[Haskell-cafe] "record" types and unique names

[Aaron Gray]

On 30 December 2010 17:23, Markus Läll <markus.l2ll at gmail.com> wrote:

> Yes, they are in the global scope, and from what I gather: they are just
> regular functions, created by special syntax.
>
> There are a few obvious solutions (some of which you might have thought
> yourself :-):
>  - rename the accessor or the other function, or
>  - put the data declaration or the other function in another module and
> import qualified, or
>  - write a typeclass with a 'name' function and fit the non-accessor
> function 'name' somehow into that...
>
> I think the best approach is the modular one, but this really depends on
> what you are doing.
>
>
Okay looks like name mangling with the datatypes name is in order then.
Something like :-

    data Test
        = Test {
            testName :: String,
            testValue :: Int
        }

Thanks,

Aaron

--
> Markus Läll
>
> On Thu, Dec 30, 2010 at 7:01 PM, Aaron Gray <aaronngray.lists at gmail.com>wrote:
>
>> Given a Haskell "record type" :-
>>
>>     data Test
>>         = Test {
>>             name :: String,
>>             value :: Int
>>         }
>>
>>     test = Test {
>>             name = "test",
>>     value = 1
>>         }
>>
>>     main :: IO ()
>>     main = do
>>         putStrLn (name test)
>>
>> Are "name" and "value" in the global name space, as the following gives an
>> error "Multiple declarations of `name'" :-
>>
>>     name :: String -> String
>>     name s = s
>>
>> Is there any way round this ?
>>
>> Many thanks in advance,
>>
>> Aaron
>>
>>
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>
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