On Wed, Aug 17, 2011 at 4:49 PM, Tom Schouten wrote:
> {-# LANGUAGE ExistentialQuantification #-}
>
> -- Dear Cafe, this one works.
> data Kl' s i o = Kl' (i -> s -> (s, o))
> iso' :: (i -> Kl' s () o) -> Kl' s i o
> iso' f = Kl' $ \i s -> (\(Kl' kl') -> kl' () s) (f i)
>
> -- Is there a way to m
Does there exist any sample code or other resources on writing a custom
SQL-to-Haskell datatype converter instance for use with HDBC that would be
accessible to someone just starting with Haskell? The reason I need this is
because of this problem (using PostgreSQL):
Prelude Database.HDBC.PostgreSQ
On Thu, Aug 18, 2011 at 23:32, David Banas wrote:
> Does this trigger recollection in anyone:
>
> dbanas@dbanas-eeepc:~/prj/haskell/AMIParse/trunk$ make
> ghc -dynamic -o ami_test -L. -lami ami_test.o
> ./libami.so: undefined reference to `__stginit_haskell98_MarshalArray_'
> ./libami.so: undefin
Hi all,
Does this trigger recollection in anyone:
dbanas@dbanas-eeepc:~/prj/haskell/AMIParse/trunk$ make
ghc -dynamic -o ami_test -L. -lami ami_test.o
./libami.so: undefined reference to `__stginit_haskell98_MarshalArray_'
./libami.so: undefined reference to `__stginit_haskell98_MarshalError_'
co
On Thu, Aug 18, 2011 at 14:01, C K Kashyap wrote:
> *Main> let re = listToSequence [ hello, oneOrMore world, hello ]
> *Main> re
> hello(world)+hello
>
> I am looking for suggestions on how I could encode the anchors - ^ and $
> and also how I could refer to captures. My goal is to be able to ext
This is a linking issue. It seems GHC 7 automatically feeds the
linker SimpleJSON.o so when you explicitly provide it too then you get
those conflicts. All you need to do is call:
> ghc -o simple Main.hs
Unless you're using GHC 6, then the original command is correct:
> ghc -o simple Main.hs S
On Wed, Aug 17, 2011 at 10:37 AM, Paul Reiners wrote:
> I'm trying to do the following from Chapter 5 of "Real World Haskell":
>
> Our choice of naming for the source file and function is deliberate. To
> create an executable, ghc expects a module named Main that contains a
> function named main.
Dear Haskell folks,
I was attempting to do an EDSL that would allow me to describe regular
expressions in Hakell and generate Perl as target -
https://github.com/ckkashyap/LearningPrograms/blob/master/Haskell/edsl/regex.hs
$ ghci regex.hs
GHCi, version 7.0.3: http://www.haskell.org/ghc/ :? for
On 17 Aug, 2011,at 03:11 PM, Rogan Creswick wrote:encoding-0.6.6 uses it's own source during the build process! It
actually has to be partially compiled before the build tool can build
encoding (!). I'm *amazed* that this actually works at all
(impressed, too), This is by design. It is intended
Hi, I came up with the following extremely compact version of Gaussian
elimination for matrices represented as functions. I searched the web
but found nothing resembling it, probably because of its inefficiency.
Has anybody seen something like it before?
Thanks
Tobias
gauss :: Int -> (Int -> Int
On Thu, Aug 18, 2011 at 4:41 AM, Antoine Latter wrote:
> One problem to consider - a downstream user of the new features won't
> know that they need to pass special flags to your module, and may not
> even know that they are using your module if the dependency is a few
> steps removed.
The situat
On Thu, Aug 18, 2011 at 3:33 AM, Rogan Creswick wrote:
> I would like to conditionally expose a number of internal modules in a
> library depending on a cabal flag - the idea is that new features
> could be implemented externally to the library without contaminating
> the source with undesirable c
I would like to conditionally expose a number of internal modules in a
library depending on a cabal flag - the idea is that new features
could be implemented externally to the library without contaminating
the source with undesirable changes. However, I've been unable to
find a way to structure a
> Now, what we can do with kl1? We can feed it an integer, say 1, and
> obtain function f of the type s -> (s,Bool) for an _unknown_ type s.
> Informally, that type is different from any concrete type. We can
> never find the Bool result produced by that function since we can
> never have any concr
On 8/18/2011 6:49 AM, Antoine Latter wrote:
Hi Haskell,
I have a question about the Haskell FFI and creating FunPtrs to
Haskell functions.
Does anyone have any recommendations for when I have a top-level
function that I would like to pass to a C function as a function
pointer (that is called vi
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