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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Ada.Containers.Doubly_Linked_Lists
References: <mailman.69.1170624131.18371.comp.lang.ada@ada-france.org>
	<45c6500f$0$22528$39db0f71@news.song.fi>
Date: Sun, 04 Feb 2007 23:08:34 +0100
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Date: 2007-02-04T23:08:34+01:00
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Niklas Holsti <niklas.holsti@nospam.please> writes:

> Carroll, Andrew wrote:
>> Ahhhhh, I see.
>
> (Please quote a bit of the post to which you are replying so that the
> context of your "Ahhhhh" is clearer :-)
>
>> Okay, so, just out of curiosity, what do I do if I need the
>> Node_type within Ada.Containers.Doubly_Linked_Lists to
>> have an additional "attribute"?
>
> What Node_Type? Are you peeking at the *private* part of
> Ada.Containers.Doubly_Linked_Lists, or even at the source-code of the
> body of the generic? That's useless because you can't access the
> private stuff or the stuff in the body.
>
> Whatever you want to keep in your list, put it in your Element_Type,
> the type that you use to instantiate Doubly_Linked_Lists. For example,
> make it a record type and put in whatever components you need.

And, if Niklas' answer was unclear, do not add Prev or Next to your
Element_Type; it is the generic linked list's job to add and manage
them.  If all you want is an unbounded string, just say

package Lists_Of_Unbouned_Strings is
   new Ada.Containers.Doubly_Linked_Lists
     (Element_Type => Ada.Strings.Unbounded.Unbounded_Strings);

L : Lists_Of_Unbouned_Strings.List;

and off you go.

-- 
Ludovic Brenta.