On 22/07/12, Ertugrul Söylemez e...@ertes.de wrote:You are probably confusing the type class system with something fromOOP. A type class captures a pattern in the way a type is used. Thecorresponding concrete representation of that pattern is then written inthe instance definition: No really.
I don't know whether this is really applicable but: isn't emptyStack in
Ertugrul last message some kind of constructor? You can add any kind of
special constructors as functions in the type class which return a new
queue. For example:
class Stack s where
newEmptyStack :: s a
newSingletonStack
Am 22.07.2012 17:21, schrieb C K Kashyap:
I've updated the parser here -
https://github.com/ckkashyap/LearningPrograms/blob/master/Haskell/Parsing/xml_3.hs
The whole thing is less than 100 lines and it can handle comments as well.
This code is still not nice: Duplicate code in openTag and
Yes. I tried that, but due to my lack of Haskell expertise I cannot write the constructor insertC1 below:
class QUEUE_SPEC_CLASS1 q where
newC1 :: q a
isEmptyC1 :: q a - Bool
insertC1 :: q a - a - q a
sizeC1 :: q a - Int
restC1 :: q a - q a
-- I do not know how to specify
Thanks for your answer and your examples. It would be worthwile
collecting such examples in a small article.
I think some of the problems with type inference come from insufficient
theory about metavariables. When I started studying higher-order
unification I always wondered what the scope
Thank you so much Christian for your feedback ... I shall incorporate them.
Regards,
Kashyap
On Mon, Jul 23, 2012 at 3:17 PM, Christian Maeder
christian.mae...@dfki.dewrote:
Am 22.07.2012 17:21, schrieb C K Kashyap:
I've updated the parser here -
I think you are confusing ADTs, type classes and default declarations in
type classes. In Haskell, values are truly created only via abstract data
types. That would be a specific instance of your class:
data Stack a = Empty | Top a (Stack a)
Then you can write the implementation with respect to
Patrick,
-- Class with functional dependency
class QUEUE_SPEC_CLASS2 a q | q - a where
newC2 :: q a -- ??
sizeC2 :: q a - Int
restC2 :: q a - Maybe (q a)
insertC2 :: q a - a - q a
The above is a reasonable type class definition for what you seem to intend.
-- Without
Dominique,That is exactly the information that I required.Thank you very much,PatOn 23/07/12, Dominique Devriese dominique.devri...@cs.kuleuven.be wrote:Patrick, -- Class with functional dependency class QUEUE_SPEC_CLASS2 a q | q - a where newC2 :: q a -- ?? sizeC2 :: q a - Int restC2
Patrick Browne patrick.bro...@dit.ie wrote:
Thank you for your clear an detailed reply, the work on dependent
types seems to address my needs. However it is beyond my current
research question, which is quite narrow(see[1]). I merely wish to
identify the strengths and weakness of *current
On 07/21/2012 05:12 PM, C Gosch wrote:
Hi Cafe,
and then the server says
(AlertLevel_Fatal,UnexpectedMessage)
I'm not sure whether the ServerHelloDone should happen when resuming.
Does anyone have a hint what may be going wrong?
I am using TLS10 and the tls package with version 0.9.6.
Hi
Thank you Vincent and Dominique,
I saw the session callbacks before, and guessed that I needed to store
the SessionData for all SessionIDs and return them on resumption
(correct me if that's wrong).
However, I could not find a module that exports these two data types, so
I figured maybe that's
I just modified TLS locally on my system
to export SessionID and SessionData, and set the session callbacks to
storing/retrieving the session data from a Map.
After that, the resumption appears to work :-D
Thanks a lot for that hint!
Is that the way it's meant to be? If yes, how do I get the
data
Hi,
I am a happy user of Emacs with ghc-mod for Haskell programming. There is just
one issue I've run into: I have multiple versions of GHC installed on my
machine. Now, ghc-mod seems to use the GHC binary that was used to compile
ghc-mod itself, but that is not the version I want it to use for
On Mon, Jul 23, 2012 at 12:51:32PM -0500, Stephen Paul Weber wrote:
Currently you would have to do the upgrade manually, as `cabal-install
cabal-install` won't work (or alternatively edit your local
~/.cabl/packages/hackage.haskell.org/00-index.tar).
Pending a fix on hackage (hopefully)
On Monday, July 23, 2012, Simon Hengel wrote:
On Mon, Jul 23, 2012 at 12:51:32PM -0500, Stephen Paul Weber wrote:
Currently you would have to do the upgrade manually, as `cabal-install
cabal-install` won't work (or alternatively edit your local
On 07/23/2012 06:54 PM, . wrote:
I just modified TLS locally on my system
to export SessionID and SessionData, and set the session callbacks to
storing/retrieving the session data from a Map.
After that, the resumption appears to work :-D
Thanks a lot for that hint!
Is that the way it's meant to
Nice, thanks!!
Christian
Am 23.07.2012 um 22:28 schrieb Vincent Hanquez t...@snarc.org:
On 07/23/2012 06:54 PM, . wrote:
I just modified TLS locally on my system
to export SessionID and SessionData, and set the session callbacks to
storing/retrieving the session data from a Map.
After
On 24 July 2012 04:06, Peter Simons sim...@cryp.to wrote:
Hi,
I am a happy user of Emacs with ghc-mod for Haskell programming. There is just
one issue I've run into: I have multiple versions of GHC installed on my
machine. Now, ghc-mod seems to use the GHC binary that was used to compile
On Mon, Jul 23, 2012 at 2:06 PM, Peter Simons sim...@cryp.to wrote:
I am a happy user of Emacs with ghc-mod for Haskell programming. There is
just
one issue I've run into: I have multiple versions of GHC installed on my
machine. Now, ghc-mod seems to use the GHC binary that was used to
Hi,
I wonder why a foldr does not have a space leak effect?
Any hints? Thanks.
Qi
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On 24 July 2012 12:37, Qi Qi qiqi...@gmail.com wrote:
Hi,
I wonder why a foldr does not have a space leak effect?
Any hints? Thanks.
Why should it?
Does it not depend on the function you're folding, the type of
Foldl has the space leak effect, and that's why foldl' has been
recommended.
On Monday, July 23, 2012 9:44:59 PM UTC-5, Ivan Lazar Miljenovic wrote:
(Trying again using the real mailing list address rather than google
groups)
On 24 July 2012 12:37, Qi Qi qiqi...@gmail.com wrote:
Hi,
On 24 July 2012 12:52, Qi Qi qiqi...@gmail.com wrote:
Foldl has the space leak effect, and that's why foldl' has been recommended.
foldl can have a space leak due to accumulation of thunks:
foldl f a [b,c,d] = f (f (f a b) c) d
^^ Building up a chain of functions. As such, these thunks are
This question actually was risen when I read a relevant part in the RWH
book.
Now it's much clearer to me. Thanks Ivan!
On Monday, July 23, 2012 10:04:00 PM UTC-5, Ivan Lazar Miljenovic wrote:
On 24 July 2012 12:52, Qi Qi qiqi...@gmail.com wrote:
Foldl has the space leak effect, and that's
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