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Remove strict compose versions - #745
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Once this is merged, I think it would be good to make a release in time for GHC 9.0, so users of |
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Do you know the deadline?
…On Thu, Sep 10, 2020, 5:34 AM Simon Jakobi ***@***.***> wrote:
Once this is merged, I think it would be good to make a release in time
for GHC 9.0, so users of compose are less likely to encounter the
differences in strictness.
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Unfortunately I don't. https://gitlab.haskell.org/ghc/ghc/-/issues/18216#note_298165 seems to indicate that the release preparations are ongoing. @bgamari When would a |
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Do we have enough |
No idea. I was wondering how to best convert a lazy map to a strict one by forcing all the values. Is there anything better than |
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Let's not discuss this in a closed PR though. |
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`map id` is the best way I know.
…On Fri, Sep 11, 2020, 5:50 PM Simon Jakobi ***@***.***> wrote:
Let's not discuss this in a closed PR though.
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Actually, that's wrong.... The nf package has the right stuff for doing it
efficiently. Or a strictifying fold.
…On Fri, Sep 11, 2020, 6:05 PM David Feuer ***@***.***> wrote:
`map id` is the best way I know.
On Fri, Sep 11, 2020, 5:50 PM Simon Jakobi ***@***.***>
wrote:
> Let's not discuss this in a closed PR though.
>
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What does that look like in practice? Could you give an example? |
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forceValues :: Map k v -> ()
forceValues = foldl' (flip seq) ()
Looks like I was wrong about nf. I thought it had a type like this:
newtype Shallow a = Shallow a
instance NFData (Shallow a) where
rnf !_ = ()
With that,
forceValues = rnf . L.map Shallow
where L.map Shallow should be rewritten to a coercion.
…On Fri, Sep 11, 2020, 6:10 PM Simon Jakobi ***@***.***> wrote:
Actually, that's wrong.... The nf package has the right stuff for doing it
efficiently. Or a strictifying fold.
What does that look like in practice? Could you give an example?
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So a Cheers! |
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Yes, but fusing that definition ... not so easy! Maybe we should actually
offer that toStrict function so we can attach RULES to it.
…On Fri, Sep 11, 2020, 6:41 PM Simon Jakobi ***@***.***> wrote:
So a toStrict function could be defined as
toStrict :: Map k v -> Map k v
toStrict m = foldl' (flip seq) () m `seq` m
Cheers!
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2 participants
…as discussed in
haskell-unordered-containers/unordered-containers#299 (comment).