From: porton@ex-code.com (Victor Porton)
Subject: Re: Problem Eliminating constructors
Date: Tue, 21 Jan 2003 02:07:29 +0500
Date: 2003-01-20T21:14:15+00:00 [thread overview]
Message-ID: <3e2c66a7$0$33929$bed64819@news.gradwell.net> (raw)
In-Reply-To: 3e274cad$0$33929$bed64819@news.gradwell.net
In article <3E2BDFD8.4070805@epfl.ch>,
Rodrigo Garc�a <rodrigo.garcia@epfl.ch> writes:
> Victor Porton wrote:
>> package A is
>>
>> type A_Type is tagged
>> record
>> X: Integer;
>> end;
>>
>> function Create(X: Integer) return A_Type; -- guess what is the body
>>
>> end A;
>>
>> Then I have
>>
>> type B_Type is new A.A_Type with
>> record
>> Y: Integer;
>> end;
>>
>> Compiler requires me to override Create as the return type changes.
>> But it is meaningless as now I need Create with two parameters
>> instead of one.
>>
>> What to do?
>
> You do not need a constructor for this simple case. This will create
> an A_Type object and initialize X to value 5.
>
> declare
> My_A : A.A_Type := (X => 5);
[skip]
Oh, Rodrigo, I oversimplified the real situation. Initialization with
just aggregates is possible only in the example, really I need namely
constructor functions.
Well, currently I switched to initialization by calling a procedure.
It would be nice if Ada0X would allow to make a primitive operation
non-virtual.
E.g. we can introduce "pragma Freeze(TYPE)".
next prev parent reply other threads:[~2003-01-20 21:07 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-17 0:19 Problem Eliminating constructors Victor Porton
2003-01-17 15:21 ` John English
2003-01-17 21:10 ` Victor Porton
2003-01-18 15:19 ` Simon Wright
2003-01-20 11:39 ` Rodrigo García
2003-01-20 21:07 ` Victor Porton [this message]
2003-01-21 9:44 ` Dmitry A. Kazakov
2003-01-21 19:01 ` Martin Krischik
2003-01-21 11:43 ` Rodrigo García
2003-01-21 15:03 ` Stephen Leake
2003-01-21 13:09 ` Victor Porton
2003-01-22 15:26 ` Rodrigo García
2003-01-21 18:38 ` Victor Porton
2003-01-23 17:08 ` Stephen Leake
-- strict thread matches above, loose matches on Subject: below --
2003-01-17 6:54 Grein, Christoph
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