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(elbie 2): What does this warning mean?

by elbie (Deacon)
on Aug 17, 2001 at 18:26 UTC ( #105680=note: print w/ replies, xml ) Need Help??


in reply to Re: (elbie): What does this warning mean?
in thread What does this warning mean?

I was unaware that one could run into problems using the object orientet syntax. I went and looked in the Perl Cookbook, but all I saw was a line that recommended the "procedural farmat for casual use", but it didn't really give me much of a reason for it.

I don't have access to Object Oriented Perl. What sort of dangers are you referring to?

elbieelbieelbie


Comment on (elbie 2): What does this warning mean?
Re: (elbie 2): What does this warning mean?
by davorg (Chancellor) on Aug 17, 2001 at 19:03 UTC

    In the Cookbook, it's page 446 "A Warning on Indirect Object Notation" and in OOP it's pp98-101 "Another way to call a constructor".

    To summarise, there are two problems with it:

    1. The classname in method CLASS must be a bare symbol, a block or a scalar variable. It can't be just any old scalar expression. This can lead to surprising parsing.
    2. Perl needs to guess whether the method is, in fact, a method or a function. It can sometimes get this wrong. Particularly if your method has the same name as a function in your main package.

    In general it will work fine, but the times that it won't work are so difficult to keep a track of that it's best to never use it. There's no good reason not to use the alternative CLASS->method syntax, so I see it as a good habit to get into.

    --
    <http://www.dave.org.uk>

    Perl Training in the UK <http://www.iterative-software.com>

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