From: Georg Bauhaus <rm-host.bauhaus@maps.futureapps.de>
Subject: Re: Object-Oriented style question
Date: Tue, 10 Jan 2012 00:58:39 +0100
Date: 2012-01-10T00:58:35+01:00 [thread overview]
Message-ID: <4f0b7f2b$0$7617$9b4e6d93@newsspool1.arcor-online.net> (raw)
In-Reply-To: <11047e9f-a7ef-4728-8e1c-4202c5958e9c@ck5g2000vbb.googlegroups.com>
On 1/9/12 9:55 AM, Maciej Sobczak wrote:
> But I think that in one particular case you might want to distinguish
> between these profiles - access value is a "name" of the object, not
> the object itself, and therefore can be used for more involved lookup.
> Like in a dictionary, where access values are lightweight keys.
> Then, the real meaning of Info_3 would be "tell me what you know about
> the object whose name is this-or-that", using perhaps multiple
> dictionaries (or should I say "caches"?) or complicating this idea in
> any other way you like.
Wouldn't the following lookup function handle the situation?
function Lookup (Table : Dictionaries.Map;
Object : T'Class) return Boolean is
begin
return Table.Contains (Object'Unchecked_Access);
end Lookup;
Object denotes an object, then, so no nulls. Therefore, passing
the result of 'Unchecked_Access to function "Contains" should
be safe in the sense that Contains always gets a meaningful
access value to be used as a key.
The effect is that there still wouldn't be any parameters of an
anonymous access-to-object type at the level of T's definition.
next prev parent reply other threads:[~2012-01-09 23:58 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-08 12:45 Object-Oriented style question Georg Bauhaus
2012-01-08 12:52 ` Simon Wright
2012-01-08 13:25 ` Dmitry A. Kazakov
2012-01-08 14:18 ` Robert A Duff
2012-01-08 20:32 ` Martin Dowie
2012-01-08 20:52 ` Robert A Duff
2012-01-09 22:34 ` Adam Beneschan
2012-01-09 23:21 ` Robert A Duff
2012-01-10 8:34 ` Dmitry A. Kazakov
2012-01-09 8:55 ` Maciej Sobczak
2012-01-09 23:58 ` Georg Bauhaus [this message]
2012-01-10 8:47 ` Maciej Sobczak
2012-01-10 10:27 ` Dmitry A. Kazakov
2012-01-10 12:27 ` Georg Bauhaus
2012-01-11 8:54 ` Maciej Sobczak
2012-01-10 21:26 ` Randy Brukardt
2012-02-08 12:23 ` Yannick Duchêne (Hibou57)
2012-02-08 12:39 ` Yannick Duchêne (Hibou57)
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