yiiapi/framework/collections/CQueue.php

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<?php
/**
 * This file contains classes implementing the queue feature.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright 2008-2013 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CQueue implements a queue.
 *
 * The typical queue operations are implemented, which include
 * {@link enqueue()}, {@link dequeue()} and {@link peek()}. In addition,
 * {@link contains()} can be used to check if an item is contained
 * in the queue. To obtain the number of the items in the queue,
 * check the {@link getCount Count} property.
 *
 * Items in the queue may be traversed using foreach as follows,
 * <pre>
 * foreach($queue as $item) ...
 * </pre>
 *
 * @property Iterator $iterator An iterator for traversing the items in the queue.
 * @property integer $count The number of items in the queue.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package system.collections
 * @since 1.0
 */
class CQueue extends CComponent implements IteratorAggregate,Countable
{
	/**
	 * internal data storage
	 * @var array
	 */
	private $_d=array();
	/**
	 * number of items
	 * @var integer
	 */
	private $_c=0;

	/**
	 * Constructor.
	 * Initializes the queue with an array or an iterable object.
	 * @param array $data the initial data. Default is null, meaning no initialization.
	 * @throws CException If data is not null and neither an array nor an iterator.
	 */
	public function __construct($data=null)
	{
		if($data!==null)
			$this->copyFrom($data);
	}

	/**
	 * @return array the list of items in queue
	 */
	public function toArray()