Michael Hobbs writes:
> I have been "scratching a personal itch" lately and was wondering if
> anyone else has the same itch. [...]
>
> [...] it is not possible to create a list of values that may be of
> different [Haskell] type, but all implement the same interface.
>
> [...]
Hi.
Is i
Tom Pledger wrote:
> Is it common OO programming practice to cast the elements of a
> same-interface-different-implementation list, so as to recover the
> original objects in full detail?
Hmm, that's a bit of gray area, I think. Conceptually speaking, if a
function is given a list of Shapes, it s
> Many people have said this, but I still haven't found an instance where
> existential types are *needed*. For example, if you declare a data type:
How about this? Is the following example possibly accepted in any extended
Haskell system?
class Sequence seq a where
empty :: seq a
cons :
Jaewoo Kim wrote:
>
> > Many people have said this, but I still haven't found an instance where
> > existential types are *needed*. For example, if you declare a data type:
>
> How about this? Is the following example possibly accepted in any extended
> Haskell system?
>
> class Sequence seq a
Fergus Henderson wrote:
> On 27-Aug-1999, Michael Hobbs <[EMAIL PROTECTED]> wrote:
> > Those who are into the more esoteric aspects of OO know that an object
> > has both a "type" (interface) and a "class" (implementation).
>
> Yes, but of course Haskell uses those two words in the opposite sense
On 27-Aug-1999, Michael Hobbs <[EMAIL PROTECTED]> wrote:
> Those who are into the more esoteric aspects of OO know that an object
> has both a "type" (interface) and a "class" (implementation).
Yes, but of course Haskell uses those two words in the opposite sense!
In Haskell, a class specifies th
On Fri, 27 Aug 1999, Martin Norb{ck wrote:
> Fri Aug 27 1999, Michael Hobbs ->
> > But to reiterate the point of this message, would anybody be interested
> > in a preprocessor that reads in some sort of class/interface definition
> > and spits out standard Haskell code, which uses the convention
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Fri Aug 27 1999, Michael Hobbs ->
> But to reiterate the point of this message, would anybody be interested
> in a preprocessor that reads in some sort of class/interface definition
> and sp
Martin Norb{ck wrote:
> Have you looked at Haskell++?
> http://www.cs.chalmers.se/~rjmh/Software/h++.html
Wasn't aware of its existence. Thanks for the pointer. I'll be sure to
look into it.
- Michael Hobbs
I have been "scratching a personal itch" lately and was wondering if
anyone else has the same itch. If so, I might spend some time to codify
a sort of preprocessor that produces a more OO Haskell. Right now I'm
doing all of the transformations by hand, instead of relying on an
automated tool.
Som
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