[rules-users] Matching on instanceof without eval?

I would like to match on the class of a field. I know I can use "eval(option instanceof OptionInstrument)", but my understanding is that the use of eval precludes indexing. What I want is something like the below, which does not work. Is some other mechanism other than putting type codes that are redundant with the class for this use case? thanks! ---- rule "Long Call/Put, Short Uncovered Call/Put" when position : Position(option : instrument, option.class == OptionInstrument.class) then ... end ---- -- View this message in context: http://www.nabble.com/Matching-on-instanceof-without-eval--tp17425953p174... Sent from the drools - user mailing list archive at Nabble.com.