Re: Can't export object of private type

["Nick Roberts" <Nick.Roberts@dial.pipex.com>]

I think, possibly, you're missing the point, Don!  Planet_Id is only an
identifier of a planet, not the planet itself.  There is only one instance
of each planet -- kept in terms of variables within (the body of) each
planet package -- and the corresponding Planet_Id simply gives access to the
planet.  It's just like having a single object with potentially many access
values pointing to it; I'm just using integers (type Planet_Id) instead of
access values.

Again, you must not confuse design with implementation: I'm using packages
here instead of types, and integers instead of access values.  But these are
mere implementational details, and nothing to do with the design.  The
design is: single objects (the planet packages); polymorphic access to them
(via planet ids and the package Dynamic_Planet).  The 'objects' in our
design do not have to be objects in implementation (we use packages
instead); the 'access' values in our design do not have to be access values
in our implementation (we use integers instead).

Or is it me who is missing the missing the point? :-)

Hope this clarifies things.

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Nick Roberts
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