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From Torsten Förtsch <torsten.foert...@gmx.net>
Subject Re: Getting a / when regex should produce nothing
Date Tue, 27 Apr 2010 09:25:33 GMT
On Tuesday 27 April 2010 10:18:17 Michael Ludwig wrote:

> A lexical variable in Perl is any variable declared with "my", regardless
>  of the scope, which may be file-level. Unlike globals, lexical variables
>  aren't directly accessible from outside the package.

Not quite correct. Consider this:

$ perl -Mstrict -le '
  my $x=10;
  our $y=20;
  {
    package hugo;

    print "x=$x";   # references $x outside of package hugo
    print "y=$y";   # references $main::y
    ($x,$y)=(1,2);
  }
  print "x=$x";
  print "y=$y"
'
x=10
y=20
x=1
y=2

$x is file-level lexical. It is visible all over the file. The embedded 
package hugo has no influence. Lexical variables are not bound to a package 
but to a lexical scope.

Same with our-variables. C<our> declares the visibility of a variable in the 
current lexical scope.

> You can read up about this issue here:
> 
> http://perl.apache.org/docs/general/perl_reference/perl_reference.html

Or for German speakers, there was a series of articles about scoping in $foo-
magazin:

  http://foo-magazin.de/

Torsten Förtsch

-- 
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