You invoke an anonymous sub with ->(). Your sub would be invoked with $new_resolvers{"dns-extern"}[0]->($ip_address). The way you have your loop written, you'll have to tell the difference between a scalar and a sub though. You could rewrite the loop as:
   print "getting new resolvers for dns server $dns_server\n";
   for my $resolver ( @{$new_resolvers{$dns_server}} ) {
     if (ref $resolver) {
       print "$_\n" for $resolver->($ip);
     } else {
       print "$resolver\n\n";
     }
   }
   print "\n";

[download]
I don't know where $ip is supposed to come from, but that's the way you have your anonymous sub written.

In reply to Re: How To Call An Anonymous Subroutine? by runrig
in thread How To Call An Anonymous Subroutine? by Plankton

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.