Source for file Float.class.php

<?php
 
/**
 * @since 7/14/05
 * @package harmoni.primitives.numbers
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: Float.class.php,v 1.6 2007/09/04 20:25:28 adamfranco Exp $
 */ 
 
require_once(dirname(__FILE__)."/Number.class.php");
 
/**
 * A simple Float data type.
 *
 * @package harmoni.primitives.numbers
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: Float.class.php,v 1.6 2007/09/04 20:25:28 adamfranco Exp $
 */
class Float 
    extends Number
{
    
/*******************************************************
 * Class Methods - Instance Creation
 *********************************************************/
 
 
    /**
     * Answer a new object with the value specified
     * 
     * @param mixed $value 
     * @param optional string $class The class to instantiate. Do NOT use outside
     *         of this package.
     * @return object Float 
     * @access public
     * @since 7/14/05
     */
    function withValue ( $value, $class = 'Float') {
        return parent::withValue($value, $class);
    }
 
    /**
     * Answer a new object with the value specified
     * 
     * @param string $string a string representation of the object
     * @return object Double 
     * @access public
     * @since 3/14/06
     */
    function fromString ($string, $class = 'Float') {
        return parent::fromString($string, $class);
    }
 
    
    /**
     * Answer a new object with the value zero
     * 
     * @param optional string $class The class to instantiate. Do NOT use outside
     *         of this package.
     * @return object Float 
     * @access public
     * @since 7/14/05
     */
    function zero ( $class = 'Float') {
        return parent::zero($class);
    }
        
/*******************************************************
 * Instance Methods - Arithmatic
 *********************************************************/
 
    
    /**
     * Answer the sum of the receiver and aNumber.
     * 
     * @param object Number $aNumber 
     * @return object Number 
     * @access public
     * @since 7/14/05
     */
    function plus ( $aNumber ) {
        $class = get_class($this);
        eval('$obj = '.$class.'::withValue($this->value() + $aNumber->value());');
        return $obj;
    }
    
    /**
     * Answer the result of multiplying the receiver and aNumber.
     * 
     * @param object Number $aNumber 
     * @return object Number 
     * @access public
     * @since 7/14/05
     */
    function multipliedBy ( $aNumber ) {
        $class = get_class($this);
        eval('$obj = '.$class.'::withValue($this->value() * $aNumber->value());');
        return $obj;
    }
    
    /**
     * Answer the result of dividing the receiver and aNumber.
     * 
     * @param object Number $aNumber 
     * @return object Number 
     * @access public
     * @since 7/14/05
     */
    function dividedBy ( $aNumber ) {
        $class = get_class($this);
        eval('$obj = '.$class.'::withValue($this->value() / $aNumber->value());');
        return $obj;
    }
    
/*******************************************************
 * Instance Methods - Private
 *********************************************************/
 
    
    /**
     * Set the internal value to a PHP primitive.
     * 
     * @param mixed $value 
     * @return void 
     * @access private
     * @since 7/14/05
     */
    function _setValue ( $value ) {
        $this->_value = floatval($value);
    }
}