Re: [Haskell-cafe] Re: DDC compiler and effects; better than Haskell?

2009-08-16 Thread Marcin Kosiba
On Sunday 16 August 2009, Artem V. Andreev wrote: John A. De Goes j...@n-brain.net writes: On Aug 15, 2009, at 6:36 AM, Jason Dusek wrote: 2009/08/14 John A. De Goes j...@n-brain.net: Hmmm, my point (perhaps I wasn't clear), is that different effects have different commutability

Re: [Haskell-cafe] Re: DDC compiler and effects; better than Haskell?

2009-08-16 Thread John A. De Goes
I forgot about links. In that case, consider: getUniqueFilesInDirRecursive. Attacking irrelevant details in an argument is often called a strawman attack. Such attacks are pointless because they do not address the real substance of the issue. My example is easily modified to avoid the

Re: [Haskell-cafe] Re: DDC compiler and effects; better than Haskell?

2009-08-16 Thread John A. De Goes
I chose this example specifically because parsing/compiling is not IO- bound. Many build systems today achieve multi-core scaling by parallelizing all the phases: parsing, semantic analysis, and compilation. Your question is a good one and one we face already in auto- parallelization of

Re: [Haskell-cafe] Re: DDC compiler and effects; better than Haskell?

2009-08-16 Thread Artem V. Andreev
John A. De Goes j...@n-brain.net writes: I forgot about links. In that case, consider: getUniqueFilesInDirRecursive. Attacking irrelevant details in an argument is often called a strawman attack. Such attacks are pointless because they do not address the real substance of the issue. My

Re: [Haskell-cafe] Re: DDC compiler and effects; better than Haskell?

2009-08-14 Thread Henning Thielemann
On Thu, 13 Aug 2009, Heinrich Apfelmus wrote: Russell O'Connor wrote: Peter Verswyvelen wrote: I kind of agree with the DDC authors here; in Haskell as soon as a function has a side effect, and you want to pass that function to a pure higher order function, you're stuck, you need to pick

Re: [Haskell-cafe] Re: DDC compiler and effects; better than Haskell?

2009-08-13 Thread Peter Verswyvelen
Well, in DDC I believe the order is left to right. But you guys are right, many orders exist. On the other hand, a language might offer primitives to convert pure-to-effectfull functions no, in which you indicate the order you want. e.g. preOrder map No? (anyway Oleg's reply seems to give a

Re: [Haskell-cafe] Re: DDC compiler and effects; better than Haskell?

2009-08-13 Thread Ben Lippmeier
Heinrich Apfelmus wrote: Actually you need five versions: The pure version, the pre-order traversal, the post-order traversal, the in-order traversal, and the reverse in-order traversal. And that is just looking at syntax. If you care about your semantics you could potentially have more (or

RE: [Haskell-cafe] Re: DDC compiler and effects; better than Haskell?

2009-08-13 Thread Sittampalam, Ganesh
What would preOrder foldr/foldl mean? What about preOrder (reverse . map) and preOrder (map . reverse) ? Another option would be for map to take a strategy as a parameter, sort of like Control.Parallel.Strategies. Peter Verswyvelen wrote: Well, in DDC I believe the order is left to right.

Re: [Haskell-cafe] Re: DDC compiler and effects; better than Haskell?

2009-08-13 Thread roconnor
On Thu, 13 Aug 2009, rocon...@theorem.ca wrote: Actually you need five versions: The pure version, the pre-order traversal, the post-order traversal, the in-order traversal, and the reverse in-order traversal. And that is just looking at syntax. If you care about your semantics you could

Re: [Haskell-cafe] RE: DDC compiler and effects;better than Haskell?

2009-08-12 Thread Peter Verswyvelen
Yes, but HaRe *is* extremely clever :-) I just wish I could use it, but since it doesn't support many GHC extensions, I haven't. On Wed, Aug 12, 2009 at 11:26 AM, Bayley, Alistairalistair.bay...@invesco.com wrote: From: haskell-cafe-boun...@haskell.org [mailto:haskell-cafe-boun...@haskell.org]