Looks very nice!
thanks!-)
it is far from a full-blown solution to the question in the subject, but it has
its uses.
However, I'm doing my learning on ghci and got an error when I tried to load it.
Is this hugs only, or should I try harder?
I was using Hugs when I wrote that, but it works in GHC almost as well. the
error message really ought to point to the option needed, which is
-fglasgow-exts
if you don't want to set the options by hand, just add the following pragma to
the top of R.hs:
{-# OPTIONS_GHC -fglasgow-exts #-}
more annoying is that ghci will ignore the default directive, so you'll need to
give explicit types when you want representations:
*Main> foldr (+) 0 [1..4]
10
*Main> foldr (+) 0 [1..4] :: R Int
(1 + (2 + (3 + (4 + 0))))
*Main> map (*) [1,2]
<interactive>:1:0:
No instance for (Show (t -> t))
arising from use of `print' at <interactive>:1:0-12
Possible fix: add an instance declaration for (Show (t -> t))
In the call (print it)
In the expression: print it
In a 'do' expression: print it
*Main> map (*) [1,2] :: [R Int -> R Int]
[\x->(1 * x),\x->(2 * x)]
claus
2007/1/11, Malcolm Wallace <[EMAIL PROTECTED]>:
Bulat Ziganshin <[EMAIL PROTECTED]> wrote:
> tphyahoo wrote:
>
> > *UnixTools> explodeLambda( map (*) [1,2] )
> >[(\x ->> 1*x),(\x -> 2*x)]
Have a play with this, from Claus Reinke:
http://www.cs.kent.ac.uk/people/staff/cr3/toolbox/haskell/R.hs
Regards,
Malcolm
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