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Re: Exception Classes Advice on Subclasses

by halley (Prior)
on Dec 21, 2005 at 17:25 UTC ( #518361=note: print w/replies, xml ) Need Help??

in reply to Exception Classes Advice on Subclasses

In Java and C++, exceptions are typically instances of some class, and are "thrown" by bad code and caught in surrounding "try/catch" syntax.

While some people have built these elaborate synonymous structures using Perl packages, I have found very little advantage in them over using Perl's built-in exception mechanism.

In Perl, exceptions are a scalar value, stored in the special variable $@. These exceptions are "thrown" by bad code using the keyword die and caught in surrounding code by eval { } syntax.

The advantages of classes appears to be when there are so many possible causes of failure that you need to send back uber-complex reporting structures to attempt to explain it. If you don't need all this complexity (and you should always avoid undue complexity), just use die/eval.

Write Perl in Perl idioms using Perl's mechanisms. Otherwise you're just coding in Java or C++, but sprinkled with funny sigils.

[ e d @ h a l l e y . c c ]

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Re^2: Exception Classes Advice on Subclasses
by BrowserUk (Patriarch) on Dec 21, 2005 at 18:22 UTC
    Write Perl in Perl idioms using Perl's mechanisms.

    Yes. Yes. YES!

    That should be added to the Monk's quips and displayed on every page of this site.

    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.

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