Hi
Sorry to take so long: I've spent a week watching paint dry, so I can
confirm that this is more interesting.
Jon Cast wrote:
>
> Conor McBride <[EMAIL PROTECTED]> wrote:
>
>
> > I've always been a little bothered by the MonadPlus class: zero and
> > plus are associated (no pun intended) in
At 07:05 15/12/03 -0500, David Roundy wrote:
My or_maybe is just defined as
or_maybe (Just e) _ = Just e
or_maybe Nothing f = f
which is pretty simple...
Indeed... I have been tending to do something similar inline...
I'm finding there's a tension between having lots of auxilliary functions
and
Conor McBride <[EMAIL PROTECTED]> wrote:
> I've always been a little bothered by the MonadPlus class: zero and
> plus are associated (no pun intended) in my mind with monoidal
> structure. Is there more to MonadPlus than a clumsy workaround for
> the lack of quantified constraints?
Yes. For ev
Hi
David Roundy wrote:
>
> On Mon, Dec 15, 2003 at 08:55:10AM +, Graham Klyne wrote:
> > I apologize... my question was unclear.
> >
> > It was not the standard MonadPlus class and functions that I was asking
> > about, but the specific instance for Maybe (i.e. or_maybe). As it happens,
> >
> "David" == David Roundy <[EMAIL PROTECTED]> writes:
David> My or_maybe is just defined as
David> or_maybe (Just e) _ = Just e or_maybe Nothing f = f
David> which is pretty simple, so you can run a series of calculations
David> (assuming you want to keep the first that has a non-Nothing
Dav
> "Graham" == Graham Klyne <[EMAIL PROTECTED]> writes:
Graham> I apologize... my question was unclear. It was not the
Graham> standard MonadPlus class and functions that I was asking
Graham> about, but the specific instance for Maybe (i.e. or_maybe).
Graham> As it happens, a couple of times i
On Mon, Dec 15, 2003 at 08:55:10AM +, Graham Klyne wrote:
> I apologize... my question was unclear.
>
> It was not the standard MonadPlus class and functions that I was asking
> about, but the specific instance for Maybe (i.e. or_maybe). As it happens,
> a couple of times in the past couple
I apologize... my question was unclear.
It was not the standard MonadPlus class and functions that I was asking
about, but the specific instance for Maybe (i.e. or_maybe). As it happens,
a couple of times in the past couple of weeks, I might have used such a
function if it were available in th
On Fri, 12 Dec 2003 20:55:59 +
Graham Klyne <[EMAIL PROTECTED]> wrote:
> At 14:17 12/12/03 -0500, Derek Elkins wrote:
> >This will also provide a migration path if you want a more featureful
> >monad. (or_maybe is mplus, fail or mzero can be used for Nothing
> >when you explicitly want to fai
On Fri, Dec 12, 2003 at 08:55:59PM +, Graham Klyne wrote:
> At 14:17 12/12/03 -0500, Derek Elkins wrote:
> >This will also provide a migration path if you want a more featureful
> >monad. (or_maybe is mplus, fail or mzero can be used for Nothing when
> >you explicitly want to fail).
>
> Is th
On Fri, Dec 12, 2003 at 08:55:59PM +, Graham Klyne wrote:
> At 14:17 12/12/03 -0500, Derek Elkins wrote:
> >This will also provide a migration path if you want a more featureful
> >monad. (or_maybe is mplus, fail or mzero can be used for Nothing when
> >you explicitly want to fail).
>
> Is th
At 14:17 12/12/03 -0500, Derek Elkins wrote:
This will also provide a migration path if you want a more featureful
monad. (or_maybe is mplus, fail or mzero can be used for Nothing when
you explicitly want to fail).
Is this or_maybe (and friends) actually defined in any of the standard
libraries?
On Fri, 12 Dec 2003 07:24:04 -0500
David Roundy <[EMAIL PROTECTED]> wrote:
Other libraries are Daan's DData, http://www.cs.uu.nl/~daan/ddata.html,
and Edison, http://cvs.sourceforge.net/viewcvs.py/hfl/hfl/edison/ (or
the version in the old hslibs), however nothing jumps out at me as doing
exactly
Hello everyone,
I am trying to restructure some of my code to eliminate some O(n^2)
operations, and have realized that this will require a change in how my
data is represented, but I don't see any standard data types (in Data) that
will really suit my needs.
Currently I have a sequence of patches
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