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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Memory
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * Memory value container interface
  *
  * @category   Zend
  * @package    Zend_Memory
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 interface Zend_Memory_Container_Interface
 {
     /**
      * Get string value reference
      *
      * _Must_ be used for value access before PHP v 5.2
      * or _may_ be used for performance considerations
      *
      * @return &string
      */
     public function &getRef();
 
     /**
      * Signal, that value is updated by external code.
      *
      * Should be used together with getRef()
      */
     public function touch();
 
     /**
      * Lock object in memory.
      */
     public function lock();
 
     /**
      * Unlock object
      */
     public function unlock();
 
     /**
      * Return true if object is locked
      *
      * @return boolean
      */
     public function isLocked();
 }