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From: user@domain.invalid
Newsgroups: comp.lang.ada
Subject: problems with generic package
Date: Wed, 29 May 2002 11:08:41 +0200
Organization: Conservatoire National des Arts et Metiers
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Date: 2002-05-29T09:09:42+00:00
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good morning

i have declared a generic package generic_set with the following 
specification:


generic
    type Element is private;

package Generic_Set is
...
end package;



then in another package i introduced a tagged type with two derived 
types like this:


type node is tagged null record;
type place is new node with record ... end record;
type transition is new node with record ... end record;


how is it possible to declare a new package set over the node type?
this declaration doesn't work :

package nodes_set is new generic_set(element => node'class);

error:

instantiation error
unconstrained subtype in component declaration
actual for "Element" must be a definite subtype


thanks for any help