Alistair Bayley wrote:
There's a small problem: how to write a factory function that returns values
of various subtypes. The makeSubType function below won't compile, obviously
because the returns types are different (they're not the same 'm').
Indeed, expressions in both branches of an `if'
Gracjan Polak [EMAIL PROTECTED] writes:
intern :: Ord a = a - a
intern x = unsafePerformIO $ internIO x
iorefset :: Ord a = IORef(Map.Map a a)
iorefset = unsafePerformIO $ do
newIORef $ Map.empty
It will not work because you can't put values of different types as
keys of the same
Hi,
I was wondering if I hat missed something and it was possible to
do this within the Haskell type system or not...
Essentially I would like some sort of inderritance property for
Haskell types, I often find myself wanting to for example extend a
tree with black/white colouring, or
On Wed, 1 Jun 2005, Thomas Davie wrote:
Hi,
I was wondering if I hat missed something and it was possible to
do this within the Haskell type system or not...
Essentially I would like some sort of inderritance property for
Haskell types, I often find myself wanting to for example extend
On 1 Jun 2005, at 15:54, Henning Thielemann wrote:
On Wed, 1 Jun 2005, Thomas Davie wrote:
Hi,
I was wondering if I hat missed something and it was possible to
do this within the Haskell type system or not...
Essentially I would like some sort of inderritance property for
Haskell
On Wed, 1 Jun 2005, Thomas Davie wrote:
On 1 Jun 2005, at 15:54, Henning Thielemann wrote:
What about
data MyTree a = Branch a (MyTree a) (MyTree a) | Node a
and the types
MyTree ()
MyTree Bool
MyTree (Bool, Int)
?
That's exactly what I would normally do, but my data
Hi,
I'm trying to use Wash with GHC 6.4. I have applied the patch from
http://article.gmane.org/gmane.comp.lang.haskell.libraries/3160, and now
it at least compiles. However, despite using -package WASH -package
WASH-CGI -package WASHHTML, ghc is not automatically sending the
input files
My apologies if this sounds like a bit of a rant; I know people put good
effort into this, but
The Network.CGI module in fptools (and GHC) is not very useful. I think
that it should be removed or re-tooled. Here are the main problems with
it:
1. It does not permit custom generation of
Hello,
I have done all of those things in WASH. But, don't let that stop you
from writing something better :) I think some people started a project
to write a CGI interface based on a 'Category' -- where a 'Category'
is like an 'Arrow' without the 'pure/arr' function...
Jeremy Shaw.
At Wed, 1
Hello Stijn,
Tuesday, May 31, 2005, 2:36:07 PM, you wrote:
SDS Yes. Many people I know state the functional part as a big reason why
SDS they chose python.
are you know Ruby? :) it has all the same stuff, including code
blocks, which can refer to variables from outer context
for example,
On Wed, Jun 01, 2005 at 10:54:54AM -0700, Jeremy Shaw wrote:
Hello,
I have done all of those things in WASH. But, don't let that stop you
from writing something better :) I think some people started a project
to write a CGI interface based on a 'Category' -- where a 'Category'
is like an
Shameless plug warning.
From what I can tell, there are two problems with WASH:
1) Everything must be done the WASH way
2) WASH is mostly broken with GHC 6.4
Let me elaborate a bit on #1.
Let's say I have a CGI interface pre-defined; I take certain parameters
from a GET request and
I'd like to hear more about people using Arrows-minus-arr, as I ran into
the same in a project I'm working on for interactive construction of
GUI-wrapped functional values code.
- Conal
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jeremy Shaw
Hi -
Brace yourself... I work in an environment where FORTH is still used.
I've been thinking about writing a G-machine interpreter in FORTH
so that one could write Haskell like programs that would compile down
and run graph-reduction style on the FORTH machine.
Many developers think
Andrew Harris writes:
Brace yourself... I work in an environment where FORTH is still used.
I've been thinking about writing a G-machine interpreter in FORTH
so that one could write Haskell like programs that would compile down
and run graph-reduction style on the FORTH machine.
let
Actually I am very impressed from the FORTH simplicity and efficiency.
I was developing one FORTH system for DOS a couple of years ago and I
think it is very useful for small programs that have to perform low
level/hardware tasks. Unfortunatelly it doesn't scale well for larger
applications. I
I always thought Forth was way cool, but I've never managed to get anything
significant written in it. I think that Forth has echoes of the
point-free style in Haskell, but Haskell is a lot friendlier.
Is the Forth environment part of the hardware? If your Forth is just a
threaded interpreter
G'day all.
Quoting Thomas Davie [EMAIL PROTECTED]:
Essentially I would like some sort of inderritance property for
Haskell types, I often find myself wanting to for example extend a
tree with black/white colouring, or later extend the tree with some
sort of ID, etc.
Have you had a look at
Andrew Harris wrote:
I've been thinking about writing a G-machine interpreter in FORTH
so that one could write Haskell like programs that would compile down
and run graph-reduction style on the FORTH machine.
Many developers think FORTH is nice, but the language is so, shall
we say,
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