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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Standard Set types don't support a feature
Date: Thu, 16 Nov 2017 18:28:47 -0600
Organization: JSA Research & Innovation
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Date: 2017-11-16T18:28:47-06:00
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"Victor Porton" <porton@narod.ru> wrote in message 
news:ot53hk$10bc$1@gioia.aioe.org...
> Dmitry A. Kazakov wrote:
...
>> Any directed graph is a set of pairs.
>
> I mean that I want to use a Set container not some other kind of 
> containers
> (not e.g. a matrix).
>
...
>> Graph is not a container, not in the sense an array or matrix is.
>
> Graph contains a set of vertices and a set of edges. It may be said that
> graph is two containers :-)

The container example in the RM (subclause A.18.32) implements (in part) a 
directed graph. Perhaps you can get some ideas from that???

                                                        Randy.