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Why are objects slower than procedural subs/data structs?

by Sol-Invictus (Scribe)
on Feb 03, 2004 at 17:50 UTC ( #326269=perlquestion: print w/replies, xml ) Need Help??

Sol-Invictus has asked for the wisdom of the Perl Monks concerning the following question: (object-oriented programming)

what is it that makes objects 20-50% more expensive to use?

Originally posted as a Categorized Question.

  • Comment on Why are objects slower than procedural subs/data structs?

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Re: Why are objects slower than procedural subs/data structs?
by Fletch (Chancellor) on Feb 03, 2004 at 18:16 UTC

    Method dispatch overhead. When you say foo( $a ) whatever foo in the current scope is called dirrectly. When you say $obj->bar( $b ), then perl has to check what $obj is (a scalar holding a blessed ref? a class name), then try and call Whatever::bar, and if that doesn't work try SuperWhatever::bar . . .

    Granted there's some caching done, but it's more than just a simple subroutine call.

Re: Why are objects slower than procedural subs/data structs?
by pajout (Curate) on Nov 08, 2005 at 12:38 UTC

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