On Sun, 2005-04-24 at 23:16 -0700, Michael Vanier wrote:
I've been trying to generate an infinite list of random coin flips in GHC
6.4, and I've come across some strange behavior:
--
import System.Random
data Coin = H | T
On Wed, 2005-03-16 at 11:55 +, Ross Paterson wrote:
On Wed, Mar 16, 2005 at 03:54:19AM +, Ian Lynagh wrote:
Do you have a list of functions which behave differently in the new
release to how they did in the previous release?
(I'm not interested in changes that will affect only
On Wed, 2005-03-16 at 13:09 +, Duncan Coutts wrote:
On Wed, 2005-03-16 at 11:55 +, Ross Paterson wrote:
It doesn't affect functions added by the hierarchical libraries, i.e.
those functions are safe only with the ASCII subset. (There is a vague
plan to make Foreign.C.String
In message [EMAIL PROTECTED] =?ISO-8859-1?Q?Maur=EDcio?=
[EMAIL PROTECTED] writes:
Hi,
I've seen some options for GUI programming in Haskell libraries page,
but what I really would like is to define my user interface using HTML
(or, maybe, SVG). What are the options to do that in
On Tue, 2005-03-01 at 11:15 -0300, Maurício wrote:
If there are no pre-built packages of gtk2hs for your system you can still
build
from source in a reasonably straigtforward way. Basically we provide
pre-built
versions of the problematic files that take so much memory to create in an
On Wed, 2005-02-23 at 03:25 +, David Owen wrote:
Hi all,
I'm looking for a Haskell GUI library which supports the display of rendered
Html pages in the same way that web browsers do.
I've been getting to grips recently with wxHaskell as it was recommended on
haskell-cafe. I was
On Tue, 2005-01-25 at 19:12 +, Ben Rudiak-Gould wrote:
My concern here is that someone will actually use the library once it
ships, with the following consequences:
1. Programs using the library will have predictable (exploitable)
bugs in pathname handling.
2. It will never
On Fri, 2005-01-21 at 07:25 +, Adrian Hey wrote:
On Thursday 20 Jan 2005 7:35 pm, Dmitri Pissarenko wrote:
In my program, I need ONLY to read an image and to transform it into such
matrix.
Which graphics library can you recommend, if no other image manipulation
operations are
On Fri, 2005-01-21 at 12:33 +, Keean Schupke wrote:
Glynn Clements wrote:
The central issue is that the Unix API doesn't distinguish between
cases 1 and 2 when it comes to non-blocking I/O, asynchronous I/O,
select/poll etc. [OTOH, NT overlapped I/O and certain Unix extensions
do
On Fri, 2005-01-21 at 16:26 +, Keean Schupke wrote:
Udo Stenzel wrote:
Thus the question is, does select() reliably tell if read() would block or
does it
check for something else? Is the documentation wrong (on some platforms)?
Having read around I have found that select does
On Wed, 2005-01-19 at 15:06 +, Keean Schupke wrote:
Why not use a thread-pool, and a safe call to read, provided there is
an OS thread available,
defaulting to unsafe if no thread is available... You could make the
thread pool size an argument...
If it's just a question of speed then
On Tue, 2005-01-18 at 22:52 +, Glynn Clements wrote:
Ben Rudiak-Gould wrote:
Essentially, reading data from regular files is always deemed to occur
soon, so the usual mechanisms for dealing with slow I/O (i.e.
pipes, FIFOs, character devices, sockets) don't work. This applies
equally to
On Mon, 2005-01-17 at 13:44 -0800, Ben Rudiak-Gould wrote:
John Meacham wrote:
Actually, If I were writing new haskell libraries, I would use mmap
whenever I could for accessing files. not only does it make the file
pointer problem go away, but it can be drastically more efficient.
I'm
On Mon, 2005-01-17 at 16:27 -0800, Ben Rudiak-Gould wrote:
Marcin 'Qrczak' Kowalczyk wrote:
Convenience. I'm worried that it uses separate types for various
kinds of streams: files, pipes, arrays (private memory), and sockets.
Haskell is statically typed and lacks subsumption. This means
On Wed, 2005-01-12 at 11:34 +, Jules Bean wrote:
On 12 Jan 2005, at 11:10, Matthew Roberts wrote:
All this is of course entirely dependent on having a suitable GUI
library or set of bindings for haskell. I haven't tried wxHaskell yet
so I can't comment there. (And for some applications,
On Tue, 2005-01-11 at 21:05 +0100, Dmitri Pissarenko wrote:
Hello!
I want to learn to create GUIs with Haskell.
Which GUI frameworks can you recommend?
wxHaskell is good for building portable GUIs. It has an extensive
selection of widgets and has a good API.
gtk2hs is good for building
In message [EMAIL PROTECTED] Matthew Roberts
[EMAIL PROTECTED] writes:
I know this question is probably going over old ground - so I apologise
in advance.
However, I want to know if there has been any practical standardisation
in the GUI area. Last time I looked at this it seemed some
On Mon, 2004-12-13 at 14:56 -0500, S. Alexander Jacobson wrote:
Hmm cool. Binary does not appear in the GHC
docs... Is it new?
Ah, it's not a user library distributed with GHC, it's a library used
internally in the implementation of GHC. If you want to use it you have
to rip it out of the ghc
In message [EMAIL PROTECTED] Radu Grigore
[EMAIL PROTECTED] writes:
Hi,
I try to install ghc on 6.2 on a gentoo linux distribution (from
sources). It fails with
You are most welcome to report Haskell issues on Gentoo in the Gentoo bugzilla:
http://bugs.gentoo.org/
We're fairly good at
On Thu, 2004-12-09 at 11:04 -0500, S. Alexander Jacobson wrote:
Or is there a better way to (de-)serialize
FiniteMaps?
There's a neat trick that we use in c2hs (at least the patched version
shipped with gtk2hs) to strictly read all the keys of the finite map but
read all the values lazily. This
On Wed, 2004-12-08 at 07:58 -0700, [EMAIL PROTECTED] wrote:
I've got a general new person type question.
I understand that I can hide a function in a module that I am importing
if it conflicts with another identical function name.
But if the situation arises that I would like to use two
On Wed, 2004-12-08 at 17:04 +0100, Henning Thielemann wrote:
On Wed, 8 Dec 2004, Duncan Coutts wrote:
There are actually several options here, you can import modules only
qualified, then every value from that module needs to be qualified. Some
modules are designed to be used this way, see
On Fri, 2004-11-05 at 13:57, Henning Thielemann wrote:
On Fri, 5 Nov 2004, Robert Dockins wrote:
What IEEE has done is shoehorned in some values that aren't really
numbers into their representation (NaN certainly; one could make a
convincing argument that +Inf and -Inf aren't numbers).
In message [EMAIL PROTECTED] John Goerzen
[EMAIL PROTECTED] writes:
OK, recently I posed a question about rethinking some OO idioms, and
that spawned some useful discussion.
I now have a followup question.
One of the best features of OO programming is that of inheritance. It
can be used
On Fri, 2004-08-06 at 14:05, MR K P SCHUPKE wrote:
You should include the definitions of the classes before saying
HOrderedList l' just has to prove by induction that for any element
in the list, the next element is greater, so the class is simply:
class HOrderedList l
instance HNil
On Fri, 2004-08-06 at 15:44, Malcolm Wallace wrote:
Hmm...doesn't
--8--
module Closed(foo) where
class C a where foo = ...
instance C ...
--8--
module Main where
import Closed
...foo...
--8--
do what you want? You can only use
On Mon, 2004-07-26 at 10:58, MR K P SCHUPKE wrote:
In the absence of such a standard, the best that can be done is to
abstract vectorisation by word size and number of words, and supply
a software implementation of all vector ops to use if the hardware
does not support certain primitives.
On Thu, 2004-07-01 at 12:34, MR K P SCHUPKE wrote:
Oh... also when using unboxed arrays you may well have
to have a separate array for each colour plane (r,g,b,a)
as I think unboxed arrays can only contain primitive types - although
I am not certain about this - it may be enough to have the
On Thu, 2004-07-01 at 17:01, Crypt Master wrote:
I consider myself a pretty good imperative programmer, been at it for
decades, and am tryibng my hand at Haskell now. Unfrituantly I am not
getting it all that quickly despite having the multimedia haskell book.
[snip]
The take operator
On Wed, 2004-06-30 at 12:00, MR K P SCHUPKE wrote:
Ahh.. I see whats happening:
MArray (STUArray s) a (ST s) = String - String - ST s (UArray (Int,Int) a)
IArray UArray a = String - String - a
nothing here is specifying a... you cannot leave a polymorphic in this case.
You need to
On Wed, 2004-06-30 at 12:54, Duncan Coutts wrote:
To restate the question for Haskell-Cafe readers:
Is it possible to return an arbitrary unboxed array that was
constructed in the ST monad (as an STUArray)?
The issue is that you end up with a MArray class
On Tue, 2004-06-22 at 20:52, Adrian Hey wrote:
On Tuesday 22 Jun 2004 6:20 pm, MR K P SCHUPKE wrote:
ahh but in this example:
f :: [Int] - [Bool]
f (i:is) = even i : f is
f [EMAIL PROTECTED] = e
e is an empty list of Ints not an empty list of Bools!
If the difference is
On Tue, 2004-05-18 at 17:48, scott west wrote:
Hello all,
I've recently attempted to get the gtk+hs bindings operational, with
evidently no success. They both compile fine, but when trying to make
all the examples in the gtk+hs tree, it gives up with:
Does anyone have any possible ways
On Sat, 2004-05-15 at 16:08, Per Larsson wrote:
When I compile my haskell program (on a linux machine) with GHC and send it to
a colleague he can't run it because he has a somewhat older version of libc.
Is there a GHC switch that I have missed that enables you to statically link
the parts
Something which wasn't mentioned but is quite useful is type-specialised
xml parsers. Some tools manipulate xml generically, giving you back some
DOM tree which is great if you are writing a general purpose xml parser.
However most uses know exactly what DTD/Schema/Type they are dealing
with and
On Wed, 2004-03-24 at 18:00, Alex Gontcharov wrote:
I don't want to hide it within the function, I need the functions
to have file scope.
Oh, ok. I assumed from the indentation (you see layout matters!) that it
was a nested function.
Haskell (like Python) is layout sensitive, the indentation
On Wed, 2004-03-24 at 15:51, Simon Marlow wrote:
I am new to haskell and would look to write a function equivalent
to the following loop in C
int value = 50;
int part_stack[4];
int *part_ptr = part_stack;
for (; value; value /= 1)
*part_ptr++ = value % 1;
On Sun, 2004-01-04 at 10:20, Graham Klyne wrote:
Which leads to a question: I've been thinking that the white box tests
may be better served by test expressions coded *within* the module
concerned. In many cases, I create these, then en-comment them when the
code is working. I would
On Sat, 21 Jun 2003 17:34:59 +0100
Glynn Clements [EMAIL PROTECTED] wrote:
I do not see why the location of data should have an
influence here.
Haskell values are private to the program, while file contents may be
read and written by other processes.
Haskell computations can be
On Fri, 13 Jun 2003 19:39:53 +0200
Christian Buschmann [EMAIL PROTECTED] wrote:
I tried to implement a simple counter with gtk2hs. To increase my
counter I defined following event:
onClicked btn $ do si - textBufferGetStartIter tb
ei - textBufferGetEndIter tb
On Sun, 2 Mar 2003 10:16:12 +0200
Cagdas Ozgenc [EMAIL PROTECTED] wrote:
Greetings,
1) How does one model out of memory condition in Haskell, perhaps using a Maybe
type?
Unfortuntely not since it would not be referentially transparent. It's
part of a more general issue of exceptions in
On Thu, 19 Sep 2002 22:06:59 +0200
Nick Name [EMAIL PROTECTED] wrote:
In general, how does one implement a function like getChanContents
wich returns an infinite list? Tell me just some pointer to information
of course, I don't want an entire functional programming lesson :)
See
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