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Well, without reading the explanation for the warning, I would expect ()(BBB)() or (AAA)(BBB)(AAA) or just ()()() like the case of no parameters.

It seems that sub f (the second one) compiles in runtime, and internal $a is not asigned the first time it is called, but when called from g, it glues the first value it receives.

Let me show an improved example:

#!perl use v5.10; use strict; use warnings; my $a = shift; sub f { say "global f ($a)"; } f(); sub g { my ($a) = @_; say "global g ($a)"; sub f { say "local f ($a)"; # line 17 } f(); } f(); g(shift); say "main1 $a"; $a = shift; say "main2 $a"; f(); g(shift); f(); __END__ C:\Temp>localsub.pl AAA BBB CCC DDD Variable "$a" will not stay shared at C:\Temp\localsub.pl line 17. Subroutine f redefined at C:\Temp\localsub.pl line 16. Use of uninitialized value $a in concatenation (.) or string at C:\Tem +p\localsub.pl line 17. local f () Use of uninitialized value $a in concatenation (.) or string at C:\Tem +p\localsub.pl line 17. local f () global g (BBB) local f (BBB) main1 AAA main2 CCC local f (BBB) global g (DDD) local f (BBB) local f (BBB)

As you can see, the internal variable is empty (uninitialized) the first two times f is called, but as soon as it is defined, it keeps that value forever. Weird...


In reply to Re^3: closure clarity, please by vitoco
in thread closure clarity, please by 7stud

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