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Re^2: elsif chain vs. dispatch

by ruzam (Curate)
on Apr 27, 2009 at 02:40 UTC ( #760239=note: print w/ replies, xml ) Need Help??

in reply to Re: elsif chain vs. dispatch
in thread elsif chain vs. dispatch

$y could be passed as a reference to avoid the string copy further reduce the disadvantage, particularly for large strings.

my %dispatch=( A=>sub { split(/!/,$$_[0]); }, ... ); sub dispatch { my $x=$letters[random($nLetters)]; my $y='xyzzy!' x random(1000); if (exists $dispatch{$x}) { $dispatch{$x}->(\$y); } else { warn "Huh?"; } }

On the other hand, maybe the parameter string isn't copied when the function references $_[0] directly?

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Re^3: elsif chain vs. dispatch
by almut (Canon) on Apr 27, 2009 at 02:53 UTC

    I had tried that.  And had first made the same mistake (and thus got a speed boost of around 800% :) —> the $$_[0] would need to be ${$_[0]}. With that fixed, there's virtually no difference...   In other words, the string isn't copied, even without using references ($_[0] is an alias).

      Interesting. Now I've got some code to review that may stand for another tweak or two :)

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