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Exceptions should be "exceptional". That is, you shouldn't expect them to happen during normal functioning of the program. So lets see what the overhead of providing (unused) exception handling is:

use strict; use warnings; use Benchmark 'cmpthese'; cmpthese(-1, { 'eval' => \&eval_code, 'noeval' => \&no_eval_code, }); sub eval_code { my $x = 0; for (reverse 0..9) { eval { some_more_code ($_); }; if ($@) { error_sub(); } } } sub no_eval_code { for (reverse 0..9) { if ($_==0) { error_sub(); } else { some_more_code ($_); } } } sub some_more_code { } sub error_sub { }

Prints:

Rate eval noeval eval 185563/s -- -7% noeval 198639/s 7% --

In words: the processing cost of an unexercised eval is essentially nothing.


DWIM is Perl's answer to Gödel

In reply to Re^2: Nested evals - are they evil? (sample benchmarks) by GrandFather
in thread Nested evals - are they evil? by cLive ;-)

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