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Re: Need a test for deep equality

by Corion (Patriarch)
on Apr 20, 2002 at 10:59 UTC ( #160766=note: print w/replies, xml ) Need Help??


in reply to Need a test for deep equality

While implementing my module File::Modified (nee File::Dependencies - not yet on CPAN), I also wanted such a deep comparision method, but I didn't find one either (in Python, this would be as easy as struct_a == struct_b :-)). But I would prefer basing the thing on Data::Dumper or another existing wheel, as cyclic structures are a nasty thing to handle. On the problem of hash order, it would make sense to do a sort() on the keys of the hashes before writing them out, so that identical hashes produce identical strings - maybe that would be just a small patch to Data::Dumper.

Update : Of course, somebody already invented this wheel, in Test::More by Michael Schwern. There is the routine is_deeply, which does a deep compare - maybe this would warrant extraction in its own module...

perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ; # The $d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider ($c = $d->accept())->get_request(); $c->send_response( new #in the HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' # web

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Re: Re: Need a test for deep equality
by demerphq (Chancellor) on Apr 26, 2002 at 16:08 UTC
    maybe that would be just a small patch to Data::Dumper.

    Perhaps, but somehow I doubt it'll happen. First off you would have to do it twice, once in C and once in perl. Second off Data::Dumper is optimized for speed and the overhead of sorting, especially a tied structure, could get prohibitive. OTOH Data::BFDump does sort its keys, and IIRC so does Data::Dump.

    Yves / DeMerphq
    ---
    Writing a good benchmark isnt as easy as it might look.

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