<?php
/*

<  * Copyright 2017 MongoDB, Inc.



>  * Copyright 2017-present MongoDB, Inc.


 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *

<  *   http://www.apache.org/licenses/LICENSE-2.0



>  *   https://www.apache.org/licenses/LICENSE-2.0


 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace MongoDB\Model;

use Closure;
use Iterator;
use IteratorIterator;

> use ReturnTypeWillChange;


use Traversable;

/**
 * Iterator to apply a callback before returning an element
 *
 * @internal
 */
class CallbackIterator implements Iterator
{
    /** @var Closure */
    private $callback;


<     /** @var IteratorIterator */



>     /** @var Iterator */


    private $iterator;

    public function __construct(Traversable $traversable, Closure $callback)
    {

<         $this->iterator = new IteratorIterator($traversable);



>         $this->iterator = $traversable instanceof Iterator ? $traversable : new IteratorIterator($traversable);


        $this->callback = $callback;
    }

    /**

<      * @see http://php.net/iterator.current



>      * @see https://php.net/iterator.current


     * @return mixed
     */

>     #[ReturnTypeWillChange]


    public function current()
    {
        return ($this->callback)($this->iterator->current());
    }

    /**

<      * @see http://php.net/iterator.key



>      * @see https://php.net/iterator.key


     * @return mixed
     */

>     #[ReturnTypeWillChange]


    public function key()
    {
        return $this->iterator->key();
    }

    /**

<      * @see http://php.net/iterator.next
<      * @return void



>      * @see https://php.net/iterator.next


     */

<     public function next()



>     public function next(): void


    {
        $this->iterator->next();
    }

    /**

<      * @see http://php.net/iterator.rewind
<      * @return void



>      * @see https://php.net/iterator.rewind


     */

<     public function rewind()



>     public function rewind(): void


    {
        $this->iterator->rewind();
    }

    /**

<      * @see http://php.net/iterator.valid
<      * @return boolean



>      * @see https://php.net/iterator.valid


     */

<     public function valid()



>     public function valid(): bool


    {
        return $this->iterator->valid();
    }
}