Just inherit properly, using the glob as the underlying data structure. The only thing you'll have to pay attention to is how you access and set your data: 

package My::FTP;
use base 'Net::FTP';

sub new {
# my($class,$host,%args) = @_;
  my $self = Net::FTP::new(@_) or die $@;
  ${*$self}{_custom_data} = 'CUSTOM DATA';
  return $self;
}

sub custom {
  my $self = shift;
  return ${*$self}{_custom_data},"\n";
}

package main;
my $ftp = My::FTP->new(shift);
$ftp->login(shift,shift) or die $ftp->message;
print $ftp->pwd,$/;
print $ftp->custom,$/;
print ref $ftp,$/;

__END__
/
CUSTOM DATA
My::FTP

[download]

Hope this helps.

In reply to Re: Inheritance confusion by Thelonious
in thread Inheritance confusion by the_slycer

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.