Re: [rules-dev] [accumulate] sum is always a double? What if it's only an int?

Geoffrey, The "sum" function that is shipped with drools always uses double internally, but all numeric accumulate functions must have return type Number to avoid class cast exceptions... I must write that in the docs... so, recommendation is to do: Number( $total : intValue ) from accumulate( Hop($distance : distance ), // distance is an int sum($distance) ); Now, having said that, the decision to use double is because we needed a one size fits all to ship with drools. On the other hand I tried to make as simple as possible to plug new or replace built-in functions. So, if you want a sum function that uses only integers, you can easily develop and plug it your own. Since I just wrote the docs on how to do it, may I ask you please to read them and provide a feedback if they are good, need more info, shall I write them in another way, etc? BTW, when I say it is really simple to create another sum function, I mean, you can do it in about 20 minutes. Really! Find attached the HTML doc page I'm talking about. []s Edson 2007/7/22, Geoffrey De Smet < ge0ffrey.spam(a)gmail.com&gt;: -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com