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:
snip
I've always been a little bothered by the MonadPlus class: zero and
plus are associated (no pun intended) in my
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
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
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 of
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 in the past
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
David result)
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,
a couple of
Conor McBride [EMAIL PROTECTED] wrote:
snip
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
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 this
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 fail).
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
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
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