Hello,
I want to model an I/O read/write buffer in Haskell and marshall down
into ANSI C.
1) ByteString? Or Ptr Word8?
2) What are example values of the types in 1)?
Kind regards, Vasili
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Hi,
Are there mature libraries for IMAP and NNTP
available to Haskell?
Thanks,
Maurício
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After some fiddling with this style, here is what I came up with
for the 8 queens problem in the 99 problem set. It's quite entertaining ...
( note: it's brute force and requires a combination library )
queens2 n = n.permutations.filter all_satisfied where
all_satisfied queens = queens.diff_col
On Sat, 2008-06-21 at 22:48 -0400, Brent Yorgey wrote:
> On Sat, Jun 21, 2008 at 09:36:06PM -0500, Derek Elkins wrote:
> > On Sat, 2008-06-21 at 21:11 -0400, Brent Yorgey wrote:
> > > On Fri, Jun 20, 2008 at 09:52:36PM -0500, Derek Elkins wrote:
> > > > On Fri, 2008-06-20 at 22:31 -0400, Brent Yorg
On Sat, Jun 21, 2008 at 09:36:06PM -0500, Derek Elkins wrote:
> On Sat, 2008-06-21 at 21:11 -0400, Brent Yorgey wrote:
> > On Fri, Jun 20, 2008 at 09:52:36PM -0500, Derek Elkins wrote:
> > > On Fri, 2008-06-20 at 22:31 -0400, Brent Yorgey wrote:
> > > > On Fri, Jun 20, 2008 at 06:15:20PM -0500, Geo
On Sat, 2008-06-21 at 21:11 -0400, Brent Yorgey wrote:
> On Fri, Jun 20, 2008 at 09:52:36PM -0500, Derek Elkins wrote:
> > On Fri, 2008-06-20 at 22:31 -0400, Brent Yorgey wrote:
> > > On Fri, Jun 20, 2008 at 06:15:20PM -0500, George Kangas wrote:
> > > >
> > > > foldright (+) [1, 2, 3] 0 == ( (1 +
On Sat, Jun 21, 2008 at 7:11 PM, Brent Yorgey <[EMAIL PROTECTED]> wrote:
> First, given finite sets A (representing an 'alphabet') and S
> (representing 'states'), we can describe a finite state machine by a
> function phi : A x S -> S, which gives 'transition rules' giving a new
> state for each c
On Fri, Jun 20, 2008 at 09:52:36PM -0500, Derek Elkins wrote:
> On Fri, 2008-06-20 at 22:31 -0400, Brent Yorgey wrote:
> > On Fri, Jun 20, 2008 at 06:15:20PM -0500, George Kangas wrote:
> > >
> > > foldright (+) [1, 2, 3] 0 == ( (1 +).(2 +).(3 +).id ) 0
> > > foldleft (+) [1, 2, 3] 0 == ( id.(3 +)
On Saturday 21 June 2008, Don Stewart wrote:
> maybeRead :: Read a => String -> Maybe a
> maybeRead s = case reads s of
> [(x, "")] -> Just x
> _ -> Nothing
Note, if you want to match the behavior of read, you'll probably want
something like:
maybeRead
Lanny Ripple wrote:
> I had luck with this the other day using Database.HDBC.ODBC. For
> Ubuntu's Hardy I found that Oracle's 10.2.0.3 worked best.
> (10.2.0.4 and 11 seemed to have problems for me at least.)
>
> http://www.oracle.com/technology/software/tech/oci/instantclient/htdocs/linuxsoft.ht
Don Stewart <[EMAIL PROTECTED]> writes:
> The main thing is to define a safe read. This will be in the base
> library soon,
>
> maybeRead :: Read a => String -> Maybe a
> maybeRead s = case reads s of
> [(x, "")] -> Just x
> _ -> Nothing
>
> Then you can pat
Don Stewart wrote:
Interesting.
Does it depend on an unreleased version of the process library?
Indeed it does. Actually most of the code was written using the current released
version, I just jumped the gun a bit when I saw how nice the new interface was.
I'm hoping that the release of the
On Sat, Jun 21, 2008 at 1:28 PM, Ryan Ingram <[EMAIL PROTECTED]> wrote:
> You just have the arguments to "poke" wrong:
> poke :: Storable a => Ptr a -> a -> IO ()
>
> So you are missing the pointer argument
> poke p Signal = poke p signal_int_value
xj2106:
> Hi,
>
> I'm wondering how usually you parse command line arguments
> list safely. If the given argument is wrong, the program
> can still print out some error information instead of giving
> something like
>
> Prelude.read: no parse
>
> Let's make the discussion concrete. Suppose we
Hi
> I'm wondering how usually you parse command line arguments
> list safely. If the given argument is wrong, the program
> can still print out some error information instead of giving
> something like
Either use reads instead, and deal with the case where there is no
parse. Or use the safe
Hi,
I'm wondering how usually you parse command line arguments
list safely. If the given argument is wrong, the program
can still print out some error information instead of giving
something like
Prelude.read: no parse
Let's make the discussion concrete. Suppose we have the
following code.
--
matti.niemenmaa+news:
> Greetings,
>
> I hereby announce the release of the Pipe library, a library for piping
> data through a pipeline of processes.
>
> A web page with (hopefully) all the necessary info and a simple example can
> be found at http://iki.fi/matti.niemenmaa/pipe/
>
> The packa
You just have the arguments to "poke" wrong:
poke :: Storable a => Ptr a -> a -> IO ()
So you are missing the pointer argument
poke p Signal = poke p signal_int_value
I didn't know about the (#const) syntax. Interesting.
Also, alignment of signal should match the alignment of the underlyi
Hello Haskell community!
I just did a marginally cool thing and I wanted to share it
with you.
"rst-literals" is a small program I wrote a while ago in
order to write documents in reStructuredText format that
would embed SQL code for data models in them, a form of
literal programming for SQL if
On Fri, Jun 20, 2008 at 07:57:58AM +0200, Ketil Malde wrote:
> "Albert Y. C. Lai" <[EMAIL PROTECTED]> writes:
>
> >> While we are kind of on this topic, what makes the characters ħ þ
> >> prefix operator by default, while º and most other odd ones infix?
>
> > alphanumeric vs non-alphanumeric
>
Greetings,
I hereby announce the release of the Pipe library, a library for piping data
through a pipeline of processes.
A web page with (hopefully) all the necessary info and a simple example can be
found at http://iki.fi/matti.niemenmaa/pipe/
The package is at Hackage:
http://hackage.has
Hi Jared,
2008/6/21 <[EMAIL PROTECTED]>:
> Guess.hs:19:12: parse error on input `doGuessing'
>
> Failed, modules loaded: none. "
That says there's something wrong at line 19. In this case,
'doGuessing' is not properly aligned with 'putStrLn' of the previous
line. The same happens at line 22.
Hello,
On pdf page 43 of YAHT it provides a code example. I typed this into a file
named "Guess.hs" and tried unsuccessfully to load it into ghci. I am running
ghci version 6.8.2 This is the output it gave me:
" [1 of 1] Compiling Main ( Guess.hs, interpreted )
Guess.hs:19:12: parse error on inp
Oracle OCI interface is quite different between 7/8 and 9/10. And 10
is different from 9 in some respect. I don't know much about 11.
Oracle 10.2.0.3 is a stable release, but there are some major server
bugs in it, that Oracle had to release 10.2.0.4. I'd recommend Haskell
community to focus on 10.
2008/6/20 Alistair Bayley <[EMAIL PROTECTED]>:
> Having just taken a closer took at what Oracle Instant Client is, I
> suspect that you might have some trouble getting Takusen to compile
> against it. The Instant Client lacks header files, while Takusen's FFI
> imports specify oci.h. I don't know w
George Moschovitis wrote:
Alternatively is there a way to create a UTCTime value from an epoch
integer (no of seconds since epoch).
I can't find a suitable constructor with Hoogle.
http://www.haskell.org/ghc/docs/latest/html/libraries/time/Data-Time-Clock-POSIX.html
posixSecondsToUTCTime
pro
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