Hello fellow monks,

I have a situation in which I have a 3rd party module which exports some subroutines which I need to redefine (lets not delve into a discussion of why this is bad, etc.). Here is an example:

module.pm
package module;

use warnings;
use strict;

use base qw/Exporter/;
our @EXPORT = qw/function/;

sub function {
    print "old\n";
}

1;

[download]
redefine.pm
package redefine;

use warnings;
use strict;

no warnings qw/redefine/;
use module;
sub module::function {
    print "new\n";
}

1;

[download]

Now unless 'use redefine' preceeds _any_ 'use module' - everything works as expected. However if I do this:
use module;
use redefine;

function();

[download]
I still get 'old', because the symbol table is still referencing the first version of function().

Is there a way to truly redefine a subroutine, or the only way to do this right is to ensure redefine.pm is the very first one use()d in any circumstances?

Thanks

In reply to Exported subroutine redefine by ribasushi

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.