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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: operation can be dispatching in only one type
Date: Thu, 26 Nov 2015 14:14:26 +0100
Organization: cbb software GmbH
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Xref: news.eternal-september.org comp.lang.ada:28547
Date: 2015-11-26T14:14:26+01:00
List-Id: <comp.lang.ada>

On Thu, 26 Nov 2015 03:30:09 -0800 (PST), Serge Robyns wrote:

> On Wednesday, 25 November 2015 18:38:53 UTC+1, Dmitry A. Kazakov  wrote:
>> The object is a proxy to a persistent object. It is OK to update the proxy
>> without committing changes to the persistent counterpart. But note that you
>> still want to extend compiler-generated setters. E.g. for marking the proxy
>> object out-of-sync. Thus when a transaction is getting committed the
>> connection handler would store all updated objects.
> 
> Can you please elaborate what you mean by a "compiler-generated" setter? 
> Because from what I do understand from your explanation about marking the
> proxy is something I'm looking for and maybe to far while it's right under
> my nose.

type T is record
   X : Integer;
end record;

The compiler generated setter is something like inventing Ada-like
notation:

   procedure ".X" (Left : in out T; Right : Integer);

Called as follows:

   Y : T;
begin
   Y.X := 10;

If Ada were a better language you could override getters/setters and
provide your own implementation:

   type T is private record -- This is not Ada!
      X : Integer;
   end record;
private
   type T is new DB.Handle with null record; -- No Integer members!
   procedure ".X" (Left : in out T; Right : Integer);
   function ".X" (Left : T) return Integer);
 
P.S. Surely, at some point there would a kludge invented with aspects as it
was done for array indexing...

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