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From: mark.biggar@trustedsyslabs.com
Newsgroups: comp.lang.ada
Subject: Re: (generic) child package of generic package; intantiation of
Date: Mon, 29 Jan 2001 17:24:24 GMT
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Date: 2001-01-29T17:24:24+00:00
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In article <LUgd6.9728$Qb7.1473404@newsb.telia.net>,
  "Peter Hend�n" <phenden@tdab.com> wrote:
> I have the following:
>
> generic
>     Count : in Natural := 1;
> package Parent is
>     ...
> end Parent;
>
> generic
> package Parent.RarelyUsedOps is
>     ...
> end Parent.RarelyUsedOps;
>
> I have no problem instantiating Parent, of course, but how in the name
of Ms
> Lovelace do I instantiate the child package?

with Parent;
package p is new Parent;

with P.RarelyUsedOps;
package P.R is new P.RarelyUsedOps;

When you instantiate a generic package that has generic children
the newly created package automaticaly gets partialy instantiated
generic children that correspond to the generic children of the
original generic package.  In a lot of way the children of a package
work as if they were directly imbeded in the parent package.  If
you example instead was:

generic
     Count : in Natural := 1;
package Parent is
     ...

generic
package Parent.RarelyUsedOps is
    ...
end Parent.RarelyUsedOps;

     ...

end Parent;

Then you could used a similar set of instantiations:

with Parent;
package P is new Parent;

with P;
package R is new P.RarelyUsedOps;

Note that in both cases you instantiate a child/sub-package of the
newly instantiated package not of the original generic parent package.

--
Mark Biggar
mark.biggar@trustedsyslabsl.com



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