mutable records

[Jorge Adriano]

> Hi,
> thx for this reply.
> Is there any overhead using this mutable?

I just thought I should point out that "Mutable" is not an haskell type.
You can see in the Utils module that it is just a type synonim for IORef:
http://icfpcontest.cse.ogi.edu/simulator/pfe.cgi?Utils#Mutable
http://haskell.cs.yale.edu/ghc/docs/latest/html/base/Data.STRef.html
I think that sometimes STRef might be a better choice...


> Are you also using Templates ?
> With this mutable I can adapt a lot of software from Ocamel.

I think this John Hughes paper "Global Variables in Haskell" might be use=
full=20
to you: http://www.math.chalmers.se/~rjmh/Globals.ps


> But the gnawing question remains: Shall it be possible to be almost as
> efficient (in native code) as Ocamel's code, I refer here to Doug Bagle=
y's
> comparison of programming languages. Remarkably the fibonacci numbers t=
est
> scores almost as well. But the code is not the same. Comparable code wo=
uld
> have been to use the same code of Ocamel, to be more specific: how
> efficiently is recusivity implemented in Haskell. I cannot compare this=
 on
> my Windows XP since I need MSVC6.0 on this machine which I don't have. =
On
> the other hand I have cygwin installed now. Unfortunately I can't make
> makefiles. Probably on the web I can find an explanation. In this way I=
 can
> recompile Ocamel with Cygwin and compare the results a bit.
> There are also 5(?) failures of Haskell programms . Is there a flaw in
> these programms?
> P.S. does anyone know a good Haskell  IDE for Windows XP?

I don't really use windows but I know there is support for the windows ve=
rsion=20
of JCreator: http://www.students.cs.uu.nl/people/rjchaaft/JCreator/

You can always use Xemacs :)
http://www.xemacs.org/Download/win32/
http://www.haskell.org/haskell-mode/

J.A.