Dynamic Dispatch Example

Dynamic Dispatch Example

[Cameron McAllister]

Anyone have an Ada example of dynamic dispatching.

i.e. one function that is different for a type and all its subtypes

getting REally wierd errors, just need to check the dynamic dispatch.

ta

cameron mcallister

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Re: Dynamic Dispatch Example

[David C. Hoos, Sr.]

Cameron McAllister <s369539@student.uq.edu.au> wrote in message
news:Pine.OSF.4.10.9906031352450.27920-100000@student.uq.edu.au...
> Anyone have an Ada example of dynamic dispatching.
>
> i.e. one function that is different for a type and all its subtypes
>
> getting REally wierd errors, just need to check the dynamic dispatch.
>
look at the small demo application at
ftp://ada95.com/pub/pet_store.tgz
or  ftp://ada95.com/pub/pet_store.tar.gz

The two files are identical (hard-linked) because Windows isn't
friendly to the .tar.gz extension, and Netscape on UNIX isn't
friendly to .tgz extension.

The type hierarchy has an abstract type at the root of the class,
then another abstract derived type, and then concrete (i.e., non-
abstract) derived types.

There is an example of an abstract function which must be
overridden for each concrete derived type, and an example of a
classwide function which is the same for all types derived from
the root type.

I hope this example helps.

Re: Dynamic Dispatch Example

[Ehud Lamm]

My home page a has an example of a simple polymorphic linked list which
shows the use of dispatching among other Ada OO features. 
The example is also in the Ada Source Code Treasury (aka AdaPower).
I also suggest checking out the ada Rational (section II chapter 4) for
many useful examples.

Ehud Lamm     mslamm@pluto.mscc.huji.ac.il
http://www2.cybercities.com/e/ehud     <= Misc. Me
http://www2.cybercities.com/e/ehud/ada <= Misc. Ada stuff

Re: Dynamic Dispatch Example

[David C. Hoos, Sr.]

Brian Orpin wrote in message <375988c5.24607669@news.geccs.gecm.com>...
<snip>
>As an aside if you ever have a problem with this in Windows then rename
>the file from xxxx_tar.gz (the name given on download) to xxxxx.tar.gz
>after download and Winzip will open the file fine.

The reason I hard link to both file extensions is because when your browser
is set up to automatically invoke WinZip (i.e., before you get a chance to
rename)
WinZip gets confused.  Then one has to go chasing for the cached file and
rename it.  Otherwise you have to give up the convenience of having the
browser automatically invoke WinZip.

My modus operandi just makes life easier for the downloader, at minimal disk
space cost to the website, or FTP site.

Re: Dynamic Dispatch Example

[David Botton]

The example is at:

Ada Algorithm Related Examples
http://www.adapower.com/alg

David Botton


Ehud Lamm wrote:
> 
> My home page a has an example of a simple polymorphic linked list which
> shows the use of dispatching among other Ada OO features.
> The example is also in the Ada Source Code Treasury (aka AdaPower).
> I also suggest checking out the ada Rational (section II chapter 4) for
> many useful examples.
> 
> Ehud Lamm     mslamm@pluto.mscc.huji.ac.il
> http://www2.cybercities.com/e/ehud     <= Misc. Me
> http://www2.cybercities.com/e/ehud/ada <= Misc. Ada stuff