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Date: Wed, 10 May 2006 21:01:08 +0200
From: Georg Bauhaus <bauhaus@futureapps.de>
Organization: future apps GmbH
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Newsgroups: comp.lang.ada
Subject: Re: Instantiating private types with discriminants?
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Date: 2006-05-10T21:00:57+02:00
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rick H wrote:

> I've now tried declaring Var_A to be...
>    Var_A : General_T'Class;
> 
> but gnat insists on initialization, and it's here that I tumble.

A real object of a class-wide type needs to have a tag,
hence if you don't initialize, which tag should it be?
Solution:
Declare variables or constants where you need them,
and where you have assembled everything necessary for their
initialization. That is,

procedure simple_case is
   ...
begin
   ...
   declare
      var_x: General_T'class := <your initialization here>;
   begin
      op(var_x);
   end;
   ...
end simple_case;