SPUG: Scope question

[dancerboy]

<geriatric coder pontification>

Yes, you should consider this an opportunity to rethink your coding 
style and perhaps learn better coding techniques.  As any experienced 
programmer should be able to tell you, global variable are a Bad 
Thing.  Many languages (e.g. Java) don't even have globals.

Your modules really ought to be entirely self-contained: any 
information that the modules need you should be passed in 
*explicitly*.  With the exception of language extensions/pragmas, a 
module should *never* need to peek into a client's namespace in order 
to do its thing.

</geriatric coder pontification>

-jason



At 4:39 pm -0700 2002-06-11, Parr, Ryan wrote:
>Peter,
>
>If you fully qualify the var then it is available. But this isn't any
>different from my understanding of standard module scope. Be careful when
>using global vars from mod_perl though, since the variables will not be
>reset when the request is complete. Also, if you modify the values of your
>global vars at runtime then all of your httpd children will end up with
>different values, which can really bite you. With mod_perl I've found it's
>best to just always use 'my'.
>
>But if you really want to share globals check out
>http://theoryx5.uwinnipeg.ca/cgi-bin/guide-filter?page=perl/Using_Global_Var
>iables_and_Shari.html;query=global;match=and;where=all;stem=no.
>
>-- Ryan Parr
>
>Common sense is the collection of prejudices acquired by age eighteen.
>		-- Albert Einstein
>
>
>-----Original Message-----
>From: Peter Darley [mailto:pdarley at kinesis-cem.com]
>Sent: Tuesday, June 11, 2002 3:00 PM
>To: SPUG
>Subject: SPUG: Scope question
>
>
>Friends,
>	I have a scope question.  I'm using mod_perl with apache, and it
>seems like in my main script (the one that the URL points to) when I do 'use
>vars qw($Thing1 %Thing2)' $Thing1 and %Thing2 are not available to functions
>in modules called from the main script.  Is this just an illusion and I have
>some other problem, or is this the way things work?  If so, is there some
>way I can share a variable with modules being used by a script? Thanks,
>Peter Darley
>
>
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