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From: Lutz Donnerhacke <lutz@iks-jena.de>
Newsgroups: comp.lang.ada
Subject: Re: Abstract methods in ADA95
Date: Thu, 17 Oct 2002 14:39:55 +0000 (UTC)
Organization: IKS GmbH Jena
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Xref: archiver1.google.com comp.lang.ada:29871
Date: 2002-10-17T14:39:55+00:00
List-Id: <comp.lang.ada>

* Hector Hugo wrote:
> Hello, i'm new programing in Ada95, i come from C++ world and i've got
> problems when i try to use abstract methods in Ada95. I'm trying to do
> something similar to this but in Ada95:
> 
> class Abstract_Class
> {
> public:
>    virtual void Abstract_Method () = 0;  // C++ abstract method.
>  
>    ...
> };

  type Abstract_Class is abstract tagged record ...;
  procedure Abstract_Method (a : Abstract_Class) is abstact;

> class Son_Class: public Abstract_Class   // C++ tagged type extension.
> {
>    void Abstract_Method ();
> 
>    ...
> };

  type Son_Class is new Abstract_Class with record ...;
  procedure Abstract_Method (a : Son_Class);

> void main ()
> {
>    Abstract_Class* p_abstract = new Son_Class;
> 
>    p_abstract->Abstract_Method ();
> }

  procedure main is
     concrete : Abstract_Class'Class := Son_Class'(null record);
  begin
     Abstract_Method(concrete);
  end main;