[Haskell-cafe] Is there anyone out there who can translate C# generics into Haskell?

[Bulat Ziganshin]

Hello Mark,

Thursday, January 3, 2008, 2:13:08 PM, you wrote:

of course *some* overlap exists but in order to understand it you
should know exact shape of both methods

when i tried to develop complex library without understanding t.c.
implementation, i constantly goes into the troubles - things that i
(using my OOP experience) considered as possible, was really
impossible in Haskell

so i'm really wonder why you don't want to learn the topic thoroughly


> I loosely do understand....but very loosely....but I'm not, as yet,
> convinced it is completely relevant.

> The implementation may differ, but that does not mean that there is no
> overlap....I am not expecting one model to be a superset of the other,
> but I am expecting some sort of overlap between 'interface'
> implementation and type class instance declaration.


> -----Original Message-----
> From: Bulat Ziganshin [mailto:bulat.ziganshin at gmail.com] 
> Sent: 03 January 2008 10:54
> To: Nicholls, Mark
> Cc: Bulat Ziganshin; haskell-cafe at haskell.org
> Subject: Re[2]: [Haskell-cafe] Is there anyone out there who can
> translate C# generics into Haskell?

> Hello Mark,

> Thursday, January 3, 2008, 1:22:26 PM, you wrote:

> because they have different models. i recommend you to start from
> learning this model, otherwise you will don't understand how Haskell
> really works and erroneously apply your OOP knowledge to Haskell data
> structures.

> shortly said, there are 3 ways to polymorphism:

> 1) C++ templates - type-specific code generated at compile time
> 2) OOP classes - every object carries VMT which allows to select
> type-specific operation
> 3) type classes - dictionary of type-specific operations is given as
> additional hidden argument to each function

> Haskell uses t.c. and its abilities are dictated by this
> implementation. there is no simple and direct mapping between
> features provided by OOP and t.c.


>> Can you give me a summary of why it's meaningless.....both would seem
> to
>> describe/construct values/objects....they may not be equivalent, but I
>> would expect some considerable overlap.

>> -----Original Message-----
>> From: Bulat Ziganshin [mailto:bulat.ziganshin at gmail.com] 
>> Sent: 02 January 2008 20:29
>> To: Nicholls, Mark
>> Cc: haskell-cafe at haskell.org
>> Subject: Re: [Haskell-cafe] Is there anyone out there who can
> translate
>> C# generics into Haskell?

>> Hello Mark,

>> Wednesday, January 2, 2008, 7:40:31 PM, you wrote:

>>> I'm trying to translate some standard C# constucts into Haskell...
>> some

>> it's meaningless. read
>> http://haskell.org/haskellwiki/OOP_vs_type_classes
>> and especially papers mentioned in the References







-- 
Best regards,
 Bulat                            mailto:Bulat.Ziganshin at gmail.com