When you use our you're accessing package variables without having to explicitly name them. That is, when you write:
package Foo;
our $var;
$var = 10;

[download]
you're actually setting the $Foo::var. The our declaration is lexically scoped. The following example could be of some use:
package Foo;
our $d;               # FIRST
$d = __PACKAGE__;

package Bar;
sub bar {
   print 'in ', __PACKAGE__, '::bar $d is equal to ', "$d\n";
   return;
}
our $d = __PACKAGE__; # SECOND
sub baz {
   print 'in ', __PACKAGE__, '::baz $d is equal to ', "$d\n";
   return;
}

package main;
Bar::bar();
Bar::baz();

__END__

poletti@PolettiX:~/sviluppo/perl$ perl our.pl
in Bar::bar $d is equal to Foo
in Bar::baz $d is equal to Bar

[download]
Bar::bar() "sees" the FIRST declaration, while 
Bar::baz()> is in the scope of the second.
<p>In your example, you actually access <c>$Bar::d

[download]
in the anonymous sub you pass to Foo::top(): the fact that it has the same value of $Foo::d depends on the assignment:
   our($d) = @_;

[download]
which makes $Bar::d equal to $Foo::d - ach! :)

Flavio
perl -ple'$_=reverse' <<<ti.xittelop@oivalf

Don't fool yourself.

In reply to Re: 'Our' limits? by polettix
in thread 'Our' limits? by cedar

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.