At 07:32 AM 3/1/01, Jonny Cavell wrote:
>I thought that by being declared inside [- -], the subroutine would be
>recompiled on every request, thus losing any reference to @fields.
>
>Jonny
I don't think it recompiles anything unless mtime has changed.
Turn on dbgShowCleanup to see for sure...
-mp
>J>-----Original Message-----
>J>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
>J>Sent: Wednesday, February 28, 2001 10:37 PM
>J>To: [EMAIL PROTECTED]
>J>Subject: Re: problem with subroutines caching values of variables
>J>
>J>
>J>On Wed, Feb 28, 2001 at 06:08:43PM -0000, Jonny Cavell wrote:
>J>> [-
>J>> my @fields = qw(a b);
>J>> print OUT "@fields";
>J>> sub testingit{
>J>> print OUT "@fields";
>J>> }
>J>> -]
>J>>
>J>> The first print gives the correct value ("a,b")
>J>> The second print gives an incorrect answer occasionally -
>J>seemingly an old
>J>> version of the variable.
>J>
>J>if i understand things correctly:
>J>
>J>embperl cleans up the variables used in each page by undef'ing them
>J>after the page has executed.
>J>
>J>your sub keeps a reference to @fields, and it continues to use the
>J>original @fields, even when the "real" @fields has been undef'ed and
>J>recreated. this is actually a feature of perl (see "Private Variables
>J>via my()" in perlsub(1p) and anything talking about "closures").
>J>
>J>> Interestingly, if I declare @fields in [$ var $] the
>J>problem does not seem
>J>> to occur.
>J>
>J>i'm guessing that embperl doesn't undef variables in this case (?), so
>J>both the function and new users of the variable are actually accessing
>J>the same thing.
>J>
>J>
>J>so:
>J>
>J>you can't do anything about it, except:
>J>
>J>1. avoid that construct. if you have to use variables local to the
>J>page, you should be using %mdat anyway.
>J>
>J>2. use [$var$] declarations, since they seem to work.
>J>
>J>--
>J> - Gus
>J>
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>
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