[JASS] Passing a boolexpr?

I have a function where I register a trigger event. I want to pass the filter to that function from somewhere else.

function register takes code filter returns nothing
    local conditionfunc fltr = Condition(filter)
    call TriggerRegisterEnterRegion(trg, rgn, fltr)
    call DestroyCondition(fltr)
    set fltr = null

call register(code filterFunc)

I was wondering if there a better way to do this so i don't have to use a local variable in the function?
Thanks =)
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