Re: [Haskell-cafe] Quick Question for QuickCheck2

I'm just trying these examples, and I can't figure out how to import quickcheck2 rather than quickcheck1. I've looked around but I can't seem to find any information on this. How do I do it? Thanks! On Mon, Aug 30, 2010 at 11:56 PM, John Millikin wrote:

Define a custom element generator, which has characters with your desired values:

myRange :: Gen Char myRange = elements (['A'..'Z'] ++ ['a' .. 'z'] ++ " ~!@#$%^&*()")

You can use "forAll" to run tests with a specific generator:

forAll myRange $ \c -> chr (ord c) == c

On Mon, Aug 30, 2010 at 08:12, Sebastian Höhn wrote:

...

Hello,

perhaps I am just blind or is it a difficult issue: I would like to generate Char values in a given Range for QuickCheck2. There is this simple example from the haskell book:

instance Arbitrary Char where   arbitrary = elements (['A'..'Z'] ++ ['a' .. 'z'] ++ " ~!@#$%^&*()")

This does not work in QuickCheck2 since the instance is already defined. How do I achieve this behaviour in QC2?

Thanks for helping.

Sebastian _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

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