The problem there is that you've hardwired the Utility class's name into your class. Suppose you want to subclass Foo to use a different UtilityClass (or a subclass of it), with the hardwiring you have in place you have to override all the methods that make calls to the utility class.

At the very least you should wrap the Utility classname in a method, so your code becomes: 

package Foo;
use UtilityClass;

sub helper { 'UtilityClass' }

sub bubbles {
   ...
   $self->helper->buttercup();
   ...
}

[download]
Et voila! you'll only have to change the utility class name at two points in your subclass; no need to override.

Actually, I wonder if you couldn't use the Exporter to implement something like a ruby mixin. 

package UtilityClass;

use base 'Exporter';

@EXPORT = qw/buttercup/;

sub buttercup {
   my $self = shift; # $self is *not* a 'UtilityClass';
   ...
}

[download]
You know, I'm not sure whether that's a good idea, or a barking mad one...

In reply to Re: Re: Re: Re: Re: OOP - Sharing class methods by pdcawley
in thread OOP - Sharing class methods by mp

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