Re: (generic) child package of generic package; intantiation of

["Peter Hend�n" <phenden@tdab.com>]

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"Tucker Taft" wrote:
> Unfortunately, Mark, Marc, and Pat all forgot to mention that you
> have to "with" the child unit where you plan to instantiate it.
> The way to think about a "with" clause for a child is that it effectively
> inserts the child into the parent.  With a child of a generic,
> inserting the child into the generic parent means that all instances
> of the generic parent now include the generic child nested within
> them.  You can then instantiate one of those nested generics,
> given any instance of the parent.
What I wound up with was (using gnat 3.13p):
--- GenParent.ads
generic
   ...
package GenParent is
   ...
end GenParent;

--- GenParent-GenChild.ads
generic
package GenParent.GenChild is
   ...
end GenParent.GenChild;

--- InstantiatedParent.ads
with GenParent;

package InstantiatedParent is new GenParent(...);

--- InstantiatedParent - InstantiatedChild.ads
with GenParent.GenChild;         -- have to with the generic child package
(1)

package InstantiatedParent.InstantiatedChild is new
InstantiatedParent.GenChild;
----

(1) Is this what you meant?

Is the above the way to do it? Any better ways?

> But the key thing to remember is that the nested generic is only
> made visible where a "with" clause for the generic child applies.

Grateful for any and all help.

Regards,
Peter

--
Peter Hend�n           http://www.algonet.se/~phenden
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Teknisk Dokumentation AB          http://www.tdab.com