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From: Andre Spiegel <spiegel@berlin.informatik.uni-stuttgart.de>
Subject: Re: Using Controlled type objects.
Date: 1996/08/01
Message-ID: <lhm7mrjoz9f.fsf@berlin.berlin.informatik.uni-stuttgart.de>#1/1
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sender: spiegel@berlin.berlin.informatik.uni-stuttgart.de
references: <32008E75.6A3F@ncl.ac.uk>
organization: University of Stuttgart, Germany
newsgroups: comp.lang.ada
Date: 1996-08-01T00:00:00+00:00
List-Id: <comp.lang.ada>


Andrea Coccoli writes:

> When I compile it, I receive this message:
> genstack.ads:#: controlled type must be declared at the library level 

The problem is that you are trying to instantiate the generic inside
your main procedure -- and hence, the controlled type is not at the
library level.  The error message is a bit misleading, because it is
reported for the declaration within the generic package.  But that one
obviously *is* at the library level.  [I think I've heard rumours that
the GNAT team wants to enhance that error message, maybe they already
did so, are you using the current version of GNAT?]

Anyway, the solution is to instantiate the generic separately, like

    package My_Stack is new Reusable (...)

as a compilation unit on its own, and then "with" that unit into your
main procedure.