* Re: Lists
[not found] <003b01bf92ac$6c14dcc0$97c2f4d8@andrs>
@ 2000-03-22 0:00 ` John English
2000-03-23 0:00 ` Lists Ehud Lamm
2000-03-30 0:00 ` Multiprecisions numbers in ada DELCOURT J�r�me
1 sibling, 1 reply; 4+ messages in thread
From: John English @ 2000-03-22 0:00 UTC (permalink / raw)
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.
-----------------------------------------------------------------
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
-----------------------------------------------------------------
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: Lists
2000-03-22 0:00 ` Lists John English
@ 2000-03-23 0:00 ` Ehud Lamm
0 siblings, 0 replies; 4+ messages in thread
From: Ehud Lamm @ 2000-03-23 0:00 UTC (permalink / raw)
|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
Check it out and subscribe to the E-List- for interesting essays and more!
^ permalink raw reply [flat|nested] 4+ messages in thread
* Multiprecisions numbers in ada
[not found] <003b01bf92ac$6c14dcc0$97c2f4d8@andrs>
2000-03-22 0:00 ` Lists John English
@ 2000-03-30 0:00 ` DELCOURT J�r�me
2000-03-31 0:00 ` DELCOURT J�r�me
1 sibling, 1 reply; 4+ messages in thread
From: DELCOURT J�r�me @ 2000-03-30 0:00 UTC (permalink / raw)
To: comp.lang.ada
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
^ permalink raw reply [flat|nested] 4+ messages in thread
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2000-03-22 0:00 ` Lists John English
2000-03-23 0:00 ` Lists Ehud Lamm
2000-03-30 0:00 ` Multiprecisions numbers in ada DELCOURT J�r�me
2000-03-31 0:00 ` DELCOURT J�r�me
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