In article <[EMAIL PROTECTED]>,
[EMAIL PROTECTED] (Carl R. Witty) wrote:
> Here's a hand-waving argument that you need either Typeable (or
> something else that has a run-time concrete representation of types)
> or ST/STRef (or something else, probably monadic, that can track
> unique objects) to
"Simon Peyton-Jones" <[EMAIL PROTECTED]> writes:
> | Conjecture: It's impossible to implement RefMonad directly in Haskell
> | without making use of built-in ST or IO functionality and without
> unsafe or
> | potentially diverging code (such as unsafeCoerce).
>
> A more concrete way to formulate
so, I have been wanting to implement serialize to database functionality
for haskell in a certain way which may or may not be possible..
what would be nice is if I could dump an entire complex haskell data
structure (perhaps cyclic, but not infinite) to a hash-table database
(like berkeley db). p
On Thursday, 2003-06-12, 21:02, CEST, Dean Herington wrote:
> On Thu, 12 Jun 2003, Wolfgang Jeltsch wrote:
> > [...] You can then examine t as in the following example:
> > t <- try (hGetLine h1)
> > case t of
> > Left error | isEOFError error
> > -> do
> > Righ
On Thu, 12 Jun 2003, Wolfgang Jeltsch wrote:
> On Thursday, 2003-06-12, 18:01, CEST, Filip wrote:
> > Hi,
> >
> > I wrote something like "let t = try (hGetLine h1)" and I would like to check
> > is it EOFError or not. How can I do this ??
> >
> > Thanks
>
> Hello,
>
> the above code assigns the
On Thu, 12 Jun 2003, Niels Reyngoud wrote:
> Hello,
>
> We're two students from the department of computer science at the
> University of Utrecht (the Netherlands), and we're havind some severe
> difficulties in working
> with file handles in Haskell. Consider for example the following program
> Hello,
>
> We're two students from the department of computer science at the
> University of Utrecht (the Netherlands), and we're havind some severe
> difficulties in working
> with file handles in Haskell. Consider for example the following program:
>
> main = do --let inputfile = "input.t
> main = do --let inputfile = "input.txt"
> let inputtext = "testit"
> let outputfile = "output.txt"
> writeFile outputfile ""
> handle2 <- openFileEx outputfile (BinaryMode WriteMode)
> hPutStr handle2 (inputtext ++ " extra")
>
> handle3 <- openFil
I believe this is related to the topic discussed a few weeks ago. See
http://haskell.org/pipermail/haskell/2003-May/011851.html
and responses.
At least, this is most likely the curprit of your second problem.
I'm not so sure about the first one. I would expect "testit extratestit
extra2" to
On Thursday, 2003-06-12, 18:01, CEST, Filip wrote:
> Hi,
>
> I wrote something like "let t = try (hGetLine h1)" and I would like to check
> is it EOFError or not. How can I do this ??
>
> Thanks
Hello,
the above code assigns the I/O action
try (hGetLine h1)
to t. I suppose you want to assign
Hello,
We're two students from the department of computer science at the
University of Utrecht (the Netherlands), and we're havind some severe
difficulties in working
with file handles in Haskell. Consider for example the following program:
main = do --let inputfile = "input.txt"
let in
Hi,
I wrote something like "let t = try (hGetLine h1)" and I would like to check is it
EOFError or not. How can I do this ??
Thanks
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