How you make use of your utility class is somewhat interesting though. The naïve approach can lead to problems down the road when you make a subclass and it needs to have a slightly different version of some or all of the methods provided by the utility class.

Here's a naïve implementation: 

package Foo;
use UtilityClass;

sub some_method {
    my $self = shift;
    $self->UtilityClass::some_method(@_);
}

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Nothing wrong with that, is there? Well... yes, because stuff is hardcoded, you may find that, when you come to subclass foo, things will break. A better approach is: 
package Foo;
use UtilityClass;

sub helper_class { 'UtilityClass' };

sub some_method {
    goto &{ $_[0]->helper_class->can('some_method') };
}

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You could go further and add per object customization, by turning 'helper_class' into an instance method, allowing you to choose which utility class to use on an object by object basis rather than class by class...

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

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