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From: "Adam Beneschan" <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: how to import a package
Date: 5 Dec 2006 19:06:04 -0800
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Date: 2006-12-05T19:06:04-08:00
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markww wrote:
> Hi,
>
> I have this snippet of code (from members here) which defines a generic
> type:
>
>     generic
>     type T is private;
>         package P is
>     type Node;
>     type Node_Ptr is access Node;
>         type Node is record
>             Data     : T;
>             Prev_Rec : access Node; -- points to the next record or
> null if none exists.
>             Next_Rec : access Node; -- points to the previous record or
> null if none exists.
>         end record;
>     end P;
>
> Now my compiler (gnat) complains that Node, and Node_Ptr are not seen
> by the rest of the application. Is this because they are scoped within
> package P?
>
> If so, how do I 'import' the package? Right now I just stuck this at
> the start of my main procedure:

P is a generic package so you have to instantiate it.  Something like:

   package Person_List is new P (T => Person_Rec);

Now, Node and Node_Ptr are visible within Person_List, and the "Data"
field in Person_List.Node will have type Person_Rec.

There's no such thing as a "generic type" in Ada.

                -- Adam