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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Publishing selected entries in a protected object?
Date: Thu, 9 Feb 2012 14:42:19 +0100
Organization: cbb software GmbH
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References: <87wr7wkyp5.fsf@adaheads.sparre-andersen.dk>
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Date: 2012-02-09T14:42:19+01:00
List-Id: <comp.lang.ada>

On Thu, 09 Feb 2012 12:56:06 +0100, Jacob Sparre Andersen wrote:

> I have a package containing a protected object, and I would like to
> publish _one_ of this object's entries in the specification of the
> package.
> 
> Since I want to be able to use the entry in a select statement, I can't
> just encapsulate it in a procedure and make that available in the
> package specification.
> 
> And if I move the declaration of the protected object to the package
> specification, but move the other entries to the private part of the
> protected object, I can't access the other entries from the private part
> of my package.
> 
> Is there a pattern I can use?

Not exactly, but ...

   type I is protected interface;
   procedure A (X : in out I) is abstract;

   protected type Foo is new I with
      overriding entry A; -- "Public entry"
      entry B; -- "Private entry"
   end Foo;

Now, if only the interface I is visible, then that would be close to what
you wanted.

P.S. Alas, but the following is illegal:

   [protected] type Foo is new I with private;
private
   protected type Foo is new I with ... end Foo;

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de