Hi,
for the first question you can look at combinators in
Data.Iteratee.ListLikehttp://hackage.haskell.org/packages/archive/iteratee/0.8.5.0/doc/html/Data-Iteratee-ListLike.html
for iteratee package or
Hi all,
I'm practising my Haskell by writing a simple TCP echo server and finding
that getting my program control to be succinct is rather tricky. In
particular, I have return () everywhere, my error handling is verbose and
I'm not entirely sure my recursion is the cleanest way syntactically to
On 28 June 2011 18:08, John Ky newho...@gmail.com wrote:
Hi all,
I'm practising my Haskell by writing a simple TCP echo server and finding
that getting my program control to be succinct is rather tricky. In
particular, I have return () everywhere, my error handling is verbose and
I'm not
On 20/06/11 15:45, Richard Senington wrote:
Hi all,
I have recently become interested in Dataflow programming and how it
related to functional languages.
I am wondering if the community has any advice on reading matter or
other directions to look at.
So far I have been looking through the
Ivan Lazar Miljenovic wrote:
I don't think you need all those return () everywhere... And at the
end, why do you do line - getLine when you don't use the result?
The hlint program would have flagged both of those and possibly
others. See:
http://community.haskell.org/~ndm/hlint/
Erik
--
Sævar Berg s.b.saevars...@gmail.com wrote:
The first question is, I think, to be solved with enumeratees but I can't
really grok how.
Let's say I have an iteratee that consumes all input. Is it possible to
implement an enumeratee or something else to stick between the enumerator
and the
I have an 'impossible' happened error.
The code may look a little bit convoluted but it is part of my real code.:
- begin of code--
{-# LANGUAGE FlexibleInstances, UndecidableInstances
, MultiParamTypeClasses
#-}
class Serializable a b
class
Hi Eric, Ivan,
On 28 June 2011 18:32, Erik de Castro Lopo mle...@mega-nerd.com wrote:
The hlint program would have flagged both of those and possibly
others. See:
Cool!
It didn't flag either for me, but it recommended replacing ++ (show
port)with ++
show port, if then else with unless,
There is the void function in Control.Monad:
http://hackage.haskell.org/packages/archive/base/latest/doc/html/Control-Monad.html#v:void
Instead of using return () you can just use void processLine.
Also some people like to use the either function instead of matching on
Left/Right. In this case
Thanks Jonas,
I feel much better already:
import Control.Concurrent
import Control.Exception
import Control.Monad
import Network
import System.IO
import System.IO.Error (isEOFError)
main = withSocketsDo $ do
sListen - listenOn (PortNumber 8000)
putStrLn Listening on Port 8000
forkIO $
On 26/06/2011 09:31, Paterson, Ross wrote:
If this is the case, then multiple sentences in the 2010 report don't
make sense, though the way in which they don't make sense sort of
depends on what simple pattern binding means.
Indeed, the Report has two problems:
Sections 4.4.3.2 and 4.5.5 have
If I've understood it correctly, concurrent is similar to functions
discussed here:
http://www.haskell.org/pipermail/haskell-cafe/2011-April/091474.html
and here
http://www.haskell.org/pipermail/haskell-cafe/2011-January/088319.html
2011/6/28 Ertugrul Soeylemez e...@ertes.de
Sævar Berg
Hi all,
It seems I'm not allowed to open same file both for writing and for reading:
Prelude System.IO f_out - openFile mylog.log AppendMode
Prelude System.IO f_in - openFile mylog.log ReadMode
*** Exception: mylog.log: openFile: resource busy (file is locked)
Usage scenario:
I use hslogger
On Mon, Jun 27, 2011 at 10:33 AM, John Velman vel...@cox.net wrote:
I'm running OS X 10.6.7, XCode 3.2.5. When I try to install The Haskell
Platform 2011.2.0.1 for Mac OS X 10.6 (Snow Leopard) it goes all the way
through to running package scripts, then says installation failed
I did two
On Tue, Jun 28, 2011 at 3:43 AM, Alberto G. Corona agocor...@gmail.com wrote:
I have an 'impossible' happened error.
The code may look a little bit convoluted but it is part of my real code.:
I don't know why it's crashing, but did you already report it as a
bug? If not, you definitely should.
On 28 June 2011 17:50, Gracjan Polak gracjanpo...@gmail.com wrote:
It seems I'm not allowed to open same file both for writing and for reading:
This behaviour is part of the Haskell 98 specification (section
21.2.3, http://www.haskell.org/onlinereport/io.html):
Implementations should enforce
Reported:
http://hackage.haskell.org/trac/ghc/ticket/5287
2011/6/28 Alberto G. Corona agocor...@gmail.com
2011/6/28 Jason Dagit dag...@gmail.com
On Tue, Jun 28, 2011 at 3:43 AM, Alberto G. Corona agocor...@gmail.com
wrote:
I have an 'impossible' happened error.
The code may look a
On Mon, Jun 27, 2011 at 7:21 PM, Sævar Berg s.b.saevars...@gmail.comwrote:
The first question is, I think, to be solved with enumeratees but I can't
really grok how.
Let's say I have an iteratee that consumes all input. Is it possible to
implement an enumeratee or something else to stick
Max Bolingbroke batterseapower at hotmail.com writes:
This behaviour is part of the Haskell 98 specification (section
21.2.3, http://www.haskell.org/onlinereport/io.html):
Thanks for the explanation. Such sharing behavior should be mentioned in
documentation:
On Tue, Jun 28, 2011 at 13:56, Gracjan Polak gracjanpo...@gmail.com wrote:
What was the rationale behind such strict non-sharing policy?
The obvious rationale is that it helps maintain the illusion of
referential integrity within the process. (Outside is a lost cause,
but operations on
On 6/28/11, Jason Dagit dag...@gmail.com wrote:
I'd try asking on StackOverflow. I think the people who know the
answer might be watching there instead of here.
Really? I had thought that everyone who was on SO was on here also.
Tom
___
On Tue, Jun 28, 2011 at 11:14 AM, Tom Murphy amin...@gmail.com wrote:
On 6/28/11, Jason Dagit dag...@gmail.com wrote:
I'd try asking on StackOverflow. I think the people who know the
answer might be watching there instead of here.
Really? I had thought that everyone who was on SO was on
Dear Cafe,
I have recently run into a very annoying issue that I was not able to get
around. I have a local package that makes use of the snappy compression
library, which boasts bindings to C++ through a C wrapper.
Everything compiles fine with ghc --make, but cabal install hits a wall when
On 28 June 2011 18:56, Gracjan Polak gracjanpo...@gmail.com wrote:
Anyway, where do I find an 'openFileShared' function? Packages unix/Win32 do
not
have obvious leads...
Perhaps the functions in System.Posix.IO do what you want?
Hi everyone,
I have a task that involves parsing a flat-file into a vector from the
Data.Vector package. In the interest of keeping things simple, I first used
Attoparsec.Text's version of many and then converted the resulting list to
a vector:
import qualified Data.Vector as V
import
Hi all,
From the IterIO tutorial:
enumFile' is like enumFile above, but type restricted to data in the
lazy ByteString
format, which is more efficient than plain Strings. (enumFile supports
multiple types, but in this example there is not enough information for
Haskell to choose one of them, so
So this is definitely a GHC bug, but I think the problem is probably
triggered by this line:
instance Serializable a b = IResource a
I don't think this is a valid instance declaration without a functional
dependency on Serializable, as it's impossible to know which type 'b' to use
in the
On Tue, Jun 28, 2011 at 6:20 PM, Eric Rasmussen ericrasmus...@gmail.com wrote:
It runs quickly, but I naively thought I could outperform it by reworking
many to build a vector directly, instead of having to build a list first
and then convert it to a vector:
manyVec :: Alternative f = f a - f
At Wed, 29 Jun 2011 10:11:26 +1000,
John Ky wrote:
[1 multipart/alternative (7bit)]
[1.1 text/plain; ISO-8859-1 (7bit)]
Hi all,
From the IterIO tutorial:
enumFile' is like enumFile above, but type restricted to data in the lazy
ByteString format, which is more efficient
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