From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM autolearn=unavailable autolearn_force=no version=3.4.4 X-Received: by 10.182.142.37 with SMTP id rt5mr13746419obb.47.1428479073932; Wed, 08 Apr 2015 00:44:33 -0700 (PDT) X-Received: by 10.140.20.40 with SMTP id 37mr200138qgi.26.1428479073901; Wed, 08 Apr 2015 00:44:33 -0700 (PDT) Path: border2.nntp.dca1.giganews.com!nntp.giganews.com!l13no2391254iga.0!news-out.google.com!k20ni36qgd.0!nntp.google.com!z60no275544qgd.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail Newsgroups: comp.lang.ada Date: Wed, 8 Apr 2015 00:44:33 -0700 (PDT) In-Reply-To: <1miph3v72f4y2$.1u76w2ujg74zf$.dlg@40tude.net> Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=185.30.133.97; posting-account=hya6vwoAAADTA0O27Aq3u6Su3lQKpSMz NNTP-Posting-Host: 185.30.133.97 References: <44b2e375-8993-4a7e-b81a-6a7b512d2e3e@googlegroups.com> <1miph3v72f4y2$.1u76w2ujg74zf$.dlg@40tude.net> User-Agent: G2/1.0 MIME-Version: 1.0 Message-ID: Subject: Re: BDD package in Ada. From: Vincent DIEMUNSCH Injection-Date: Wed, 08 Apr 2015 07:44:33 +0000 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Xref: number.nntp.giganews.com comp.lang.ada:192771 Date: 2015-04-08T00:44:33-07:00 List-Id: Le mercredi 8 avril 2015 08:38:19 UTC+2, Dmitry A. Kazakov a =E9crit=A0: =20 > I would not call it "fundamental". It is simply a tree with factored out > subtrees. Need not to be binary, BTW. A BINARY decision diagram needs to be binary, by definition. It is not "sim= ply" a tree, but a highly optimised data structure, not only by factoring t= he tree, but through variable ordering, which is the key idea. (Briant's pa= per is about ORDERED=A0BDD). It is usefull for the implementation of Sets a= nd operations on sets.=20 =20 > Of course there exist Ada implementations. I have one in Ada > http://www.dmitry-kazakov.de/ada/fuzzy_ml_api.htm#Fuzzy.Graph > with binary and general case nodes. I see a general object oriented frame for creating graphs... Very different= from a Reduced Ordered Binary Decision Diagram Library. > I don't think structures like trees and directed graphs could be packed i= n > a library. Each application of graphs is very specific. The abstraction > level is too low to make it a decent container. Memory management is alwa= ys > different. Operations are always different. The impact of the > representation is so huge that different application almost always requir= e > a different implementation. I agree. And this is why I need a Library carefully optimised for the speci= al case of ROBDD. Regards, Vincent