DDC compiler and effects;
better than Haskell? (was Re: [Haskell-cafe] unsafeDestructiveAssign?)
John A. De Goes
john at n-brain.net
Wed Aug 12 21:27:30 EDT 2009
So what, because effect systems might not eliminate *all* boilerplate,
you'd rather use boilerplate 100% of the time? :-)
John A. De Goes
The Evolution of Collaboration
http://www.n-brain.net | 877-376-2724 x 101
On Aug 12, 2009, at 3:28 PM, Dan Doel wrote:
> On Wednesday 12 August 2009 10:12:14 am John A. De Goes wrote:
>> I think the point is that a functional language with a built-
>> in effect system that captures the nature of effects is pretty damn
>> cool and eliminates a lot of boilerplate.
> It's definitely an interesting direction (possibly even the right
> one in the
> long run), but it's not without its faults currently (unless things
> changed since I looked at it).
> For instance: what effects does disciple support? Mutation and IO?
> What if I
> want non-determinism, or continuations, etc.? How do I as a user add
> effects to the effect system, and specify how they should interact
> with the
> other effects? As far as I know, there aren't yet any provisions for
> this, so
> presumably you'll end up with effect system for effects supported by
> compiler, and monads for effects you're writing yourself.
> By contrast, monad transformers (for one) let you do the above
> defining of new
> effects, and specifying how they interact (although they're
> certainly neither
> perfect, nor completely satisfying theoretically).
> Someone will probably eventually create (or already has, and I don't
> about it) an extensible effect system that would put this objection
> to rest.
> Until then, you're dealing in trade offs.
> -- Dan
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