Hi folks,
I would like to use Arrows, but I just can't figure out how to actually use them. I looked at various documentations including the API doc [1], the Wiki [2], [3], and some random pages on the net but didn't find a single simple example that tells me how to apply an Arrow to a value.
Assume I have the extremly simple arrow such as:
MyAdd1A :: (Arrow a, Num b) => a b b MyAdd1A = arr (\ x -> x + 1 )
I am probably totally wrong, buy I look for something like evaluateArrow with the type:
evaluateArrow :: (Arrow a) => a b c -> b -> cto use it like:
main = do let x = evaluateArrow $ MyAdd1A 1
print x
Please enlighten me!
Georg
[1] http://www.haskell.org/ghc/docs/latest/html/libraries/base/Control.Arrow.html#2 [2] http://haskell.org/hawiki/UnderstandingArrows [3] http://www.haskell.org/arrows/
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---- Georg Martius, Tel: (+49 34297) 89434 ---- ------- http://www.flexman.homeip.net --------- _______________________________________________ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell
