On Fri, Nov 27, 2009 at 6:52 AM, miaubiz <[email protected]> wrote: > > 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] >> > > -- > View this message in context: > http://old.nabble.com/Atom---help.-tp24010994p26535883.html > Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com. > > _______________________________________________ > Haskell-Cafe mailing list > [email protected] > http://www.haskell.org/mailman/listinfo/haskell-cafe > _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
