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From: Wolfgang Jeltsch <wolfgang_at_cs.ioc.ee>

Date: Fri, 19 Apr 2013 22:35:08 +0300

Hi,

in Curry, we can define a generic function inversion operator as

follows:

*> inverse :: (a -> b) -> (b -> a)
*

*> inverse f y | f x =:= y = x where x free
*

Given that KiCS2 supports functional patterns, I tried to implement

function inversion in a simpler way as follows:

*> inverse :: (a -> b) -> (b -> a)
*

*> inverse f (f x) = x
*

However, this does not work. Neither does the following:

*> inverse :: (a -> b) -> (b -> a)
*

*> inverse f = \ (f x) -> x
*

I’m pretty sure that these alternative implementations are not covered

by the functional patterns extension, but I wonder whether it would be

reasonable to extend Curry even more such that the above code snippets

are accepted. What do you think?

Best wishes,

Wolfgang

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Received on Fr Apr 19 2013 - 22:22:37 CEST

Date: Fri, 19 Apr 2013 22:35:08 +0300

Hi,

in Curry, we can define a generic function inversion operator as

follows:

Given that KiCS2 supports functional patterns, I tried to implement

function inversion in a simpler way as follows:

However, this does not work. Neither does the following:

I’m pretty sure that these alternative implementations are not covered

by the functional patterns extension, but I wonder whether it would be

reasonable to extend Curry even more such that the above code snippets

are accepted. What do you think?

Best wishes,

Wolfgang

_______________________________________________

curry mailing list

curry_at_lists.RWTH-Aachen.DE

http://MailMan.RWTH-Aachen.DE/mailman/listinfo/curry

Received on Fr Apr 19 2013 - 22:22:37 CEST

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