I just can't see why the following code will not type check. I have
scaled it down as much as possible:
-
-- IO with an extra level annotation
newtype IO' t a = MkIO' (IO a)
-- levels
data H
data L
-- Explicitly recursive continuation type
data C t a = forall
describing. You can
ask Niklas Broberg about this.
Indeed, we have a working server that does runtime loading of HSP
pages (i.e. Haskell apps) using hs-plugins. We'll be releasing a first
version some time really soon, but if you want a preview just send me
a mail. =)
/Niklas
What I mean is that if one page wants to change directory using
setCurrentDirectory, this change affects all other (lightweight)
threads as well, which is not how ordinary system threads works.
AFAIK, this _is_ how ordinary system threads work.
Hmm, I guess was confused (and is still)
Hello fellow Haskelleers,
I've come upon a problem that sort of bites me.
I'm writing a multithreaded webserver in which pages are dynamically
loaded haskell applications. The main server loop listens for incoming
requests and distributes these to request handlers, each running in a
separate
Alastair Reid wrote:
3. Can I define my own exception types?
Sadly, no. There is only one 'exception type'.
You can use dynamics and encode new kinds of exceptions as Strings
but that isn't very satisfactory.
But not at all, allowing you to declare your own exception types is
*exactly* what
Could we possibly have derived instances of Typeable and Data for
Network.URI.URI in the 6.3 CVS please?
I second this request, and also ask for an instance of Typeable for
Control.Concurrent.MVar (and the other Control.Concurrent types as well).
/Niklas
We have released a new version of HaRP.
Major updates are:
* A revised syntax.
* Regular patterns are now non-greedy by default.
More information and downloads can be found at
http://www.dtek.chalmers.se/~d00nibro/harp/
/Niklas Broberg
Marco Righele wrote:
Ideally each session would work more or less as follows:
do(hdl,hn,pn) - accept socket
text - hGetContents hdl
inputs - parse text
replies - sequence $ map reply inputs
sequence $ map (hPrint hdl) replies
...
Where parse and reply are IO functions
I wrote:
Taking Lava, a hardware description language, as my example, I would
argue
that many users of Lava don't really care if it's embedded in Haskell or
whereever it comes from, they would just use it.
lavac Main.hs
where lavac is could simply be a script alias of
ghc
Dylan Thurston wrote:
So I guess that in
foo [/ a? 2 b /] = (a,b)
the type of a is '[Int]', not 'Maybe Int', right?
Aye. If you wanted Maybe Int, you would need to do
foo [/ [EMAIL PROTECTED] 2 b /] = (a,b)
I wrote:
I'm starting to think maybe our context dependent approach to implicit
bindings
case of regular patterns for it, for instance [s/ Hello
a* /] would be equal to [/ 'H' 'e' 'l' 'l' 'o' ' ' a* /], but this is not
yet implemented.
Any and all comments are welcome and appreciated,
Niklas Broberg, d00nibro[at]dtek.chalmers.se
Andreas Farre, d00farre[at]dtek.chalmers.se
Chalmers
What about
foo [/ (/ 2 (/ a _ /)* 3 /)* /] = a
? What is the type of a here? I think it should be [[Int]].
Not quite, the type of a will be [Int].
The only context dependency of variable types is the difference between
linear and non-linear contexts. In linear context, variables have the types
I wrote:
| Is there some simple way to make GHC treat our own base library in the
same
| magic way as the Prelude, so that it is always implicitly available?
[...]
Simon Peyton-Jones wrote:
A -fprelude-is flag would certainly be implementable. The questions are
a) Would it be desirable? After
to tell GHC what function must have what type with
a command line flag, but is there some other way?
Any leads are appreciated, even if they only lead into the source code of
GHC...
/Niklas Broberg
[1] Haskell Server Pages: http://www.dtek.chalmers.se/~d00nibro/hsp
I am currently co-developing a language[1] as an extension to Haskell,
by
means of a preprocessor to GHC. In this language we want to supply the
programmer with a number of functions by default, as with the functions
in
the GHC Prelude.
Is there some simple way to make GHC treat our own
scrutiny some time next week, we
just need to do some more alpha-testing first... Comment away!
regards,
Niklas Broberg, d00nibro[at]dtek.chalmers.se
Andreas Farre, d00farre[at]dtek.chalmers.se
Chalmers University of Technology
[1] Feel free to also visit the project that lead to this spin-off
/changed syntax?
Or even better, is there anyone out there who has already extended the
haskell-src bundle with support for any of them?
regards,
Niklas Broberg (d00nibro[at]dtek.chalmers.se)
_
Add photos to your e-mail with MSN 8. Get 2
it correctly right away... ;)
/Niklas Broberg, d00nibro[at]dtek.chalmers.se
_
The new MSN 8: advanced junk mail protection and 2 months FREE*
http://join.msn.com/?page=features/junkmail
___
Haskell
I am part of a project working on an implementation of an HSP system, very
much inspired by the paper you mention by Eric Meijer and Daan Leijen. It is
our goal to make a complete HSP system with a model for HTML in Haskell, a
pre-processor, and a runtime system/plugins for various web servers.
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