[Haskell-cafe] How to declare a Typeless Function

[Magnus Therning]

On Fri, Jul 3, 2009 at 4:43 AM, Alexander
Dunlap<alexander.dunlap at gmail.com> wrote:
> swap :: Array (Int, Int) a -> [Int] -> Array (Int, Int) a
>
> The lowercase "a" means that that type variable is polymorphic, i.e.
> it can be any type.

Another option would be to simply not put in type of 'swap', load it
in ghci and see what the compiler says the type is :-)

/M

> On Thu, Jul 2, 2009 at 8:05 PM, Fernan Bolando<fernanbolando at mailc.net> wrote:
>> Hi
>>
>> I have a function that swaps rows of an array of double
>>
>> swap :: Array (Int,Int) Double -> [Int] -> Array (Int,Int) Double
>>
>> I then create a function that swaps rows of arrays of Complex Double
>>
>> swap :: Array (Int, Int) (Complex Double) -> [Int] -> Array (Int, Int)
>> (Complex Double)
>>
>> In reality the function swap does not care whether its working on a
>> double or a complex number.
>> how do I declare swap so that it will work whether it's a complex or a
>> double array.
>>
>> I tried googling but I wasn't sure what to google.
>>
>> fernan
>> --
>> http://www.fernski.com
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-- 
Magnus Therning                        (OpenPGP: 0xAB4DFBA4)
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