On 2008 May 21, at 12:31, Bulat Ziganshin wrote:
Wednesday, May 21, 2008, 8:11:56 PM, you wrote:
Suppose p1, p2, p3 are 3 predicates
that take an input -- say, a String.
They return either (True, result)
or False.
if they return Just result or Nothing - yes, use Maybe as mona
Thanks to all who has replied in such a short time.
>From your reponses, I looked at the definition of `mplus`
Nothing `mplus` ys = ys
xs `mplus` _ = xs
It catches the essence of what I am trying to do!
Later, if pn grows in number, I can scale up by using
some-kind-of-zero with so
On further thought, better to use the Maybe afterall. You can use Nothing
to signify your False and Just to signify your result.
case p1 s of
Just result -> result
Nothing -> case p2 s of ...
That's probably more intuitive to what you were intending.
Chris.
On Wed, 21 May 2008, C.M.Brown wr
On Wed, 21 May 2008, HP Wei wrote:
>
> Suppose p1, p2, p3 are 3 predicates
> that take an input -- say, a String.
> They return either (True, result)
> or False.
>
> I want to get an effect like in this expression:
>
> case p1 s of
>(True, r) -> r
>False -> case p2 s of
>
Am Mittwoch, 21. Mai 2008 18:31 schrieb Bulat Ziganshin:
> Hello HP,
>
> Wednesday, May 21, 2008, 8:11:56 PM, you wrote:
> > Suppose p1, p2, p3 are 3 predicates
> > that take an input -- say, a String.
> > They return either (True, result)
> > or False.
>
> impossible because these
Hello HP,
Wednesday, May 21, 2008, 8:21:01 PM, you wrote:
> In the linker ld, there is a -R option
example of passing option to ld:
ghc ... -optl-Xlinker -optl--large-address-aware
-optl-Xlinker may be optional
--
Best regards,
Bulatmailto:[EMAIL PROTECTED]
__
Hello HP,
Wednesday, May 21, 2008, 8:11:56 PM, you wrote:
> Suppose p1, p2, p3 are 3 predicates
> that take an input -- say, a String.
> They return either (True, result)
> or False.
impossible because these are different types :))
if they return Just result or Nothing - yes, us
In the linker ld, there is a -R option
to encode lib-search-directories into the
object file.
Can we not do that in compiling this
ghc -o foo --make foo.hs
???
Thanks
HP
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h
Suppose p1, p2, p3 are 3 predicates
that take an input -- say, a String.
They return either (True, result)
or False.
I want to get an effect like in this expression:
case p1 s of
(True, r) -> r
False -> case p2 s of
(True, r) -> r
False -> ca
