_STRING_AS_EMPTY_CELL = 2;

> 


    /**

>      * Cell Collection to iterate.
     * Iterate only existing cells.
>      *
     *
>      * @var Cells
     * @var bool
>      */
     */
>     protected $cellCollection;
    protected $onlyExistingCells = false;
> 

>     /**


    /**
     * Destructor.
     */
    public function __destruct()
    {

<         $this->worksheet = null;



>         // @phpstan-ignore-next-line
>         $this->worksheet = $this->cellCollection = null;


    }

    /**
     * Get loop only existing cells.

<      *
<      * @return bool


     */

<     public function getIterateOnlyExistingCells()



>     public function getIterateOnlyExistingCells(): bool


    {
        return $this->onlyExistingCells;
    }

    /**
     * Validate start/end values for "IterateOnlyExistingCells" mode, and adjust if necessary.
     */
    abstract protected function adjustForExistingOnlyRange();

    /**
     * Set the iterator to loop only existing cells.

<      *
<      * @param bool $value


     */

<     public function setIterateOnlyExistingCells($value): void



>     public function setIterateOnlyExistingCells(bool $value): void


    {
        $this->onlyExistingCells = (bool) $value;

        $this->adjustForExistingOnlyRange();
    }
}