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

[Nicholls, Mark]

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