Comments (5)
This makes perfect sense to me, I'd be happy to update TH
module. Do you have a name for the command in mind? Or would it be better to pass options to makeFree
?
from free.
It's probably best not to change makeFree
for backwards compatibility.
The issue with template haskell functions that take options is that in order to use them you have to apply them to their arguments in a separate module because of the stage restriction, so I wouldn't go down that route unless absolutely necessary. I'd be happy with just makeFree_
or makeFreeNoTypes
.
from free.
I think there might be one more nice command. We can introduce makeFreeCon
for single constructors and prepend Haddock documentation to makeFreeCon
invocation like this:
data LangF x
= Input (String -> x)
| Output String x
| Halt
deriving (Functor)
-- | Get string.
makeFreeCon 'Input
-- | Put string.
makeFreeCon 'Output
-- | Abort computation.
makeFreeCon 'Halt
This way one does not need to write down type signatures (which I find long and boring).
makeFree_
(and, perhaps, makeFreeCon_
) would still make sense when one would like to comment individual arguments like this:
makeFreeCon_ 'Output
-- | Output.
output :: MonadFree LangF m =>
String -- ^ String to output.
-> m () -- ^ No result.
from free.
Yeah, I like that, too
from free.
Merged
from free.
Related Issues (20)
- Missing free 5 migration guide HOT 2
- Metadata revisions for 4.8 and 4.8.0.1 HOT 2
- free-5 doesn't build on old GHCs with transformers-0.4 HOT 3
- Fails with GHC-7.8.4 and installed transformers HOT 9
- Failure building free 5.0.2 with GHC 8.4.2 cross to iOS
- 'Ap' from 'Control.Applicative.Free' conflicts with 'Ap' in base-4.12
- ComonadTraced instance for CofreeT
- Add a MonadBaseControl instance for CofreeT HOT 6
- Simplify the applicative instance of Free HOT 2
- Deriving Via for several datatypes HOT 1
- Comonad f => MonadFree f (Tagged f) HOT 1
- Nu-based distributive cofree
- Add a class for free monad transformer-type things.
- Document 'Control.Monad.Free.Ap' has to work only on "commutative" monads
- Why does hoistFree have such a strict type? HOT 2
- deriving (Applicative, Monad) via GenericFreeMonad "Pure" (Free f)
- Support transformers-0.6 HOT 3
- Further simplify instances to avoid overkill *1 classes
- Dangling Links HOT 2
- `hoistFree` should be named `transFree`
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