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Today's Topics:
1. Re: MonadThrow, MonadReader and shake (Sylvain Henry)
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Message: 1
Date: Tue, 18 Dec 2018 11:56:03 +0100
From: Sylvain Henry <sylv...@haskus.fr>
To: beginners@haskell.org
Subject: Re: [Haskell-beginners] MonadThrow, MonadReader and shake
Message-ID: <3b721fa7-cf7c-635e-ae79-0e4810c20...@haskus.fr>
Content-Type: text/plain; charset=utf-8; format=flowed
>> If you want `m ~ ReaderT Beamline m IO`, you can use something like:
>> `liftIO $ runReaderT stateBeforeCallingShake $ toRuchePath attachements`
>> (you need `stateBeforeCallingShake <- ask` before calling shake).
> ok, I will check this :).
I've swapped the args above, it should be:
liftIO $ runReaderT (toRuchePath attachements) stateBeforeCallingShake
> Does it mean that if an instance of the MonadReader was writtent for shake
> (Action). it should work out of the box ?
With additional `MonadThrow Action` and `MonadReader Beamline Action`
instances it should work. But the MonadReader one is really specific to
your use case.
Cheers,
Sylvain
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