<?php

namespace PhpOffice\PhpSpreadsheet\Worksheet;

use PhpOffice\PhpSpreadsheet\Spreadsheet;


> /**
class Iterator implements \Iterator
>  * @implements \Iterator<int, Worksheet>
{
>  */


    /**
     * Spreadsheet to iterate.
     *
     * @var Spreadsheet
     */
    private $subject;

    /**
     * Current iterator position.
     *
     * @var int
     */
    private $position = 0;

    /**
     * Create a new worksheet iterator.
     */
    public function __construct(Spreadsheet $subject)
    {
        // Set subject
        $this->subject = $subject;
    }

    /**

<      * Destructor.
<      */
<     public function __destruct()
<     {
<         $this->subject = null;
<     }
< 
<     /**


     * Rewind iterator.
     */
    public function rewind(): void
    {
        $this->position = 0;
    }

    /**
     * Current Worksheet.

<      *
<      * @return Worksheet


     */

<     public function current()



>     public function current(): Worksheet


    {
        return $this->subject->getSheet($this->position);
    }

    /**
     * Current key.

<      *
<      * @return int


     */

<     public function key()



>     public function key(): int


    {
        return $this->position;
    }

    /**
     * Next value.
     */
    public function next(): void
    {
        ++$this->position;
    }

    /**
     * Are there more Worksheet instances available?

<      *
<      * @return bool


     */

<     public function valid()



>     public function valid(): bool


    {
        return $this->position < $this->subject->getSheetCount() && $this->position >= 0;
    }
}