in reply to Lexical scope variable is not undef'ed

The pad entry for $var is cleared by a directive placed on the stack by my at run-time. Since you never execute the my at run-time, the directive is never created, so $var is never cleared.

The "trick" relies on undocumented internal implementation details, thus its use is discouraged. If you wish to create a "static" variable, then use 

{
   my $var; 
   sub func {
      ...
   }
}

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(Outer curlies optional.)

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Re^2: Lexical scope variable is not undef'ed
by grinder (Bishop) on Oct 22, 2007 at 17:46 UTC

    And the code to do this in 5.10 will be

    sub func {
    state $var;
}

    [download]

    but I know you know I knew you knew this already :)

    • another intruder with the mooring in the heart of the Perl

[reply]
[d/l]
      I didn't know, which also means you didn't know I know you knew I knew this already. :)
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