On Wed, 2005-07-20 at 17:06 +0100, Andy Gimblett wrote:
> A small stylistic question: what's the "best" way to build strings
> containing other values? For example, I have:
>
> data Process = Stop |
>Prefix String Process |
>External Process Process
>
> instance S
On 20-Jul-2005, David Barton <[EMAIL PROTECTED]> wrote:
> I can contribute some experience from commercial standardization efforts.
> ANSI, IEEE, and ISO standards require re-ballotting every five years,
> otherwise the standards lapse. Reballotting may or may not be accompanied
> by changes in
On 20 July 2005 18:49, John Goerzen wrote:
> On 2005-07-20, Simon Marlow <[EMAIL PROTECTED]> wrote:
>> This paper might help shed some light:
>>
>> http://www.haskell.org/~simonmar/papers/conc-ffi.pdf
>
> Forgot to reply to this. *Very helpful* link, I had always wondered
> what the bound thre
John Goerzen writes:
There was a brief discussion on #haskell today about the Haskell
standard. I'd like to get opinions from more people, and ask if there
is any effort being done in this direction presently.
I know that some people would like to hold off on such a process until
their fav
There was a brief discussion on #haskell today about the Haskell
standard. I'd like to get opinions from more people, and ask if there
is any effort being done in this direction presently.
I think an updated standard is overdue. I find it difficult anymore to
write any but the most trivial of pr
On 2005-07-20, Simon Marlow <[EMAIL PROTECTED]> wrote:
> This paper might help shed some light:
>
> http://www.haskell.org/~simonmar/papers/conc-ffi.pdf
Forgot to reply to this. *Very helpful* link, I had always wondered
what the bound thread functions in Control.Concurrent were for :-)
So let
On Wed, Jul 20, 2005 at 07:00:22PM +0200, Lemmih wrote:
> On 7/20/05, Andy Gimblett <[EMAIL PROTECTED]> wrote:
> >
> > Is there a facility like this in Haskell? Or something else I should
> > be using, other than lots of ++ ?
>
> There's Text.Printf:
>
> Prelude Text.Printf> printf "(%s [] %s)"
On 2005-07-20, Simon Marlow <[EMAIL PROTECTED]> wrote:
> You could forkIO the main loop if you want; it shouldn't make any
> difference, except that GHC terminates the program when the main thread
> completes, so it's more convenient to have the main loop run in the main
> thread, so that the progr
On 7/20/05, Andy Gimblett <[EMAIL PROTECTED]> wrote:
> A small stylistic question: what's the "best" way to build strings
> containing other values? For example, I have:
>
> data Process = Stop |
>Prefix String Process |
>External Process Process
>
> instance Show
Hello there,
> I'm very fond of Python's interpolation approach, where we'd have
> something like the following for the External case:
>
> def __str__(self):
> return "(%s [] %s)" % (self.p, self.q)
are you familiar with C's printf procedure? It's where that kind of notation
comes fr
How about this?
instance Show Process where
show Stop = "Stop"
show (Prefix l p) = concat ["(", l, "->", show p, ")"]
show (External p q) = concat ["(", show p, " [] ", show q, ")"]
Hope that helps,
Bryn
Andy Gimblett wrote:
A small stylistic question: what's the "best" way to buil
On Wednesday 20 July 2005 08:27, Sun Yi Ming wrote:
> Hello,
> I have two txt file,and i want to mix the two files line by line,
> [...]
> import System.IO
>
> mix :: [a] -> [a] -> [a]
> mix [] ys = ys
> mix xs [] = xs
> mix (x:xs) (y:ys) = [x,y] ++ mix xs ys
>
> f1 = do contents1 <- readFile "ur
On Wed, 20 Jul 2005, Jake Luck wrote:
> > I need to parse a file in this format:
> > float float float
> > float float float
> > Each row has 3-columns of floating procision number divided by white
> > space. The number of lines is undefined. I use (lines (readFile "..."))
> > to read the fil
I need to parse a file in this format:
float float float
float float float
Each row has 3-columns of floating procision number divided by white
space. The number of lines is undefined. I use (lines (readFile "..."))
to read the file.
Text.ParserCombinators.Parsec sounds perfect, no?
_
A small stylistic question: what's the "best" way to build strings
containing other values? For example, I have:
data Process = Stop |
Prefix String Process |
External Process Process
instance Show Process where
show Stop = "Stop"
show (Prefix l p) = "(" ++
On 20 July 2005 16:23, John Goerzen wrote:
> On Wed, Jul 20, 2005 at 04:10:38PM +0100, Simon Marlow wrote:
>> On 20 July 2005 14:35, John Goerzen wrote:
>>> These systems generally have some sort of an opaque main loop,
>>> implemented in C. This loop would usually never return, or perhaps
>>> on
On Wed, Jul 20, 2005 at 04:10:38PM +0100, Simon Marlow wrote:
> On 20 July 2005 14:35, John Goerzen wrote:
> > These systems generally have some sort of an opaque main loop,
> > implemented in C. This loop would usually never return, or perhaps
> > only return once the UI is destroyed.
>
> Is the
On 20 July 2005 14:35, John Goerzen wrote:
> I'm looking at packaging an event-driven console widget set (CDK) for
> Haskell using FFI. I know that other event-driven widget sets have
> Haskell bindings, but I'm not quite sure how to make everything play
> nice with forkIO.
>
> These systems gen
Hello Alberto,
Tuesday, July 19, 2005, 5:11:27 PM, you wrote:
AR> Hello Bulat, thanks a lot for your message, the RULES pragma is just what we
AR> need!
AR> However, in some initial experiments I have observed some strange behavior.
AR> For instance, in the following program:
1) there is no guar
Hello yin,
Wednesday, July 20, 2005, 1:18:25 AM, you wrote:
y> data SomeData =
y> SomeData {
y> int1 :: Int,
y> int2 :: Int
y> }
y> class SomeClass where
y>infix 1 `i_`
y>i_ :: SomeData -> Int -> SomeData
y>infix 1 `_i`
y
> From: John Goerzen [mailto:[EMAIL PROTECTED]
>
> How would I make this sort of system play nice with Haskell threads?
>
> Also, the brief FFI docs that I've found don't really explain
> callbacks
> in FFI very well to me. Are there any other resources on
> this anywhere?
This might help:
Hi,
I'm looking at packaging an event-driven console widget set (CDK) for
Haskell using FFI. I know that other event-driven widget sets have
Haskell bindings, but I'm not quite sure how to make everything play
nice with forkIO.
These systems generally have some sort of an opaque main loop,
imple
On Wed, 20 Jul 2005, yin wrote:
> Bernard Pope wrote:
>
> >On Wed, 2005-07-20 at 11:43 +0200, yin wrote:
> >
> >>
> >>how do I convert an Word32 (or WordXYZ) to Int, or Integer, or Float,
> >>...? The Int conversion is the priority.
> >>
> >>
> >fromIntegral to convert to an instance of Integral,
Hi,
I need to parse a file in this format:
float float float
float float float
Each row has 3-columns of floating procision number divided by white
space. The number of lines is undefined. I use (lines (readFile "..."))
to read the file.
Thnks.
Matej 'Yin' Gagyi
On 18 July 2005 15:19, Bayley, Alistair wrote:
> Not a taker (yet - where can I find information about non-lazy
> implementation of non-strict languages? From Google so far:
> speculative evaluation (Eager Haskell), call-by-name vs call-by-need.)
>
> Wikipedia frustratingly hints that "other eval
On 7/20/05, Sven Panne <[EMAIL PROTECTED]> wrote:
> Am Montag, 18. Juli 2005 18:46 schrieb yin:
> > [...]
> > ld-options: -L/usr/lib -Wl -rpath /usr/lib -lSDL
>
> This looks a bit suspicious: The syntax for ld options is "-rpath DIR", so the
> option for gcc should be "-Wl,-rpath,DIR". Ugly, but I
Bernard Pope wrote:
>On Wed, 2005-07-20 at 11:43 +0200, yin wrote:
>
>>
>>how do I convert an Word32 (or WordXYZ) to Int, or Integer, or Float,
>>...? The Int conversion is the priority.
>>
>>
>fromIntegral to convert to an instance of Integral, such as Int, Integer
>etc
>
Thank you, but how t
Arthur van Leeuwen <[EMAIL PROTECTED]> worte:
> Ah, but this is exactly where lazyness wins bigtime: a smart
> implementation
> of readFile will lazily read the actual file for as far as needed. Thus,
> reading with readFile will not read the entire file into memory at once.
> What will happen is t
On Wed, 20 Jul 2005, Sun Yi Ming wrote:
> mix :: [a] -> [a] -> [a]
> mix [] ys = ys
> mix xs [] = xs
> mix (x:xs) (y:ys) = [x,y] ++ mix xs ys
mix xs ys = concat (Data.List.transpose [xs,ys])
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On Wed, 2005-07-20 at 11:43 +0200, yin wrote:
> hello,
>
> how do I convert an Word32 (or WordXYZ) to Int, or Integer, or Float,
> ...? The Int conversion is the priority.
>
> Thanks.
>
> Matej 'Yin' Gagyi
fromIntegral to convert to an instance of Integral, such as Int, Integer
etc
Cheers,
Ber
To get exact fractions, use the Ratio module (import Ratio) and the
Rational type which is defined there.
Thanks dude, it works
The code you wrote below has a serious style problem that I thought
I'd point out: you shouldn't use the IO monad for pure functions.
I've never known that, th
hello,
how do I convert an Word32 (or WordXYZ) to Int, or Integer, or Float,
...? The Int conversion is the priority.
Thanks.
Matej 'Yin' Gagyi
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On Wed, 2005-07-20 at 14:27 +0800, Sun Yi Ming wrote:
[snip]
> i first write this snippet of code:
> ---
> import System.IO
>
> mix :: [a] -> [a] -> [a]
> mix [] ys = ys
> mix xs [] = xs
> mix (x:xs) (y:ys) = [x,y] ++ mix xs ys
>
> f1 = do contents1 <- readFile "url1.txt"
> content
Am Montag, 18. Juli 2005 18:46 schrieb yin:
> [...]
> ld-options: -L/usr/lib -Wl -rpath /usr/lib -lSDL
This looks a bit suspicious: The syntax for ld options is "-rpath DIR", so the
option for gcc should be "-Wl,-rpath,DIR". Ugly, but I didn't invent
that. :-) Furthermore, I've never seen a Linu
On Wed, Jul 20, 2005 at 02:27:36PM +0800, Sun Yi Ming wrote:
> Hello,
> I have two txt file,and i want to mix the two files line by line, e.g.
> $ cat url1.txt
>url1_1.line
>url1_2.line
> $ cat url2.txt
>url2_1.line
>url2_2.line
> and i want this file as result:
> $ cat aha.tx
Sun Yi Ming wrote:
> Hello,
Hello,
> this works fine, but i think if the two file are very big, and the
> readFile will consume too many mem.so i need to read the file line by
> line but stunned by the loop in IO Monad:
>
> main = do h1 <- openFile "url1.txt" ReadMode
> h2 <- openFile "url2.txt"
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