smullis has asked for the wisdom of the Perl Monks concerning the following question:

Hi All,

It's been years since I posted here... I've been away with the fairies in Python and Ruby land for so long I've forgotten almost everything I ever knew about Perl OO...

I have no doubt that the following question is extremely basic..

I want to extend a class for a Perl API with one additional method.

I have the method but I don't want to edit the core API files. I would like to simply add the method in my script.

So, to test this: filename: SPEAK/
package SPEAK::ITALIAN; use strict; use warnings; use Exporter; use vars qw(@ISA @EXPORT); @ISA = qw( Exporter ); @EXPORT = qw(hello); use constant HELLO => "Hello"; use constant GOODBYE => "Goodbye"; sub hello { print HELLO . " in Italiano\n"; } return 1;

Now, in my script (in this case "") I simply want to add a method to the SPEAK::ITALIAN class with all constants and other good stuff in the correct namespaces and so on

#!/usr/bin/perl use strict; use warnings; use SPEAK::ITALIAN; sub goodbye{ print GOODBYE . " in Italiano\n"; } hello(); goodbye();
Running this gives:
Hello in Italiano! GOODBYE in Italiano!

As you've noticed, GOODBYE is incorrect. It's not picking up the constant from the SPEAK::ITALIAN module.

I know I'm missing something very basic. Do I need "use base qw(SPEAK::ITALIAN)"?

Any pointers?

Thanks in advance and apologies for the awfulness of the question...