On Fri, Nov 27, 2009 at 6:52 AM, miaubiz
would the way you implemented random in Unit.hs work here? an external variable whose name is the function that returns input.
Yes, but you have to be a little careful. If in the same rule you reference 'heading' multiple times, or create another instance using 'compare', it will still only call 'readCompare()' once during the execution of rule 'navigate'. It's not a problem if 'readCompass()' has no side-effects. But if it does, you probably won't get the results you expect.
compass :: Atom (E Int16) compass = int16' "readCompass()" >>= (return . value)
something <- int16' "something" period 1 $ atom "navigate" $ do heading <- compass something <== heading
br, miaubiz
Tom Hawkins-2 wrote:
The work around is to assign the result to an external variable. The drawback is the result will not be available until the rule executing the action has completed.
results <- bool' "result" -- Global, external variable to capture result. action (\ [a, b, c] -> printf "result = function(%s, %s %s)" a b c) [a, b, c]
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