I am just a junior of Haskell, I just copy Michael Chavinda's android
project and rewrite existing software. Due to non disclosure agreement, I
can't have my own git account. I think google group is the right place I
could contribute some code back to Frege. Because my supervisor can not
trace my activity on google because of Chinese GFW
在 2017年11月24日星期五 UTC+8下午3:01:21，Dierk Koenig写道：
>
> Would be cool to add it to the stdlib.
> Care about a PR? Best add a sample as well.
>
> Cheers
> Dierk
>
> sent from:mobile
>
> Am 24.11.2017 um 02:33 schrieb zhou...@163.com <javascript:>:
>
> ContT is more pragmatic than Cont，with this powerful abstraction, I could
> effectively abstract away callbacks and listener in Android. My next
> exploration is to port coroutineT to Frege
>
> module examples.MyCont where
>
> class MonadIO m where
> --- Lift a computation from the 'IO' monad.
> liftIO :: IO a -> m a
>
> class MonadTrans t where
> --- Lift a computation from the argument monad to the constructed monad.
> lift :: Monad m => m a -> t m a
>
> instance MonadIO IO where
> liftIO io = io
>
> instance MonadTrans (ContT r) where
> lift m = ContT (m >>=)
>
> instance (Monad m, MonadIO m) => MonadIO (ContT r m) where
> liftIO = lift . liftIO
>
> data ContT r m a = ContT { runContT :: (a -> m r) -> m r }
>
> instance Monad (ContT r m) where
> pure x = contT ($ x)
> m >>= k = contT $ \c -> runContT m (\x -> runContT (k x) c)
>
> contT :: ((a -> m r) -> m r) -> ContT r m a
> contT f = ContT { runContT = f }
>
> runContT :: ContT r m a -> ((a -> m r) -> m r)
> runContT c = ContT.runContT c
>
> callCC :: ((a -> ContT r m b) -> ContT r m a) -> ContT r m a
> callCC f = ContT $ \c -> ContT.runContT (f (\a -> ContT $ \_ -> c a)) c
>
> data Data = native java.util.Date where
> native new :: () -> IO (MutableIO Data)
> native toString :: Mutable s Data -> ST s String
>
> current :: IO String
> current = do
> d <- Data.new ()
> d.toString
>
> fun :: Int -> IO String
> fun = (`runContT` id) $ do
> callCC $ \exit1 -> do
> exit1 $ liftIO current
>
>
>
>
>
> --
> You received this message because you are subscribed to the Google Groups
> "Frege Programming Language" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to frege-programming-language+unsubscr...@googlegroups.com
> <javascript:>.
> For more options, visit https://groups.google.com/d/optout.
>
>
--
You received this message because you are subscribed to the Google Groups
"Frege Programming Language" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to frege-programming-language+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
