Private with -- what for?

Private with -- what for?

[Rick]

Hi folks

I was just looking at
 http://en.wikibooks.org/wiki/Ada_Programming/Packages
and the concept of "private with ..."

There must be some advantage in using it, but I cannot imagine what
that could be.  Can someone enlighten me?

Thanks

Re: Private with -- what for?

[John B. Matthews]

In article 
<fe7542ee-1ad4-4019-bf4f-c541cefe13a1@a11g2000pro.googlegroups.com>,
 Rick <rickduley@gmail.com> wrote:

> I was just looking at
>  http://en.wikibooks.org/wiki/Ada_Programming/Packages
> and the concept of "private with ..."
> 
> There must be some advantage in using it, but I cannot imagine what
> that could be.  Can someone enlighten me?

"Then there is _private_with_ to make a package only visible inside the 
private part of the specification." [1] There's an informative discussion 
in the "Rationale for Ada 2005." [2]

[1]<http://en.wikibooks.org/wiki/Ada_Programming/Ada_2005>
[2]<http://www.adaic.org/resources/add_content/standards/05rat/html/Rat-1-3-3.html>

-- 
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>

Re: Private with -- what for?

[Adam Beneschan]

On Feb 16, 3:48 pm, Rick <rickdu...@gmail.com> wrote:
> Hi folks
>
> I was just looking at
>  http://en.wikibooks.org/wiki/Ada_Programming/Packages
> and the concept of "private with ..."
>
> There must be some advantage in using it, but I cannot imagine what
> that could be.  Can someone enlighten me?

It's needed in some cases where you want the private part to have
access to a private child package.

You might want to check out the discussion at

http://www.ada-auth.org/cgi-bin/cvsweb.cgi/ais/ai-00262.txt?rev=1.24

which pointed out some other benefits as well.

                         -- Adam