Hi Alex,
I hope not to spoil your fun but have you had a look at this:
Write Yourself a Scheme in 48 Hours
http://halogen.note.amherst.edu/~jdtang/scheme_in_48/tutorial/overview.html
Regards,
titto
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PR Stanley wrote:
Yes and thanks for the reply.
When a function is declared in C the argument variable has an address
somewhere in the memory:
int f ( int x ) {
return x * x;
}
any value passed to f() is assigned to x. x is the identifier for a real
slot in the memory (the stack most likely)
The latest version of SOE comes with a wrapper for a nice GLFW library. This
library comes with a demo of a 3D bouncing "Amiga" ball so it must be the
best library in the world ;-) ;-)
Since I'm letting my students play with WinHugs, I would prefer to have a
WinHugs compatible version of that l
Hi
The following is from the Hutton book:
Without looking at the standard prelude, define the
higher-order library function curry that converts a function
on pairs into a curried
function, and conversely, the function uncurry
that converts a curried
Hallo,
On 10/3/07, Pasqualino 'Titto' Assini <[EMAIL PROTECTED]> wrote:
> Hi Alex,
>
> I hope not to spoil your fun but have you had a look at this:
>
> Write Yourself a Scheme in 48 Hours
> http://halogen.note.amherst.edu/~jdtang/scheme_in_48/tutorial/overview.html
>
Yes, I'm actually using
On Wed, Oct 03, 2007 at 12:01:50AM +0200,
Twan van Laarhoven <[EMAIL PROTECTED]> wrote
a message of 24 lines which said:
> Lots of people wrote:
> > I want a UTF-8 bikeshed!
> > No, I want a UTF-16 bikeshed!
Personnally, I want an UTF-32 bikeshed. UTF-16 is as lousy as UTF-8
(for both of them,
On 10/3/07, PR Stanley <[EMAIL PROTECTED]> wrote:
> Without looking at the standard prelude, define the
> higher-order library function curry that converts a function
> on pairs into a curried
> function, and conversely, the function uncurry
> that converts a
> > What the heck does it matter what encoding the library uses
> > internally?
>
> +1 It can even use a non-standard encoding scheme if it wants.
Sounds good to me. I (think) one of my initial questions was if the
encoding should be visible in the type of the UnicodeString type or
not. My gut fee
On Wed, 2007-10-03 at 22:31 +1000, Stuart Cook wrote:
> On 10/3/07, PR Stanley <[EMAIL PROTECTED]> wrote:
> > Without looking at the standard prelude, define the
> > higher-order library function curry that converts a function
> > on pairs into a curried
> > function
Lots of external libraries contain state, but one that really contains a
*lot* of state is the OpenGL libraries, since OpenGL is specified as a
statemachine.
This means that when you're writing structured code you quite often want
to save and restore chunks of state 'automatically'. For the ve
In the (Win)Hugs documentation, I found
"Only the ccall, stdcall and *dotnet *calling conventions are supported.
All others are flagged as errors."
However, I fail to find any more information on how to invoke dotnet
methods. This might be really handy for me, as I'm very familiar with
the d
On Wed, 2007-10-03 at 14:15 +0200, Stephane Bortzmeyer wrote:
> On Wed, Oct 03, 2007 at 12:01:50AM +0200,
> Twan van Laarhoven <[EMAIL PROTECTED]> wrote
> a message of 24 lines which said:
>
> > Lots of people wrote:
> > > I want a UTF-8 bikeshed!
> > > No, I want a UTF-16 bikeshed!
>
> Person
Hello all,
I have recently developed a small set of bindings for a C library, and
encountered a problem that I think could be interesting to others.
My problem was that the C function I was writing bindings to expects to
be passed a FILE *. So, I had basically two possibles routes to t
On 10/3/07, PR Stanley <[EMAIL PROTECTED]> wrote:
>
> I didn't even know about the curry and uncurry functions. I'm not
> looking for the answer but some guidance would be much appreciated.
> Thanks, Paul
You can look at the types without seeing the implementation, too. Just start
up GHCI and typ
Hello Maxime,
Wednesday, October 3, 2007, 7:57:58 PM, you wrote:
> And then I discovered Foreign.Concurrent, which allows one to associate
> a plain Haskell IO action to a pointer. The 'Foreign.Concurrent' name
> is a bit misleading to me; it seems this module is named so because it
> needs conc
Hi,
I'm playing a little bit with pointfree and function composition and
I would like to ask you if the following is theoretical correct and
how can I express it in haskell.
Imagine that I have the following functions
f :: a -> b -> c -> d
g :: d -> e
I want to compose these two func
I think you want to use "wrapper" functions from the FFI:
type HsPlayerFinalizer = Ptr PlayerStruct -> IO ()
foreign import ccall "wrapper" mkPlayerFinalizer :: HsPlayerFinalizer
-> IO (FunPtr HsPlayerFinalizer)
You can then make an arbitrary Haskell function (including a partially
applied functi
On Tuesday 02 October 2007 19:51:47 Anatoly Yakovenko wrote:
> > If its specifically the list instance, where we currently trade laziness
> > for efficiency of encoding (which may or may not be the right thing),
> > I'd suggest a fully lazy encoding instance?
>
> Its not really a list, its more of
On 10/3/07, Tiago Miguel Laureano Alves <[EMAIL PROTECTED]> wrote:
> Imagine that I have the following functions
>f :: a -> b -> c -> d
>g :: d -> e
>
> I want to compose these two functions such that:
>(g . f) :: a -> b -> c -> e
Here's a pointfree derivation of the composition functi
Spencer Janssen wrote:
On Tuesday 02 October 2007 19:51:47 Anatoly Yakovenko wrote:
If its specifically the list instance, where we currently trade laziness
for efficiency of encoding (which may or may not be the right thing),
I'd suggest a fully lazy encoding instance?
Its not really a list, i
Here is a generalized version, using type classes and some extensions.
Tiago, in order to compile this you'll have to use:
-fglasgow-exts -fallow-undecidable-instances -fallow-overlapping-instances
Cheers,
Jorge.
-
module Main where
class Pipeline t1 t2 t3 | t1 t2 -> t3 where
On Wed, Oct 03, 2007 at 05:57:58PM +0200, Maxime Henrion wrote:
> I have recently developed a small set of bindings for a C library, and
> encountered a problem that I think could be interesting to others.
>
> My problem was that the C function I was writing bindings to expects to
> be passed a FI
Greetings.
I have a PC that had GHC 6.6 running on it. Worked fine. Then I
uninstalled 6.6 and installed 6.6.1, and now it doesn't appear to work
at all. Any attempt to run GHC results in a message that says
The entry point OpenThread could not be found in KERNEL32.dll.
or something very si
One of the "holes" in real-world Haskell is you never know if a
library/function is calling unsafePerformIO and you have to trust the
library author. I recognize the necessity of the function, but should it
announce itself? unsafePerformIO has this type:
unsafePerformIO :: IO a -> a
Would there
> ...and indeed it can't be done, except by the naive brute-force method
> of comparing every subtree, possibly optimized by cryptographically
> hashing a representation of every subtree, since sharing isn't an
> observable property.
i was thinking that instead of having a reference to a node, eac
On 10/3/07, Victor Nazarov <[EMAIL PROTECTED]> wrote:
>
> But how would you know that evil dictator uses unsafePerformIO???
You don't. unsafePerformIO can't be taken it away (there are legitimate
reasons to strip IO), which is why I wonder if it's useful at all.
p.s. CC'ed to haskell-cafe
_
On Wed, 2007-10-03 at 14:47 -0700, Justin Bailey wrote:
> One of the "holes" in real-world Haskell is you never know if a
> library/function is calling unsafePerformIO and you have to trust the
> library author. I recognize the necessity of the function, but should
> it announce itself? unsafePerfo
Stefan O'Rear wrote:
> On Wed, Oct 03, 2007 at 05:57:58PM +0200, Maxime Henrion wrote:
> > I have recently developed a small set of bindings for a C library, and
> > encountered a problem that I think could be interesting to others.
> >
> > My problem was that the C function I was writing bindings
On 10/4/07, Justin Bailey <[EMAIL PROTECTED]> wrote:
> On 10/3/07, Victor Nazarov <[EMAIL PROTECTED]> wrote:
> > But how would you know that evil dictator uses unsafePerformIO???
>
> You don't. unsafePerformIO can't be taken it away (there are legitimate
> reasons to strip IO), which is why I wond
On Thu, Oct 04, 2007 at 12:55:41AM +0200, Maxime Henrion wrote:
> When writing the binding for foo_new(), I need to open a file with
> fopen() to pass it the FILE *. Then I get a struct foo * that I can
> easily associate the the foo_destroy() finalizer. However, when
> finalizing the struct foo
Hi,
I am trying to write an interpreter for a little functional language but I am
finding very problematic to dynamically create a typed representations of the
language terms.
I have googled around and found a few solutions but none seem to solve the
problem.
This is the example code:
>
I need some help with space and time leaks.
I know of two types of space leak. The first type of leak occurs when
a function uses unnecessary stack or heap space.
GHCi> sum [1..10^6]
*** Exception: stack overflow
Apparently, the default definition for "sum" has a space leak.
I can define my ow
Pasqualino 'Titto' Assini wrote:
> I am trying to write an interpreter for a little functional language but I am
> finding very problematic to dynamically create a typed representations of the
> language terms.
>
> > The problem is to write a function that converts between Exp and Term
> > t as in
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