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Newsgroups: comp.lang.ada
Subject: Re: generic unit : compilation error ! please help me
References: <1140772786.942747.88370@j33g2000cwa.googlegroups.com>
From: Stephen Leake <stephe_on_the_web@toadmail.com>
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Date: Fri, 24 Feb 2006 05:51:14 -0500
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nblanpain@hotmail.com writes:

> hello,
> When i compile the following programm, i have the following error on
> function Set_Unit_To_Test of class "child-test_unit.adb" :
> "14 : invalid tagged conversion, not compatible with type T_Child'Class
> defined at child.ads"
>  I don't undestand this error : please help me !
>
> ## parent.ads ## :

minor point; please use Ada comments for separators like this, so
gnatchop can handle them.

> generic
>    type T_Real is digits <>;
> package Parent is
>    type T_Parent is tagged private;
>    type T_Parent_Access is access all T_Parent;
> private
>    type T_Parent is tagged record
>       Real : T_Real;
>    end record;
> end Parent;

I have not fully sorted out your problem, because I find the names too
confusing. While it is proper to have similar names like this in a
finished product, they do get in the way of finding structural
problems.

So first, do these steps:

1) Get rid of the subtypes; use the full type names. It will make
   things clearer.

2) Name things clearly, without relying on the package name;
   Parent_Class_Access_Type, Child_Class_Access_Type.

I think you have too many class-wide access types. In particular, I
think you are trying to store a parent unit test in an object of type
child unit test. The object probably needs to be of type
Parent_Class_Access.

The clearer names will help you sort out what you really want to do.
Once that is clear, you can change the names back to be more
user-friendly. 

-- 
-- Stephe