* http://hackage.haskell.org/package/bindings-levmar-0.1
Which were the changes you needed to do to the library code? I
believe this is going to cause you two problems: maintenance (as
you can't always be sure the patched version didn't introduce a
bug) and license (as levmar is GPL. You
* Duncan Coutts duncan.cou...@worc.ox.ac.uk [2009-09-10 20:43:54+]
A personal favourite of mine is having the GUI event handler post data
over a channel to a thread. That thread reads from the channel and deals
with the events. The state of the GUI app is then held as local
parameters in
Hi,
Investigating memoization inspired by replies from this thread. I
encountered something strange in the behavior of ghci. Small chance it's a
bug, it probably is a feature, but I certainly don't understand it :)
The interpreter session went as follows
GHCi, version 6.10.4:
Hello staafmeister,
Friday, September 11, 2009, 4:57:01 PM, you wrote:
Here memo2 is a function that works like a combinator to obtain a memoized
recursive function. However the type of the function depends on how I define
it. In point-free style it gets the wrong
type, however if I define
Unfortunately, the instance of Monad for Either a is somewhat misguided in
Haskell.
There is a spurious restraint that the Left value in your Either be a member
of some Error class, which was brought about by the deletion of MonadZero
from Haskell 98 (as part of the elimination of failure free
Think I've found the solution my self. If I download the packages and
make a small change in the .cabal-file everything seems to work fine
again.
All i had to do was replace extra-libraries: GL with frameworks:
OpenGL. Not sure if this is the proper fix to make as I'm not any
good with cabal
Hi,
Given a datatype defined somewhere in a third-party package, without
deriving (Data) specified.
Is it possible, in my module which is importing that datatype from
that package, to auto-derive instance of Data for the said datatype?
The goal is not to recompile the package just because an
Hi Dimitry,
I think what you want is stand-alone deriving:
http://www.haskell.org/ghc/docs/latest/html/users_guide/deriving.html#stand-alone-deriving
Cheers,
Pedro
On Fri, Sep 11, 2009 at 16:29, Dimitry Golubovsky golubov...@gmail.comwrote:
Hi,
Given a datatype defined somewhere in a
Hi,
In my CHP library I need to do some exception catching. I want the
library to work on GHC 6.8 (with base-3 -- this is the current version
in Ubuntu Hardy and Jaunty, for example) and GHC 6.10 (which comes with
base-4). But base-3 and base-4 need different code for exception
catching
On Fri, Sep 11, 2009 at 11:26 AM, Neil Brown nc...@kent.ac.uk wrote:
Can anyone tell me how to fix this? I don't think that changing to always
use Control.Exception would fix this, because I need to give a different
type for catch in base-3 to base-4, so there's still the incompatibility to
Neil Brown wrote:
Can anyone tell me how to fix this? I don't think that changing to
always use Control.Exception would fix this, because I need to give a
different type for catch in base-3 to base-4, so there's still the
incompatibility to be dealt with.
The C library prints error messages to stderr. (...)
Attached is the patch to the C levmar library.
Thanks for the file.
The license issue is indeed a problem. Either your (linked +
distributed) code must be GPL or you must acquire a different
(commercial) license from the author of the C
Michael Mossey wrote:
Duncan Coutts wrote:
On Wed, 2009-09-09 at 18:29 -0700, Michael P Mossey wrote:
I'm trying to learn qtHaskell. I realize few people on this list
know anything about qtHaskell, but I have a question that probably
relates to all GUIs as implemented in Haskell. I just need
On Fri, Sep 11, 2009 at 6:10 AM, Edward Kmett ekm...@gmail.com wrote:
Unfortunately, the instance of Monad for Either a is somewhat misguided in
Haskell.
There is a spurious restraint that the Left value in your Either be a member
of some Error class, which was brought about by the deletion
Thanks to everyone who pointed me in the right direction on this problem, I
have been able to find a work around that allows me to push to an archive on a
network file share.
After some digging, I discovered the root of the problem. Briefly, Darcs uses
the standard library System.Directory
Hello Neil,
Friday, September 11, 2009, 7:26:47 PM, you wrote:
i suggest you to import extensible-exceptions package instead - it's
available even for ghc 6.8. alternatively, you may import
old-exceptions package (or something like this). trying to develop code
compatible with both versions of
On Fri, Sep 11, 2009 at 10:42 AM, David Menendezd...@zednenem.com wrote:
On Fri, Sep 11, 2009 at 11:26 AM, Neil Brown nc...@kent.ac.uk wrote:
Can anyone tell me how to fix this? I don't think that changing to always
use Control.Exception would fix this, because I need to give a different
Hi Fredrik,
Temaran wrote:
data Dar = Dar String String
deriving (Show, Eq)
class Bar a where
foo :: a - Int
instance Bar Dar where
foo(Dar n c) = length c
but it keeps generating the same error;
ERROR ./Bar.hs:16 - Inferred type is not general enough
*** Expression:
Hi Darrell,
This message definitely also belongs on the darcs-us...@darcs.net mailing
list. You can find information about how to subscribe here:
http://lists.osuosl.org/mailman/listinfo/darcs-users
Please join our list! I'm adding the list to the CC list in my reply.
On Fri, Sep 11, 2009 at
Hi folks,
I just installed GHC 6.10.4 on Ubuntu 9.04 32-bit, and then tried to install
the Haskell Platform from source. It built quite a bit of stuff, with many
warnings but no errors, and then finally died with the error below.
To install editline, I need cabal, which is of course why I
I mean editline, not readline.
On Fri, Sep 11, 2009 at 11:46 AM, Lyle Kopnicky li...@qseep.net wrote:
Hi folks,
I just installed GHC 6.10.4 on Ubuntu 9.04 32-bit, and then tried to
install the Haskell Platform from source. It built quite a bit of stuff,
with many warnings but no errors, and
On Fri, Sep 11, 2009 at 11:46 AM, Lyle Kopnicky li...@qseep.net wrote:
Hi folks,
I just installed GHC 6.10.4 on Ubuntu 9.04 32-bit, and then tried to install
the Haskell Platform from source. It built quite a bit of stuff, with many
warnings but no errors, and then finally died with the error
On Fri, Sep 11, 2009 at 12:01 PM, Judah Jacobson
judah.jacob...@gmail.comwrote:
The above editline requirement is for the editline C library, not the
Haskell bindings:
http://www.thrysoee.dk/editline
My guess is that you need to install a recent version of the
libedit-dev package.
After
OK, I was able to build the Haskell Platform on Ubuntu 9.04 with GHC 6.10.4.
But when I try to install it, I get an error:
Registering haskell-platform-2009.2.0.2...
Reading package info from dist/inplace-pkg-config ... done.
Writing new package config file... done.
lhs2TeX does not compile with the latest version of base. complaints
about Control.Exception abound
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Thanks, Jeff. I'm CC'ing Andres just in case he didn't get this.
Sean
On Fri, Sep 11, 2009 at 22:27, Jeff Heard jefferson.r.he...@gmail.comwrote:
lhs2TeX does not compile with the latest version of base. complaints
about Control.Exception abound
It's a bug in the install.sh script. Here's the fix:
36a37,42
# Is this exact version of the package already installed?
is_pkg_installed () {
PKG_VER=$1
grep ${PKG_VER} installed.packages /dev/null 21
}
40,43c46,53
cd ${pkg} || die The directory for the component ${PKG} is missing
Right. I know there was some argument a while back, but I thought
that position that instances are global period was pretty official.
At least it made sense to me. The more libraries you import the less
control you have over the extent of what they may import. But I guess
it wouldn't be
if I understand you correctly, all libraries that software I write depends
on, directly or indirectly, must be free of namespace conflicts. Is that
correct?
Well, it may be more accurate to say that class instances have no
namespaces, and are all implicitly global. When you import a module,
Hi,
yep - that's the problem I had.
run cabal with the -v (verbose option)
cabal install -v
so you can see exactly where it's failing
try the following :
--extra-lib-dirs=PATH
where PATH was (for me) was /sw/lib
I'm not sure but I may have had to use --extra-include-dirs also.
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