sodium-0.5.0.2: examples/tests/memory-test-6.hs

{-# LANGUAGE DoRec #-}
-- | Make sure this program runs without leaking memory
import FRP.Sodium
import Control.Applicative
import Control.Exception
import Control.Monad

verbose = False

flam :: Event () -> Reactive (Behavior Bool)
flam e = do
    rec
        let eToggle = snapshotWith (\() selected -> not selected) e selected
        selected <- hold False eToggle
    return selected

main = do
    (e, push) <- sync newEvent
    out <- sync $ do
        eInit <- flam e
        eFlam <- hold eInit (execute ((const $ flam e) <$> e))
        switch eFlam
    kill <- sync $ listen (values out) $ \x ->
        if verbose then print x else (evaluate x >> return ())
    forever $ sync $ push ()
    kill