From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Why constant components are not permitted ?
Date: Sat, 26 Nov 2011 11:59:26 +0100
Date: 2011-11-26T11:59:26+01:00 [thread overview]
Message-ID: <11tnq3hinw2vk.14uei46b2un4l$.dlg@40tude.net> (raw)
In-Reply-To: 4ED0BDEB.9030002@obry.net
On Sat, 26 Nov 2011 11:22:35 +0100, Pascal Obry wrote:
> Le 25/11/2011 11:06, AdaMagica a �crit :
>> Useful applications for constant components could be (this is what you
>> can have in C++):
>>
>> record -- *not* Ada
>> Name: constant String := "James Bond";
>> Id : constant Positive := 007; -- e.g employee number of a company
>> other variable components
>> end record;
>>
>> In Ada, you hide the components (private record), define a constructor
>> function providing the values for the constant items and provide only
>> read operations for them.
>
> But why on earth do you want a field in a record with the same value for
> all objects of this type?
record -- This is not Ada!
Name : constant Unbounded_String := Read (File);
Of course it should be possible to initialize constant fields upon object
construction:
record -- This is not Ada!
Name : constant Unbounded_String; -- Deferred until construction
Also don't forget constant views of fields which are privately
non-constant.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2011-11-26 10:59 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-24 18:14 Why constant components are not permitted ? David Sauvage
2011-11-24 19:06 ` anon
2011-11-24 19:49 ` David Sauvage
2011-11-24 22:55 ` Georg Bauhaus
2011-11-24 23:53 ` anon
2011-11-24 19:46 ` Ludovic Brenta
2011-11-25 9:10 ` Dmitry A. Kazakov
2011-11-25 10:23 ` Ludovic Brenta
2011-11-25 10:45 ` Dmitry A. Kazakov
2011-11-25 6:56 ` Niklas Holsti
2011-11-25 9:53 ` Yannick Duchêne (Hibou57)
2011-11-25 10:06 ` AdaMagica
2011-11-25 10:16 ` AdaMagica
2011-11-25 10:56 ` Yannick Duchêne (Hibou57)
2011-11-25 17:41 ` Niklas Holsti
2011-11-26 0:23 ` anon
2011-11-29 4:10 ` Randy Brukardt
2011-11-29 7:55 ` David Sauvage
2011-11-29 10:55 ` Yannick Duchêne (Hibou57)
2011-11-29 11:17 ` Mark Lorenzen
2011-11-26 10:22 ` Pascal Obry
2011-11-26 10:59 ` Dmitry A. Kazakov [this message]
2011-11-25 7:03 ` AdaMagica
2011-11-25 9:12 ` Dmitry A. Kazakov
2011-11-25 9:57 ` Yannick Duchêne (Hibou57)
2011-11-25 10:22 ` Dmitry A. Kazakov
2011-11-25 11:00 ` Yannick Duchêne (Hibou57)
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