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    <h3>Editing: CodeUnitCollectionIterator.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php declare(strict_types=1);
/*
 * This file is part of sebastian/code-unit.
 *
 * (c) Sebastian Bergmann &lt;sebastian@phpunit.de&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace SebastianBergmann\CodeUnit;

use Iterator;

final class CodeUnitCollectionIterator implements Iterator
{
    /**
     * @psalm-var list&lt;CodeUnit&gt;
     */
    private $codeUnits;

    /**
     * @var int
     */
    private $position = 0;

    public function __construct(CodeUnitCollection $collection)
    {
        $this-&gt;codeUnits = $collection-&gt;asArray();
    }

    public function rewind(): void
    {
        $this-&gt;position = 0;
    }

    public function valid(): bool
    {
        return isset($this-&gt;codeUnits[$this-&gt;position]);
    }

    public function key(): int
    {
        return $this-&gt;position;
    }

    public function current(): CodeUnit
    {
        return $this-&gt;codeUnits[$this-&gt;position];
    }

    public function next(): void
    {
        $this-&gt;position++;
    }
}
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