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NNTP-Posting-Date: Tue, 06 Sep 2005 13:13:40 -0500
From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: children unity
References: <1126025898.866369.318320@g47g2000cwa.googlegroups.com>
Date: Tue, 06 Sep 2005 20:14:05 +0200
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Date: 2005-09-06T20:14:05+02:00
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"nicolas.b" <nicolas.blanpain@fr.thalesgroup.com> writes:
> this is an example :
>
> generic
>    type Toto is private;
> package Father is
> ...
> end Father;
>
> generic
>    type Titi is private;
> procedure Father.Children (...);
>
> My question : How can i use the children unity Father.Children ?
> package Inst_Father is new Father (Toto => ...);
> procedure Inst_Children is new Father.Children (Titi => ...); --

procedure Inst_Children is new Inst_Father.Children (Titi => ...);

> compilation error ???
>
> can you explain me,

A child unit cannot be the child of a generic, because the generic
does not exist in the executable program.  Instead, you can have
children of real units which are instances of a generic.

Corollary: any child of a generic unit must also be declared generic,
e.g.

generic
   ...
package P is ...
end P;

generic -- required even if no parameters
package P.Q is
   ...
end P.Q;

HTH

-- 
Ludovic Brenta.