[rules-users] Can I reuse eval output?

[Arjun Dhar]

Hi,
 I've learned the use of eval() is not efficient, but it cannot be avoided in 
many cases.

However, using temporary variables I tried:

when
 $tmp: eval(...)
 ($tmp == false) or (eval(...))
Then
 ...
end


The above doers not compile; is there an alternative to reduce the number of 
evals by reusing their output?

Another question is, is tehre something wrong in the above definition from a 
declarative programming point of view?

Thanks,
Arjun