Dear Haskell Folks,
Release Candidate 11 of the H98 FFI Addendum 1.0 is now
available from
http://www.cse.unsw.edu.au/~chak/haskell/ffi/
The change log since RC 10 is appended below.
Again, please review this specification carefully. If no
suggestion that leads to a serious change is made wi
Ross Paterson <[EMAIL PROTECTED]> wrote,
> > Great care should be exercised in the use of this function. Not only
> > because of the danger of introducing side effects, but also because
> > \code{unsafePerformIO} may compromise typing; in particular, the result of
> > \code{unsafePerformIO} shoul
John Hughes <[EMAIL PROTECTED]> wrote,
> "should always have" is unfortunately ambiguous: does it mean "you should
> ensure that...", or "we believe that..., but we're not completely sure". I
> suggest changing the last phrase to
>
> ...; to avoid this, the programmer should ensure that the resul
google: "What the hell are Monads"
http://www.abercrombiegroup.co.uk/~noel/research/monads.html
IO in haskell is really easy, iff you understand the sense of monads.
to understand sth. like "IO Bool" you have to remember that i.e. an array is no
defined data type without the definition of its e
Filip wrote:
> So how to write function that will wait until Handle is ready for reading ??
hWaitForInput :: Handle -> Int -> IO Bool
hWaitForInput h t = ...
Waits until Handle h is ready for reading or t milliseconds have elapsed.
--
Glynn Clements <[EMAIL PROTECTED]>
___
On Wednesday, 2003-06-11, 20:00, Filip wrote:
> I have a question :)
> What should I do if I have something like "IO Bool" and I need "Bool" ??
> And the same with other IO +something.
This is a question which arises very often on this list. I think, you should
read a tutorial like the Gentle Int
On Wednesday, 2003-06-11, 18:54, Filip wrote:
> So how to write function that will wait until Handle is ready for reading ??
It would be very bad to use a while loop for this like
while (!is_ready(handle)) /* do nothing */;
which is called active waiting. Your processor is busy all the time do
On Wed, 11 Jun 2003 20:00:00 +0200
Filip <[EMAIL PROTECTED]> wrote:
> What should I do if I have something like "IO Bool" and I need "Bool"
IO Bool means "an action that can perform IO and returns a Bool". You
can't get a Bool without performing IO with that function, so you can't
get a Bool from
On Wed, 11 Jun 2003 20:00:00 +0200
Filip <[EMAIL PROTECTED]> wrote:
> I have a question :)
> What should I do if I have something like "IO Bool" and I need "Bool"
> ??
Read the "Gentle Introduction"
http://www.haskell.org/tutorial/
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On Wed, 11 Jun 2003 09:19:46 +0200 (MET DST)
Koen Claessen <[EMAIL PROTECTED]> wrote:
> Derek Elkins wrote:
>
> | The question (at least to me) is more, 'you can
> | satisfy the RefMonad interface with STRefs or IORefs,
> | but those use "imperative" features under the hood;
> | can it be sat
Look through the mailing list archives/wiki/haskell tutorials. But
basically you can't, except by combining it with another action, as in:
suppose 'baz :: Int -> IO Bool', then:
foo = do
bar <- baz 5
if bar
then ...
else ...
for instance...
--
Hal Daume III
I have a question :)
What should I do if I have something like "IO Bool" and I need "Bool" ??
And the same with other IO +something.
Thank You :)
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On Wed, Jun 11, 2003 at 09:39:24AM -0700, Hal Daume III wrote:
> It depends how much you mean "like" :). Usually whatever you would solve
> using a while loop in an imperative language is solved with recursion in
> Haskell.
>
> The problem with directly having 'while' is that such a statement
> d
So how to write function that will wait until Handle is ready for reading ??
And is there something like "if" ??
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It depends how much you mean "like" :). Usually whatever you would solve
using a while loop in an imperative language is solved with recursion in
Haskell.
The problem with directly having 'while' is that such a statement
depends necessarily on mutable variables (otherwise, if the condition is
'tr
I have a stupid question :)
Is there something like "while" loop in GHC ??
Thanks very much :)
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I have a stupid question :)
Is there something like "while" loop in GHC ??
Thanks very much :)
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===
5th International Workshop
on Soft
Constraints Held in conjunction
with 9th International Conference on Principles
and Practice of Constraint Programming, CP2003 Actons Hot
Call for organizers:
The Advanced Functional Programming School, 2004
http://www.cs.uu.nl/~johanj/afp/
We solicit plans for organizing the next Advanced Functional Programming
School. Since 1995 there have been four Schools on Advanced Functional
Programming in
* 2002, LNCS 2638, Oxford,
Someone asked me:
| I don't recall the message you are referring to, and I
| can't find it in the archive. Can you point me at it?
Sorry, I meant:
http://www.haskell.org/pipermail/haskell/2001-September/007922.html
/K :-)
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Derek Elkins wrote:
| The question (at least to me) is more, 'you can
| satisfy the RefMonad interface with STRefs or IORefs,
| but those use "imperative" features under the hood;
| can it be satisfied without them?'
As I showed in the message that spawned off this discussion,
this is indeed
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