1<?php 2 3/** @file emptyiterator.inc 4 * @ingroup SPL 5 * @brief class EmptyIterator 6 * @author Marcus Boerger 7 * @date 2003 - 2009 8 * 9 * SPL - Standard PHP Library 10 */ 11 12/** @ingroup SPL 13 * @brief An empty Iterator 14 * @author Marcus Boerger 15 * @version 1.0 16 * @since PHP 5.1 17 */ 18class EmptyIterator implements Iterator 19{ 20 /** No operation. 21 * @return void 22 */ 23 function rewind() 24 { 25 // nothing to do 26 } 27 28 /** @return \c false 29 */ 30 function valid() 31 { 32 return false; 33 } 34 35 /** This function must not be called. It throws an exception upon access. 36 * @throw Exception 37 * @return void 38 */ 39 function current() 40 { 41 throw new Exception('Accessing the value of an EmptyIterator'); 42 } 43 44 /** This function must not be called. It throws an exception upon access. 45 * @throw Exception 46 * @return void 47 */ 48 function key() 49 { 50 throw new Exception('Accessing the key of an EmptyIterator'); 51 } 52 53 /** No operation. 54 * @return void 55 */ 56 function next() 57 { 58 // nothing to do 59 } 60} 61 62?> 63
