Re: Lists

Re: Lists

[John English]

Fortier Andres wrote:
> Hi,
>     I need to make a package that contains a sort of heterogeneous list.
> This is the deal:
>                         There is a hierarchy of objects, and all of them are
> subclasses of Object. I need the list to be able to hold any object of that
> hierarchy, but the idea is not to have to instantiate a package for every
> type the list is going to hold.
> Any idea?

What you need is a list of pointers (whoops, access types :-) to
Object'Class objects. Or put a pointer to Object'Class in every
Object, and have operations to add an Object to a list, then
derive from Object as required. A list of pointers is easier
and more general IMHO.

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 John English              | mailto:je@brighton.ac.uk
 Senior Lecturer           | http://www.it.bton.ac.uk/staff/je
 Dept. of Computing        | ** NON-PROFIT CD FOR CS STUDENTS **
 University of Brighton    |    -- see http://burks.bton.ac.uk
-----------------------------------------------------------------

Re: Lists

[Ehud Lamm]

|Fortier Andres wrote:
|> Hi,
|>     I need to make a package that contains a sort of heterogeneous list.
|> This is the deal:
|>                         There is a hierarchy of objects, and all of them are
|> subclasses of Object. I need the list to be able to hold any object of that
|> hierarchy, but the idea is not to have to instantiate a package for every
|> type the list is going to hold.
|> Any idea?
|

I think the "simple polymorphic list" example 9on my site, and on
adapower) shows how to do this.

Ehud Lamm mslamm@mscc.huji.ac.il
http://purl.oclc.org/NET/ehudlamm <== My home on the web 
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Multiprecisions numbers in ada

[DELCOURT J�r�me]

Hi!


I am Jerome Delcourt, and I have just created a site dedicated to
multiprecisions numbers in ada. There are some packages available at
http://www.chez.com/bignumber


Sincerely,


Jerome Delcourt

Re: Multiprecisions numbers in ada

[DELCOURT J�r�me]

DELCOURT J�r�me wrote:
> 
> Hi!
> 
> I am Jerome Delcourt, and I have just created a site dedicated to
> multiprecisions numbers in ada. There are some packages available at
> http://www.chez.com/bignumber
> 
> Sincerely,
> 
> Jerome Delcourt

If you have any problem to access to this site, there is a mirror
at http://www.crosswinds.net/~bignumbers/


Sincerely,


Jerome Delcourt