    -- | Waiting (for replies).
    module Sound.Osc.Wait where

    -- * Wait

    -- | Repeat action until predicate /f/ is 'True' when applied to result.
    untilPredicate :: Monad m => (a -> Bool) -> m a -> m a
    untilPredicate :: forall (m :: * -> *) a. Monad m => (a -> Bool) -> m a -> m a
    untilPredicate a -> Bool
    f m a
    act =
        let g :: a -> m a
    g a
    p = if a -> Bool
    f a
    p then m a
    recur else a -> m a
    forall a. a -> m a
    forall (m :: * -> *) a. Monad m => a -> m a
    return a
    p
            recur :: m a
    recur = m a
    act m a -> (a -> m a) -> m a
    forall a b. m a -> (a -> m b) -> m b
    forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
    >>= a -> m a
    g
        in m a
    recur

    -- | Repeat action until /f/ does not give 'Nothing' when applied to result.
    untilMaybe :: Monad m => (a -> Maybe b) -> m a -> m b
    untilMaybe :: forall (m :: * -> *) a b. Monad m => (a -> Maybe b) -> m a -> m b
    untilMaybe a -> Maybe b
    f m a
    act =
        let g :: a -> m b
    g a
    p = m b -> (b -> m b) -> Maybe b -> m b
    forall b a. b -> (a -> b) -> Maybe a -> b
    maybe m b
    recur b -> m b
    forall a. a -> m a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (a -> Maybe b
    f a
    p)
            recur :: m b
    recur = m a
    act m a -> (a -> m b) -> m b
    forall a b. m a -> (a -> m b) -> m b
    forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
    >>= a -> m b
    g
        in m b
    recur