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

30 Dec 2010


      On 30 December 2010 17:23, Markus Läll  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 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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