CP-style Task wrapper · beginners

I'm curious if the CP-style Task wrapper outlined at https://youtu.be/7SidSvJcPd0?t=2064 ever got implemented? Was there a reason that got dropped in favor of the current approach? Just trying to learn some of the internals and the design decisions behind them.

Richard Feldman (Feb 29 2024 at 01:15):

we're still working on implementing it!

Richard Feldman (Feb 29 2024 at 01:16):

it's being worked on as recently as earlier today :big_smile:

Nicolo Davis (Feb 29 2024 at 01:47):

Oh I see :)

Nicolo Davis (Feb 29 2024 at 01:57):

I was trying to use this pattern for a Haskell project I was working on and gave up after realizing that I would need to enumerate all the possible types for the continuations in the Operation type:

data Operation = Op1 (Int -> Operation) | Op2 (String -> Operation) | ...
type Effect a = (a -> Operation) -> Operation

(it didn't seem like there was an easy way to make Operation polymorphic in this case)

I'm guessing that Roc doesn't have this problem because all the operations are well defined and finite in number?

Richard Feldman (Feb 29 2024 at 02:20):

yeah exactly

Richard Feldman (Feb 29 2024 at 02:21):

the platform knows exactly which operations it supports!

Last updated: Jul 26 2025 at 12:14 UTC

Stream: beginners