Hi,
Is is possible to get Network.Socket.ByteString.recv to be
non-blocking (i.e. return directly even if no data is available) ?
I have tried ti use
setSocketOption sock NoDelay 1
but then I get the following error:
setSocketOption: unsupported operation (Protocol not available)
Here is
This is indeed the case: if you want to apply your sumsqr function or
Ivan's (\ x y z -> z * y + z), to some Functor (Maybe in this case),
you don't have to redefine them, or even to use fmap2 or fmap3: you
just have to use <$> and <*>.
E.g.:
(\ a b c -> a + b + c) <$> Just 1 <*> Just 2 <*> Just
I think it works well :)
But sumsqr has type Int -> Int -> Int, not Int -> Int -> Int -> Int.
I.e. it does take only two arguments while fmap3 takes a function of
three arguments.
2010/8/26 michael rice
>
> OK, fmap2 works, but not fmap3. What am I not understanding?
>
> Michael
>
> import Cont
2010/8/26 michael rice
>
> From: http://en.wikibooks.org/wiki/Haskell/Applicative_Functors
>
> =
> import Control.Applicative
>
> f :: (a -> b -> c)
> fmap :: Functor f => (d -> e) -> f d -> f e
> fmap f :: Functor f => f a -> f (b -> c) -- Identify d with a, and e w
2010/8/23 Vo Minh Thu :
> Hi,
>
> I'd like to profile a GLUT application. After a run of the application
> with the +RTS -p flag, the .prof file is actually created but is
> always empty.
>
> Does someone have a clue of what's going on? Would it be related to
Hi,
I'd like to profile a GLUT application. After a run of the application
with the +RTS -p flag, the .prof file is actually created but is
always empty.
Does someone have a clue of what's going on? Would it be related to my
application calling GLUT's leaveMainLoop to exit?
Thanks,
Thu
_
2010/8/23 Eugene Kirpichov :
> [snip]
> Do there exist other nontrivial higher-order algorithms and datastructures?
> Is the field of higher-order algorithms indeed as unexplored as it seems?
> [snip]
Hi,
I'm thinking to some HOAS (higher order abstract syntax) representation.
Cheers,
Thu
_
2010/8/15 Ivan Lazar Miljenovic :
> Vo Minh Thu writes:
>
>> 2010/8/15 Ivan Lazar Miljenovic :
>>> Don Stewart writes:
>>>
>>>> * Pay attention to Haskell Cafe announcements
>>>> * Follow the Reddit Haskell news.
>>>>
2010/8/15 Ivan Lazar Miljenovic :
> Don Stewart writes:
>
>> * Pay attention to Haskell Cafe announcements
>> * Follow the Reddit Haskell news.
>> * Read the quarterly reports on Hackage
>> * Follow Planet Haskell
>
> And yet there are still many packages that fall under the radar
2010/8/4 Mark Lentczner :
> The Haddock team has spent the last few months revamping the look of the
> generated output. We're pretty close to done, but we'd like to get the
> community's input before we put it in the main release.
>
> Please take a look, and then give us your feedback through a
bindings for haskell:
> http://hackage.haskell.org/package/SDL
> SDL is better suited for 2D drawing (IMHO).
> http://www.libsdl.org/
>
>
> - Job
>
>
> On Thu, Jul 29, 2010 at 6:51 AM, Vo Minh Thu wrote:
>>
>> 2010/7/29 Eitan Goldshtrom :
>> > I'm having an
2010/7/29 Eitan Goldshtrom :
> I'm having an unusual problem with OpenGL. To be honest I probably shouldn't
> be using OpenGL for this, as I'm just doing 2D and only drawing Points, but
> I don't know about any other display packages, so I'm making due. If this is
> a problem because of OpenGL howe
2010/7/26 Vo Minh Thu :
> 2010/7/26 Daniel Fischer :
>> On Monday 26 July 2010 23:25:27, Max Rabkin wrote:
>>>
>>> It took me a fair while (I'm talking on the order of half a minute) to
>>> figure out what that meant, but it's pretty cool.
>>
>
2010/7/26 Daniel Fischer :
> On Monday 26 July 2010 23:25:27, Max Rabkin wrote:
>>
>> It took me a fair while (I'm talking on the order of half a minute) to
>> figure out what that meant, but it's pretty cool.
>
> Yeah, really neat.
>
>> Maybe a different
>> name would be better? How about (??) or
2010/7/26 Daniel Díaz :
> Hi all,
>
> I want to open a Haskell forum based on phpBB, but I need some collaborators
> for organize its content, and moderate its use. When we have finished, I
> will open this forum for the entire community of Haskell!
Hi,
The idea of a forum has been brought to thi
2010/7/26 Kevin Jardine :
> On Jul 26, 3:00 pm, Vo Minh Thu wrote:
>
>> Also, just like with IO, maybe restructuring the code to separate
>> monadic code would help.
>
> The specific monad I am dealing with carries state around inside it.
>
> I could revert to
2010/7/26 Kevin Jardine :
> As a Haskell neophyte, one of the things I find confusing is the way
> that the usual list functions (map, fold, ++, etc.) often cannot be
> used directly with monadic lists (m [a] or [m a]) but seem to require
> special purpose functions like ap, mapM etc.
Note that th
2010/7/25 Andrew Coppin :
> Patrick Browne wrote:
>>
>> Andrew,
>> Thanks for your detailed feedback, it is a great help.
>>
>
> Well, I like to be helpful.
>
>> I appreciate that the code does not do anything useful, nor is it an
>> appropriate way to write Haskell, but it does help me
>> understa
2010/7/23 Andrew Coppin :
> Don Stewart wrote:
>>
>> Download the Haskell Platform 2010.2.0.0:
>>
>> http://hackage.haskell.org.nyud.net/platform/
>>
>> (Caching server).
>>
>
> Anybody have any theroes why Trend Micro Antivirus is reporting this as a
> "confirmed fraud/attack site"?
See here:
2010/7/21 Ketil Malde :
> John Goerzen writes:
>
>> I need to read the LGPL and analyze it closer, but my first analysis
>> suggests that this would work fine for me and others.
>
> I'm using the LGPL for library code, and GPL for applications. Although
> a lot of noise is generated from the link
2010/7/19 Ivan Miljenovic :
> On 19 July 2010 14:31, Jonathan Geddes wrote:
>> Now when I'm working in a subdirectory, say Foo where the modules are
>> named Foo.Bar, Foo.Baz, Foo.etc., and I try to compile Bar.hs which
>> imports Foo.Baz, the compiler looks for the file Foo/Baz.hs. The
>> problem
2010/7/15 Alexey Karakulov :
> I wonder if pattern matching could be less verbose. Maybe this sounds weird,
> but here is example of what I mean:
>
>> type A = (Int, String)
>>
>> f :: String -> A -> A
>> f s (i,s') = (i, s ++ s')
>>
>> data B = B Int String deriving Show
>>
>>g :: String -> B -> B
2010/7/15 Vo Minh Thu :
> 2010/7/14 Vo Minh Thu :
>> 2010/7/14 Andrew Coppin :
>>> I'm trying to write a function that builds a series of results in a very
>>> complicated way. Eventually I ended up writing things like
>>>
>>>> newtype Dye =
2010/7/14 Vo Minh Thu :
> 2010/7/14 Andrew Coppin :
>> I'm trying to write a function that builds a series of results in a very
>> complicated way. Eventually I ended up writing things like
>>
>>> newtype Dye = Dye String deriving (Eq, Show)
>>>
>&
2010/7/14 Andrew Coppin :
> I'm trying to write a function that builds a series of results in a very
> complicated way. Eventually I ended up writing things like
>
>> newtype Dye = Dye String deriving (Eq, Show)
>>
>> instance Num Dye where
>> (Dye x) + (Dye y) = Dye (x ++ " + " ++ y)
>> (Dye x
2010/7/14 Felipe Lessa :
> On Wed, Jul 14, 2010 at 8:25 AM, Arnaud Bailly wrote:
>> Hello,
>> I would like to construct a collection of function-like objects on
>> which I could apply some value, in a typesafe and clean way.
>
> You could use Data.Typeable.cast [1]
>
> [1]
> http://haskell.org/gh
2010/7/13 Ivan Lazar Miljenovic :
> vadali writes:
>
>> hello,
>> iam really new to haskell,
>>
>> i want to define a function which takes as a parameter a list which can
>> contain other lists, eg. [1,[2,3],[4,[5,6]]]
>>
>> how would i define a function that can iterate through the items so (in t
2010/6/29 Roman Cheplyaka :
> * Stephen Tetley [2010-06-29 12:02:45+0100]
>> The "Applicative Programming with Effects Paper" has the "monodial
>> accumulating" applicative instance on a sum type Conor McBride and
>> Ross Paterson call Except:
>>
>> data Except err a = OK a | Failed err
>>
>> The
2010/6/28 José Romildo Malaquias :
> Is there in Haskell a non monadic function of type a -> a -> Bool which
> test for physical equality of two values? It would return True if only
> if both values are the same object in memory.
>
> For instance:
>
> value1 = "good"
> value2 = "good"
>
> eq val
2010/6/24 José Romildo Malaquias :
> On Tue, Jun 22, 2010 at 04:44:09PM +0200, Vo Minh Thu wrote:
>> 2010/6/22 José Romildo Malaquias :
>> > On Tue, Jun 22, 2010 at 02:54:08PM +0200, Vo Minh Thu wrote:
>> >> 2010/6/22 José Romildo Malaquias :
>> >> > H
2010/6/23 aditya siram :
> I haven't seen HWN in a while. If there is still community interest,
> how can we help you with this?
It will come back, see this thread:
http://www.reddit.com/r/haskell/comments/cdw38/hwn_it_will_be_back_promise/
Cheers,
Thu
2010/6/22 José Romildo Malaquias :
> On Tue, Jun 22, 2010 at 02:54:08PM +0200, Vo Minh Thu wrote:
>> 2010/6/22 José Romildo Malaquias :
>> > Hello.
>> >
>> > I have been teaching an introductory course on compiler construction to
>> > our undergrad
2010/6/22 José Romildo Malaquias :
> Hello.
>
> I have been teaching an introductory course on compiler construction to
> our undergraduates students using Appel's "Modern Compiler
> Implementation in Java". There are also versions of the book in ML and
> C. The books explain how to write a compile
2010/6/7 Benjamin L. Russell :
> Ozgur Akgun writes:
>
>> http://downforeveryoneorjustme.com/www.haskell.org-- Ozgur Akgun
>
> Same problem here since two days ago.
>
> Apparently, the server just went back up. Anybody know what kept the
> server down for so long?
http://www.reddit.com/r/haskell
2010/6/1 Brandon S. Allbery KF8NH :
> On May 31, 2010, at 19:13 , Don Stewart wrote:
>>
>> I see fairly regular complaints about too many Haskell libraries,
>> bewildering choice of difficult-to-determine quality.
>
> One thing that might help is just a less cluttered/better organized
> interface.
2010/5/28 Donn Cave :
> Quoth Ivan Lazar Miljenovic ,
>
>> Whilst the Either type isn't officially used for
>> errors, that is how it is usually treated in Haskell with the consensus
>> that Left = failure and Right = success (note that due to how its
>> defined it also has to be this way for Eit
2010/5/27 Ionut G. Stan :
> Hi,
>
> I was just wondering if there's any particular reason for which the two
> constructors of the Either data type are named Left and Right. I'm thinking
> that something like Success | Failure or Right | Wrong would have been a
> little better.
>
> I've recently see
2010/5/25 Ionut G. Stan :
> Hi, café
>
> I've begun learning Haskell for some time already, and although I don't
> really feel confident writing real world Haskell, I have a little idea that
> I want to materialize in Haskell code so I'm pretty eager to do something
> instead of just reading books
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